IEC 60938-2:1999+AMD1:2006 CSV

INTERNATIONAL IEC
STANDARD 60938-2
QC 280100
Edition 2.1
2006-11
Edition 2:1999 consolidated with amendment 1:2006
Fixed inductors for electromagnetic
interference suppression –
Part 2:
Sectional specification
Reference number
IEC 60938-2:1999+A1:2006(E)
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INTERNATIONAL IEC
STANDARD 60938-2
QC 280100
Edition 2.1
2006-11
Edition 2:1999 consolidated with amendment 1:2006
Fixed inductors for electromagnetic
interference suppression –
Part 2:
Sectional specification
© IEC 2006 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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Commission Electrotechnique Internationale

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60938-2 © IEC:1999+A1:2006(E)

CONTENTS
FOREWORD.4

1 General .6

1.1 Scope.6

1.2 Object .6

1.3 Normative references .6

1.4 Information to be given in a detail specification .7

1.5 Definitions .8

1.6 Marking .8

2 Preferred ratings and characteristics.8
2.1 Climatic categories .8
2.2 Values of ratings.9
3 Quality assessment procedures .9
3.1 Primary stage of manufacture .9
3.2 Structurally similar inductors .9
3.3 Certified records of released lots .10
3.4 Qualification approval .10
3.5 Quality conformance inspection .14
4 Test and measurement procedures .14
4.1 Visual examination and check of dimensions.14
4.2 Voltage proof.15
4.3 Insulation resistance.15
4.4 Inductance.16
4.5 DC line resistance .16
4.6 Robustness of terminations.16
4.7 Resistance to soldering heat.16
4.8 Solderability.16
4.9 Rapid change of temperature.16
4.10 Vibration.17
4.11 Bump .17
4.12 Shock.18
4.13 Container sealing.18
4.14 Climatic sequence .18
4.15 Damp heat, steady state .19
4.16 Temperature rise (applies only to inductors with a mass >5 g).19
4.17 Impulse voltage (applies to inductors with more than one winding) .20

4.18 Endurance.21
4.19 Passive flammability (if applicable) .22
4.20 Component solvent resistance (if applicable) .22
4.21 Solvent resistance of marking (if applicable) .22

Annex A (normative) Test schedule for safety tests only approval.23
Annex B (normative) Test schedule for safety tests and performance tests
for qualification approval, assessment level D .26
Annex C (normative) Example of a suitable circuit for the endurance test voltage .31
Annex D (normative) Declaration of design (confidential to the manufacturer
and the certification body) .32
Annex E (normative) Test methods for thyristor electromagnetic
interference suppression inductors .33

60938-2 © IEC:1999+A1:2006(E) – 3 –

Figure C.1 – Endurance test circuit.31

Figure E.1 – Test circuit for temperature rise.33

Figure E. 2 – Test circuit for interference voltage attenuation.34

Table 1 – Sampling plan for safety tests only.12

Table 2 – Sampling plan for safety tests and performance tests, assessment level D .13

Table 3 – Measuring points .15

Table 4 – Acceleration.17

Table 5 – Sweep cycles.17
Table 6 – Preferred severities .18

– 4 – 60938-2 © IEC:1999+A1:2006(E)

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FIXED INDUCTORS FOR ELECTROMAGNETIC

INTERFERENCE SUPPRESSION –
Part 2: Sectional specification

FOREWORD
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International Standard IEC 60938-2 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This consolidated version of IEC 60938-2 consists of the second edition (1999) [documents
40/1111/FDIS and 40/1137/RVD] and its amendment 1 (2006) [documents 40/1603/CDV and
40/1700A/RVC].
The technical content is therefore identical to the base edition and its amendment and has
been prepared for user convenience.
It bears the edition number 2.1.
A vertical line in the margin shows where the base publication has been modified by
amendment 1.
The QC number that appears on the front cover of this publication is the specification number
in the IEC Quality Assessment System for Electronic Components (IECQ).

60938-2 © IEC:1999+A1:2006(E) – 5 –

Annexes A, B, C, D and E form an integral part of this standard.

The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result 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.
...