IEC 61754-4:2022

Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 4: Type SC connector family

IEC 61754-4:2021 specifies the standard interface dimensions for type SC family of connectors. This third edition cancels and replaces the second edition published in 2013 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- the test method IEC 61300-3-22 for the compression force of the ferrule was added;
- Annex A (informative) with cut out dimension requirements for testing the strength of mounted adaptors was added.

Dispositifs d’interconnexion et composants passifs fibroniques - Interfaces de connecteurs fibroniques - Partie 4: Famille de connecteurs de type SC

L'IEC 61754-4:2022 spécifie les dimensions d'interfaces normalisées pour la famille de connecteurs de type SC. La présente troisième édition annule et remplace la deuxième édition publiée en 2013, et constitue une révision technique. La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout de la méthode d'essai de l'IEC 61300-3-22 sur la force de compression de la férule;
- ajout de l'Annexe A (informative) avec les exigences relatives aux dimensions des découpes pour réaliser les essais de résistance des raccords montés.

General Information

• Status: Published
• Publication Date: 27-Feb-2022
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Current Stage: PPUB - Publication issued
• Start Date: 28-Feb-2022
• Completion Date: 11-Mar-2022

Relations

• Revises: IEC 61754-4:2013/COR1:2014 - Corrigendum 1 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 4: Type SC connector family
• Effective Date: 05-Sep-2023
• Revises: IEC 61754-4:2013 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 4: Type SC connector family
• Effective Date: 05-Sep-2023

Overview

IEC 61754-4:2022 defines the standard mechanical interface dimensions for the SC (Subscriber Connector) family of fibre‑optic connectors. This third edition (2022) replaces the 2013 edition and provides the dimensional, interface and receptacle definitions needed to achieve mechanical intermateability and correct optical datum positioning for single‑ and multi‑position SC connectors.

Key updates in this edition:

• Addition of the ferrule compression force test method reference (IEC 61300-3-22).
• Introduction of Annex A (informative) with panel / cut‑out dimension requirements for strength testing of mounted adaptors.

Key topics and technical requirements

• Interface definitions: Standard interfaces for SC connectors are specified for simplex and duplex forms, including both physical contact (PC) and angled‑PC (APC) variants, and for active device receptacles.
• Mechanical features: The standard documents the push‑pull plug geometry, single male key orientation, spring‑loaded ferrule (2.5 mm nominal ferrule diameter) and resilient sleeve alignment mechanism used across the SC family.
• Receptacles and adaptors: Dimensional requirements for simplex/duplex adaptors and active device receptacles are included so that connectors locate repeatably and maintain the optical datum within the housing.
• Test and measurement: The standard references relevant normative documents, notably IEC 61300-3-22 for ferrule compression force, and includes informative guidance (Annex A) on panel cut‑outs used when testing adaptor strength.
• Documentation: Multiple figures and tables (interfaces, intermateability, connector/adaptor/receptacle dimensions, alignment feature grades and mechanical stop grades) are provided to support design, inspection and verification.

Applications and who uses this standard

IEC 61754-4 is essential for professionals involved in:

• Connector and adaptor manufacturers - for product design, tooling and QA to ensure intermateability of SC plugs, adaptors and receptacles.
• Network equipment and active device OEMs - to design device receptacles that accept standard SC connectors and maintain optical alignment.
• Test laboratories and compliance engineers - to perform mechanical verification and ferrule compression testing referenced by IEC 61300‑3‑22.
• System integrators, data centre designers, and installers - to specify compatible components for telecom, datacom, FTTH and enterprise fibre infrastructure.
• Procurement and standards officers - to reference a recognized international interface standard when sourcing components to ensure interoperability.

Related standards

• IEC 61754-1 - General and guidance for fibre optic connector interfaces
• IEC 61755-3-1 / IEC 61755-3-2 - Optical ferrule interface standards (2.5 mm / 1.25 mm)
• IEC 61300-3-22 - Basic test: ferrule compression force

IEC 61754-4:2022 is a practical reference for designers and testers focused on mechanical compatibility and reliable optical alignment of SC family connectors in passive and active fibre‑optic equipment.

Standards Content (Sample)

IEC 61754-4 ®
Edition 3.0 2022-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces –
Part 4: Type SC connector family

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IEC 61754-4 ®
Edition 3.0 2022-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces –
Part 4: Type SC connector family
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.20 ISBN 978-2-8322-5121-8

– 2 – IEC 61754-4:2022 RLV © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Description . 6
5 Interfaces . 7
Annex A (informative) Panel dimensions . 37
A.1 General . 37
A.2 Simplex adaptor . 37
A.3 Duplex adaptor . 37
Bibliography . 39

Figure 1 – Simplex PC plug connector interface . 8
Figure 2 – Simplex adaptor connector interface . 11
Figure 3 – Pin gauge for adaptor . 13
Figure 4 – Duplex PC plug connector interface . 14
Figure 5 – Duplex adaptor connector interface . 17
Figure 6 – Simplex APC angled PC plug connector interface . 19
Figure 7 – Duplex APC angled PC plug connector interface . 22
Figure 8 – Simplex active device receptacle interface for APC angled PC connector
plug . 25
Figure 9 – Simplex active device receptacle interface for PC connector plug . 28
Figure 10 – Duplex active device receptacle interface for APC angled PC connector
plug . 31
Figure 11 – Duplex active device receptacle interface for PC connector plug . 34
Figure A.1 – Panel cut out . 37
Figure A.2 – Fixture cut out . 37

Table 1 – Interfaces . 7
Table 2 – Intermateability of interfaces . 7
Table 3 – Dimensions of the simplex PC plug connector interface . 9
Table 4 – Grade characteristics for simplex PC plug connector . 10
Table 5 – Dimensions of the simplex adaptor connector interface . 12
Table 6 – Grade characteristics for simplex adaptor connector . 12
Table 7 – Pin gauge dimensions . 13
Table 8 – Dimensions of the duplex PC plug connector interface . 15
Table 9 – Grade characteristics for duplex PC plug connector . 16
Table 10 – Dimensions of the duplex adaptor connector interface . 18
Table 11 – Grade of the duplex adaptor connector . 18
Table 12 – Dimensions of the simplex APC angled PC plug connector interfaces . 20
Table 13 – Dimensions of the duplex APC angled PC plug connector interfaces . 21

Table 14 – Dimensions of the simplex active device receptacle interface for APC
angled PC connector plug . 26
Table 15 – Alignment feature grade of the simplex active device
receptacle interface for angled PC connector plug . 27
Table 16 – Mechanical stop feature grade of the simplex active
device receptacle interface for angled PC connector plug . 27
Table 17 – Dimensions of the simplex active device receptacle interface for PC
connector plug . 29
Table 18 – Alignment feature grade of the simplex active device
receptacle interface for PC connector plug . 30
Table 19 – Mechanical stop feature grade of the simplex active
device receptacle interface for PC connector plug. 30
Table 20 – Dimensions of the duplex active device receptacle interface for APC angled
PC connector plug . 32
Table 21 – Alignment feature grade of the duplex active device
receptacle interface for angled PC connector plug . 33
Table 22 – Mechanical stop feature grade of the duplex active
device receptacle interface for angled PC connector plug . 33
Table 23 – Dimensions of the duplex active device receptacle interface for PC
connector plug . 35
Table 24 – Alignment feature grade of the duplex active device
receptacle interface for PC connector plug . 36
Table 25 – Mechanical stop feature grade of the duplex active
device receptacle interface for PC connector plug. 36
Table A.1 – Dimensions for simplex adaptor . 37
Table A.2 – Dimensions for duplex adaptor . 38

– 4 – IEC 61754-4:2022 RLV © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes made to
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IEC 61754-4 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and
passive components, of IEC technical committee 86: Fibre optics. It is an International Standard.
This third edition cancels and replaces the second edition published in 2013 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the test method IEC 61300-3-22 for the compression force of the ferrule was added;
b) Annex A (informative) with cut out dimension requirements for testing the strength of
mounted adaptors was added.
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/4563/FDIS 86B/4584/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts of the IEC 61754 series, under the general title Fibre optic interconnecting
devices and passive components – Fibre optic connector interfaces, can be found on the IEC
website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

– 6 – IEC 61754-4:2022 RLV © IEC 2022
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

1 Scope
This part of IEC 61754 defines specifies the standard interface dimensions for type SC family
of connectors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61755-3-1, Fibre optic connector optical interfaces – Part 3-1:Optical interface, 2,5 mm and
1,25 mm diameter cylindrical full zirconia PC ferrule, single mode fibre
IEC 61755-3-2, Fibre optic connector optical interfaces – Part 3-2: Optical interface, 2,5 mm
and 1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode
fibres
IEC 61300-3-22, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-22: Examinations and measurements – Ferrule compression
force
IEC 61754-1, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 1: General and guidance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61754-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Description
The parent connector for the type SC connector family is a single position plug connector
characterized by a 2,5 mm nominal ferrule diameter. It includes a push-pull coupling mechanism
which is spring loaded relative to the ferrule in the direction of the optical axis. The plug has a
single male key which may be used to orient and limit the relative position between the
connector and the component to which it is mated. The optical alignment mechanism of the
connector is of a resilient sleeve style.

This document defines the standard interface dimensions of active device receptacles for the
type SC connectors. The receptacles are used to retain the connector plug and mechanically
maintain the optical datum target of the plugs at a defined position within the receptacle
housings.
5 Interfaces
This document contains the standard interfaces showed in Table 1.
Table 1 – Interfaces
Interface IEC 61754-4-1 Simplex plug connector interface – push/pull, physical contact (PC)
Interface IEC 61754-4-2 Simplex adaptor connector interface – push/pull
Interface IEC 61754-4-3 Duplex plug connector interface – push/pull, PC
Interface IEC 61754-4-4 Duplex adaptor connector interface – push/pull
Interface IEC 61754-4-5 Simplex plug connector interface – push/pull, angled PC (APC) 8°
Interface IEC 61754-4-6 Duplex plug connector interface – push/pull, APC 8°
Interface IEC 61754-4-X1 Simplex active device receptacle interface – for APC 8°connector plug
Interface IEC 61754-4-X2 Simplex active device receptacle interface – for PC connector plug
Interface IEC 61754-4-X3 Duplex active device receptacle interface – for APC 8°connector plug
Interface IEC 61754-4-X4 Duplex active device receptacle interface – for PC connector plug

The plug of interface IEC 61754-4-1 and interface IEC 61754-4-3 has a ferrule with a spherically
polished endface (PC). The plug of interface IEC 61754-4-5 and interface IEC 61754-4-6 has a
ferrule with a spherically polished angled endface which may take any of the angled PC (APC)
forms and realizes a physical contact.
Table 2 shows the intermateability of interfaces.
Table 2 – Intermateability of interfaces
Adaptors/active device receptacles
Plugs
61754-4-2 61754-4-4 61754-4-X1 61754-4-X2 61754-4-X3 61754-4-X4
61754-4-1 Mate Mate Not mate Mate Not mate Mate
61754-4-3 Not mate Mate Not mate Not mate Not mate Mate
61754-4-5 Mate Mate Mate Not mate Mate Not mate
61754-4-8 61754-4-6 Not mate Mate Not mate Not mate Mate Not mate

Figure 1 is an example of a simplex PC plug connector interface. Table 3 gives dimensions of
the simplex PC plug connector interface and Table 4 gives the grade characteristics for simplex
PC plug connector interface.
A chamfer or radius is allowed to a maximum depth of 1,2 1,8 mm from the ferrule endface.

– 8 – IEC 61754-4:2022 RLV © IEC 2022

Figure 1 – Simplex PC plug connector interface

Table 3 – Dimensions of the simplex PC plug connector interface
Reference Dimensions Remarks
Minimum Maximum
A               2,500 mm
See Table 4
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F Angle, unit in degrees
19° 23°
G Angle, unit in degrees
25° 35°
a
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
b
L 2,11 mm –
b c
M 2,0 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
P 8,89 mm 8,99 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,90 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
b
V 0 mm 0,5 mm
BC 0° 0,5° 45° chamfer
d
BF 5 mm 30 mm Radius,
e
BG 0,8 mm – Diameter
BC 0 mm 0,5 mm Chamfer or round
d
BF See IEC 61755-3-1
Radius
BG See IEC 61755-3-1 Diameter
BI 25° 35° Angle, unit in degrees
a
Dimension H is given for plug endface when not mated. It The ferrule is movable by a certain axial compression
force, with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according
to IEC 61300-3-22.
b
Coupling sleeve shall be movable toward right and left direction. These dimensions are given when the coupling
sleeve is moved in its most right-direction position. The delatch housing shall be movable to the right or left.
Dimensions L, M and V are given when the delatch housing is at the furthest right. Dimension M shall be
negative, when the delatch housing is at the furthest left.
c
Dimension M shall be below 0 mm, when a coupling sleeve is moved to its most left-direction position. The right
end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest left.
d
Dome eccentricity of the spherical polished endface shall be less than 70 50 μm.
e
See IEC 61755-3-1.
– 10 – IEC 61754-4:2022 RLV © IEC 2022
Table 4 – Grade characteristics for simplex PC plug connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A See IEC 61755-3-1
a
B See IEC 61755-3-1
a
C See IEC 61755-3-1
a
D See IEC 61755-3-1
b
Am 2,497 2,500
b
Bm 2,497 2,500
b
Cm 2,494 2,500
a b
A      Grade not specified at this

m
time
a b
B 2,497 2,500
m
a b
C 2,494 2,500
m
a
See IEC 61755-3-1. Add the grade number to the interface reference number.
b 1
Refer to future IEC 61755-6-1 for guidance .

Figure 2 is an example of a simplex adaptor connector interface. Table 5 gives dimensions of
the simplex adaptor connector interface and Table 6 gives the grade of the simplex adaptor
connector interface.
___________
Under preparation. Stage at the time of publication: IEC/CDM 61755-6-1:2021.

Figure 2 – Simplex adaptor connector interface

– 12 – IEC 61754-4:2022 RLV © IEC 2022
Table 5 – Dimensions of the simplex adaptor connector interface
Dimensions
Reference Remarks
Minimum Maximum
A See Table 6
B 4,69 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle, unit in degrees
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
AI 2,7 mm 2,8 mm
a
BA 5,4 mm 5,6 mm
a
BB 10,8 mm 11,2 mm
a
It may be of a structure as shown by an alternate long and short dash line shown in Figure 2. The dotted line
structure in Figure 2 is a groove-shape preventing interference when the latch is deformed. It is optional.

Table 6 – Grade characteristics for simplex adaptor connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a a b
Resilient sleeve
a
Add the grade number to the interface reference number.
b
The connector alignment feature is a resilient sleeve. The feature shall accept a pin
gauge shown in Figure 3 to the centre of the adaptor with a force of 2 N to 5,9 N under
the condition that another pin gauge is inserted into the feature from the other side.
The centre of the adaptor is defined by the right side position of dimension H.

Figure 3 is an example of a pin gauge for adaptor. Table 7 gives pin gauge dimensions.

Figure 3 – Pin gauge for adaptor
Table 7 – Pin gauge dimensions
Dimensions
Reference mm
Remarks
Minimum Maximum
CK 2,498 5 2,499 5 Surface roughness:
grade N4 (0,2 μm radius)
CL 2,8 4,8
CN 7 15
Figure 4 is an example of a duplex PC plug connector interface. Table 8 gives dimensions of
the duplex PC plug connector interface and Table 9 gives the grade of the duplex PC plug
connector interface.
A chamfer or radius is allowed to a maximum depth of 1,2 1,8 mm from the ferrule endface.

– 14 – IEC 61754-4:2022 RLV © IEC 2022

Figure 4 – Duplex PC plug connector interface

Table 8 – Dimensions of the duplex PC plug connector interface
Dimensions
Reference Remarks
Minimum Maximum
A             2,500 mm
See Table 9
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F Angle, unit in degrees
19° 23°
G Angle, unit in degrees
25° 35°
a
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
b
L 2,11 mm –
b c
M 2,0 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
d
P 8,79 mm 8,89 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
b
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Degree chamfer Chamfer or round
DD 7 –
f
BF 5 mm 30 mm Radius,
g
BG – – Diameter
BI 25° 35°
f
BF See IEC 61755-3-1
Radius
BG See IEC 61755-3-1 Diameter
BI Angle, unit in degrees
25° 35°
e
DB 12,65 mm 12,75 mm
DD 7 mm 35 mm
– 16 – IEC 61754-4:2022 RLV © IEC 2022
a
Dimension H is given for plug endface when not mated. It The ferrule is movable by a certain axial compression
force, with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according
to IEC 61300-3-22.
b
The delatch housing shall be movable towards right and left direction to the right or left. Dimensions L, M and V
are given when the delatch housing is moved in its extreme right-direction position at the furthest right.
c
Dimension M shall be below 0 mm, when the delatch housing is moved to its most left-direction position. The
right end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest left.
d
The delatch housing may be a rigid sleeve. When two simplex plugs are retained together by a flexible sleeve,
dimension P shall be from 8,89 mm to 8,99 mm.
e
The delatch housing may be a rigid sleeve. When two simplex plugs are retained together by a flexible sleeve,
dimension DB shall be from 12,25 mm to 13,15 mm.
f
The dome eccentricity of the spherical polished endface shall be less than 70 50 μm.
g
See IEC 61755-3-1.
Table 9 – Grade characteristics for duplex PC plug connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A See IEC 61755-3-1
a
B See IEC 61755-3-1
a
C See IEC 61755-3-1
a
D See IEC 61755-3-1
b
Am 2,497 2,500
b
Bm 2,497 2,500
a b
A Grade not specified at this time
m
a b
B 2,497         2,500
m
a b
C 2,494         2,500
m
a
See IEC 61755-3-1. Add the grade number to the interface reference number.
b
Refer to future IEC 61755-6-1 for guidance.

Figure 5 is an example of a duplex adaptor connector interface. Table 10 gives dimensions of
the duplex adaptor connector interface and Table 11 gives the grade of the duplex adaptor
connector interface.
Figure 5 – Duplex adaptor connector interface

– 18 – IEC 61754-4:2022 RLV © IEC 2022
Table 10 – Dimensions of the duplex adaptor connector interface
Dimensions
Reference mm Remarks
Minimum Maximum
A See Table 11
B 4,39 mm 4,69 mm
D 4,9 mm 5,5 mm
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle, unit in degrees
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
AI 2,7 mm 2,8 mm
a
BA 5,4 mm 5,6 mm
a
BB 10,8 mm 11,2 mm
DB 12,65 mm 12,75 mm
DD – 6,99 mm
a
It may be of a structure as shown by a dash line in Figure 5. The dotted line structure in Figure 5 is a groove-
shape preventing interference when the latch is deformed. It is optional.

Table 11 – Grade of the duplex adaptor connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a a b
– –
Resilient sleeve
a
Add grade number to the interface reference number.
b
The connector alignment feature is a resilient sleeve. The feature shall accept a pin
gauge shown in Figure 3 to the centre of the adaptor with a force of 2,0 N to 5,9 N under
the condition that another pin gauge is inserted into the feature from the other side. The
centre of the adaptor is defined by the right side position of dimension H.

Figure 6 is an example of a simplex APC angled PC plug connector interface. Table 12 gives
dimensions of the simplex APC angled PC plug connector interface. The detail dimensions of
optical interfaces for APC are defined in IEC 61755-3-2.

Figure 6 – Simplex APC angled PC plug connector interface (1 of 2)

– 20 – IEC 61754-4:2022 RLV © IEC 2022

Figure 6 – Simplex APC angled PC plug connector interface (2 of 2)
Table 12 – Dimensions of the simplex APC angled PC plug connector interfaces
Dimensions
Reference Remarks
Minimum Maximum
a
A              2,500 mm

See IEC 61755-3-2
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F Angle, unit in degrees
19° 23°
G Angle, unit in degrees
25° 35°
b
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
c
L 2,11 mm –
c d
M 2,0 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
P 8,89 mm 8,99 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
c
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Degree chamfer Chamfer or round
e
EA – –
a
Detail dimensions and the grade number of the ferrule is required in IEC 61755-3-2. Add the grade number to the
interface reference number.
b
Dimension H is given for plug endface when not mated. It is movable by a certain axial compression force, with direct
contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall be 7,8 N to 11,8 N when
dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according to IEC 61300-3-22.
c
The delatch housing shall be movable to the right and or left directions. Dimensions L, M and V are given when the
delatch housing is moved in its extreme right direction position at the furthest right.
d
Dimension M shall be below 0 mm, when the delatch housing is moved to its extreme left direction position. The right
end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest left.
e
Dimension EA is defined as an angle between two planes: one plane, plane A E, passes through the axis of the ferrule
and axis of symmetry of the key of the angled endface connector plug. The other plane, plane B F, passes through the
axis of the ferrule and the normal to the angled PC reference plane. Dimension EA shall be 90° as a basic dimension.

Figure 7 is an example of a duplex APC angled PC plug connector interface. Table 13 gives
dimensions of the duplex APC angled PC plug connector interface. The detail dimensions of
optical interfaces for APC are defined in IEC 61755-3-2.

– 22 – IEC 61754-4:2022 RLV © IEC 2022

Figure 7 – Duplex APC angled PC plug connector interface (1 of 2)

Figure 7 – Duplex APC angled PC plug connector interface (2 of 2)
Table 13 – Dimensions of the duplex APC angled PC plug connector interfaces
Dimensions
Reference Remarks
Minimum Maximum
a
A                  2,500 mm

See IEC 61755-3-2
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F Angle, unit in degrees
19° 23°
G Angle, unit in degrees
25° 35°
b
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
c
L 2,11 mm –
c d
M 2 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
e
P 8,79 mm 8,89 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
c
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Degree chamfer Chamfer or round
f
DB
– 24 – IEC 61754-4:2022 RLV © IEC 2022
Dimensions
Reference Remarks
Minimum Maximum
DD 7,0 mm
g
EA – –
a
Detail dimensions and the grade number of the ferrule is required in IEC 61755-3-2. Add the grade number to the
interface reference number.
b
Dimension H is given for plug endface when not mated. It The ferrule is movable by a certain axial compression force,
with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall be 7,8 N to
11,8 N when dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according to IEC 61300-3-
22.
c
The delatch housing shall be movable to the right and or left directions. Dimensions L, M and V are given when the
delatch housing is moved in its extreme right direction position at the furthest right.
d
Dimension M shall be below 0 mm, when the delatch housing is moved to its extreme left direction position. The right
end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest left.
e
The delatch housing may be rigid sleeve. When two simplex plugs are retained together by a flexible sleeve,
dimension P shall be from 8,89 mm to 8,99 mm.
f
When two simplex plugs are retained together by a flexible sleeve, dimension DB shall be from 12,25 mm to 13,15
mm.
g
Dimension EA is defined as an angle between two planes: one plane, plane A D, passes through the axis of the ferrule
and axis of symmetry of the key of the angled endface connector plug. The other plane, plane B E, passes through
the axis of the ferrule and the normal to the angled PC reference plane. Dimension EA shall be 90° as a basic
dimension.
Figure 8 is an example of a simplex active device receptacle interface for angled PC connector
plug. Table 14 gives dimensions of the simplex active device receptacle interface for angled PC
connector plug.
Table 15 and Table 16 give alignment feature grade and mechanical stop feature grade for the
simplex active device receptacle interface for angled PC connector plug.

Figure 8 – Simplex active device receptacle interface for APC angled PC connector plug

– 26 – IEC 61754-4:2022 RLV © IEC 2022
Table 14 – Dimensions of the simplex active device receptacle
interface for APC angled PC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A See Table 15
B 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,2 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA Angle, unit in degrees
27° 33°
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
B b
BB 11,0 mm 11,2 mm
a
OA See Table 16
Radius
OC 0 mm 0,05 mm Radius
a
OD See Table 16
a
An example of a mechanical stop feature is shown in Figure 8. A mechanical stop feature is required in
IEC 61755-3-2 within the clearances specified in Table 15 depending upon the application to position the fibre
ferrule to maintain the optical datum target within the active device receptacle and to avoid damaging the
component within the receptacle.
b
This may be a structure as shown by a dashed line shown in Figure 8. The dotted line structure in Figure 8 is a
groove-shape preventing interference when the latch is deformed. It is optional.

Table 15 – Alignment feature grade of the simplex active device
receptacle interface for angled PC connector plug
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a b
1 2,500 2,502
a b
2 2,501 2,504
a b
3 2,501 2,510
a b
4 2,501 2,525
b c
5 – –
Resilient sleeve
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the interface reference number.
c
The connector alignment feature is a resilient sleeve. The feature accepts a pin gauge shown in Figure 3 to
the centre of the receptacle with a force of 2,9 N to 5,9 N. The centre of the receptacle is defined by the
right side position of dimension H. The measurement is performed using a single pin gauge.

Table 16 – Mechanical stop feature grade of the simplex active
device receptacle interface for angled PC connector plug
Dimensions Dimensions
mm μm
Grade Remarks
OA OA OD
minimum maximum clearance
a b
A 0,150 0,2 ±15
a b
B 0,150 0,35 ±40
a b
N 0,150 –
a b c
X
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the alignment feature grade number.
c
The connector alignment feature is a resilient sleeve.

Figure 9 is an example of a simplex active device receptacle interface for PC connector plug.
Table 17 gives dimensions of the simplex active device receptacle interface for PC connector
plug.
Table 18 and Table 19 give alignment feature grade and mechanical stop feature grade for
simplex active device receptacle interface for PC connector plug.

– 28 – IEC 61754-4:2022 RLV © IEC 2022

Figure 9 – Simplex active device receptacle interface for PC connector plug

Table 17 – Dimensions of the simplex active device
receptacle interface for PC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A See Table 18
B 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,2 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA Angle, unit in degrees
27° 33°
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
b
BB 11,0 mm 11,2 mm
a
OA See Table 19
Radius
OC 0 mm 0,15 mm Radius
a
OD See Table 19
a
An example of a mechanical stop feature is shown in Figure 9. A mechanical stop feature is required in
Table 3 within the clearances specified in Table 18 depending upon the application. A mechanical stop is required
to position the fibre ferrule to maintain the optical datum target within the active device receptacle and to avoid
damaging the component within the receptacle.
b
This may be a structure as shown by a dashed line shown in Figure 9. The dotted line structure in Figure 9 is a
groove-shape preventing interference when the latch is deformed. It is optional.

– 30 – IEC 61754-4:2022 RLV © IEC 2022
Table 18 – Alignment feature grade of the simplex active device
receptacle interface for PC connector plug
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a,b
1 2,500 2,502
a,b
2 2,501 2,504
a,b
3 2,501 2,510
a,b
4 2,501 2,525
b,c
5 – –
Resilient sleeve
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the interface reference number.
c
The connector alignment feature is a resilient sleeve. The feature accepts a pin gauge shown in Figure 3 to
the centre of the receptacle with a force of 2 N to 5,9 N. The centre of the receptacle is defined by the right
side position of dimension H.
Table 19 – Mechanical stop feature grade of the simplex active
device receptacle interface for PC connector plug
Dimensions Dimensions
mm μm
Grade Remarks
OA OA OD
minimum maximum clearance
a b
A 0,150 0,2 ±5
a b
B 0,150 0,35 ±10
a b
N 0,150 1,250
b c
X
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the alignment feature grade number.
c
The connector alignment feature is a resilient sleeve.

Figure 10 is an example of a duplex active device receptacle interface for angled PC connector
plug. Table 20 gives dimensions of the duplex active device receptacle interface for angled PC
connector plug.
Table 21 and Table 22 give alignment feature grade and mechanical stop feature grade for the
duplex active device receptacle interface for angled PC connector plug.

Figure 10 – Duplex active device receptacle interface for APC angled PC connector plug

– 32 – IEC 61754-4:2022 RLV © IEC 2022
Table 20 – Dimensions of the duplex active device receptacle
interface for APC angled PC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A See Table 21
B 4,39 mm 4,69 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA Angle, unit in degrees
27° 33°
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
b
BB 11,0 mm 11,2 mm
DB 12,65 mm 12,75 mm
DD – 6,99 mm
a
OA See Table 22
Radius
OC 0 mm 0,15 mm Radius
a
OD See Table 22
a
It may be a structure as shown by a dashed line shown in Figure 10. The dot
...

IEC 61754-4 ®
Edition 3.0 2022-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces –
Part 4: Type SC connector family

Dispositifs d’interconnexion et composants passifs fibroniques – Interfaces de
connecteurs fibroniques –
Partie 4: Famille de connecteurs de type SC

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IEC 61754-4 ®
Edition 3.0 2022-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic

connector interfaces –
Part 4: Type SC connector family

Dispositifs d’interconnexion et composants passifs fibroniques – Interfaces de

connecteurs fibroniques –
Partie 4: Famille de connecteurs de type SC

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-1077-6

– 2 – IEC 61754-4:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Description . 6
5 Interfaces . 7
Annex A (informative) Panel dimensions . 35
A.1 General . 35
A.2 Simplex adaptor . 35
A.3 Duplex adaptor . 35
Bibliography . 37

Figure 1 – Simplex PC plug connector interface . 8
Figure 2 – Simplex adaptor connector interface . 11
Figure 3 – Pin gauge for adaptor . 12
Figure 4 – Duplex PC plug connector interface . 13
Figure 5 – Duplex adaptor connector interface . 16
Figure 6 – Simplex angled PC plug connector interface . 18
Figure 7 – Duplex angled PC plug connector interface . 20
Figure 8 – Simplex active device receptacle interface for angled PC connector plug . 23
Figure 9 – Simplex active device receptacle interface for PC connector plug . 26
Figure 10 – Duplex active device receptacle interface for angled PC connector plug. 29
Figure 11 – Duplex active device receptacle interface for PC connector plug . 32
Figure A.1 – Panel cut out . 35
Figure A.2 – Fixture cut out . 35

Table 1 – Interfaces . 7
Table 2 – Intermateability of interfaces . 7
Table 3 – Dimensions of the simplex PC plug connector interface . 9
Table 4 – Grade characteristics for simplex PC plug connector . 10
Table 5 – Dimensions of the simplex adaptor connector interface . 11
Table 6 – Grade characteristics for simplex adaptor connector . 12
Table 7 – Pin gauge dimensions . 12
Table 8 – Dimensions of the duplex PC plug connector interface . 14
Table 9 – Grade characteristics for duplex PC plug connector . 15
Table 10 – Dimensions of the duplex adaptor connector interface . 17
Table 11 – Grade of the duplex adaptor connector . 17
Table 12 – Dimensions of the simplex angled PC plug connector interfaces . 19
Table 13 – Dimensions of the duplex angled PC plug connector interfaces . 21
Table 14 – Dimensions of the simplex active device receptacle interface for angled PC
connector plug . 24

Table 15 – Alignment feature grade of the simplex active device receptacle interface
for angled PC connector plug . 25
Table 16 – Mechanical stop feature grade of the simplex active device receptacle
interface for angled PC connector plug . 25
Table 17 – Dimensions of the simplex active device receptacle interface for PC
connector plug . 27
Table 18 – Alignment feature grade of the simplex active device receptacle interface
for PC connector plug . 28
Table 19 – Mechanical stop feature grade of the simplex active device receptacle
interface for PC connector plug . 28
Table 20 – Dimensions of the duplex active device receptacle interface for angled PC
connector plug . 30
Table 21 – Alignment feature grade of the duplex active device receptacle interface for
angled PC connector plug . 31
Table 22 – Mechanical stop feature grade of the duplex active device receptacle
interface for angled PC connector plug . 31
Table 23 – Dimensions of the duplex active device receptacle interface for PC
connector plug . 33
Table 24 – Alignment feature grade of the duplex active device receptacle interface for
PC connector plug . 34
Table 25 – Mechanical stop feature grade of the duplex active device receptacle
interface for PC connector plug . 34
Table A.1 – Dimensions for simplex adaptor . 35
Table A.2 – Dimensions for duplex adaptor . 36

– 4 – IEC 61754-4:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 61754-4 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and
passive components, of IEC technical committee 86: Fibre optics. It is an International Standard.
This third edition cancels and replaces the second edition published in 2013 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the test method IEC 61300-3-22 for the compression force of the ferrule was added;
b) Annex A (informative) with cut out dimension requirements for testing the strength of
mounted adaptors was added.
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/4563/FDIS 86B/4584/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts of the IEC 61754 series, under the general title Fibre optic interconnecting
devices and passive components – Fibre optic connector interfaces, can be found on the IEC
website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 61754-4:2022 © IEC 2022
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 4: Type SC connector family

1 Scope
This part of IEC 61754 specifies the standard interface dimensions for type SC family of
connectors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61300-3-22, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-22: Examinations and measurements – Ferrule compression
force
IEC 61754-1, Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces – Part 1: General and guidance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61754-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Description
The parent connector for the type SC connector family is a single position plug connector
characterized by a 2,5 mm nominal ferrule diameter. It includes a push-pull coupling mechanism
which is spring loaded relative to the ferrule in the direction of the optical axis. The plug has a
single male key which may be used to orient and limit the relative position between the
connector and the component to which it is mated. The optical alignment mechanism of the
connector is of a sleeve style.
This document defines the standard interface dimensions of active device receptacles for the
type SC connectors. The receptacles are used to retain the connector plug and mechanically
maintain the optical datum target of the plugs at a defined position within the receptacle
housings.
5 Interfaces
This document contains the standard interfaces showed in Table 1.
Table 1 – Interfaces
Interface IEC 61754-4-1 Simplex plug connector interface – push/pull, physical contact (PC)
Interface IEC 61754-4-2 Simplex adaptor connector interface – push/pull
Interface IEC 61754-4-3 Duplex plug connector interface – push/pull, PC
Interface IEC 61754-4-4 Duplex adaptor connector interface – push/pull
Interface IEC 61754-4-5 Simplex plug connector interface – push/pull, angled PC (APC) 8°
Interface IEC 61754-4-6 Duplex plug connector interface – push/pull, APC 8°
Interface IEC 61754-4-X1 Simplex active device receptacle interface – for APC 8°connector plug
Interface IEC 61754-4-X2 Simplex active device receptacle interface – for PC connector plug
Interface IEC 61754-4-X3 Duplex active device receptacle interface – for APC 8°connector plug
Interface IEC 61754-4-X4 Duplex active device receptacle interface – for PC connector plug

Table 2 shows the intermateability of interfaces.
Table 2 – Intermateability of interfaces
Adaptors/active device receptacles
Plugs
61754-4-2 61754-4-4 61754-4-X1 61754-4-X2 61754-4-X3 61754-4-X4
61754-4-1 Mate Mate Not mate Mate Not mate Mate
61754-4-3 Not mate Mate Not mate Not mate Not mate Mate
61754-4-5 Mate Mate Mate Not mate Mate Not mate
61754-4-6 Not mate Mate Not mate Not mate Mate Not mate

Figure 1 is an example of a simplex PC plug connector interface. Table 3 gives dimensions of
the simplex PC plug connector interface and Table 4 gives the grade characteristics for simplex
PC plug connector interface.
A chamfer or radius is allowed to a maximum depth of 1,8 mm from the ferrule endface.

– 8 – IEC 61754-4:2022 © IEC 2022

Figure 1 – Simplex PC plug connector interface

Table 3 – Dimensions of the simplex PC plug connector interface
Reference Dimensions Remarks
Minimum Maximum
A See Table 4
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19° 23° Angle, unit in degrees
G Angle, unit in degrees
25° 35°
a
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
b
L 2,11 mm –
b c
M 2,0 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
P 8,89 mm 8,99 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,90 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
b
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Chamfer or round
d
BF See IEC 61755-3-1
Radius
BG See IEC 61755-3-1 Diameter
BI Angle, unit in degrees
25° 35°
a
Dimension H is given for plug endface when not mated. The ferrule is movable by a certain axial compression
force, with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according
to IEC 61300-3-22.
b
The delatch housing shall be movable to the right or left. Dimensions L, M and V are given when the delatch
housing is at the furthest right. Dimension M shall be negative, when the delatch housing is at the furthest left.
c
The right end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest
left.
d
Dome eccentricity of the spherical polished endface shall be less than 50 μm.

– 10 – IEC 61754-4:2022 © IEC 2022
Table 4 – Grade characteristics for simplex PC plug connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A See IEC 61755-3-1
a
B See IEC 61755-3-1
a
C See IEC 61755-3-1
a
D See IEC 61755-3-1
a b
A Grade not specified at this time

m
a b
B 2,497 2,500
m
a b
C 2,494 2,500
m
a
Add the grade number to the interface reference number.
b 1
Refer to future IEC 61755-6-1 for guidance .

Figure 2 is an example of a simplex adaptor connector interface. Table 5 gives dimensions of
the simplex adaptor connector interface and Table 6 gives the grade of the simplex adaptor
connector interface.
___________
Under preparation. Stage at the time of publication: IEC/CDM 61755-6-1:2021.

Figure 2 – Simplex adaptor connector interface
Table 5 – Dimensions of the simplex adaptor connector interface
Dimensions
Reference Remarks
Minimum Maximum
A See Table 6
B 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA Angle, unit in degrees
27° 33°
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
– 12 – IEC 61754-4:2022 © IEC 2022
Dimensions
Reference Remarks
Minimum Maximum
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
AI 2,7 mm 2,8 mm
a
BA 5,4 mm 5,6 mm
a
BB 10,8 mm 11,2 mm
a
The dotted line structure in Figure 2 is a groove-shape preventing interference when the latch is deformed. It
is optional.
Table 6 – Grade characteristics for simplex adaptor connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a a b
Resilient sleeve
a
Add the grade number to the interface reference number.
b
The connector alignment feature is a resilient sleeve. The feature shall accept a pin
gauge shown in Figure 3 to the centre of the adaptor with a force of 2 N to 5,9 N under
the condition that another pin gauge is inserted into the feature from the other side.
The centre of the adaptor is defined by the right side position of dimension H.

Figure 3 is an example of a pin gauge for adaptor. Table 7 gives pin gauge dimensions.

Figure 3 – Pin gauge for adaptor
Table 7 – Pin gauge dimensions
Dimensions
Reference mm Remarks
Minimum Maximum
CK 2,498 5 2,499 5 Surface roughness:
grade N4 (0,2 μm radius)
CL 2,8 4,8
CN 7
Figure 4 is an example of a duplex PC plug connector interface. Table 8 gives dimensions of
the duplex PC plug connector interface and Table 9 gives the grade of the duplex PC plug
connector interface.
A chamfer or radius is allowed to a maximum depth of 1,8 mm from the ferrule endface.

Figure 4 – Duplex PC plug connector interface

– 14 – IEC 61754-4:2022 © IEC 2022
Table 8 – Dimensions of the duplex PC plug connector interface
Dimensions
Reference Remarks
Minimum Maximum
A See Table 9
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F Angle, unit in degrees
19° 23°
G Angle, unit in degrees
25° 35°
a
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
b
L 2,11 mm –
b c
M 2,0 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
d
P 8,79 mm 8,89 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
b
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Chamfer or round
f
BF See IEC 61755-3-1
Radius
BG See IEC 61755-3-1 Diameter
BI Angle, unit in degrees
25° 35°
e
DB 12,65 mm 12,75 mm
DD 7 mm 35 mm
a
Dimension H is given for plug endface when not mated. The ferrule is movable by a certain axial compression
force, with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according
to IEC 61300-3-22.
b
The delatch housing shall be movable to the right or left. Dimensions L, M and V are given when the delatch
housing is at the furthest right.
c
The right end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest
left.
d
The delatch housing may be a rigid sleeve. When two simplex plugs are retained together by a flexible sleeve,
dimension P shall be from 8,89 mm to 8,99 mm.
e
The delatch housing may be a rigid sleeve. When two simplex plugs are retained together by a flexible sleeve,
dimension DB shall be from 12,25 mm to 13,15 mm.
f
The dome eccentricity of the spherical polished endface shall be less than 50 μm.

Table 9 – Grade characteristics for duplex PC plug connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A See IEC 61755-3-1
a
B See IEC 61755-3-1
a
C See IEC 61755-3-1
a
D See IEC 61755-3-1
a b
A Grade not specified at this time

m
a b
B 2,497 2,500
m
a b
C 2,494 2,500
m
a
Add the grade number to the interface reference number.
b
Refer to future IEC 61755-6-1 for guidance.

Figure 5 is an example of a duplex adaptor connector interface. Table 10 gives dimensions of
the duplex adaptor connector interface and Table 11 gives the grade of the duplex adaptor
connector interface.
– 16 – IEC 61754-4:2022 © IEC 2022

Figure 5 – Duplex adaptor connector interface

Table 10 – Dimensions of the duplex adaptor connector interface
Dimensions
Reference mm Remarks
Minimum Maximum
A See Table 11
B 4,39 mm 4,69 mm
D 4,9 mm 5,5 mm
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA 27° 33° Angle, unit in degrees
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
AI 2,7 mm 2,8 mm
a
BA 5,4 mm 5,6 mm
a
BB 10,8 mm 11,2 mm
DB 12,65 mm 12,75 mm
DD – 6,99 mm
a
The dotted line structure in Figure 5 is a groove-shape preventing interference when the latch is deformed. It
is optional.
Table 11 – Grade of the duplex adaptor connector
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a a b
– –
Resilient sleeve
a
Add grade number to the interface reference number.
b
The connector alignment feature is a resilient sleeve. The feature shall accept a pin
gauge shown in Figure 3 to the centre of the adaptor with a force of 2,0 N to 5,9 N under
the condition that another pin gauge is inserted into the feature from the other side. The
centre of the adaptor is defined by the right side position of dimension H.

– 18 – IEC 61754-4:2022 © IEC 2022
Figure 6 is an example of a simplex angled PC plug connector interface. Table 12 gives
dimensions of the simplex angled PC plug connector interface. The detail dimensions of optical
interfaces for APC are defined in IEC 61755-3-2.

Figure 6 – Simplex angled PC plug connector interface (1 of 2)

Figure 6 – Simplex angled PC plug connector interface (2 of 2)
Table 12 – Dimensions of the simplex angled PC plug connector interfaces
Dimensions
Reference Remarks
Minimum Maximum
a
A See IEC 61755-3-2
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19° 23° Angle, unit in degrees
G Angle, unit in degrees
25° 35°
b
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
c
L 2,11 mm –
c d
M 2,0 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
P 8,89 mm 8,99 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
c
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Chamfer or round
e
EA – –
– 20 – IEC 61754-4:2022 © IEC 2022
a
Add the grade number to the interface reference number.
b
Dimension H is given for plug endface when not mated. It is movable by a certain axial compression force, with
direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall be 7,8 N to
11,8 N when dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according to
IEC 61300-3-22.
c
The delatch housing shall be movable to the right or left. Dimensions L, M and V are given when the delatch
housing is at the furthest right.
d
The right end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest
left.
e
Dimension EA is defined as an angle between two planes: one plane, plane E, passes through the axis of the
ferrule and axis of symmetry of the key of the angled endface connector plug. The other plane, plane F, passes
through the axis of the ferrule and the normal to the angled PC reference plane. Dimension EA shall be 90° as
a basic dimension.
Figure 7 is an example of a duplex angled PC plug connector interface. Table 13 gives
dimensions of the duplex angled PC plug connector interface. The detail dimensions of optical
interfaces for APC are defined in IEC 61755-3-2.

Figure 7 – Duplex angled PC plug connector interface (1 of 2)

Figure 7 – Duplex angled PC plug connector interface (2 of 2)
Table 13 – Dimensions of the duplex angled PC plug connector interfaces
Dimensions
Reference Remarks
Minimum Maximum
a
A See IEC 61755-3-2
B 4,8 mm 4,9 mm
C 6,8 mm 7,4 mm
D 4,9 mm 5,3 mm
E 6,7 mm 6,8 mm
F 19° 23° Angle, unit in degrees
G Angle, unit in degrees
25° 35°
b
H 7,15 mm 7,5 mm
I 0,8 mm 1,2 mm
J 5,3 mm 5,5 mm
K – 0,05 mm
c
L 2,11 mm –
c d
M 2 mm 2,8 mm
N 6,6 mm 6,8 mm
O 1,6 mm 1,8 mm
e
P 8,79 mm 8,89 mm
Q 0,8 mm 1,0 mm
R 7,29 mm 7,39 mm
S 0,8 mm 0,9 mm Radius
T 4,05 mm 4,15 mm
U 5,4 mm 5,6 mm
c
V 0 mm 0,5 mm
BC 0 mm 0,5 mm Chamfer or round
f
DB
DD 7,0 mm
– 22 – IEC 61754-4:2022 © IEC 2022
Dimensions
Reference Remarks
Minimum Maximum
g
EA – –
a
Add the grade number to the interface reference number.
b
Dimension H is given for plug endface when not mated. The ferrule is movable by a certain axial compression
force, with direct contacting endfaces, and therefore dimension H is variable. Ferrule compression force shall
be 7,8 N to 11,8 N when dimension H is 7,0 mm ± 0,1 mm. The compression force shall be measured according
to IEC 61300-3-22.
c
The delatch housing shall be movable to the right or left. Dimensions L, M and V are given when the delatch
housing is at the furthest right.
d
The right end of M shall be at the left of the mechanical datum target when the delatch housing is at the furthest
left.
e
The delatch housing may be rigid sleeve. When two simplex plugs are retained together by a flexible sleeve,
dimension P shall be from 8,89 mm to 8,99 mm.
f
When two simplex plugs are retained together by a flexible sleeve, dimension DB shall be from 12,25 mm
to 13,15 mm.
g
Dimension EA is defined as an angle between two planes: one plane, plane D, passes through the axis of the
ferrule and axis of symmetry of the key of the angled endface connector plug. The other plane, plane E, passes
through the axis of the ferrule and the normal to the angled PC reference plane. Dimension EA shall be 90° as
a basic dimension.
Figure 8 is an example of a simplex active device receptacle interface for angled PC connector
plug. Table 14 gives dimensions of the simplex active device receptacle interface for angled PC
connector plug.
Table 15 and Table 16 give alignment feature grade and mechanical stop feature grade for the
simplex active device receptacle interface for angled PC connector plug.

Figure 8 – Simplex active device receptacle interface for angled PC connector plug

– 24 – IEC 61754-4:2022 © IEC 2022
Table 14 – Dimensions of the simplex active device receptacle
interface for angled PC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A See Table 15
B 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA Angle, unit in degrees
27° 33°
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
b
BB 11,0 mm 11,2 mm
a
OA See Table 16
Radius
OC 0 mm 0,05 mm Radius
a
OD See Table 16
a
An example of a mechanical stop feature is shown in Figure 8. A mechanical stop is required to position the fibre
ferrule to maintain the optical datum target within the active device receptacle and to avoid damaging the
component within the receptacle.
b
The dotted line structure in Figure 8 is a groove-shape preventing interference when the latch is deformed. It is
optional.
Table 15 – Alignment feature grade of the simplex active device
receptacle interface for angled PC connector plug
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a b
1 2,500 2,502
a b
2 2,501 2,504
a b
3 2,501 2,510
a b
4 2,501 2,525
b c
5 – –
Resilient sleeve
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the interface reference number.
c
The connector alignment feature is a resilient sleeve. The feature accepts a pin gauge shown in Figure 3 to
the centre of the receptacle with a force of 2,9 N to 5,9 N. The centre of the receptacle is defined by the
right side position of dimension H. The measurement is performed using a single pin gauge.

Table 16 – Mechanical stop feature grade of the simplex active
device receptacle interface for angled PC connector plug
Dimensions Dimensions
mm μm
Grade Remarks
OA OA OD
minimum maximum clearance
a b
A 0,150 0,2 ±15
a b
B 0,150 0,35 ±40
a b
N 0,150 –
b c
X
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the alignment feature grade number.
c
The connector alignment feature is a resilient sleeve.

Figure 9 is an example of a simplex active device receptacle interface for PC connector plug.
Table 17 gives dimensions of the simplex active device receptacle interface for PC connector
plug.
Table 18 and Table 19 give alignment feature grade and mechanical stop feature grade for
simplex active device receptacle interface for PC connector plug.

– 26 – IEC 61754-4:2022 © IEC 2022

Figure 9 – Simplex active device receptacle interface for PC connector plug

Table 17 – Dimensions of the simplex active device
receptacle interface for PC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A See Table 18
B 4,39 mm 4,79 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,2 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA Angle, unit in degrees
27° 33°
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
b
BB 11,0 mm 11,2 mm
a
OA See Table 19
Radius
OC 0 mm 0,15 mm Radius
a
OD See Table 19
a
An example of a mechanical stop feature is shown in Figure 9. A mechanical stop is required to position the fibre
ferrule to maintain the optical datum target within the active device receptacle and to avoid damaging the component
within the receptacle.
b
The dotted line structure in Figure 9 is a groove-shape preventing interference when the latch is deformed. It is
optional.
– 28 – IEC 61754-4:2022 © IEC 2022
Table 18 – Alignment feature grade of the simplex active device
receptacle interface for PC connector plug
Dimensions
Grade A Remarks
Minimum Maximum
a,b
1 2,500 2,502
a,b
2 2,501 2,504
a,b
3 2,501 2,510
a,b
4 2,501 2,525
b,c
5 – –
Resilient sleeve
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the interface reference number.
c
The connector alignment feature is a resilient sleeve. The feature accepts a pin gauge shown in Figure 3 to
the centre of the receptacle with a force of 2 N to 5,9 N. The centre of the receptacle is defined by the right
side position of dimension H.
Table 19 – Mechanical stop feature grade of the simplex active
device receptacle interface for PC connector plug
Dimensions Dimensions
mm μm
Grade Remarks
OA OA OD
minimum maximum clearance
a b
A 0,150 0,2 ±5
a b
B 0,150 0,35 ±10
a b
N 0,150 1,250
b c
X
a
The connector alignment feature is a rigid bore.
b
Add the grade number to the alignment feature grade number.
c
The connector alignment feature is a resilient sleeve.

Figure 10 is an example of a duplex active device receptacle interface for angled PC connector
plug. Table 20 gives dimensions of the duplex active device receptacle interface for angled PC
connector plug.
Table 21 and Table 22 give alignment feature grade and mechanical stop feature grade for the
duplex active device receptacle interface for angled PC connector plug.

Figure 10 – Duplex active device receptacle interface for angled PC connector plug

– 30 – IEC 61754-4:2022 © IEC 2022
Table 20 – Dimensions of the duplex active device receptacle
interface for angled PC connector plug
Dimensions
Reference Remarks
Minimum Maximum
A See Table 21
B 4,39 mm 4,69 mm
D 4,9 mm 5,5 mm
a
H 6,9 mm 7,1 mm
I 0,4 mm 0,8 mm
J 5,51 mm 5,90 mm
K 0,06 mm 1,00 mm
L 1,9 mm 2,1 mm
O 2,0 mm 2,2 mm
P 9,0 mm 9,1 mm
R 7,4 mm 7,5 mm
S 1,0 mm 1,1 mm Radius
T 3,80 mm 4,04 mm
U 5,0 mm 5,3 mm
V 0,6 mm 1,6 mm
AA Angle, unit in degrees
27° 33°
AB 0,8 mm 1,0 mm
AC 0,4 mm 0,6 mm Radius
AD 0,7 mm 0,8 mm
AE 0,4 mm 0,6 mm
b
BA 5,4 mm 5,6 mm
b
BB 11,0 mm 11,2 mm
DB 12,65 mm 12,75 mm
DD – 6,99 mm
a
OA See Table 22
Radius
OC 0 mm 0,15 mm Radius
a
OD See Table 22
a
The dotted line structure in Figure 10 is a groove-shape preventing interference when the latch is deformed. It is
optional.
b
An example of a mechanical stop feature is shown in Figure 10. A mechanical stop is required to position the
fibre ferrule to maintain the optical datum target within the active device receptacle and to avoid damaging the
component within the receptacle.

Table 21 – Alignment feature grade of the duplex active device
receptacle interface for angled PC connector plug
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a b
1 2,500 2,502
a b
2 2,501 2,504
a b
3 2,501 2,510
a b
4 2,501 2,525
b c
5 – –
Resilient sleeve
a
The connector alignment feature is a
...