IEC 60938-1:1999+AMD1:2006 CSV

INTERNATIONAL IEC
STANDARD 60938-1
QC 280000
Edition 2.1
2006-11
Edition 2:1999 consolidated with amendment 1:2006
Fixed inductors for electromagnetic
interference suppression –
Part 1:
Generic specification
Reference number
IEC 60938-1:1999+A1:2006(E)
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,

edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (http://www.iec.ch/searchpub/cur_fut.htm)
enables you to search by a variety of criteria including text searches, technical
committees and date of publication. On-line information is also available on
recently issued publications, withdrawn and replaced publications, as well as
corrigenda.
• IEC Just Published
This summary of recently issued publications (http://www.iec.ch/online_news/
justpub/jp_entry.htm) is also available by email. Please contact the Customer
Service Centre (see below) for further information.
• Customer Service Centre
If you have any questions regarding this publication or need further assistance,
please contact the Customer Service Centre:

Email: custserv@iec.ch
Tel: +41 22 919 02 11
Fax: +41 22 919 03 00
INTERNATIONAL IEC
STANDARD 60938-1
QC 280000
Edition 2.1
2006-11
Edition 2:1999 consolidated with amendment 1:2006
Fixed inductors for electromagnetic
interference suppression –
Part 1:
Generic 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
PRICE CODE
CL
Commission Electrotechnique Internationale

International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60938-1 © IEC:1999+A1:2006(E)

CONTENTS
FOREWORD.4

1 General.6

1.1 Scope.6

1.2 Normative references.6

2 Technical data .8

2.1 Units and symbols .8

2.2 Definitions.8

2.3 Preferred values .11
2.4 Marking.11
3 Quality assessment procedures .11
3.1 General.11
3.2 Primary stage of manufacture .11
3.3 Structurally similar inductors .11
3.4 Qualification approval procedures .11
3.5 Quality conformance inspection .12
3.6 Alternative test methods .12
3.7 Unchecked parameters.13
4 Test and measurement procedure.13
4.1 General.13
4.2 Standard atmospheric conditions .13
4.3 Drying.14
4.4 Visual examination and check of dimensions.14
4.5 Insulation resistance.16
4.6 Voltage proof.18
4.7 Inductance.21
4.8 Insertion loss .21
4.9 Robustness of terminations.21
4.10 Resistance to soldering heat.22
4.11 Solderability (applicable only for terminations intended to be soldered).23
4.12 Rapid change of temperature.23
4.13 Vibration.24
4.14 Bump.24
4.15 Shock.24

4.16 Container sealing.24
4.17 Climatic sequence .25
4.18 Damp heat, steady state .26
4.19 Temperature rise.26
4.20 Endurance.27
4.21 Passive flammability .27
4.22 Active flammability.28
4.23 Solvent resistance of marking .28
4.24 Component solvent resistance .28

60938-1 © IEC:1999+A1:2006(E) – 3 –

Annex A (normative) Interpretation of sampling plans and procedures as described

in IEC 60410 for use within the IEC quality assessment system

for electronic components (IECQ).29

Annex B (normative) Rules for the preparation of detail specifications for capacitors

and resistors for electronic equipment .30

Annex C (normative) Requirements for earth inductors.31

Figure 1 – Voltage proof test circuit .19

Table 1 – Reference test: standard atmospheric conditions .14

Table 2 – Creepage distances and clearances.15
Table 3 – Measuring voltage .16
Table 4 – Measuring points .17
Table 5 – Force.22
Table 6 – Torque.22
Table 7 – Number of cycles .26
Table 8 – Severities and requirements.28
Table C.1 – Rated current related to minimum cross-sectional area of copper lead (mm )
of the earth inductor .31

– 4 – 60938-1 © IEC:1999+A1:2006(E)

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FIXED INDUCTORS FOR ELECTROMAGNETIC

INTERFERENCE SUPPRESSION –
Part 1: Generic specification
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, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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 accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.

International Standard IEC 60938-1 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This consolidated version of IEC 60938-1 consists of the second edition (1999) [documents
40/1110/FDIS and 40/1136/RVD] and its amendment 1 (2006) [documents 40/1602/CDV and
40/1699A/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).

60938-1 © IEC:1999+A1:2006(E) – 5 –

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

The committee has decided that the contents of the base publ
...