IEC 60938-2:1999

Fixed inductors for electromagnetic interference suppression - Part 2: Sectional specification

IEC 60938-2:1999, applies to fixed inductors designed for electromagnetic interference suppression and which fall within the scope of the generic specification, IEC 60938-1. It is restricted to fixed inductors for which safety tests are appropriate. This implies that inductors specified according to this specification will either be connected to mains supplies, when compliance with the mandatory tests of Table 1 is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required. This second edition cancels and replaces the first edition published in 1988.

Inductances fixes d'antiparasitage - Partie 2: Spécification intermédiaire

La CEI 60938-2:1999, s'applique à des inductances fixes conçues pour s'opposer aux perturbations électromagnétiques et s'inscrivant dans le domaine d'application de la spécification générique CEI 60938-1. Elle se limite à des inductances fixes pour lesquelles des essais de sécurité sont souhaitables. Cela signifie que les inductances décrites conformément à la présente spécification seront, soit reliées à l'alimentation secteur, auquel cas les essais obligatoires du Tableau 1 sont exigés, soit utilisées en d'autres positions du circuit pour lesquelles la spécification applicable à l'équipement indique que certains ou l'ensemble de ces essais de sécurité sont exigés. Cette deuxième édition annule et remplace la première édition parue en 1988.

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: 20-Jul-2021

Relations

• Amended By: IEC 60938-2:1999/AMD1:2006 - Amendment 1 - Fixed inductors for electromagnetic interference suppression - Part 2: Sectional specification
• Effective Date: 05-Sep-2023
• Revised: IEC 60938-2:2021 - Fixed inductors for electromagnetic interference suppression - Part 2: Sectional specification on power line chokes
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
60938-2
QC 280100
Second edition
1999-11
Fixed inductors for electromagnetic
interference suppression –
Part 2:
Sectional specification
Inductances fixes d'antiparasitage –
Partie 2:
Spécification intermédiaire
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
60938-2
QC 280100
Second edition
1999-11
Fixed inductors for electromagnetic
interference suppression –
Part 2:
Sectional specification
Inductances fixes d'antiparasitage –
Partie 2:
Spécification intermédiaire
 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 – 60938-2 © IEC:1999(E)
CONTENTS
Page
FOREWORD . 3

Clause
1 General.5

1.1 Scope.5

1.2 Object. 5

1.3 Normative references.5

1.4 Information to be given in a detail specification. 6
1.5 Definitions.7
1.6 Marking.7
2 Preferred ratings and characteristics . 7
2.1 Climatic categories.7
2.2 Values of ratings . 8
3 Quality assessment procedures. 8
3.1 Primary stage of manufacture. 8
3.2 Structurally similar inductors . 8
3.3 Certified records of released lots. 9
3.4 Qualification approval.9
3.5 Quality conformance inspection. 13
4 Test and measurement procedures . 13
4.1 Visual examination and check of dimensions . 13
4.2 Voltage proof.14
4.3 Insulation resistance.14
4.4 Inductance.15
4.5 DC line resistance. 15
4.6 Robustness of terminations . 15
4.7 Resistance to soldering heat . 15
4.8 Solderability.15
4.9 Rapid change of temperature . 15
4.10 Vibration.16
4.11 Bump.16
4.12 Shock.17
4.13 Container sealing.17
4.14 Climatic sequence.17

4.15 Damp heat, steady state. 18
4.16 Temperature rise (applies only to inductors with a mass >5 g) . 18
4.17 Impulse voltage (applies to inductors with more than one winding). 19
4.18 Endurance.20
4.19 Passive flammability (if applicable) . 21
4.20 Component solvent resistance (if applicable) . 21
4.21 Solvent resistance of marking (if applicable). 21
Annex A (normative) Test schedule for safety tests only approval. 22
Annex B (normative) Test schedule for safety tests and performance tests for qualification
approval, assessment level D . 25
Annex C (normative) Example of a suitable circuit for the endurance test voltage . 29
Annex D (normative) Declaration of design (confidential to the manufacturer and the
certification body) . 30

60938-2 © IEC:1999(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FIXED INDUCTORS FOR ELECTROMAGNETIC

INTERFERENCE SUPPRESSION –
Part 2: Sectional 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 60938-2 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.
The text of this standard is based on the following documents:
FDIS Report on voting
40/1111/FDIS 40/1137/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, C and D form an integral part of this standard.

– 4 – 60938-2 © IEC:1999(E)
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.

60938-2 © IEC:1999(E) – 5 –
FIXED INDUCTORS FOR ELECTROMAGNETIC

INTERFERENCE SUPPRESSION –
Part 2: Sectional specification

1 General
1.1 Scope
This International Standard applies to fixed inductors designed for electromagnetic interference
suppression and which fall within the scope of the generic specification, IEC 60938-1. It is
restricted to fixed inductors for which safety tests are appropriate. This implies that inductors
specified according to this specification will either be connected to mains supplies, when
compliance with the mandatory tests of table 1 is necessary, or used in other circuit positions
where the equipment specification prescribes that some or all of these safety tests are required.
This standard applies to fixed inductors which will be connected to an a.c. mains or other
supply with a nominal voltage not exceeding 1 000 V a.c. (r.m.s.) or d.c. between conductors
and with a nominal frequency not exceeding 400 Hz.
1.2 Object
The object of this standard is to prescribe standard requirements for safety tests and standard
ratings and characteristics, to select from IEC 60938-1 the appropriate methods of test and to
give general performance requirements for suppression inductors. Test severities and
performance requirements prescribed in detail specifications referring to this sectional
specification shall be of equal or higher performance level. In addition, the minimum require-
ments for safety tests specified herein always apply.
1.3 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 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test requirements

IEC 60063:1963, Preferred number series for resistors and capacitors
Amendment 1 (1967)
Amendment 2 (1977)
IEC 60085:1984, Thermal evaluation and classification of electrical insulation
IEC 60279:1969, Measurement of the winding resistance of an a.c. machine during operation at
alternative voltage
IEC 60938-1:1999, Fixed inductors for electromagnetic interference suppression – Part 1:
Generic specification
ISO 3:1973, Preferred numbers – Series of preferred numbers

– 6 – 60938-2 © IEC:1999(E)
1.4 Information to be given in a detail specification

1.4.1 General
Detail specifications shall be derived from the relevant blank detail specification.

Detail specificatio
...

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
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
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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: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
CN
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
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
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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 60938-2 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 p
...

IEC 60938-2
Edition 2.0 1999-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280100
Fixed inductors for electromagnetic interference suppression –
Part 2: Sectional specification

Inductances fixes d'antiparasitage –
Partie 2: Spécification intermédiaire

Copyright © 1999 IEC, Geneva, Switzerland

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IEC 60938-2
Edition 2.0 1999-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
QC 280100
Fixed inductors for electromagnetic interference suppression –
Part 2: Sectional specification

Inductances fixes d'antiparasitage –
Partie 2: Spécification intermédiaire

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 29.100.10; 31.020 ISBN 2-8318-9906-0
– 2 – 60938-2 © IEC:1999
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
1.4.1 General .7
1.4.2 Outline drawing and dimensions.7
1.4.3 Mounting.8
1.4.4 Ratings and characteristics .8
1.4.5 Marking .8
1.5 Definitions .8
1.6 Marking .8
2 Preferred ratings and characteristics.9
2.1 Climatic categories .9
2.2 Values of ratings.9
2.2.1 Rated inductance and tolerance .9
2.2.2 Rated voltage (U ).9
R
2.2.3 Category voltage (U ) .9
C
2.2.4 Rated temperature.9
2.2.5 Rated current.9
2.2.6 Passive flammability .9
3 Quality assessment procedures .10
3.1 Primary stage of manufacture .10
3.2 Structurally similar inductors .10
3.3 Certified records of released lots .10
3.4 Qualification approval .10
3.4.1 Qualification approval on the basis of the fixed sample size
procedures .10
3.5 Quality conformance inspection .13
3.5.1 Formation of inspection lots .13
3.5.2 Test schedule .14
3.5.3 Delayed delivery .14
4 Test and measurement procedures .14
4.1 Visual examination and check of dimensions.14
4.1.1 Dimensions (gauging) .14
4.1.2 Dimensions (detail) .14
4.2 Voltage proof.14
4.3 Insulation resistance.15
4.4 Inductance.15
4.5 DC line resistance .15
4.6 Robustness of terminations.16
4.7 Resistance to soldering heat.16
4.7.1 Conditions .16
4.7.2 Final inspection, measurements and requirements .16
4.8 Solderability.16
4.9 Rapid change of temperature.16

60938-2 © IEC:1999 – 3 –
4.10 Vibration.16
4.11 Bump .17
4.12 Shock.17
4.13 Container sealing.18
4.14 Climatic sequence .18
4.14.1 Initial measurements.18
4.14.2 Dry heat.18
4.14.3 Damp heat, cyclic, test Db, first cycle .18
4.14.4 Cold.18
4.14.5 Low air pressure .18
4.14.6 Damp heat, cyclic, test Db, remaining cycles .18
4.14.7 Final inspection, measurements and requirements .19
4.15 Damp heat, steady state .19
4.15.1 Final inspection, measurements and requirements .19
4.16 Temperature rise (applies only to inductors with a mass > 5 g).19
4.16.1 Test method .19
4.16.2 Requirements .20
4.17 Impulse voltage (applies to inductors with more than one winding) .20
4.17.1 Initial measurements.20
4.17.2 Requirements .20
4.18 Endurance.20
4.18.1 Test conditions – Endurance current test.20
4.18.2 Test conditions – Endurance voltage test between terminations
(applies to inductors with more than one winding).21
4.19 Passive flammability (if applicable) .21
4.20 Component solvent resistance (if applicable) .21
4.21 Solvent resistance of marking (if applicable) .21
Annex A (normative) Test schedule for safety tests only approval .22
Annex B (normative) Test schedule for safety tests and performance tests for
qualification approval, assessment level D.25
Annex C (normative) Example of a suitable circuit for the endurance test voltage.30
Annex D (normative) Declaration of design (confidential to the manufacturer and the
certification body).31
Annex E (normative) Test methods for thyristor electromagnetic interference
suppression inductors .
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