SIST EN IEC 63171-1:2026
(Main)Connectors for electrical and electronic equipment - Part 1: Detail specification for 2-way, shielded or unshielded, free and fixed connectors - Mechanical mating information, pin assignment and additional requirements for Type 1 (copper LC style) (IEC 63171-1:2024)
- Abstract
This part of IEC 63171 covers two-way, shielded or unshielded, free and fixed connectors known as Type 1, for balanced single-pair data transmission with frequencies up to 600 MHz and with current carrying capacity up to 2,0 A at 60 °C.
It specifies the common dimensions, and provides the mechanical, electrical, signal integrity, and environmental characteristics, the reliability specifications and corresponding tests for these connectors.
- Status
- Published
- Public Enquiry End Date
- 31-Dec-2025
- Publication Date
- 17-Aug-2026
- Technical Committee
- I11 - Imaginarni 11
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 04-Aug-2026
- Due Date
- 09-Oct-2026
- Completion Date
- 18-Aug-2026
SIST EN IEC 63171-1:2026 is a CENELEC European Standard for Type 1 (copper LC style) connectors for electrical and electronic equipment. It specifies the mechanical mating interface, pin assignment, and additional mechanical, electrical, signal integrity, environmental, and reliability requirements for 2-way shielded or unshielded free and fixed connectors used for balanced single-pair data transmission.
What does SIST EN IEC 63171-1:2026 specify?
SIST EN IEC 63171-1:2026 covers two-way, shielded or unshielded, free and fixed connectors known as Type 1. The scope links these connectors to balanced single-pair data transmission with frequencies up to 600 MHz and current carrying capacity up to 2,0 A at 60 °C.
The document is organized into six clauses:
- Clause 1 Scope
- Clause 2 Normative references
- Clause 3 Terms and definitions
- Clause 4 Common features and typical connector pair
- Clause 5 Characteristics
- Clause 6 Tests and test schedule
Annex ZA gives the normative references to international publications and their corresponding European publications. Figures and tables in Clauses 4 to 6 provide the interface drawings, dimensional data, and test arrangements that support the written requirements.
What are the key requirements of SIST EN IEC 63171-1:2026?
Mating interface and interoperability
SIST EN IEC 63171-1:2026 defines the common mating dimensions for the Type 1 connector interface in Clause 4. The drawings are given in millimetres, and the shapes may vary as long as the specified dimensions stay unchanged. For unshielded versions, the document keeps the same basic mating geometry as the shielded versions, with only the shield-related dimensions differing.
This matters because interchangeability depends on the interface geometry, not just on the product name. Clause 4.1.2 states that compliance with the interface dimensions and the relevant signal integrity tests is what allows connectors from different sources to work together in the same category.
Separation from LC fibre optic connectors
Clause 4.1.2 also makes clear that Type 1 connectors have features that prevent intermateability with standard LC fibre optic connectors according to IEC 61754-20. The document uses the copper LC style form factor, but the copper connector and the fibre optic connector are not meant to mate.
In practice, this avoids accidental cross-use in mixed installations. Buyers and designers can use the LC-like shape as a visual cue, but still need to specify the connector type correctly.
Pin assignment and climatic classification
Clause 5.2 fixes the pin assignment for Type 1 connectors by reference to Figure 4b. Clause 5.3 then ties the connector to a climatic category compatible with the M I C E environment classification in ISO/IEC 11801-1, using the category stated in the document.
This matters for system design and qualification because the connector is not only an interface component. It must also fit the environmental conditions expected in the installation.
Electrical performance
Clause 5.4 covers creepage and clearance, voltage proof, current-temperature derating, contact resistance, input-to-output DC resistance, unbalanced DC resistance, and initial insulation resistance. Table 4 gives the minimum creepage and clearance distances for contacts to chassis and between adjacent contacts.
For users, this is the section that supports insulation, safety, and power-carrying checks. It tells the test laboratory and the product engineer what electrical properties must be measured and how the connector interface is expected to behave.
Transmission performance
Clause 5.5 sets the transmission characteristics. The standard uses category B for insertion loss, return loss, transverse conversion loss, transverse conversion transfer loss, power sum alien NEXT, and power sum alien FEXT. Shielded connectors also have requirements for transfer impedance and coupling attenuation.
This is the part that matters most for data performance. It tells the reader that signal integrity is not left to vendor claims - it is part of the connector qualification.
Mechanical performance and testing
Clause 5.6 covers mechanical operation, connector coupling devices, insertion and withdrawal forces, polarizing method, and dynamic stress. The document uses Mating Performance Level MPL750 and the latch connector style for the relevant mechanical checks.
Clause 6 then turns those characteristics into test practice. It includes example arrangements for resistance measurements and a vibration test setup, plus preconditioning and both basic and full test schedules.
What terms does SIST EN IEC 63171-1:2026 define?
- Type 1 - The connector family covered by this detail specification for balanced single-pair data transmission.
- copper LC style - An electrical connector with a form factor similar to LC fibre optic connectors, but not intermateable with them.
- Insertion loss (IL) - The transmission loss through the connector interface.
- Return loss (RL) - The amount of signal reflected back from the connector interface.
- Transverse conversion loss (TCL) - A measure of how much imbalance converts differential signals into common-mode signals.
- Transverse conversion transfer loss (TCTL) - A related balance and conversion measure used for transmission performance.
- Mating Performance Level MPL750 - The mechanical operation level used for the connector mating performance requirement.
- M I C E - The environment classification referenced through ISO/IEC 11801-1 for installation conditions.
Who uses SIST EN IEC 63171-1:2026?
SIST EN IEC 63171-1:2026 is used by connector manufacturers, equipment makers, cable and cabling-system designers, test laboratories, and quality or procurement teams. It is relevant wherever balanced single-pair data transmission connectors must be specified, designed, qualified, or compared across suppliers.
In practice, these users rely on the standard to choose the connector interface, check interoperability, prepare data sheets, run qualification tests, and confirm that shielded or unshielded variants meet the intended application conditions.
What changed in SIST EN IEC 63171-1:2026 from the previous edition?
SIST EN IEC 63171-1:2026 supersedes EN IEC 63171-1:2020 and all of its amendments and corrigenda, if any. The underlying IEC edition identifies these notable updates compared with the previous edition:
- updated information on obtaining a license agreement
- alignment of connector characteristics and test requirements with IEC 63171:2021 where applicable
- added requirements for polarizing method and dynamic stress
- added test group BP - Moisture to align with IEC 63171:2021
Which standards are used with SIST EN IEC 63171-1:2026?
- IEC 60050-581 - provides electromechanical vocabulary used for the terms and definitions.
- IEC 60068-1 - provides general environmental testing guidance and supports the climatic classification.
- IEC 60512-1 - provides the generic specification for connector tests and measurements.
- IEC 61754-20 - gives the LC fibre optic connector family reference used to distinguish the copper LC style from fibre optic LC interfaces.
- IEC 63171 - provides the general requirements and tests for the IEC 63171 series.
- ISO/IEC 11801-1 - provides the generic cabling framework and the M I C E environment classification referenced in Clause 5.3.
What does the SIST EN IEC 63171-1:2026 document contain?
SIST EN IEC 63171-1:2026 contains connector overview drawings, mating-interface figures, pin detail drawings, and dimensional tables for the fixed and free connector parts. It also includes a table of creepage and clearance distances and a vibration test arrangement.
The document’s test section gives example measurement setups, preconditioning, and basic and full qualification schedules. Those schedules are used for design verification, laboratory testing, and product qualification of the connector family.
Annex ZA links the requirements to the corresponding European publications for the cited international standards.
Relations
- Effective Date
- 01-Sep-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 04-Aug-2026
- Effective Date
- 04-Aug-2026
- Effective Date
- 04-Aug-2026
Frequently Asked Questions
SIST EN IEC 63171-1:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Connectors for electrical and electronic equipment - Part 1: Detail specification for 2-way, shielded or unshielded, free and fixed connectors - Mechanical mating information, pin assignment and additional requirements for Type 1 (copper LC style) (IEC 63171-1:2024)". This standard covers: This part of IEC 63171 covers two-way, shielded or unshielded, free and fixed connectors known as Type 1, for balanced single-pair data transmission with frequencies up to 600 MHz and with current carrying capacity up to 2,0 A at 60 °C. It specifies the common dimensions, and provides the mechanical, electrical, signal integrity, and environmental characteristics, the reliability specifications and corresponding tests for these connectors.
This part of IEC 63171 covers two-way, shielded or unshielded, free and fixed connectors known as Type 1, for balanced single-pair data transmission with frequencies up to 600 MHz and with current carrying capacity up to 2,0 A at 60 °C. It specifies the common dimensions, and provides the mechanical, electrical, signal integrity, and environmental characteristics, the reliability specifications and corresponding tests for these connectors.
SIST EN IEC 63171-1:2026 is classified under the following ICS (International Classification for Standards) categories: 31.220.10 - Plug-and-socket devices. Connectors. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 63171-1:2026 has the following relationships with other standards: It is inter standard links to SIST EN IEC 63171-1:2020, SIST EN 60068-1:2014, SIST EN 61754-20:2012/A1:2022, SIST EN IEC 63171:2021, SIST EN IEC 60512-1:2019, SIST EN 61754-20:2012, SIST EN IEC 63171-5:2022, SIST EN 50173-10:2025, SIST EN IEC 60512-99-003:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN IEC 63171-1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN IEC 63171-1:2020
Konektorji za električno in elektronsko opremo - 1. del: Podrobne specifikacije za
dvopolne, zaslonjene ali nezaslonjene, proste ali pritrjene konektorje - Informacije
o mehanskih prilagoditvah, funkcije polov in dodatne zahteve za tip 1 (baker, vrsta
LC) (IEC 63171-1:2024)
Connectors for electrical and electronic equipment - Part 1: Detail specification for 2-way,
shielded or unshielded, free and fixed connectors - Mechanical mating information, pin
assignment and additional requirements for Type 1 (copper LC style) (IEC 63171-
1:2024)
Steckverbinder für elektrische und elektronische Einrichtungen - Teil 1:
Bauartspezifikation für geschirmte oder ungeschirmte freie und feste Steckverbinder, 2-
polig - Mechanische Steckinformationen, Pinbelegung und zusätzliche Anforderungen für
Typ 1 (Kupfer LC Bauform) (IEC 63171-1:2024)
Connecteurs pour équipements électriques et électroniques - Partie 1 : Spécification
particulière pour fiches et embases écrantées ou non écrantées à 2 pôles - Informations
d’accouplement mécanique, affectation des broches et exigences supplémentaires pour
le type 1 (modèle LC en cuivre) (IEC 63171-1:2024)
Ta slovenski standard je istoveten z: EN IEC 63171-1:2026
ICS:
31.220.10 Vtiči in vtičnice, konektorji Plug-and-socket devices.
Connectors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 63171-1
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2026
ICS 31.220.10 Supersedes EN IEC 63171-1:2020
English Version
Connectors for electrical and electronic equipment - Part 1:
Detail specification for 2-way, shielded or unshielded, free and
fixed connectors - Mechanical mating information, pin
assignment and additional requirements for Type 1 (copper LC
style)
(IEC 63171-1:2024)
Connecteurs pour équipements électriques et électroniques Steckverbinder für elektrische und elektronische
- Partie 1 : Spécification particulière pour fiches et embases Einrichtungen - Teil 1: Bauartspezifikation für geschirmte
écrantées ou non écrantées à 2 pôles - Informations oder ungeschirmte freie und feste Steckverbinder, 2-polig -
d'accouplement mécanique, affectation des broches et Mechanische Steckinformationen, Pinbelegung und
exigences supplémentaires pour le type 1 (modèle LC en zusätzliche Anforderungen für Typ 1 (Kupfer LC Bauform)
cuivre) (IEC 63171-1:2024)
(IEC 63171-1:2024)
This European Standard was approved by CENELEC on 2026-03-02. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63171-1:2026 E
European foreword
This document (EN IEC 63171-1:2026) consists of the text of document IEC 63171-1:2024, prepared
by IEC/SC 48B “Electrical connectors” of IEC/TC 48 "Electrical connectors and mechanical structures
for electrical and electronic equipment".
The following dates are fixed:
• latest date by which this document has to be (dop) 2027-07-31
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) 2029-07-31
conflicting with this document have to be withdrawn
This document supersedes EN IEC 63171-1:2020 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63171-1:2024 was approved by CEN-CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60068 (series) NOTE Approved as EN 60068 (series)
IEC 60352 (series) NOTE Approved as EN IEC 60352 (series)
IEC 60512 (series) NOTE Approved as EN IEC 60512 (series)
IEC 63171 (series) NOTE Approved as EN IEC 63171 (series)
Annex ZA
(normative)
Normative references to international publications with their
corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-581 2008 International Electrotechnical Vocabulary - - -
Part 581: Electromechanical components for
electronic equipment
IEC 60068-1 2013 Environmental testing - Part 1: General and EN 60068-1 2014
guidance
IEC 60512-1 2018 Connectors for electrical and electronic EN IEC 60512-1 2018
equipment - Tests and measurements - Part
1: Generic specification
IEC 61754-20 2012 Fibre optic interconnecting devices and EN 61754-20 2012
passive components - Fibre optic connector
interfaces - Part 20: Type LC connector family
+ AMD1 2022 + A1 2022
IEC 63171 2021 Connectors for electrical and electronic EN IEC 63171 2021
equipment - Shielded or unshielded free and
fixed connectors for balanced single-pair data
transmission with current-carrying capacity -
General requirements and tests
ISO/IEC 11801-1 2017 Information technology - Generic cabling for - -
customer premises - Part 1: General
requirements
IEC 63171-1 ®
Edition 2.0 2024-04
INTERNATIONAL
STANDARD
Connectors for electrical and electronic equipment –
Part 1: Detail specification for 2-way, shielded or unshielded, free and fixed
connectors – Mechanical mating information, pin assignment and additional
requirements for Type 1 (copper LC style)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.220.10 ISBN 978-2-8322-8217-5
– 2 – IEC 63171-1:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
4 Common features and typical connector pair . 10
4.1 Mating information . 10
4.1.1 General . 10
4.1.2 Interoperability . 10
4.1.3 Contacts – Mating conditions . 11
4.1.4 Fixed connector . 11
4.1.5 Free connector . 15
5 Characteristics . 16
5.1 General . 16
5.2 Pin assignment . 16
5.3 Classification into climatic category . 16
5.4 Electrical characteristics . 17
5.4.1 Creepage and clearance distances . 17
5.4.2 Voltage proof . 17
5.4.3 Current-temperature derating . 17
5.4.4 Initial contact resistance – interface only . 17
5.4.5 Input to output DC resistance . 17
5.4.6 Input to output DC resistance unbalanced. 17
5.4.7 Initial insulation resistance . 17
5.5 Transmission characteristics . 17
5.5.1 General . 17
5.5.2 Insertion loss (IL) . 17
5.5.3 Return loss (RL) . 18
5.5.4 Propagation delay . 18
5.5.5 Transverse conversion loss (TCL) . 18
5.5.6 Transverse conversion transfer loss (TCTL) . 18
5.5.7 Transfer impedance (shielded only) . 18
5.5.8 Coupling attenuation . 18
5.5.9 Power sum alien (exogenous) NEXT . 18
5.5.10 Power sum alien (exogenous) FEXT . 18
5.6 Mechanical characteristics . 18
5.6.1 Mechanical operation . 18
5.6.2 Effectiveness of connector coupling devices . 18
5.6.3 Insertion and withdrawal forces . 18
5.6.4 Polarizing method . 18
5.6.5 Dynamic stress . 18
6 Tests and test schedule . 19
6.1 General . 19
6.2 Example of arrangement for input to output contact resistance measurement . 19
6.3 Example of arrangement for contact resistance measurement . 19
6.4 Arrangement for vibration test (test phase DP) . 19
IEC 63171-1:2024 © IEC 2024 – 3 –
6.5 Test procedures and measuring methods . 19
6.6 Preconditioning . 20
6.7 Test schedules . 20
6.7.1 General . 20
6.7.2 Basic (minimum) test schedule . 20
6.7.3 Full test schedule . 20
Bibliography . 21
Figure 1 – Relationships between the IEC 63171 series and its related references . 7
Figure 2 – Connector overview . 8
Figure 3 – Mated fixed and free Type 1 connectors . 11
Figure 4 – Fixed Type 1 connector . 12
Figure 5 – Fixed Type 1 connector pin detail (detail A from Figure 4c) section D-D) . 14
Figure 6 – Free Type 1 connector . 15
Figure 7 – Arrangement for vibration test . 19
Table 1 – Dimensions for Figure 4a), Figure 4b) and Figure 4c) . 13
Table 2 – Dimensions for Figure 5 . 14
Table 3 – Dimensions for Figure 6a) and Figure 6b) . 16
Table 4 – Creepage and clearance distances . 17
– 4 – IEC 63171-1:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –
Part 1: Detail specification for 2-way, shielded or unshielded, free and
fixed connectors – Mechanical mating information, pin assignment and
additional requirements for Type 1 (copper LC style)
FOREWORD
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8) Attention is drawn to the Normative references cited
...