IEC 60938-1:1999

Fixed inductors for electromagnetic interference suppression - Part 1: Generic specification

IEC 60938-1:1999, applies to inductors designed for electromagnetic interference suppression intended for use within, or associated with, electronic or electrical equipment and machines. It is restricted to inductors for which safety tests are appropriate. This second edition cancels and replaces the first edition published in 1988 and constitutes a minor revision related to tables, figures and references. It also includes Amendment 1 (2006).

Inductances fixes d'antiparasitage - Partie 1: Spécification générique

La CEI 60938-1:1999, s'applique à des inductances conçues pour s'opposer aux perturbations électromagnétiques et destinées à être utilisées dans ou en association avec du matériel et des machines électroniques ou électriques. Elle se limite à des inductances pour lesquelles des essais de sécurité sont souhaitables. Cette deuxième édition annule et remplace la première édition parue en 1988, et constitue une révision mineure, ayant trait aux tableaux, figures et références. Elle inclut également l'Amendement 1 (2006).

General Information

• Status: Published
• Publication Date: 27-Nov-2006
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.100.10 - Magnetic components
• ICS: 31.020 - Electronic components in general
• Technical Committee: TC 40 - Capacitors and resistors for electronic equipment
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 16-Jun-2021

Relations

• Amended By: IEC 60938-1:1999/AMD1:2006 - Amendment 1 - Fixed inductors for electromagnetic interference suppression - Part 1: Generic specification
• Effective Date: 05-Sep-2023
• Revised: IEC 60938-1:2021 - Fixed inductors for electromagnetic interference suppression - Part 1: Generic specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
60938-1
QC 280000
Second edition
1999-10
Fixed inductors for electromagnetic
interference suppression –
Part 1:
Generic specification
Inductances fixes d'antiparasitage –
Partie 1:
Spécification générique
Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are

available. 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.

Validity of this publication
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 the date of the reconfirmation of the publication is available
in the IEC catalogue.
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 to be found at the following IEC sources:
• IEC web site*
•
Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International
Electrotechnical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60617: Graphical symbols
for diagrams.
* See web site address on title page.

INTERNATIONAL IEC
STANDARD
60938-1
QC 280000
Second edition
1999-10
Fixed inductors for electromagnetic
interference suppression –
Part 1:
Generic specification
Inductances fixes d'antiparasitage –
Partie 1:
Spécification générique
 IEC 1999  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 Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
P
International Electrotechnical Commission
For price, see current catalogue

– 2 – 60938-1 © IEC:1999(E)
CONTENTS
Page
FOREWORD . 4

Clause
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. 10
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 . 15
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(E) – 3 –
Page
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

– 4 – 60938-1 © IEC:1999(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FIXED INDUCTORS FOR ELECTROMAGNETIC

INTERFERENCE SUPPRESSION –
Part 1: Generic specification
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The 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 second edition cancels and replaces the first edition published in 1988 and constitutes a
technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
40/1110/FDIS 40/1136/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
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).
Annexes A, B and C form an integral part of this standard.

60938-1 © IEC:1999(E) – 5 –
The committee has decided that this publication remains valid until 2005.

At this date, in accordance with the committee’s decision, 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.

– 6 – 60938-1 © IEC:1999(E)
FIXED INDUCTORS FOR ELECTROMAGNETIC

INTERFERENCE SUPPRESSION –
Part 1: Generic specification
1 General
1.1 Scope
This International Standard applies to inductors designed for electromagnetic interference
suppression intended for use within, or associated with, electronic or electrical equipment and
machines. It is restricted to inductors for which safety tests are appropriate.
The combination of two or more inductors within one enclosure is also included.
Inductors within the scope of this standard may also be used to protect apparatus and
machines from electrical noise and voltage or current transients coming from either the supply
or from other parts of the apparatus.
This standard does not necessarily apply in its entirety to inductors intended for use on motor
vehicles, in aircraft or for marine applications.
1.2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. For dated references, subsequent amendments
to, or revisions of, any of these publications do not apply. However, parties to agreements
based on this International Standard are encouraged to investigate the possibility of applying
the most recent editions of the normative documents indicated below. For undated references,
the latest edition of the normative document referred to applies. Members of IEC and ISO
maintain registers of currently valid International Standards.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV)
IEC 60062:1992, Marking codes for resistors and capacitors
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance

Amendment 1 (1992)
IEC 60068-2-1:1990, Environmental testing – Part 2: Tests – Tests A: Cold
Amendment 1 (1993)
Amendment 2 (1994)
IEC 60068-2-2:1974, Environmental testing – Part 2: Tests – Tests B: Dry Heat
Amendment 1 (1993)
Amendment 2 (1994)
IEC 60068-2-3:1969, Environmental testing – Part 2: Tests – Test Ca: Damp heat, steady state
Amendment 1 (1984)
IEC 60068-2-6:1995, Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)

60938-1 © IEC:1999(E) – 7 –
IEC 60068-2-13:1983, Environmental testing – Part 2: Tests – Test M: Low air pressure

IEC 60068-2-14:1984, E
...

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
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
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• IEC Just Published
This summary of recently issued publications (http://www.iec.ch/online_news/
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If you have any questions regarding this publication or need further assistance,
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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: [phone] Telefax: [phone] E-mail: [e-mail] 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 t
...

IEC 60938-1
Edition 2.0 1999-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280000
Fixed inductors for electromagnetic interference suppression –
Part 1: Generic specification
Inductances fixes d'antiparasitage –
Partie 1: Spécification générique

Copyright © 1999 IEC, Geneva, Switzerland

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IEC 60938-1
Edition 2.0 1999-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280000
Fixed inductors for electromagnetic interference suppression –
Part 1: Generic specification
Inductances fixes d'antiparasitage –
Partie 1: Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 29.100.10; 31.020 ISBN 2-8318-9863-3
– 2 – 60938-1 © IEC:1999
CONTENTS
FOREWORD.5
1 General .7
1.1 Scope.7
1.2 Normative references .7
2 Technical data .9
2.1 Units and symbols .9
2.2 Definitions .9
2.3 Preferred values .11
2.4 Marking .11
2.4.1 General .11
2.4.2 Coding.12
3 Quality assessment procedures .12
3.1 General .12
3.2 Primary stage of manufacture .12
3.3 Structurally similar inductors .12
3.4 Qualification approval procedures .12
3.4.1 Eligibility for qualification approval.12
3.4.2 Application for qualification approval .12
3.4.3 Test procedure for qualification approval.12
3.4.4 Granting of qualification approval .12
3.4.5 Maintenance of qualification approval.13
3.5 Quality conformance inspection .13
3.5.1 Certified test records of released lots .13
3.5.2 Delayed delivery .13
3.5.3 Release for delivery before the completion of group B tests.13
3.6 Alternative test methods .13
3.7 Unchecked parameters.13
4 Test and measurement procedure.14
4.1 General .14
4.2 Standard atmospheric conditions .14
4.2.1 Standard atmospheric conditions for testing .14
4.2.2 Recovery conditions.14
4.2.3 Referee conditions.14
4.2.4 Reference conditions .15
4.3 Drying.15
4.4 Visual examination and check of dimensions.15
4.4.1 Visual examination.15
4.4.2 Dimensions (gauging) .15
4.4.3 Dimensions (detail) .15
4.4.4 Creepage distances and clearances.15
4.5 Insulation resistance.16
4.6 Voltage proof.19
4.6.1 Test circuit (for the test between terminations) .19
4.6.2 Test.20
4.6.3 Requirements .22
4.7 Inductance.22
4.8 Insertion loss .22

60938-1 © IEC:1999 – 3–
4.9 Robustness of terminations.22
4.9.1 Test Ua – Tensile .22
4.9.2 Test Ub – Bending (first half of the sample).23
4.9.3 Test Uc – Torsion (second half of the sample).23
4.9.4 Test Ud – Torque (for terminations with threaded studs or screws and
for integral mounting devices) .23
4.9.5 Visual examination.23
4.10 Resistance to soldering heat.23
4.11 Solderability (applicable only for terminations intended to be soldered).24
4.12 Rapid change of temperature.24
4.13 Vibration.25
4.14 Bump .25
4.15 Shock.25
4.16 Container sealing.25
4.17 Climatic sequence .25
4.17.1 Initial measurements.26
4.17.2 Dry heat.26
4.17.3 Damp heat, cyclic, test Db, first cycle .26
4.17.4 Cold.26
4.17.5 Low air pressure .26
4.17.6 Damp heat, cyclic, test Db, remaining cycles .27
4.17.7 Final measurements .27
4.18 Damp heat, steady state .27
4.19 Temperature rise .27
4.20 Endurance.28
4.21 Passive flammability .28
4.22 Active flammability.29
4.23 Solvent resistance of marking .29
4.24 Component solvent resistance .29
4.24.1 Initial measurements.29
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) .30
Annex B (normative) Rules for the preparation of detail specifications for capacitors
and resistors
...