IEC 61754-6:2013

• Abstract:

  IEC 61754-6:2013 defines the standard interface dimensions for type MU family of connectors. This second edition cancels and replaces the first edition published in 1997 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:; - addition of standard references;; - revision of intermateability. Keywords: standard interface dimensions for type MU family of connectors

• Status: Published
• Publication Date: 21-Jul-2013
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Current Stage: DELPUB - Deleted Publication
• Start Date: 28-Feb-2022
• Completion Date: 28-Aug-2026

• Revises: IEC 61754-6:1997/AMD1:2001 - Amendment 1 - Fibre optic connector interfaces - Part 6: Type MU connector family
• Effective Date: 05-Sep-2023
• Revises: IEC 61754-6:1997/AMD2:2004 - Amendment 2 - Fibre optic connector interfaces - Part 6: Type MU connector family
• Effective Date: 05-Sep-2023
• Revises: IEC 61754-6:1997 - Fibre optic connector interfaces - Part 6: Type MU connector family
• Effective Date: 05-Sep-2023
• Revised: IEC 61754-6:2022 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 6: Type MU connector family
• Effective Date: 05-Sep-2023

Overview

IEC 61754-6:2013 specifies the standard interface dimensions for the type MU connector family used in fibre optic interconnecting devices and passive components. Edition 2.0 (2013) replaces the 1997 first edition and is a technical revision that adds normative references and updates intermateability rules. The publication provides the mechanical and interface definitions designers and manufacturers need to ensure consistent mating and physical compatibility across MU connector components.

Key Topics

• Scope and purpose: Defines dimensional interfaces for MU family plugs, adaptors and receptacles to guarantee mechanical intermateability.
• Connector variants covered: Simplex and duplex plugs, 4.5 mm and 6.25 mm duplex formats, 8‑port and horizontal duplex arrangements, APC variants, and floating 2‑port plug configurations.
• Mounting interfaces: Detailed interfaces for printed‑board housings, backplane housings, active device receptacles and sleeve holders.
• Alignment and mechanical features: Specification of alignment features, mechanical stops for rigid bore alignment, gauge pin interfaces and permissible grades/tolerances.
• Documentation elements: Extensive figures and dimension tables, annexes (MU‑A, MU‑B configurations), and normative references (including IEC 61755‑3‑1 and IEC 61755‑3‑2).
• Intermateability: Revised intermateability requirements to ensure reliable mating between compliant components from different suppliers.

Applications

IEC 61754-6 is used wherever MU family connectors are specified or implemented:

• Product design & manufacturing: Mechanical and optical connector suppliers use the standard to design housings, ferrule assemblies and adaptors that mate correctly.
• Equipment integration: Optical transceiver/module, patch panel, router/switch and active device designers use the interface dimensions for PCB and backplane mounting.
• Quality & test labs: Conformance testing and verification of dimensional compatibility rely on the tables, gauge definitions and grades in the standard.
• Procurement & specifications: Buyers and systems integrators reference IEC 61754-6 in procurement documents to ensure supplier components are interoperable.
• Telecom, data‑centre and datacom installations: Ensures reliable physical compatibility in high-density fibre deployments using MU connectors.

Benefits

• Enables cross‑vendor intermateability and reduces integration risk
• Provides clear mechanical tolerances and mounting definitions
• Simplifies specification writing, procurement and conformance testing

Related Standards

• IEC 61754 series (fibre optic connector interfaces)
• IEC 61755‑3‑1 and IEC 61755‑3‑2 (fibre optic connector optical interfaces for 2.5 mm and 1.25 mm ferrules)

Keywords: IEC 61754-6:2013, MU connector family, standard interface dimensions for type MU family of connectors, fibre optic connector interfaces, intermateability.

IEC 61754-6 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces –
Part 6: Type MU connector family

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IEC 61754-6 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components – Fibre optic

connector interfaces –
Part 6: Type MU connector family

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XC
ICS 33.180.20 ISBN 978-2-8322-1010-9

– 2 – 61754-6 © IEC:2013(E)
CONTENTS
FOREWORD . 5

1 Scope . 7

2 Normative references . 7

3 Description . 7

4 Interfaces . 7

Annex A (informative) Configuration of type MU-A connector set . 74

Annex B (informative) Configuration of type MU-B connector set . 75
Annex C (informative) Floating 2-port connector plug . 76
Bibliography . 77

Figure 1 – Simplex plug connector interface – Push/pull . 11
Figure 2 – 4,5 mm duplex plug connector interface – Push/pull . 14
Figure 3 – Simplex adaptor connector interface – Push/pull . 17
Figure 4 – Gauge pin for resilient alignment sleeve . 19
Figure 5 – 4,5 mm duplex adaptor connector interface – Push/pull . 20
Figure 6 – 8-port adaptor connector interface – Push/pull . 23
Figure 7 – Plug connector interface – For printed board housings . 25
Figure 8 – Sleeve holder interface . 27
Figure 9 – 2-port backplane housing interface. 30
Figure 10 – 2-port printed board housing interface . 34
Figure 11 – 8-port backplane housing interface . 37
Figure 12 – 8-port printed board housing interface . 41
Figure 13 – Simplex active device receptacle interface . 43
Figure 14 – Detail of the mechanical stop for rigid bore alignment feature. 45
Figure 15 – 4,5 mm duplex active device receptacle interface . 46
Figure 16 – Detail of the mechanical stop for rigid bore alignment feature. 48
Figure 17 – 6,25 mm duplex active device receptacle interface . 49
Figure 18 – Detail of the mechanical stop for rigid bore alignment feature. 51
Figure 19 – Plug connector interface for printed board housings, APC . 53

Figure 20 – Simplex plug connector interface – Push/pull, APC . 56
Figure 21 – 4,5 mm duplex plug connector interface – Push/pull, APC . 59
Figure 22 – 6,25 mm duplex plug connector interface – Push/pull, APC . 62
Figure 23 – 6,25 mm duplex plug connector interface – Push/pull . 64
Figure 24 – 6,25 mm duplex adaptor connector interface . 67
Figure 25 – Horizontal duplex plug connector interface – Push/pull . 69
Figure 26 – Horizontal duplex adaptor connector interface . 72
Figure A.1 – Configuration of type MU-A connector set . 74
Figure B.1 – Configuration of type MU-B connector set . 75
Figure C.1 – Floating 2-port connector plug . 76

Table 1 – MU-A connector set . 9

61754-6 © IEC:2013(E) – 3 –
Table 2 – MU-B connector set . 9

Table 3 – MU receptacles . 10

Table 4 – Dimensions of the simplex plug connector interface . 12

Table 5 – Grade . 13

Table 6 – Dimensions of the 4,5 mm duplex plug connector interface . 15

Table 7 – Grade . 16

Table 8 – Dimensions of the simplex adaptor connector interface . 18

Table 9 – Grade . 18

Table 10 – Gauge pin dimensions . 19
Table 11 – Dimensions of the 4,5 mm duplex adaptor connector interface . 21
Table 12 – Grade . 22
Table 13 – Dimensions of the 8-port adaptor connector interface . 24
Table 14 – Grade . 24
Table 15 – Dimensions of the plug connector interface . 26
Table 16 – Grade . 26
Table 17 – Dimensions of the sleeve holder interface . 28
Table 18 – Grade . 28
Table 19 – Dimensions of the 2-port backplane housing interface) . 31
Table 20 – Grade . 32
Table 21 – Dimensions of the 2-port printed board housing interface . 35
Table 22 – Dimensions of the 8-port backplane housing interface . 38
Table 23 – Grade . 39
Table 24 – Dimensions of the 8-port printed board housing interface . 42
Table 25 – Dimensions of the simplex active device receptacle interface . 44
Table 26 – Alignment feature grade . 45
Table 27 – Dimensions of the mechanical stop for rigid bore alignment feature . 45
Table 28 – Mechanical stop feature grade. 46
Table 29 – Dimensions of the 4,5 mm duplex active device receptacle interface . 47
Table 30 – Alignment feature grade . 48
Table 31 – Dimensions of the mechanical stop for rigid bore alignment feature . 48
Table 32 – Mechanical stop feature grade. 49

Table 33 – Dimensions of the 6,25 mm duplex active device receptacle interface . 50
Table 34 – Alignment feature grade . 51
Table 35 – Dimensions of the mechanical stop for rigid bore alignment feature . 51
Table 36 – Mechanical stop feature grade. 52
Table 37 – Dimensions of the plug connector interface for printed board housings, APC . 54
Table 38 – Dimensions of the simplex plug connector interfaces, APC . 57
Table 39 – Dimensions of the 4,5 mm duplex plug connector interfaces, APC . 60
Table 40 – Dimensions of the 6,25 mm duplex plug connector interface, APC. 63
Table 41 – Dimensions of the 6,25 mm duplex plug connector interface . 65
Table 42 – Grade . 66
Table 43 – Dimensions of the 6,25 mm duplex adaptor connector interface . 68
Table 44 – Grade . 68

– 4 – 61754-6 © IEC:2013(E)
Table 45 – Dimensions of the horizontal duplex plug connector interface . 70

Table 46 – Grade . 71

Table 47 – Dimensions of the horizontal duplex adaptor connector interface . 73

Table 48 – Grade . 73

Table C.1 – Dimensions table for 2-port connector plug . 76

61754-6 © IEC:2013(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

FIBRE OPTIC CONNECTOR INTERFACES –

Part 6: Type MU connector family

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61754-6 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 1997 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of standard references;
b) revision of intermateability.

– 6 – 61754-6 © IEC:2013(E)
The text of this standard is based on the following documents:

FDIS Report on voting
86B/3627/FDIS 86B/3662/RVD
Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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 publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

61754-6 © IEC:2013(E) – 7 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –

FIBRE OPTIC CONNECTOR INTERFACES –

Part 6: Type MU connector family

1 Scope
This part of IEC 61754 defines the standard interface dimensions for type MU family of
connectors.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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
3 Description
The parent connector for type MU connector family is a miniature single-position plug which is
characterized by a cylindrical, spring-loaded butting ferrule(s) of a 1,25 mm typical diameter,
and a push-pull coupling mechanism. The optical alignment mechanism of the connectors is
of a rigid hole or a resilient sleeve style.
This part 6 type MU connector family defines the standard interface dimensions of active
device receptacles for the type MU connectors. The receptacles are used to retain the
connector plugs and mechanically maintain the optical datum target of the plugs at a defined
position within the receptacle housings.

4 Interfaces
This standard contains the following standard interfaces.
Interface IEC 61754-6-1: Simplex plug connector interface – Push/pull (See Figure 1)
Interface IEC 61754-6-2: 4,5 mm duplex plug connector interface – Push/pull (See Figure 2)
Interface IEC 61754-6-3: Simplex adaptor connector interface – Push/pull (See Figure 3)
Interface IEC 61754-6-4: 4,5 mm duplex adaptor connector interface – Push/pull (see Figure 5)
Interface IEC 61754-6-5: 8-port adaptor connector interface – Push/pull (See Figure 6)
Interface IEC 61754-6-6: Plug connector interface – for printed board housings (See Figure 7)
Interface IEC 61754-6-7: Sleeve holder interface – for printed board housings (See Figure 8)
Interface IEC 61754-6-8: 2-port backplane housing interface – Self-retentive (See Figure 9)

– 8 – 61754-6 © IEC:2013(E)
Interface IEC 61754-6-9: 2-port printed board housing interface – Self-retentive (See Figure 10)

Interface IEC 61754-6-10: 8-port backplane housing interface – Self-retentive (See Figure 11)

Interface IEC 61754-6-11 8-port printed board housing interface – Self-retentive (See Figure 12)

Interface IEC 61754-6-12: Simplex active device receptacle interface – for PC connector plug

(See Figure 13)
Interface IEC 61754-6-13: 4,5 mm duplex active device receptacle interface – for PC connector

plug (See Figure 15)
Interface IEC 61754-6-14: 6,25 mm duplex active device receptacle interface – for PC connector

plug (See Figure 17)
Interface IEC 61754-6-15: Plug connector interface – for printed board housings, APC 8 degrees

(See Figure 19)
Interface IEC 61754-6-16: Simplex plug connector interface – Push/pull, APC 8 degrees
(See Figure 20)
Interface IEC 61754-6-17: 4,5 mm duplex plug connector interface – Push/pull, APC 8 degrees
(See Figure 21)
6,25 mm duplex plug connector interface – Push/pull, APC 8 degrees
Interface IEC 61754-6-18:
(See Figure 22)
Interface IEC 61754-6-19: 6,25 mm duplex plug connector interface – Push/pull (See Figure 23)
Interface IEC 61754-6-20: 6,25 mm duplex adaptor connector interface – Push/pull
(See Figure 24)
Interface IEC 61754-6-21: Horizontal duplex plug connector interface – Push/pull
(See Figure 25)
Interface IEC 61754-6-22: Horizontal duplex adaptor connector interface – Push/pull
(See Figure 26)
The plugs of interfaces IEC 61754-6-1, IEC 61754-6-2, IEC 61754-6-6, IEC 61754-6-19 and
IEC 61754-6-21 have a ferrule(s) with a spherically polished endface, and realize physical
contact (PC). The plugs of interfaces IEC 61754-6-15, IEC 61754-6-16, IEC 61754-6-17 and
IEC 61754-6-18 have a ferrule(s) with a spherically polished angled endface and realize
angled PC (APC).
The type MU connector family comprises two types of connector set: MU-A connector set (see
Annex A) and MU-B connector set (see Annex B). The MU-A connector set is a plug/adaptor
configuration with a push-pull coupling mechanism. The MU-B connector set is a plug-in type
back-plane connector configuration which is plug/backplane and printed board housings/plug
for printed board housing/sleeve holder configuration and is equipped with a self-retentive
mechanism.
The type MU-A connector set consists of simplex and duplex plugs, and simplex, duplex and

8-port adaptors. The plugs are common to the backplane connector housings of the type MU-
B connector set.
The type MU-B connector set consists of 2-port and 8-port backplane and printed board
connector housings, simplex and duplex plugs, plug for printed board connector housings,
and sleeve holder. The plug for printed board connector housing is used as a jack together
with the sleeve holder. The jack is attached into the printed board connector housing.
TableS 1, 2 and 3 show the intermateablitiy of the standard interfaces. It shall be noted
however that in order to obtain the designated optical performance, any plug shall be
connected to a counterpart plug whose ferrule end is polished to the same condition.

61754-6 © IEC:2013(E) – 9 –
Table 1 – MU-A connector set
Adaptors
Plugs
61754-6-3 61754-6-4 61754-6-5 61754-6-20 61754- 6-22

61754-6-1 Mate Mate Mate Mate Mate

61754-6-2 Not mate Mate Mate Not mate Not mate

61754-6-16 Mate Mate Mate Mate Mate

61754- 6-17 Not Mate Mate Mate Not Mate Not mate

61754-6-18 Not mate Not mate Not mate Mate Not mate
61754-6-19 Not mate Not mate Not mate Mate Not mate
61754-6-21 Not mate Not mate Not mate Not mate Mate

Table 2 – MU-B connector set
Connector housings
Plugs
Backplane connector housing Printed board connector housing
61754-6-8 61754-6-10 61754-6-9 61754-6-11
61754-6-1 Mate Mate Not mate Not mate
61754-6-2 Mate Mate Not mate Not mate
61754-6-6 with 61754-6-7
Not mate Not mate Mate Mate
61754-6-15 with 61754- 6-7
Not mate Not mate Mate Mate
61754-6-16 Mate Mate Not mate Not mate
61754-6-17 Mate Mate Not mate Not mate
61754-6-18 Not mate Not mate Not mate Not mate
61754-6-19 Not mate Not mate Not mate Not mate
61754-6-21 Not mate Not mate Not mate Not mate

– 10 – 61754-6 © IEC:2013(E)
Table 3 – MU receptacles
Receptacles
Plugs
61754-6-12 61754-6-13 61754-6-14

61754-6-1 Mate Mate Mate
61754-6-2 Not mate Mate Not mate

61754-6-16 Not mate Not mate Not mate

61754-6-17 Not mate Not mate Not mate

61754-6-18 Not mate Not mate Not mate
61754-6-19 Not mate Not mate Mate
61754-6-21 Not mate Not mate Not mate

Figure 1 is an example of a simplex plug connector interface. Table 4 gives dimensions of the
simplex plug connector interface and Table 5 gives the grade of the simplex plug connector
interface.
61754-6 © IEC:2013(E) – 11 –
Mechanical
datum target
Delatch housing
IEC  1860/13
Figure 1 – Simplex plug connector interface – Push/pull

– 12 – 61754-6 © IEC:2013(E)
Table 4 – Dimensions of the simplex plug connector interface

Dimensions
Reference Remarks
Minimum Maximum
a
A 1,249 5 mm , see Table 5
B 2,6 mm 2,7 mm
C 4,6 mm 4,8 mm
D 4,65 mm 4,75 mm
E 4,3 mm 4,4 mm
F 3,3 mm 3,4 mm
G 25° 35° Angle
H 25° 35° Angle
b
I 6,55 mm –
c
J 4,2 mm 4,5 mm
K 5,5 mm –
L 2,4 mm 2,5 mm
M 1,5 mm –
N 0,6 mm –
O 0,5 mm –
b
P 2,6 mm –
b d
Q 1 mm 1,1 mm and
b
R 2,65 mm 2,9 mm
S 5,5 mm 5,6 mm
T 4,3 mm 4,5 mm
U – 3,7 mm
V – 2,4 mm
W 6,5 mm 6,6 mm
AA 4,3 mm 4,4 mm
AB 3,85 mm 3,95 mm
AC 0,7 mm 0,9 mm
AD 0,2 mm – Radius
AE 3 mm –
AF 2,2 mm 2,3 mm
e
EA 32.5° 45° Angle,
f
EB 5 mm 30 mm Radius,
EC 0,45 mm 0,73 mm Diameter
a
A chamfer or radius is allowed to a maximum depth of 0,5 mm from the ferrule endface.
b
The delatch housing shall be movable toward the right and the left directions. These
dimensions are given when the coupling sleeve is moved in its most right-direction position.
c
The dimension J is given for the plug endface when not mated. It is noticed that the ferrule is
movable by a certain axial compression force with direct contacting endfaces, and therefore

the dimension J is variable. Ferrule compression force shall be 5,5 N to 6,5 N when the
position of the optical datum target from the mechanical datum target is moved in the range of
3,9 mm to 4,1 mm. In addition, the dimension J shall become less than 3,25 mm with a
relatively large axial compression force.
d
The right-side position of Q shall become the left-side position to the mechanical datum target
when the coupling sleeve is moved to its most left-direction position.
e
40° to 45° are desirable to minimize debris for backplane connectors.
f
Dome eccentricity of the spherically polished ferrule endface shall be less than 70 µm.

61754-6 © IEC:2013(E) – 13 –
Table 5 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 1,248 3 1,249 5
b
Bm 1.246 7 1,249 5
a
See IEC 61755-3-1
b
See IEC 61755-6-1.
Figure 2 is an example of a 4,5 mm duplex plug connector interface. Table 6 gives
dimensions of the 4,5 mm duplex plug connector interface e and Table 7 gives the grade of
the 4,5 mm duplex plug connector interface.

– 14 – 61754-6 © IEC:2013(E)
Mechanical
datum target
Delatch housing
IEC  1861/13
Figure 2 – 4,5 mm duplex plug connector interface – Push/pull

61754-6 © IEC:2013(E) – 15 –
Table 6 – Dimensions of the 4,5 mm duplex plug connector interface

Dimensions
Reference Remarks
Minimum Maximum
a
A 1,249 5 mm , see Table 7
B 2,6 mm 2,7 mm
C 4,6 mm 4,8 mm
D 4,65 mm 4,75 mm
E 4,3 mm 4,4 mm
F 3,3 mm 3,4 mm
G 25° 35° Angle
H 25° 35° Angle
\b
I 6,55 mm –
c
J 4,2 mm 4,5 mm
K 5,5 mm –
L 2,4 mm 2,5 mm
M 1,5 mm –
N 0,6 mm –
O 0,5 mm –
b
P 2,6 mm –
b d
Q 1,0 mm 1,1 mm and
b
R 2,65 mm 2,9 mm
S 5,5 mm 5,6 mm
T 4,3 mm 4,5 mm
U – 3,7 mm
V – 2,4 mm
W 6,5 mm 6,6 mm
AB 3,7 mm 3,85 mm
AC 0,7 mm 0,9 mm
AD 0,2 mm – Radius
AE 3,0 mm –
AF 2,2 mm 2,3 mm
AJ 8,8 mm 8,9 mm
AK 8,35 mm 8,45 mm
AL 4,55 mm 4,7 mm
AM 4,45 mm 4,55 mm
AP – 3,7 mm
e
EA 32.5° 45°
f
EB 5 mm 30 mm Radius
EC 0,45 mm 0,73 mm Diameter
a
A chamfer or radius is allowed to a maximum depth of 0,5 mm from the ferrule endface.
b
The delatch housing shall be movable toward the right and the left directions. These
dimensions are given when the coupling sleeve is moved in its most right-direction position.
c
The dimension J is given for the plug endface when not mated. It is noticed that the ferrule is
movable by a certain axial compression force with direct contacting endfaces, and therefore
the dimension J is variable. Ferrule compression force shall be 5,5 N to 6,5 N when the
position of the optical datum target from the mechanical datum target is moved in the range of
3,9 mm to 4,1 mm. In addition, the dimension J shall become less than 3,25 mm with a
relatively large axial compression force.
d
The right-side position of Q shall become left-side position to the mechanical datum target
when the coupling sleeve is moved to its most left-direction position.
e
40° to 45° are desirable to minimize debris for backplane connectors.
f
Dome eccentricity of the spherically polished ferrule endface shall be less than 70 µm.

– 16 – 61754-6 © IEC:2013(E)
Table 7 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 1,248 3 1,249 5
b
Bm 1,246 7 1,249 5
a
See IEC 61755-3-1.
b
See IEC 61755-6-1.
Figure 3 is an example of a simplex adaptor connector interface. Table 8 gives dimensions of
the simplex adaptor connector interface and Table 9 gives the grade of the simplex adaptor
connector interface.
61754-6 © IEC:2013(E) – 17 –
Mechanical
datum target
2× AJ
IEC  1862/13
Figure 3 – Simplex adaptor connector interface – Push/pull

– 18 – 61754-6 © IEC:2013(E)
Table 8 – Dimensions of the simplex adaptor connector interface

Dimensions
mm
Reference Remarks
Minimum Maximum
A  Diameter, see Table 9
B 2,39 2,59 Diameter
D 4,8 5
E 4,55 –
a
F 2,9 3,5
I – 6,5
J 3,9 4,1
K – 5,4
L 2,55 2,7
M – 1,4
N – 0,55
O – 0,6
P – 1,2
Q – 0,4
R – 2,55
S 5,65 5,75
U 3,8 4
V 3,3 –
W 6,7 –
AA 4,45 4,55
AB 4,01 4,11
AC 0,95 1,15
AD – 0,2 Radius
AE 2,8 2,95
AF 1,9 2,1
AG 0,3 – Radius
AH 0,4 0,55
AI 1,34 1,44 Diameter
AJ – 0,3 Radius
a
The dimension F shall become greater than 4,5 mm when a plug is coupled to or removed from
the adaptor.
Table 9 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
– – Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a
gauge pin to the centre of the adaptor with a force of 1 N to 2,5 N on condition that another
gauge pin is inserted into the feature from the other side. The centre of the adaptor is defined

by the right-side position of the dimension J. The gauge pin is shown in Figure 4 and Table 10.

61754-6 © IEC:2013(E) – 19 –
Figure 4 is an example of a gauge pin for resilient alignment sleeve. Table 10 gives gauge pin
dimensions.
LN
C or R
IEC  1863/13
Figure 4 – Gauge pin for resilient alignment sleeve

Table 10 – Gauge pin dimensions
Dimensions
mm
Reference Remarks
Minimum Maximum
LK 1,248 5 1,249 5 Surface roughness
grade N4
(0,2 µm radius)
LL 2,6 2,8
LN 4,7 9,5
Figure 5 is an example of a 4,5 mm duplex adaptor connector interface. Table 11 gives
dimensions of the 4,5 mm duplex adaptor connector interface and Table 12 gives the grade of the
4,5 mm duplex adaptor connector interface.

∅LK
∅LL
– 20 – 61754-6 © IEC:2013(E)
Mechanical
datum target
2× AJ
IEC  1864/13
Figure 5 – 4,5 mm duplex adaptor connector interface – Push/pull

61754-6 © IEC:2013(E) – 21 –
Table 11 – Dimensions of the 4,5 mm duplex adaptor connector interface

Dimensions
mm
Reference Remarks
Minimum Maximum
A  See Table 12
B 2,39 2,59
D 4,8 5
E 4,55 –
a
F 2,9 3,5
I – 6,5
J 3,9 4,1
K – 5,4
L 2,55 2,7
M – 1,4
N – 0,55
O – 0,6
P – 1,2
Q – 0,4
R – 2,55
S 5,65 5,75
U 3,8 4
V 3,3 –
W 6,7 –
AA 4,45 4,55
AB 4,01 4,11
AC 0,95 1,15
AD – 0,2 Radius
AE 2,8 2,95
AF 1,9 2,1
AG 0,3 – Radius
AH 0,4 0,55
AI 1,34 1,44 Diameter
AJ – 0,3 Radius
AM 4,45 4,55
AP 3,8 4
a
The dimension F shall become greater than 4,5 mm when a plug is coupled to or removed from
the adaptor.
– 22 – 61754-6 © IEC:2013(E)
Table 12 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
1  Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a

gauge pin to the centre of the adaptor with a force of 1 N to 2,5 N under the condition that
another gauge pin is inserted into the feature from the other side. The centre of the adaptor is

defined by the right-side position of the dimension J. The gauge pin is shown in Figure 4 and

Table 10.
Figure 6 is an example of an 8-port adaptor connector interface. Table 13 gives dimensions of
the 8-port adaptor connector interface and Table 14 gives the grade of the 8-port adaptor
connector interface.
61754-6 © IEC:2013(E) – 23 –
A
Mechanical
datum target
B
C
C
B
Detail of A Cross-section B-B
2× AJ
Cross-section C-C
IEC  1865/13
Figure 6 – 8-port adaptor connector interface – Push/pull

– 24 – 61754-6 © IEC:2013(E)
Table 13 – Dimensions of the 8-port adaptor connector interface

Dimensions
mm
Reference Remarks
Minimum Maximum
A  See Table 14
B 2,39 2,59
D 4,8 5
E 4,55 –
a
F 2,9 3,5
I – 6,5
J 3,9 4,1
K – 5,4
L 2,55 2,7
M – 1,4
N – 0,55
O – 0,6
P – 1,2
Q – 0,4
R – 2,55
S 5,65 5,75
U 3,8 4
V 3,3 –
W 6,7 –
AA 4,45 4,55
AB 4,01 4,11
AC 0,95 1,15
AD – 0,2 Radius
AE 2,8 2,95
AF 1,9 2,1
AG 0,3 – Radius
AH 0,4 0,55
AI 1,34 1,44 Diameter
AJ – 0,3 Radius
AM 4,45 4,55
AP 3,8 4
AQ 4,8 5,2
a
The dimension F shall become greater than 4,5 mm when a plug is coupled to or removed from
the adaptor.
Table 14 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
1  Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a
gauge pin to the centre of the adaptor with a force of 1 N to 2,5 N under the condition that
another gauge pin is inserted into the feature from the other side. The centre of the adaptor is
defined by the right-side position of the dimension J. The gauge pin is shown in Figure 4 and
Table 10.
Figure 7 is an example of a plug connector interface. Table 15 gives dimensions of the plug
connector interface and Table 16 gives the grade of the plug connector interface.

61754-6 © IEC:2013(E) – 25 –
Mechanical
X
datum target
Z
J
K L
AR
M
AS
N Optical datum
target
O
A
A
Ferrule
B
Y
Cross-section A-A
AV
Ferrule endface geometry Projected from B

IEC  1866/13
Figure 7 – Plug connector interface – For printed board housings

AU
D
A
B
F
E
AT
– 26 – 61754-6 © IEC:2013(E)
Table 15 – Dimensions of the plug connector interface

Dimensions
Reference Remarks
Minimum Maximum
a
A 1,249 5 mm See Table 16
B 2,6 mm 2,7 mm Diameter
D 4,65 mm 4,75 mm
E 4,3 mm 4,4 mm
F 3,3 mm 3,4 mm
b
J 4,2 mm 4,5 mm
K 5,5 mm –
L 2,4 mm 2,5 mm
M 1,5 mm –
N 0,6 mm –
O 0,5 mm –
AR 3,65 mm 3,75 mm
AS 2,9 mm 3,0 mm
AT 1,7 mm 2,1 mm
AU 43° 47°
AV – 3,0 mm
c
EA 32,5° 45°
d
EB 5 mm 30 mm Radius
EC 0,45 mm 0,73 mm
a
A chamfer or radius is allowed to a maximum depth of 0,5 mm from the ferrule endface.
b
The dimension J is given for the plug endface when not mated. It is noticed that the ferrule is
movable by a certain axial compression force with direct contacting endfaces, and therefore the
dimension J is variable. Ferrule compression force shall be 5,5 N to 6,5 N when the position of
the optical datum target from the mechanical datum target is moved in the range of 3,9 mm to
4,1 mm. In addition, the dimension J shall become less than 3,25 mm with a relatively large
axial compression force.
c
40° to 45° are desirable to minimize debris for backplane connectors.
d
Dome eccentricity of the spherically polished ferrule endface shall be less than 70 µm.

Table 16 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 1,248 3 1,249 5
b
Bm 1,246 7 1,249 5
a
See IEC 61755-3-1.
b
See IEC 61755-6-1.
61754-6 © IEC:2013(E) – 27 –
Figure 8 is an example of the sleeve holder interface. Table 17 gives dimensions of the sleeve
holder interface and Table 18 gives the grade of the sleeve holder interface.

Mechanical
datum target
IEC  1867/13
Figure 8 – Sleeve holder interface

– 28 – 61754-6 © IEC:2013(E)
Table 17 – Dimensions of the sleeve holder interface

Dimensions
mm
Reference Remarks
Minimum Maximum
A  See Table 18
B 2,54 2,59 Diameter
AI 1,34 1,39 Diameter
BA 4,65 4,85
BB 0,20 0,30
BC 3,65 3,85
BD 0,65 0,85
BE 2,9 3,1
BF – 0,25 45° chamfer
BG 3,5 3,54 Diameter
BH 3,1 3,2 Diameter
BI 2,5 2,7 Diameter
BJ 0,29 0,37
BK 2,49 2,59 Diameter
Table 18 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a
gauge pin to a depth of 4,3 mm from the left side with a force of 1 N to 2,5 N under the condition
that another gauge pin is inserted into the feature from the other side. The gauge pin is shown
in Figure 4 and Table 10.
Figure 9 is an example of the 2-port backplane housing interface. Table 19 gives dimensions
of the 2-port backplane housing interface and Table 20 gives the grade of the 2-port

backplane housing interface.
61754-6 © IEC:2013(E) – 29 –
B
A
Mechanical
datum target
Expanded view A
IEC  1868/13
Figure 9 (continued overleaf)
– 30 – 61754-6 © IEC:2013(E)
Mechanical
datum target
C
D
D
C
2× AJ
Expanded view B
Cross-section C-C
E
Expanded cross-section E
Cross-section D-D
IEC  1869/13
NOTE 1 In the cross-section C-C figure, the inner housing should be movable to the right by at least 0,9 mm, and
to the left by at least 2 mm when the inner latch is released.
NOTE 2 In the expanded cross-section E figure, the inner latch spring should be moved by more than 0,65 mm to
the right when the inner latch is released or latched.
Figure 9 – 2-port backplane housing interface

Mechanical
datum target
61754-6 © IEC:2013(E) – 31 –
Table 19 – Dimensions of the 2-port backplane housing interface (1 of 2)

Dimensions
Reference Remarks
Minimum Maximum
D 4,8 mm 5 mm
E 4,55 mm –
a
F 2,9 mm 3,5 mm
I – 6,5 mm
K – 5,4 mm
L 2,6 mm 2,7 mm
M – 1,4 mm
N – 0,6 mm
P – 1,2 mm
Q – 0,4 mm
R – 2,55 mm
S 5,65 mm 5,75 mm
W 6,7 mm –
AA 4,45 mm 4,55 mm
AB 4,01 mm 4,11 mm
AC 0,95 mm 1,15 mm
AD – 0,2 mm Radius
AE 2,8 mm 2,95 mm
AF 1,9 mm 2,1 mm
AG 0,3 mm – Radius
AH 0,4 mm 0,55 mm
AJ – 0.3 mm Radius
AM 4,45 mm 4,55 mm
AP 3,8 mm 4,0 mm
BM – – See Table 20
BN – – See Table 20
BO 12,25 mm 12,35 mm
BP 5,5 mm 5,7 mm
BQ 4,6 mm 4,7 mm
BR 11,2 mm 11,4 mm
BS 13,95 mm 14,05 mm
BT 16,2 mm 16,3 mm
b
BU 7,72 mm 7,78 mm
b
BV 1,1 mm 1,4 mm
BW 2,2 mm 2,6 mm
BX 1,95 mm 2,05 mm
BY 1,15 mm 1,25 mm
b
BZ 0,3 mm 0,4 mm
CA 0,725 mm 0,925 mm
CB 0,9 mm 1,1 mm
CC 35° 50° Angle
CD 8,1 mm 9,1 mm
CF 10,05 mm 10,35 mm
CG 8,1 mm 8,3 mm
CH 3,4 mm 3,6 mm Diameter
CI 1,17 mm 1,27 mm
CJ 1,7 mm 2,3 mm
CK 0,2 mm 0,3 mm
CL 0,3 mm 0,4 mm
CM 0,8 mm 1 mm
CN 0,55 mm 0,65 mm
CO 11,55 mm 11,65 mm
CP 9,95 mm 10,03 mm
– 32 – 61754-6 © IEC:2013(E)
Table 19 (2 of 2)
Dimensions Remarks
Reference
Minimum Maximum
CQ 7,92 mm 8 mm
CR 9,37 mm 9,43 mm
CS 0,55 mm 0,65 mm 45° chamfer
CT 0,55 mm 0,65 mm 45° chamfer

a
The dimension F shall become greater than 4,5 mm when a plug is coupled to or removed from
the backplane housing.
b
These dimensions are given when the inner housing is moved in its most left-side position under
the condition that the inner latch is completed.

Table 20 – Grade
Dimensions
mm
Grade Reference Remarks
Minimum Maximum
1 BM 6 6,2 Backplane thickness 2,4 mm
BN 2,65 2,75
2 BM 6 6,2 Backplane thickness 3,2 mm
BN 3,45 3,55
Figure 10 is an example of the 2-port printed board housing interface. Table 21 gives
dimensions of the 2-port printed board housing interface.

61754-6 © IEC:2013(E) – 33 –
Mechanical
A
datum target
B
IEC  1870/13
Figure 10 (continued overleaf)

– 34 – 61754-6 © IEC:2013(E)
D
C
C
D
Expanded view B
Expanded view A
Mechanical
datum target
Partial cross-section D-D
IEC  1871/13
Cross-section C-C
Figure 10 – 2-port printed board housing interface

61754-6 © IEC:2013(E) – 35 –
Table 21 – Dimensions of the 2-port printed board housing interface

Dimensions
Reference Remarks
Minimum Maximum
a
B 3,07 mm 3,15 mm Diameter
D 5 mm 5
...

IEC 61754-6 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic
connector interfaces –
Part 6: Type MU connector family

Dispositifs d’interconnexion et composants passifs à fibres optiques –
Interfaces de connecteurs pour fibres optiques –
Partie 6: Famille de connecteurs de type MU

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IEC 61754-6 ®
Edition 2.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Fibre optic

connector interfaces –
Part 6: Type MU connector family

Dispositifs d’interconnexion et composants passifs à fibres optiques –

Interfaces de connecteurs pour fibres optiques –

Partie 6: Famille de connecteurs de type MU

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-3436-5

– 2 – IEC 61754-6:2013 © IEC 2013
CONTENTS
FOREWORD. 5
1 Scope . 7
2 Normative references . 7
3 Description . 7
4 Interfaces . 7
Annex A (informative) Configuration of type MU-A connector set . 74
Annex B (informative) Configuration of type MU-B connector set . 75
Annex C (informative) Floating 2-port connector plug . 76
Bibliography . 77

Figure 1 – Simplex plug connector interface – Push/pull . 11
Figure 2 – 4,5 mm duplex plug connector interface – Push/pull . 14
Figure 3 – Simplex adaptor connector interface – Push/pull . 17
Figure 4 – Gauge pin for resilient alignment sleeve . 19
Figure 5 – 4,5 mm duplex adaptor connector interface – Push/pull . 20
Figure 6 – 8-port adaptor connector interface – Push/pull . 23
Figure 7 – Plug connector interface – For printed board housings . 25
Figure 8 – Sleeve holder interface . 27
Figure 9 – 2-port backplane housing interface . 30
Figure 10 – 2-port printed board housing interface . 34
Figure 11 – 8-port backplane housing interface . 37
Figure 12 – 8-port printed board housing interface . 41
Figure 13 – Simplex active device receptacle interface . 43
Figure 14 – Detail of the mechanical stop for rigid bore alignment feature . 45
Figure 15 – 4,5 mm duplex active device receptacle interface . 46
Figure 16 – Detail of the mechanical stop for rigid bore alignment feature . 48
Figure 17 – 6,25 mm duplex active device receptacle interface . 49
Figure 18 – Detail of the mechanical stop for rigid bore alignment feature . 51
Figure 19 – Plug connector interface for printed board housings, APC . 53
Figure 20 – Simplex plug connector interface – Push/pull, APC. 56
Figure 21 – 4,5 mm duplex plug connector interface – Push/pull, APC . 59
Figure 22 – 6,25 mm duplex plug connector interface – Push/pull, APC . 62
Figure 23 – 6,25 mm duplex plug connector interface – Push/pull . 64
Figure 24 – 6,25 mm duplex adaptor connector interface . 67
Figure 25 – Horizontal duplex plug connector interface – Push/pull . 69
Figure 26 – Horizontal duplex adaptor connector interface . 72
Figure A.1 – Configuration of type MU-A connector set . 74
Figure B.1 – Configuration of type MU-B connector set . 75
Figure C.1 – Floating 2-port connector plug . 76

Table 1 – MU-A connector set . 9

Table 2 – MU-B connector set . 9
Table 3 – MU receptacles . 10
Table 4 – Dimensions of the simplex plug connector interface . 12
Table 5 – Grade . 13
Table 6 – Dimensions of the 4,5 mm duplex plug connector interface . 15
Table 7 – Grade . 16
Table 8 – Dimensions of the simplex adaptor connector interface . 18
Table 9 – Grade . 18
Table 10 – Gauge pin dimensions . 19
Table 11 – Dimensions of the 4,5 mm duplex adaptor connector interface . 21
Table 12 – Grade . 22
Table 13 – Dimensions of the 8-port adaptor connector interface . 24
Table 14 – Grade . 24
Table 15 – Dimensions of the plug connector interface . 26
Table 16 – Grade . 26
Table 17 – Dimensions of the sleeve holder interface . 28
Table 18 – Grade . 28
Table 19 – Dimensions of the 2-port backplane housing interface) . 31
Table 20 – Grade . 32
Table 21 – Dimensions of the 2-port printed board housing interface . 35
Table 22 – Dimensions of the 8-port backplane housing interface . 38
Table 23 – Grade . 39
Table 24 – Dimensions of the 8-port printed board housing interface . 42
Table 25 – Dimensions of the simplex active device receptacle interface . 44
Table 26 – Alignment feature grade . 45
Table 27 – Dimensions of the mechanical stop for rigid bore alignment feature . 45
Table 28 – Mechanical stop feature grade . 46
Table 29 – Dimensions of the 4,5 mm duplex active device receptacle interface . 47
Table 30 – Alignment feature grade . 48
Table 31 – Dimensions of the mechanical stop for rigid bore alignment feature . 48
Table 32 – Mechanical stop feature grade . 49
Table 33 – Dimensions of the 6,25 mm duplex active device receptacle interface . 50
Table 34 – Alignment feature grade . 51
Table 35 – Dimensions of the mechanical stop for rigid bore alignment feature . 51
Table 36 – Mechanical stop feature grade . 52
Table 37 – Dimensions of the plug connector interface for printed board housings, APC . 54
Table 38 – Dimensions of the simplex plug connector interfaces, APC . 57
Table 39 – Dimensions of the 4,5 mm duplex plug connector interfaces, APC . 60
Table 40 – Dimensions of the 6,25 mm duplex plug connector interface, APC . 63
Table 41 – Dimensions of the 6,25 mm duplex plug connector interface . 65
Table 42 – Grade . 66
Table 43 – Dimensions of the 6,25 mm duplex adaptor connector interface . 68
Table 44 – Grade . 68

– 4 – IEC 61754-6:2013 © IEC 2013
Table 45 – Dimensions of the horizontal duplex plug connector interface . 70
Table 46 – Grade . 71
Table 47 – Dimensions of the horizontal duplex adaptor connector interface . 73
Table 48 – Grade . 73
Table C.1 – Dimensions table for 2-port connector plug . 76

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 6: Type MU connector family

FOREWORD
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International Standard IEC 61754-6 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 1997 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of standard references;
b) revision of intermateability.

– 6 – IEC 61754-6:2013 © IEC 2013
This bilingual version (2016-05) corresponds to the monolingual English version, published in
2013-07.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3627/FDIS 86B/3662/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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 publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
FIBRE OPTIC CONNECTOR INTERFACES –

Part 6: Type MU connector family

1 Scope
This part of IEC 61754 defines the standard interface dimensions for type MU family of
connectors.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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
3 Description
The parent connector for type MU connector family is a miniature single-position plug which is
characterized by a cylindrical, spring-loaded butting ferrule(s) of a 1,25 mm typical diameter,
and a push-pull coupling mechanism. The optical alignment mechanism of the connectors is
of a rigid hole or a resilient sleeve style.
This part 6 type MU connector family defines the standard interface dimensions of active
device receptacles for the type MU connectors. The receptacles are used to retain the
connector plugs and mechanically maintain the optical datum target of the plugs at a defined
position within the receptacle housings.
4 Interfaces
This standard contains the following standard interfaces.
Interface IEC 61754-6-1: Simplex plug connector interface – Push/pull (See Figure 1)
Interface IEC 61754-6-2: 4,5 mm duplex plug connector interface – Push/pull (See Figure 2)
Interface IEC 61754-6-3: Simplex adaptor connector interface – Push/pull (See Figure 3)
Interface IEC 61754-6-4: 4,5 mm duplex adaptor connector interface – Push/pull (see Figure 5)
Interface IEC 61754-6-5: 8-port adaptor connector interface – Push/pull (See Figure 6)
Interface IEC 61754-6-6: Plug connector interface – for printed board housings (See Figure 7)
Interface IEC 61754-6-7: Sleeve holder interface – for printed board housings (See Figure 8)
Interface IEC 61754-6-8: 2-port backplane housing interface – Self-retentive (See Figure 9)

– 8 – IEC 61754-6:2013 © IEC 2013
Interface IEC 61754-6-9: 2-port printed board housing interface – Self-retentive (See Figure 10)
Interface IEC 61754-6-10: 8-port backplane housing interface – Self-retentive (See Figure 11)
Interface IEC 61754-6-11 8-port printed board housing interface – Self-retentive (See Figure 12)
Interface IEC 61754-6-12: Simplex active device receptacle interface – for PC connector plug
(See Figure 13)
Interface IEC 61754-6-13: 4,5 mm duplex active device receptacle interface – for PC connector
plug (See Figure 15)
Interface IEC 61754-6-14: 6,25 mm duplex active device receptacle interface – for PC connector
plug (See Figure 17)
Interface IEC 61754-6-15: Plug connector interface – for printed board housings, APC 8 degrees
(See Figure 19)
Interface IEC 61754-6-16: Simplex plug connector interface – Push/pull, APC 8 degrees
(See Figure 20)
Interface IEC 61754-6-17: 4,5 mm duplex plug connector interface – Push/pull, APC 8 degrees
(See Figure 21)
Interface IEC 61754-6-18: 6,25 mm duplex plug connector interface – Push/pull, APC 8 degrees
(See Figure 22)
Interface IEC 61754-6-19: 6,25 mm duplex plug connector interface – Push/pull (See Figure 23)
Interface IEC 61754-6-20: 6,25 mm duplex adaptor connector interface – Push/pull
(See Figure 24)
Interface IEC 61754-6-21: Horizontal duplex plug connector interface – Push/pull
(See Figure 25)
Interface IEC 61754-6-22: Horizontal duplex adaptor connector interface – Push/pull
(See Figure 26)
The plugs of interfaces IEC 61754-6-1, IEC 61754-6-2, IEC 61754-6-6, IEC 61754-6-19 and
IEC 61754-6-21 have a ferrule(s) with a spherically polished endface, and realize physical
contact (PC). The plugs of interfaces IEC 61754-6-15, IEC 61754-6-16, IEC 61754-6-17 and
IEC 61754-6-18 have a ferrule(s) with a spherically polished angled endface and realize
angled PC (APC).
The type MU connector family comprises two types of connector set: MU-A connector set (see
Annex A) and MU-B connector set (see Annex B). The MU-A connector set is a plug/adaptor
configuration with a push-pull coupling mechanism. The MU-B connector set is a plug-in type
back-plane connector configuration which is plug/backplane and printed board housings/plug
for printed board housing/sleeve holder configuration and is equipped with a self-retentive
mechanism.
The type MU-A connector set consists of simplex and duplex plugs, and simplex, duplex and
8-port adaptors. The plugs are common to the backplane connector housings of the type MU-
B connector set.
The type MU-B connector set consists of 2-port and 8-port backplane and printed board
connector housings, simplex and duplex plugs, plug for printed board connector housings,
and sleeve holder. The plug for printed board connector housing is used as a jack together
with the sleeve holder. The jack is attached into the printed board connector housing.
TableS 1, 2 and 3 show the intermateablitiy of the standard interfaces. It shall be noted
however that in order to obtain the designated optical performance, any plug shall be
connected to a counterpart plug whose ferrule end is polished to the same condition.

Table 1 – MU-A connector set
Adaptors
Plugs
61754-6-3 61754-6-4 61754-6-5 61754-6-20 61754- 6-22
61754-6-1 Mate Mate Mate Mate Mate
61754-6-2 Not mate Mate Mate Not mate Not mate
61754-6-16 Mate Mate Mate Mate Mate
61754- 6-17 Not Mate Mate Mate Not Mate Not mate
61754-6-18 Not mate Not mate Not mate Mate Not mate
61754-6-19 Not mate Not mate Not mate Mate Not mate
61754-6-21 Not mate Not mate Not mate Not mate Mate

Table 2 – MU-B connector set
Connector housings
Plugs
Backplane connector housing Printed board connector housing
61754-6-8 61754-6-10 61754-6-9 61754-6-11
61754-6-1 Mate Mate Not mate Not mate
61754-6-2 Mate Mate Not mate Not mate
61754-6-6 with 61754-6-7
Not mate Not mate Mate Mate
61754-6-15 with 61754- 6-7
Not mate Not mate Mate Mate
61754-6-16 Mate Mate Not mate Not mate
61754-6-17 Mate Mate Not mate Not mate
61754-6-18 Not mate Not mate Not mate Not mate
61754-6-19 Not mate Not mate Not mate Not mate
61754-6-21 Not mate Not mate Not mate Not mate

– 10 – IEC 61754-6:2013 © IEC 2013
Table 3 – MU receptacles
Receptacles
Plugs
61754-6-12 61754-6-13 61754-6-14
61754-6-1 Mate Mate Mate
61754-6-2 Not mate Mate Not mate
61754-6-16 Not mate Not mate Not mate
61754-6-17 Not mate Not mate Not mate
61754-6-18 Not mate Not mate Not mate
61754-6-19 Not mate Not mate Mate
61754-6-21 Not mate Not mate Not mate

Figure 1 is an example of a simplex plug connector interface. Table 4 gives dimensions of the
simplex plug connector interface and Table 5 gives the grade of the simplex plug connector
interface.
Mechanical
datum target
Delatch housing
IEC  1860/13
Figure 1 – Simplex plug connector interface – Push/pull

– 12 – IEC 61754-6:2013 © IEC 2013
Table 4 – Dimensions of the simplex plug connector interface
Dimensions
Reference Remarks
Minimum Maximum
a
A 1,249 5 mm , see Table 5
B 2,6 mm 2,7 mm
C 4,6 mm 4,8 mm
D 4,65 mm 4,75 mm
E 4,3 mm 4,4 mm
F 3,3 mm 3,4 mm
G 25° 35° Angle
H 25° 35° Angle
b
I 6,55 mm –
c
J 4,2 mm 4,5 mm
K 5,5 mm –
L 2,4 mm 2,5 mm
M 1,5 mm –
N 0,6 mm –
O 0,5 mm –
b
P 2,6 mm –
b d
Q 1 mm 1,1 mm and
b
R 2,65 mm 2,9 mm
S 5,5 mm 5,6 mm
T 4,3 mm 4,5 mm
U – 3,7 mm
V – 2,4 mm
W 6,5 mm 6,6 mm
AA 4,3 mm 4,4 mm
AB 3,85 mm 3,95 mm
AC 0,7 mm 0,9 mm
AD 0,2 mm – Radius
AE 3 mm –
AF 2,2 mm 2,3 mm
e
EA 32.5° 45° Angle,
f
EB 5 mm 30 mm Radius,
EC 0,45 mm 0,73 mm Diameter
a
A chamfer or radius is allowed to a maximum depth of 0,5 mm from the ferrule endface.
b
The delatch housing shall be movable toward the right and the left directions. These
dimensions are given when the coupling sleeve is moved in its most right-direction position.
c
The dimension J is given for the plug endface when not mated. It is noticed that the ferrule is
movable by a certain axial compression force with direct contacting endfaces, and therefore
the dimension J is variable. Ferrule compression force shall be 5,5 N to 6,5 N when the
position of the optical datum target from the mechanical datum target is moved in the range of
3,9 mm to 4,1 mm. In addition, the dimension J shall become less than 3,25 mm with a
relatively large axial compression force.
d
The right-side position of Q shall become the left-side position to the mechanical datum target
when the coupling sleeve is moved to its most left-direction position.
e
40° to 45° are desirable to minimize debris for backplane connectors.
f
Dome eccentricity of the spherically polished ferrule endface shall be less than 70 µm.

Table 5 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 1,248 3 1,249 5
b
Bm 1.246 7 1,249 5
a
See IEC 61755-3-1
b
See IEC 61755-6-1.
Figure 2 is an example of a 4,5 mm duplex plug connector interface. Table 6 gives
dimensions of the 4,5 mm duplex plug connector interface e and Table 7 gives the grade of
the 4,5 mm duplex plug connector interface.

– 14 – IEC 61754-6:2013 © IEC 2013
Mechanical
datum target
Delatch housing
IEC  1861/13
Figure 2 – 4,5 mm duplex plug connector interface – Push/pull

Table 6 – Dimensions of the 4,5 mm duplex plug connector interface
Dimensions
Reference Remarks
Minimum Maximum
a
A 1,249 5 mm , see Table 7
B 2,6 mm 2,7 mm
C 4,6 mm 4,8 mm
D 4,65 mm 4,75 mm
E 4,3 mm 4,4 mm
F 3,3 mm 3,4 mm
G 25° 35° Angle
H 25° 35° Angle
\b
I 6,55 mm –
c
J 4,2 mm 4,5 mm
K 5,5 mm –
L 2,4 mm 2,5 mm
M 1,5 mm –
N 0,6 mm –
O 0,5 mm –
b
P 2,6 mm –
b d
Q 1,0 mm 1,1 mm and
b
R 2,65 mm 2,9 mm
S 5,5 mm 5,6 mm
T 4,3 mm 4,5 mm
U – 3,7 mm
V – 2,4 mm
W 6,5 mm 6,6 mm
AB 3,7 mm 3,85 mm
AC 0,7 mm 0,9 mm
AD 0,2 mm – Radius
AE 3,0 mm –
AF 2,2 mm 2,3 mm
AJ 8,8 mm 8,9 mm
AK 8,35 mm 8,45 mm
AL 4,55 mm 4,7 mm
AM 4,45 mm 4,55 mm
AP – 3,7 mm
e
EA 32.5° 45°
f
EB 5 mm 30 mm Radius
EC 0,45 mm 0,73 mm Diameter
a
A chamfer or radius is allowed to a maximum depth of 0,5 mm from the ferrule endface.
b
The delatch housing shall be movable toward the right and the left directions. These
dimensions are given when the coupling sleeve is moved in its most right-direction position.
c
The dimension J is given for the plug endface when not mated. It is noticed that the ferrule is
movable by a certain axial compression force with direct contacting endfaces, and therefore
the dimension J is variable. Ferrule compression force shall be 5,5 N to 6,5 N when the
position of the optical datum target from the mechanical datum target is moved in the range of
3,9 mm to 4,1 mm. In addition, the dimension J shall become less than 3,25 mm with a
relatively large axial compression force.
d
The right-side position of Q shall become left-side position to the mechanical datum target
when the coupling sleeve is moved to its most left-direction position.
e
40° to 45° are desirable to minimize debris for backplane connectors.
f
Dome eccentricity of the spherically polished ferrule endface shall be less than 70 µm.

– 16 – IEC 61754-6:2013 © IEC 2013
Table 7 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 1,248 3 1,249 5
b
Bm 1,246 7 1,249 5
a
See IEC 61755-3-1.
b
See IEC 61755-6-1.
Figure 3 is an example of a simplex adaptor connector interface. Table 8 gives dimensions of
the simplex adaptor connector interface and Table 9 gives the grade of the simplex adaptor
connector interface.
Mechanical
datum target
2× AJ
IEC  1862/13
Figure 3 – Simplex adaptor connector interface – Push/pull

– 18 – IEC 61754-6:2013 © IEC 2013
Table 8 – Dimensions of the simplex adaptor connector interface
Dimensions
mm
Reference Remarks
Minimum Maximum
A  Diameter, see Table 9
B 2,39 2,59 Diameter
D 4,8 5
E 4,55 –
a
F 2,9 3,5
I – 6,5
J 3,9 4,1
K – 5,4
L 2,55 2,7
M – 1,4
N – 0,55
O – 0,6
P – 1,2
Q – 0,4
R – 2,55
S 5,65 5,75
U 3,8 4
V 3,3 –
W 6,7 –
AA 4,45 4,55
AB 4,01 4,11
AC 0,95 1,15
AD – 0,2 Radius
AE 2,8 2,95
AF 1,9 2,1
AG 0,3 – Radius
AH 0,4 0,55
AI 1,34 1,44 Diameter
AJ – 0,3 Radius
a
The dimension F shall become greater than 4,5 mm when a plug is coupled to or removed from
the adaptor.
Table 9 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
– – Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a
gauge pin to the centre of the adaptor with a force of 1 N to 2,5 N on condition that another
gauge pin is inserted into the feature from the other side. The centre of the adaptor is defined

by the right-side position of the dimension J. The gauge pin is shown in Figure 4 and Table 10.

Figure 4 is an example of a gauge pin for resilient alignment sleeve. Table 10 gives gauge pin
dimensions.
LN
C or R
IEC  1863/13
Figure 4 – Gauge pin for resilient alignment sleeve
Table 10 – Gauge pin dimensions
Dimensions
mm
Reference Remarks
Minimum Maximum
LK 1,248 5 1,249 5 Surface roughness
grade N4
(0,2 µm radius)
LL 2,6 2,8
LN 4,7 9,5
Figure 5 is an example of a 4,5 mm duplex adaptor connector interface. Table 11 gives
dimensions of the 4,5 mm duplex adaptor connector interface and Table 12 gives the grade of the
4,5 mm duplex adaptor connector interface.

∅LK
∅LL
– 20 – IEC 61754-6:2013 © IEC 2013

Mechanical
datum target
2× AJ
IEC  1864/13
Figure 5 – 4,5 mm duplex adaptor connector interface – Push/pull

Table 11 – Dimensions of the 4,5 mm duplex adaptor connector interface
Dimensions
mm
Reference Remarks
Minimum Maximum
A  See Table 12
B 2,39 2,59
D 4,8 5
E 4,55 –
a
F 2,9 3,5
I – 6,5
J 3,9 4,1
K – 5,4
L 2,55 2,7
M – 1,4
N – 0,55
O – 0,6
P – 1,2
Q – 0,4
R – 2,55
S 5,65 5,75
U 3,8 4
V 3,3 –
W 6,7 –
AA 4,45 4,55
AB 4,01 4,11
AC 0,95 1,15
AD – 0,2 Radius
AE 2,8 2,95
AF 1,9 2,1
AG 0,3 – Radius
AH 0,4 0,55
AI 1,34 1,44 Diameter
AJ – 0,3 Radius
AM 4,45 4,55
AP 3,8 4
a
The dimension F shall become greater than 4,5 mm when a plug is coupled to or removed from
the adaptor.
– 22 – IEC 61754-6:2013 © IEC 2013
Table 12 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
1  Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a
gauge pin to the centre of the adaptor with a force of 1 N to 2,5 N under the condition that
another gauge pin is inserted into the feature from the other side. The centre of the adaptor is
defined by the right-side position of the dimension J. The gauge pin is shown in Figure 4 and

Table 10.
Figure 6 is an example of an 8-port adaptor connector interface. Table 13 gives dimensions of
the 8-port adaptor connector interface and Table 14 gives the grade of the 8-port adaptor
connector interface.
A
Mechanical
datum target
B
C
C
B
Detail of A Cross-section B-B
2× AJ
Cross-section C-C
IEC  1865/13
Figure 6 – 8-port adaptor connector interface – Push/pull

– 24 – IEC 61754-6:2013 © IEC 2013
Table 13 – Dimensions of the 8-port adaptor connector interface
Dimensions
mm
Reference Remarks
Minimum Maximum
A  See Table 14
B 2,39 2,59
D 4,8 5
E 4,55 –
a
F 2,9 3,5
I – 6,5
J 3,9 4,1
K – 5,4
L 2,55 2,7
M – 1,4
N – 0,55
O – 0,6
P – 1,2
Q – 0,4
R – 2,55
S 5,65 5,75
U 3,8 4
V 3,3 –
W 6,7 –
AA 4,45 4,55
AB 4,01 4,11
AC 0,95 1,15
AD – 0,2 Radius
AE 2,8 2,95
AF 1,9 2,1
AG 0,3 – Radius
AH 0,4 0,55
AI 1,34 1,44 Diameter
AJ – 0,3 Radius
AM 4,45 4,55
AP 3,8 4
AQ 4,8 5,2
a
The dimension F shall become greater than 4,5 mm when a plug is coupled to or removed from
the adaptor.
Table 14 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
1  Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a
gauge pin to the centre of the adaptor with a force of 1 N to 2,5 N under the condition that
another gauge pin is inserted into the feature from the other side. The centre of the adaptor is
defined by the right-side position of the dimension J. The gauge pin is shown in Figure 4 and
Table 10.
Figure 7 is an example of a plug connector interface. Table 15 gives dimensions of the plug
connector interface and Table 16 gives the grade of the plug connector interface.

Figure 7 – Plug connector interface – For printed board housings

– 26 – IEC 61754-6:2013 © IEC 2013
Table 15 – Dimensions of the plug connector interface
Dimensions
Reference Remarks
Minimum Maximum
a
A 1,249 5 mm See Table 16
B 2,6 mm 2,7 mm Diameter
D 4,65 mm 4,75 mm
E 4,3 mm 4,4 mm
F 3,3 mm 3,4 mm
b
J 4,2 mm 4,5 mm
K 5,5 mm –
L 2,4 mm 2,5 mm
M 1,5 mm –
N 0,6 mm –
O 0,5 mm –
AR 3,65 mm 3,75 mm
AS 2,9 mm 3,0 mm
AT 1,7 mm 2,1 mm
AU 43° 47°
AV – 3,0 mm
c
EA 32,5° 45°
d
EB 5 mm 30 mm Radius
EC 0,45 mm 0,73 mm
a
A chamfer or radius is allowed to a maximum depth of 0,5 mm from the ferrule endface.
b
The dimension J is given for the plug endface when not mated. It is noticed that the ferrule is
movable by a certain axial compression force with direct contacting endfaces, and therefore the
dimension J is variable. Ferrule compression force shall be 5,5 N to 6,5 N when the position of
the optical datum target from the mechanical datum target is moved in the range of 3,9 mm to
4,1 mm. In addition, the dimension J shall become less than 3,25 mm with a relatively large
axial compression force.
c
40° to 45° are desirable to minimize debris for backplane connectors.
d
Dome eccentricity of the spherically polished ferrule endface shall be less than 70 µm.

Table 16 – Grade
Dimensions
mm
Grade Remarks
A
Minimum Maximum
a
A – –
a
B – –
a
C – –
a
D – –
b
Am 1,248 3 1,249 5
b
Bm 1,246 7 1,249 5
a
See IEC 61755-3-1.
b
See IEC 61755-6-1.
Figure 8 is an example of the sleeve holder interface. Table 17 gives dimensions of the sleeve
holder interface and Table 18 gives the grade of the sleeve holder interface.
Mechanical
datum target
IEC  1867/13
Figure 8 – Sleeve holder interface

– 28 – IEC 61754-6:2013 © IEC 2013
Table 17 – Dimensions of the sleeve holder interface
Dimensions
mm
Reference Remarks
Minimum Maximum
A  See Table 18
B 2,54 2,59 Diameter
AI 1,34 1,39 Diameter
BA 4,65 4,85
BB 0,20 0,30
BC 3,65 3,85
BD 0,65 0,85
BE 2,9 3,1
BF – 0,25 45° chamfer
BG 3,5 3,54 Diameter
BH 3,1 3,2 Diameter
BI 2,5 2,7 Diameter
BJ 0,29 0,37
BK 2,49 2,59 Diameter
Table 18 – Grade
Dimensions
mm
Grade Remarks
Minimum Maximum
a
Resilient sleeve
a
The connector alignment feature is a resilient alignment sleeve. The feature shall accept a
gauge pin to a depth of 4,3 mm from the left side with a force of 1 N to 2,5 N under the condition
that another gauge pin is inserted into the feature from the other side. The gauge pin is shown
in Figure 4 and Table 10.
Figure 9 is an example of the 2-port backplane housing interface. Table 19 gives dimensions
of the 2-port backplane housing interface and Table 20 gives the grade of the 2-port
backplane housing interface.
B
A
Mechanical
datum target
Expanded view A
IEC  1868/13
Figure 9 (continued overleaf)
– 30 – IEC 61754-6:2013 © IEC 2013
Mechanical
datum target
C
D
D
C
2× AJ
Expanded view B
Cross-section C-C
E
Expanded cross-section E
Cross-section D-D
IEC  1869/13
NOTE 1 In the cross-section C-C figure, the inner housing should be movable to the right by at least 0,9 mm, and
to the left by at least 2 mm when the inner latch is released.
NOTE 2 In the expanded cross-section E figure, the inner latch spring should be moved by more than 0,65 mm to
the right when the inner latch is released or latched.
Figure 9 – 2-port backplane housing interface

Mecha
...