IEC 61076-3-124:2019

IEC 61076-3-124 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electrical and electronic equipment – Product requirements –
Part 3-124: Rectangular connectors – Detail specification for 10-way, shielded,
free and fixed connectors for I/O and data transmission with frequencies up to
500 MHz
Connecteurs pour équipements électriques et électroniques – Exigences de
produit –
Partie 3-124: Connecteurs rectangulaires – Spécification particulière pour les
fiches et les embases écrantées à 10 voies pour les entrées/sorties et la
transmission de données à des fréquences jusqu'à 500 MHz

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IEC 61076-3-124 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electrical and electronic equipment – Product requirements –

Part 3-124: Rectangular connectors – Detail specification for 10-way, shielded,

free and fixed connectors for I/O and data transmission with frequencies up to

500 MHz
Connecteurs pour équipements électriques et électroniques – Exigences de

produit –
Partie 3-124: Connecteurs rectangulaires – Spécification particulière pour les

fiches et les embases écrantées à 10 voies pour les entrées/sorties et la

transmission de données à des fréquences jusqu'à 500 MHz

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.220.10 ISBN 978-2-8322-6608-3

– 2 – IEC 61076-3-124:2019 © IEC 2019
CONTENTS
FOREWORD . 5
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 10
4 Technical information . 10
4.1 Systems of levels – Compatibility levels, according to IEC 61076-1:2006 . 10
4.1.1 Performance level . 10
4.1.2 Compatibility levels according to IEC 61076 . 10
4.2 Classification into climatic categories . 10
4.3 Clearance and creepage distances . 11
4.4 Current carrying capacity . 11
4.5 Marking . 11
5 Dimensional information . 11
5.1 General . 11
5.2 Isometric view and common features . 11
5.2.1 Common features . 11
5.2.2 Reference system . 11
5.3 Mating information – Contacts – mating conditions. 12
5.4 Fixed connector . 14
5.5 Free connector . 20
5.6 Accessories . 25
5.7 Mounting information for connectors . 25
5.8 Gauges . 25
6 Characteristics . 26
6.1 General . 26
6.2 Pin and pair grouping assignment . 26
6.3 Classification into climatic category . 28
6.4 Electrical characteristics . 28
6.4.1 Voltage rating . 28
6.4.2 Creepage and clearance distances . 28
6.4.3 Voltage proof . 29
6.4.4 Current-carrying capacity . 29
6.4.5 Contact and shield resistance . 30
6.4.6 Initial insulation resistance . 30
6.4.7 Impedance . 30
6.5 Mechanical characteristics . 31
6.5.1 Mechanical operation . 31
6.5.2 Insertion and withdrawal forces . 31
6.5.3 Polarization and coding method . 31
6.5.4 Effectivess of connector coupling devices . 31
6.6 Transmission performance . 32
6.6.1 General . 32
6.6.2 Insertion loss . 32
6.6.3 Return loss . 32
6.6.4 Near-end crosstalk . 32
6.6.5 Far-end crosstalk . 33

6.6.6 Transverse conversion loss . 33
6.6.7 Transverse conversion transfer loss . 33
6.6.8 Transfer impedance . 33
6.6.9 Propagation delay . 33
6.6.10 Delay skew . 33
7 Test schedule . 34
7.1 General . 34
7.2 Test procedures and measuring methods . 34
7.3 Mounting of specimens . 34
7.3.1 General . 34
7.3.2 Arrangement for contact resistance measurement . 34
7.3.3 Arrangement for dynamic stress tests . 35
7.3.4 Wiring of specimens . 36
7.4 Test schedules . 36
7.4.1 Basic (minimum) test schedule . 36
7.4.2 Full test schedule . 36

Figure 1 – View showing typical fixed and free connectors . 11
Figure 2 – Contact interface dimensions with terminated free connector . 12
Figure 3a – Fixed connector Type A. 14
Figure 3b – Fixed connector Type B. 16
Figure 3c – Fixed connector Type C. 18
Figure 3 – Fixed connectors . 18
Figure 4a – Free connector Type A . 20
Figure 4b – Free connector Type B . 22
Figure 4c – Free connector Type C . 24
Figure 4 – Free connectors . 24
Figure 5a – Fixed connector pin assignment for Type A, front view of connector . 26
Figure 5b – Free connector pin assignment for Type A, front view of connector . 26
Figure 5c – Fixed connector pin assignment for Type B, front view of connector . 26
Figure 5d – Free connector pin assignment for Type B, front view of connector . 27
Figure 5e – Fixed connector pin assignment for Type C, front view of connector . 27
Figure 5f – Free connector pin assignment for Type C, front view of connector . 27
Figure 5 – Connector pin assignment . 27
Figure 6 – Derating diagram . 30
Figure 7 – Contact resistance arrangement . 35
Figure 8 – Arrangement for vibration test . 36

Table 1 – Dimensions for Figure 2 . 12
Table 2 – Dimensions for Figure 3a . 15
Table 3 – Dimensions for Figure 3b . 17
Table 4 – Dimensions for Figure 3c . 19
Table 5 – Dimensions for Figure 4a . 21
Table 6 – Dimensions for Figure 4b . 23
Table 7 – Dimensions for Figure 4c . 25

– 4 – IEC 61076-3-124:2019 © IEC 2019
Table 8 – Board connector pin assignment for 10/100 Mbit/s Ethernet (Type A connectors
of Figure 5a and Figure 5b and Type C connectors of Figure 5e and Figure 5f) . 27
Table 9 – Board connector pin assignment for 1/10 Gbit/s Ethernet: (Type A connectors

of Figure 5a and Figure 5b and Type C connectors of Figure 5e and Figure 5f) . 28
Table 10 – Climatic category . 28
Table 11 – Creepage and clearance distances . 29
Table 12 – Preferred values for the number of mating cycles . 31
Table 13 – Test group P . 37
Table 14 – Test group AP . 38
Table 15 – Test group BP . 40
Table 16 – Test group CP . 41
Table 17 – Test group DP . 42
Table 18 – Test group EP . 43
Table 19 – Test group FP . 44

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –
PRODUCT REQUIREMENTS –
Part 3-124: Rectangular connectors – Detail specification for 10-way,
shielded, free and fixed connectors for I/O and data transmission
with frequencies up to 500 MHz

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
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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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.
This International Standard IEC 61076-3-124 has been prepared by subcommittee 48B:
Electrical connectors, of IEC technical committee 48: Electrical connectors and mechanical
structures for electrical and electronic equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
48B/2711/FDIS 48B/2726/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 6 – IEC 61076-3-124:2019 © IEC 2019
A list of all parts in the IEC 61076 series, published under the general title Connectors for
electrical and electronic equipment – Product requirements, 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 "http://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.
The contents of the corrigendum of March 2020 have been included in this copy.

IEC SC 48B – Electrical connectors IEC 61076-3-124 Ed. 1

Specification available from:
IEC General secretariat
Or from the addresses shown on the inside cover.

ELECTRONIC COMPONENTS
DETAIL SPECIFICATION in accordance with IEC 61076-1
10-way, shielded rectangular
connectors
male and female connectors
for data transmission with
frequencies up to 500 MHz
solderless terminations, solder or
printed board connections upon
agreement between manufacturer
and user
rewirable – non-rewirable
free cable connectors
NOTE The above axonometric view shows a Type A connector pair
(male fixed, printed board connector style, female free connector style)
straight and right-angle connectors
with coding edge on lower left corner viewed on the fixed connector
mating side fixed connectors are mounted on
printed circuit board by means of
soldering or press-in, the free
connector is attached to wires by
means of soldering, crimping, IDC or
other termination technology.
locking means to avoid unintended
disengagement of mated connectors
Performance levels:
MPL 750 = 500 mating cycles
MPL 2 500 = 2 500 mating cycles
MPL 5 000 = 5 000 mating cycles
other MPL upon agreement between
manufacturer and user
– 8 – IEC 61076-3-124:2019 © IEC 2019
CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –
PRODUCT REQUIREMENTS –
Part 3-124: Rectangular connectors – Detail specification for 10-way,
shielded, free and fixed connectors for I/O and data transmission
with frequencies up to 500 MHz

1 Scope
This part of IEC 61076 covers 10-way, shielded, free and fixed rectangular connectors for data
transmission with frequencies up to 500 MHz and specifies the common dimensions,
mechanical, electrical and transmission characteristics and environmental requirements as well
as test specifications respectively.
Connectors covered in this document are provided in three codings that differ only for the
position of the polarization key and keyway, in view of their differently intended use:
• Connectors Type A and C are intended for 10/100 Mbit/s as well as for 1/ 2,5 / 5 /10 Gbit/s
Ethernet communication.
• Connectors Type B are intended for all other non-Ethernet applications such as signalling,
serial or other industrial bus communication systems.
A-coding: The 45° cut corner used as polarization key and keyway system is located on the
lower left corner of the male fixed connector (viewed from mating face) (Figures 5a, 5b).
B-coding: The 45° cut corner is located on the upper left corner of the male fixed connector
(Figures 5c, 5d).
C-coding: There are two 45° corners located at the upper left and lower left corner
(Figures 5e, 5f).
In this document, the three codings, A, B, and C are designated as “Type A”, “Type B” and
“Type C”.
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 60050-581, International Electrotechnical Vocabulary – Part 581: Electromechanical
components for electronic equipment
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60068-2-38, Environmental testing – Part 2-38: Tests – Test Z/AD: Composite
temperature/humidity cyclic test
IEC 60352 (all parts), Solderless connections
IEC 60512-1, Connectors for electronic equipment – Tests and measurements – Part 1: General

IEC 60512-1-1, Connectors for electronic equipment – Tests and measurements – Part 1-1:
General examination – Test 1a: Visual examination
IEC 60512-1-2, Connectors for electronic equipment – Tests and measurements – Part 1-2:
General examination – Test 1b: Examination of dimension and mass
IEC 60512-2-1, Connectors for electronic equipment – Tests and measurements – Part 2-1:
Electrical continuity and contact resistance tests – Test 2a: Contact resistance – Millivolt level
method
IEC 60512-2-5, Connectors for electronic equipment – Tests and measurements – Part 2-5:
Electrical continuity and contact resistance tests – Test 2e: Contact disturbance
IEC 60512-3-1, Connectors for electronic equipment – Tests and measurements – Part 3-1:
Insulation tests – Test 3a: Insulation resistance
IEC 60512-4-1, Connectors for electronic equipment – Tests and measurements – Part 4-1:
Voltage stress tests – Test 4a: Voltage proof
IEC 60512-5-2, Connectors for electronic equipment – Tests and measurements – Part 5-2:
Current-carrying capacity tests – Test 5b: Current-temperature derating
IEC 60512-6-3, Connectors for electronic equipment – Tests and measurements – Part 6-3:
Dynamic stress tests – Test 6c: Shock
IEC 60512-6-4, Connectors for electronic equipment – Tests and measurements – Part 6-4:
Dynamic stress tests – Test 6d: Vibration (sinusoidal)
IEC 60512-9-1, Connectors for electronic equipment – Tests and measurements – Part 9-1:
Endurance tests – Test 9a: Mechanical operation
IEC 60512-11-3, Connectors for electronic equipment – Tests and measurements – Part 11-3:
Climatic tests – Test 11c: Damp heat, steady state
IEC 60512-11-4, Connectors for electronic equipment – Tests and measurements – Part 11-4:
Climatic tests – Test 11d: Rapid change of temperature
IEC 60512-11-7, Connectors for electronic equipment – Tests and measurements – Part 11-7:
Climatic tests – Test 11g: Flowing mixed gas corrosion test
IEC 60512-11-9, Connectors for electronic equipment – Tests and measurements – Part 11-9:
Climatic tests – Test 11i: Dry heat
IEC 60512-11-10, Connectors for electronic equipment – Tests and measurements –
Part 11-10: Climatic tests – Test 11j: Cold
IEC 60512-13-2, Connectors for electronic equipment – Tests and measurements – Part 13-2:
Mechanical operation tests – Test 13b: Insertion and withdrawal forces
IEC 60512-13-5, Connectors for electronic equipment – Tests and measurements – Part 13-5:
Mechanical operation tests – Test 13e: Polarizing and keying method
IEC 60512-15-6, Connectors for electronic equipment – Tests and measurements – Part 15-6:
Connector tests (mechanical) – Test 15f: Effectiveness of connector coupling devices

– 10 – IEC 61076-3-124:2019 © IEC 2019
IEC 60512-25-7, Connectors for electronic equipment – Tests and measurements – Part 25-7:
Test 25g – Impedance, reflection coefficient, and voltage standing wave ratio (VSWR)
IEC 60512-27-100, Connectors for electronic equipment – Tests and measurements – Part 27-
100: Signal integrity tests up to 500 MHz on 60603-7 series connectors – Tests 27a to 27g
IEC 60603-7:2008, Connectors for electronic equipment – Part 7: Detail specification for
8-way, unshielded, free and fixed connectors
IEC 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 61076-1:2006, Connectors for electronic equipment – Product requirements – Part 1:
Generic specification
IEC 61076-3:2008, Connectors for electronic equipment – Product requirements – Part 3:
Rectangular connectors - Sectional specification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-581,
IEC 61076-1, IEC 61076-3 and IEC 60512-1 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 Technical information
4.1 Systems of levels – Compatibility levels, according to IEC 61076-1:2006
4.1.1 Performance level
Connectors according to this document are classified by mating performance level (MPL).
See 6.5.1, Table 12 for details.
4.1.2 Compatibility levels according to IEC 61076
a) Intermateability
Intermateability (level 2 of IEC 61076-1:2006) standardizes only dimensions of electrical and
mechanical interfaces. Intermateability shall be ensured by application of the “Go” and “No-Go”
gauge requirements in the standards that may be referenced, and adherence to the dimensional
requirements within.
b) Interoperability
Interoperability of different connectors shall be assured by compliance with the specified
interface dimensions and by compliance with the relevant signal integrity test group FP.
4.2 Classification into climatic categories
See 6.3.
4.3 Clearance and creepage distances
See 6.4.2.
4.4 Current carrying capacity
See 6.4.4.
4.5 Marking
The marking of the connector and the packaging shall be in accordance with 2.7 of IEC 61076-
1:2006.
5 Dimensional information
5.1 General
Dimensions are given in millimetres. Drawings are shown in the third angle projection. The
shape of connectors may deviate from those shapes given in the following figures as long as
the specified dimensions are not influenced (see Figure 1 to Figure 8 and Table 1 to Table 9).
Coordination dimensions are dimensions without tolerances which indicate the boundary or
centre-line references in order to allow for (modular) arrangement.
5.2 Isometric view and common features

Figure 1 – View showing typical fixed and free connectors
5.2.1 Common features
Not applicable.
5.2.2 Reference system
Not applicable.
– 12 – IEC 61076-3-124:2019 © IEC 2019
5.3 Mating information – Contacts – mating conditions

NOTE Fixed male connector on the left side and free female connector on the right.
Figure 2 – Contact interface dimensions with terminated free connector
Table 1 – Dimensions for Figure 2
Dimensions in millimetres
Letter Minimum Nominal Maximum
AA1 3,35 3,5 3,65
AA2 1,6 1,8 2
This page is intentionally left blank.

– 14 – IEC 61076-3-124:2019 © IEC 2019
5.4 Fixed connector
Figure 3a – Fixed connector Type A

Table 2 – Dimensions for Figure 3a
Dimensions in millimetres
Letter Minimum Nominal Maximum
AA1 3,35 3,5 3,65
AB1 4,95 5,3 5,65
AC1 2,25 2,35 2,55
AD1 1,1 1,1 1,4
AE1 4,1 4,3 4,5
BA1 4,17 4,2 4,23
BB1 1,5 1,6 1,63
BC1 1,3 1,4 1,5
BD1 3,05 3,15 3,2
BE1 0,7 0,8 0,9
CA1 8,58 8,6 8,62
CB1 5,8 5,85 5,9
CC1 2,25
CD1 1,75
CE1 1,25
CF1 0,75
CG1 0,25
CH1 2,25
CI1 1,75
CJ1 1,25
CK1 0,75
CL1 0,25
CM1 7,2 7,3 7,4
CN1 0,65 0,65 0,7
DA1 R0,3 R0,4 R0,5
DB1 R0,1 R0,2 R0,3
DC1 R0,06 R0,1 R0,2
– 16 – IEC 61076-3-124:2019 © IEC 2019

Figure 3b – Fixed connector Type B

Table 3 – Dimensions for Figure 3b
Dimensions in millimetres
Letter Minimum Nominal Maximum
AA3 3,35 3,5 3,65
AB3 4,95 5,3 5,65
AC3 2,25 2,35 2,55
AD3 1,1 1,1 1,4
AE3 4,1 4,3 4,5
BA3 4,17 4,2 4,23
BB3 1,5 1,6 1,63
BC3 1,3 1,4 1,5
BD3 3,05 3,15 3,2
BE3 0,7 0,8 0,9
CA3 8,58 8,6 8,62
CB3 5,8 5,85 5,9
CC3 2,25
CD3 1,75
CE3 1,25
CF3 0,75
CG3 0,25
CH3 2,25
CI3 1,75
CJ3 1,25
CK3 0,75
CL3 0,25
CM3 7,2 7,3 7,4
CN3 0,65 0,65 0,7
DA3 R0,3 R0,4 R0,5
DB3 R0,1 R0,2 R0,3
DC3 R0,06 R0,1 R0,2
– 18 – IEC 61076-3-124:2019 © IEC 2019

Figure 3c – Fixed connector Type C
Figure 3 – Fixed connectors
Table 4 – Dimensions for Figure 3c
Dimensions in millimetres
Letter Minimum Nominal Maximum
AA7 3,35 3,5 3,65
AB7 4,95 5,3 5,65
AC7 2,25 2,35 2,55
AD7 1,1 1,1 1,4
AF7 0 0,1 0,4
BA7 4,17 4,2 4,23
BB7 1,5 1,6 1,63
BC7 1,3 1,4 1,5
BD7 3,05 3,15 3,2
BE7 0,7 0,8 0,9
CA7 8,58 8,6 8,62
CB7 5,8 5,85 5,9
CC7 2,25
CD7 1,75
CE7 1,25
CF7 0,75
CG7 0,25
CH7 2,25
CI7 1,75
CJ7 1,25
CK7 0,75
CL7 0,25
CM7 7,2 7,3 7,4
CN7 7,2 7,3 7,4
CO7 0,65 0,65 0,7
CQ7 2,2 2,3 2,4
CR7 4,6 4,7 4,8
DA7 R 0,3 R 0,4 R 0,5
DB7 R 0,1 R 0,2 R 0,2
DC7 R 0,66 R 0,1 R 0,2
– 20 – IEC 61076-3-124:2019 © IEC 2019
5.5 Free connector
Figure 4a – Free connector Type A

Table 5 – Dimensions for Figure 4a
Dimensions in millimetres
Letter Minimum Nominal Maximum
AA2 1,6 1,8 2
AB2 4,6 4,65 4,8
AC2 1,95 2,2 2,25
BA2 4,03 4,1 4,17
BB2 1,63 1,63 1,83
BD2 2,8 2,9 3
BE2 0,25 0,4 0,45
CA2 8,47 8,5 8,53
CB2 6,15 6,2 6,4
CC2 2,25
CD2 1,75
CE2 1,25
CF2 0,75
CG2 0,25
CH2 2,25
CI2 1,75
CJ2 1,25
CK2 0,75
CL2 0,25
CM2 7 7,1 7,2
CN2 0,3 0,35 0,35
CO2 0,35 0,5 0,65
DA2 R0,5 R0,5 R0,65
DB2 R0,15 R0,3 R0,3
– 22 – IEC 61076-3-124:2019 © IEC 2019

Figure 4b – Free connector Type B

Table 6 – Dimensions for Figure 4b
Dimensions in millimetres
Letter Minimum Nominal Maximum
AA4 1,6 1,8 2
AB4 4,6 4,65 4,8
AC4 1,95 2,2 2,25
BA4 4,03 4,1 4,17
BB4 1,63 1,63 1,83
BD4 2,8 2,9 3
BE4 0,25 0,4 0,45
CA4 8,47 8,5 8,53
CB4 6,15 6,2 6,4
CC4 2,25
CD4 1,75
CE4 1,25
CF4 0,75
CG4 0,25
CH4 2,25
CI4 1,75
CJ4 1,25
CK4 0,75
CL4 0,25
CM4 7 7,1 7,2
CN4 0,3 0,35 0,35
CO4 0,35 0,5 0,65
DA4 R0,5 R0,5 R0,65
DB4 R0,15 R0,3 R0,3
– 24 – IEC 61076-3-124:2019 © IEC 2019

Figure 4c – Free connector Type C
Figure 4 – Free connectors
Table 7 – Dimensions for Figure 4c
Dimensions in millimetres
Letter Minimum Nominal Maximum
AA8 1,6 1,8 2
AB8 4,6 4,65 4,8
AC8 1,95 2,2 2,25
AF8 0 0,1 0,4
BA8 4,03 4,1 4,17
BB8 1,63 1,63 1,83
BD8 2,8 2,9 3
BE8 0,25 0,4 0,45
BF8 5 5,2 5,3
CA8 8,47 8,5 8,53
CB8 6,15 6,2 6,4
CC8 2,25
CD8 1,75
CE8 1,25
CF8 0,75
CG8 0,25
CH8 2,25
CI8 1,75
CJ8 1,25
CK8 0,75
CL8 0,25
CM8 7 7,1 7,2
CN8 7 7,1 7,2
CO8 0,3 0,35 0,35
CQ8 2,4 2,5 2,6
CR8 4,8 4,9 4,9
DA8 R0,5 R0,5 R0,65
DB8 R0,15 R0,3 R0,3
5.6 Accessories
Not applicable.
5.7 Mounting information for connectors
Not applicable.
5.8 Gauges
Not applicable.
– 26 – IEC 61076-3-124:2019 © IEC 2019
6 Characteristics
6.1 General
Compliance to the test schedules shall ensure the reliability of all performance parameters,
over the range of operating climatic conditions given in this document. Stable and compliant
contact resistance is a good indication of the stability of transmission performance.
6.2 Pin and pair grouping assignment
For applications where pin and pair assignment are relevant, the pin and pair grouping
assignments shall be as shown in Figures 5a to 5f, unless otherwise specified.
The connectors Type A and Type C are defined for 10/100 Mbit/s and 1 / 2,5 / 5 / 10 Gbit/s
Ethernet communication.
The connector Type B is defined for all other non-Ethernet applications like signalling, serial or
other industrial bus communication systems.

Figure 5a – Fixed connector pin assignment for Type A, front view of connector

Figure 5b – Free connector pin assignment for Type A, front view of connector

Figure 5c – Fixed connector pin assignment for Type B, front view of connector

Figure 5d – Free connector pin assignment for Type B, front view of connector

Figure 5e – Fixed connector pin assignment for Type C, front view of connector

Figure 5f – Free connector pin assignment for Type C, front view of connector
Figure 5 – Connector pin assignment
Table 8 – Board connector pin assignment for 10/100 Mbit/s Ethernet
(Type A connectors of Figure 5a and Figure 5b and Type C connectors of Figure 5e and Figure 5f)
Pin No. Signal
1 TX+
2 TX-
N.C / (V )
EE
4 N.C
5 N.C
6 RX+
7 RX-
N.C / (V )
CC
9 N.C
10 N.C
– 28 – IEC 61076-3-124:2019 © IEC 2019
Table 9 – Board connector pin assignment for 1/10 Gbit/s Ethernet:
(Type A connectors of Figure 5a and Figure 5b and Type C connectors of Figure 5e and Figure 5f)
Pin No. Signal
1 BI_DA+
2 BI_DA-
GND / (V )
EE
4 BI_DC+
5 BI_DC-
6 BI_DB+
7 BI_DB-
GND / (V )
CC
9 BI_DD+
10 BI_DD-
Type B connectors, based on their differently intended use, do not use the pin assignments laid
out above for type A and type C connectors. All 10 ways may be used for signal in type B
connectors.
6.3 Classification into climatic category
The lowest and highest temperatures and the duration of the damp-heat steady-state test
should be selected from the preferred values stated in 2.3 of IEC 61076-1:2006. The connectors
are classified into climatic categories in accordance with the general rules given in IEC 60068-
1. The temperature range and severity of the damp heat, steady state test given in Table 8.
Table 10 – Climatic category
Climatic
Category temperature Damp heat steady state Days
category
Lower Upper Temperature Relative humidity
°C °C °C %
55/085/21 –55 +85 40 93 21
6.4 Electrical characteristics
6.4.1 Voltage rating
50 V a.c. and 60 V d.c.
6.4.2 Creepage and clearance distances
In general, for minimum values for clearance and creepage distances IEC 60664-1 shall apply,
based on an assigned voltage rating 50 V a.c. and 60 V d.c.
The creepage and clearance distances given in Table 11 apply for mated connectors.
However, the insulation coordination is not required for this connector; therefore the creepage
and clearance distance in IEC 60664-1 may be reduced and covered by overall performance
requirements, to the extent that the assigned voltage 50 V a.c. and 60 V d.c. is ensured in the
actual connector performance.
Furthermore, in practice, the reductions in creepage or clearance distances may occur due to
the conductive pattern of the printed board or the wiring used, and shall duly be taken into
account.
Table 11 – Creepage and clearance distances
Minimum distance between contacts and chassis Minimum distance between adjacent contacts
Creepage Clearance Creepage Clearance
mm mm mm mm
0,63 0,20 0,25 0,20
6.4.3 Voltage proof
Conditions:
IEC 60512-4-1, Test 4a, Method A
Standard atmospheric conditions
Mated connectors
All variants:
500 V d.c.; one contact to all other contacts connected together
500 V d.c.; all contacts connected together to shield.
6.4.4 Current-carrying capacity
Conditions:
IEC 60512-5-2, Test 5b
Standard atmospheric conditions
1,5 A (all pins)
Values at 40 °C
All contacts, connected in series with 0,13 mm (AWG 26/7 strands) wires.
The current-carrying capacity of connectors shall comply with the de-rating curve given in
Figure 6.
– 30 – IEC 61076-3-124:2019 © IEC 2019

Figure 6 – Derating diagram
6.4.5 Contact and shield resistance
Conditions:
The initial allowable contact resistance is 30 mΏ.
The maximum allowable contact resistance is 80 mΏ.
The maximum allowable shielding resistance is 100 mΏ.
6.4.6 Initial insulation resistance
Conditions:
IEC 60512-3-1, Test 3a
Standard atmospheric conditions
Method A
Mated connectors
Test voltage: 500 V d.c.
All types: 500 MΩ minimum.
6.4.7 Impedance
Conditions:
IEC 60512-25
...