IEC 61191-4:2017

IEC 61191-4 ®
Edition 2.0 2017-07
INTERNATIONAL
STANDARD
Printed board assemblies –
Part 4: Sectional specification – Requirements for terminal soldered assemblies
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IEC 61191-4 ®
Edition 2.0 2017-07
INTERNATIONAL
STANDARD
Printed board assemblies –
Part 4: Sectional specification – Requirements for terminal soldered assemblies

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.240 ISBN 978-2-8322-4657-3

– 2 – IEC 61191-4:2017 © IEC 2017

CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 General requirements . 6
5 General terminal and part mounting requirements. 6
5.1 General . 6
5.2 Wire and cable preparation . 7
5.2.1 General . 7
5.2.2 Tinning of stranded wire . 7
5.3 Terminal installation . 7
5.3.1 General . 7
5.3.2 Terminal mounting (mechanical) . 7
5.3.3 Terminal shank discontinuities . 8
5.3.4 Flange discontinuities . 8
5.3.5 Terminal mounting (electrical) . 8
5.3.6 Flange angles . 9
5.3.7 Shank discontinuities . 9
5.3.8 Flared flange discontinuities . 9
5.4 Mounting to terminals . 10
5.4.1 General . 10
5.4.2 Wire and lead wrap-around . 10
5.4.3 Side route connection . 10
5.4.4 Top and bottom route connection . 11
5.4.5 Continuous runs . 12
5.4.6 Service loops . 13
5.4.7 Insulation clearance . 13
5.4.8 Orientation of wire wrap . 14
5.4.9 Stress relief . 14
5.4.10 Pierced or perforated terminals . 14
5.4.11 Cup and hollow cylindrical terminal soldering . 15
6 Acceptance requirements . 16
6.1 General . 16
6.2 Control and corrective actions . 16
6.3 Terminal soldering . 16
6.3.1 General . 16
6.3.2 Wire-terminal attachment . 16
6.4 Part marking and reference designations . 16
7 Rework of unsatisfactory soldered connections. 16
Bibliography . 18

Figure 1 – Rolled flange terminal . 8
Figure 2 – Rolled flange discontinuities . 8
Figure 3 – Flared flange terminals. 9
Figure 4 – Flared angles . 9

Figure 5 – Wire and lead wrap around . 10
Figure 6 – Side route connections and wrap on bifurcated terminal . 11
Figure 7 – Top and bottom route terminal connection . 12
Figure 8 – Continuous run wire wraps . 13
Figure 9 – Service loop for lead wiring . 13
Figure 10 – Insulation clearance measurement (c) . 14
Figure 11 – Stress relief examples . 14
Figure 12 – Pierced or perforated terminal wire wrap . 15

Table 1 – Nicked or broken strand limits . 7
Table 2 – Plated through-holes with terminals, minimum acceptance conditions . 16
Table 3 – Defects for terminal attachment and soldering defects . 17

– 4 – IEC 61191-4:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PRINTED BOARD ASSEMBLIES –
Part 4: Sectional specification –
Requirements for terminal soldered assemblies

FOREWORD
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International Standard IEC 61191-4 has been prepared by IEC technical committee 91:
Electronics assembly technology.
This second edition cancels and replaces the first edition published in 1998. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• The requirements have been updated to be compliant with the acceptance criteria in
IPC-A-610F.
The text of this International Standard is based on the following documents:
CDV Report on voting
91/1399/CDV 91/1434/RVC
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.
A list of all parts in the IEC 61191 series, published under the general title Printed board
assemblies, can be found on the IEC website.
The com
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