IEC 63171-4:2022

IEC 63171-4 ®
Edition 1.0 2022-09
INTERNATIONAL
STANDARD
colour
inside
Connectors for electrical and electronic equipment –
Part 4: Detail specification for shielded or unshielded, free and fixed connectors
with up to 8 ways for balanced single-pair data transmission with current
carrying capacity – Mechanical mating information, pin assignment and
additional requirements for Type 4
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IEC 63171-4 ®
Edition 1.0 2022-08
INTERNATIONAL
STANDARD
colour
inside
Connectors for electrical and electronic equipment –

Part 4: Detail specification for shielded or unshielded, free and fixed connectors

with up to 8 ways for balanced single-pair data transmission with current

carrying capacity – Mechanical mating information, pin assignment and

additional requirements for Type 4

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.220.10 ISBN 978-2-8322-5608-4

– 2 – IEC 63171-4:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
4 Common features and typical connector pairs . 11
4.1 Mating information . 11
4.1.1 General . 11
4.1.2 Overview of connector styles . 11
4.1.3 Fixed connectors . 12
4.1.4 Free connectors . 15
5 Characteristics . 21
5.1 General . 21
5.2 Pin assignment . 21
5.3 Classification into climatic category . 22
5.4 Electrical characteristics . 22
5.4.1 Creepage and clearance distances . 22
5.4.2 Voltage proof . 23
5.4.3 Current-temperature derating . 23
5.4.4 Initial contact resistance – interface only (separable fixed and free
contact) . 23
5.4.5 Input to output DC resistance . 23
5.4.6 Input to output DC resistance unbalanced. 23
5.4.7 Initial insulation resistance . 23
5.5 Transmission characteristics . 23
5.5.1 General . 23
5.5.2 Insertion loss . 23
5.5.3 Return loss . 23
5.5.4 Propagation delay . 23
5.5.5 Transverse conversion loss . 24
5.5.6 Transverse conversion transfer loss . 24
5.5.7 Transfer impedance (shielded only) . 24
5.5.8 Coupling attenuation . 24
5.5.9 Power sum alien (exogenous) NEXT . 24
5.5.10 Power sum alien (exogenous) FEXT . 24
5.6 Mechanical characteristics . 24
5.6.1 Mechanical operation . 24
5.6.2 Effectiveness of connector coupling devices . 24
5.6.3 Insertion and withdrawal forces . 24
6 Tests and test schedule . 24
6.1 General . 24
6.2 Arrangement for contact resistance measurement . 25
6.3 Arrangement for vibration test . 25
6.4 Test procedures and measuring methods . 26
6.5 Preconditioning . 26
6.6 Test schedules . 26

6.6.1 General . 26
6.6.2 Basic (minimum) test schedule . 26
6.6.3 Full test schedule . 26
Bibliography . 27

Figure 1 – Relationship between the IEC 63171 series documents and their related
references . 7
Figure 2 – Type 4 connector overview . 9
Figure 3 – Shielded and unshielded fixed connector details – MMC 1P . 12
Figure 4 – Shielded and unshielded fixed connector details – MMC 2P . 13
Figure 5 – Shielded and unshielded fixed connector details – MMC 4P . 14
Figure 6 – Shielded and unshielded free connector with snap-in device – MMC 1PS . 15
Figure 7 – Shielded and unshielded free connector with locking device – MMC 1PL . 17
Figure 8 – Shielded and unshielded free connector with snap-in device – MMC 2PS . 18
Figure 9 – Shielded and unshielded free connector with locking device- MMC 2PL . 19
Figure 10 – Shielded and unshielded free connector with snap-in device – MMC 4PS . 19
Figure 11 – Shielded and unshielded free connector with locking device- MMC 4PL . 20
Figure 12 – Free connector female contact . 21
Figure 13 – Fixed connector pin assignment (front view of connector). 22
Figure 14 – Arrangement for contact resistance test . 25
Figure 15 – Arrangement for vibration test . 26

Table 1 – Styles of connectors . 12
Table 2 – Dimensions for Figure 3 – MMC 1P . 13
Table 3 – Dimensions for Figure 4 – MMC 2P . 14
Table 4 – Dimensions for Figure 5 – MMC 4P . 15
Table 5 – Dimensions for Figure 6 – MMC 1PS . 16
Table 6 – Dimensions for Figure 7 – MMC 1PL . 17
Table 7 – Dimensions for Figure 8 – MMC 2PS . 18
Table 8 – Dimensions for Figure 9 – MMC 2PL . 19
Table 9 – Dimensions for Figure 10 – MMC 4PS . 20
Table 10 – Dimensions for Figure 11 – MMC 4PL . 20
Table 11 – Dimensions for Figure 12. 21
Table 12 – 2-way connector signal pin assignment . 22
Table 13 – Creepage and clearance distances . 23

– 4 – IEC 63171-4:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR ELECTRICAL AND ELECTRONIC EQUIPMENT –

Part 4: Detail specification for shielded or unshielded, free and fixed
connectors with up to 8 ways for balanced single-pair data transmission
with current carrying capacity – Mechanical mating information, pin
assignment and additional requirements for Type 4

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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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consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepte
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