IEC 62024-2:2020
(Main)High frequency inductive components - Electrical characteristics and measuring methods - Part 2: Rated current of inductors for DC-to-DC converters
High frequency inductive components - Electrical characteristics and measuring methods - Part 2: Rated current of inductors for DC-to-DC converters
IEC 62024-2:2020 specifies the measuring methods of the rated direct current limits for small inductors. Standardized measuring methods for the determination of ratings enable users to accurately compare the current ratings given in various manufacturers’ data books. This document is applicable to leaded and surface mount inductors with dimensions according to IEC 62025-1 and generally with rated current less than 22 A, although inductors with rated current greater than 22 A are available that fall within the dimension restrictions of this document (no larger than a 12 mm x 12 mm footprint approximately). These inductors are typically used in DC-to-DC converters built on PCBs, for electric and telecommunication equipment, and small size switching power supply units. The measuring methods are defined by the saturation and temperature rise limitations induced solely by direct current. This edition includes the following significant technical changes with respect to the previous edition:
- addition of Table 2 and Figure 2 b).
Composants inductifs à haute fréquence - Caractéristiques électriques et méthodes de mesure - Partie 2: Courant assigné des bobines d'induction pour des convertisseurs continu-continu
L'IEC 62024-2:2020 spécifie les méthodes de mesure des limites de courant continu assigné pour de petites bobines d'induction. Les méthodes de mesure normalisées pour la détermination des caractéristiques assignées permettent aux utilisateurs de comparer avec précision les caractéristiques assignées courantes figurant dans les différents recueils de données fabricants. Le présent document s'applique aux bobines d'induction à sorties et pour montage en surface dont les dimensions sont conformes à l'IEC 62025-1 et dont le courant assigné est généralement inférieur à 22 A, même si des bobines d'induction de courant assigné supérieur à 22 A sont disponibles et respectent les restrictions de dimensions de ce document (empreinte ne dépassant pas environ 12 mm x 12 mm). Ces bobines d'induction sont habituellement utilisées dans des convertisseurs continu-continu montés sur des cartes à circuit imprimé (CCI), pour des matériels électriques et de télécommunications, ainsi que pour des unités d'alimentation de puissance de commutation de petite taille. Les méthodes de mesure sont définies par les limites de saturation et d'échauffement induites uniquement par le courant continu. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout du Tableau 2 et de la Figure 2 b).
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IEC 62024-2 ®
Edition 2.0 2020-03
REDLINE VERSION
INTERNATIONAL
STANDARD
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High frequency inductive components – Electrical characteristics and measuring
methods –
Part 2: Rated current of inductors for DC-to-DC converters
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International Standards for all electrical, electronic and related technologies.
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IEC 62024-2 ®
Edition 2.0 2020-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
High frequency inductive components – Electrical characteristics and measuring
methods –
Part 2: Rated current of inductors for DC-to-DC converters
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-8136-9
– 2 – IEC 62024-2:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Standard atmospheric conditions . 7
4.1 Standard atmospheric conditions for testing . 7
4.2 Reference conditions . 7
5 Measuring method of DC saturation limited current . 7
5.1 General . 7
5.2 Test conditions . 7
5.3 Measurement Measuring circuit and calculation . 8
5.3.1 Measuring circuit . 8
5.3.2 Calculation . 8
5.4 Attachment jig of inductor . 9
5.5 Measuring method . 9
5.6 Quality conformance inspection . 9
6 Measuring method of temperature rise limited current. 9
6.1 General . 9
6.2 Test conditions . 10
6.3 Measurement Measuring jig . 10
6.3.1 General . 10
6.3.2 Printed-wiring board method . 10
6.3.3 Lead wire method . 13
6.4 Measuring method and calculation . 14
6.4.1 General . 14
6.4.2 Resistance substitution method . 14
6.4.3 Thermo-couple method . 15
6.5 Quality conformance inspection . 17
7 Determination of rated current . 17
8 Information to be given in the detail specification . 17
8.1 General . 17
8.2 Measuring method of DC saturation limited current . 17
8.3 Measuring method of temperature rise limited current . 17
Annex A (informative) Example of recommended description on product specification
sheets and catalogues . 18
Bibliography . 19
Figure 1 – Inductance measurement measuring circuit under application
of DC saturation condition . 8
Figure 2 – Example of printed-wiring boards . 13
Figure 3 – Temperature rise measurement measuring circuit by resistance substitution
method . 14
Figure 4 – Temperature rise measurement measuring circuit by thermo-couple method . 16
Table 1 – Width of circuits . 10
Table 2 – Circuit pattern width and thickness . 11
Table 3 – Wire size of circuits . 14
– 4 – IEC 62024-2:2020 RLV © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH FREQUENCY INDUCTIVE COMPONENTS –
ELECTRICAL CHARACTERISTICS AND MEASURING METHODS –
Part 2: Rated current of inductors for DC-to-DC converters
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
International Standard IEC 62024-2 has been prepared IEC technical committee 51: Magnetic
components, ferrite and magnetic powder materials.
This second edition cancels and replaces the first edition published in 2008. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of Table 2 and Figure 2 b).
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1303/CDV 51/1325/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 of IEC 62024 series, published under the general title High frequency
inductive components – Electrical characteristics and measuring methods can be found on the
IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 62024-2:2020 RLV © IEC 2020
HIGH FREQUENCY INDUCTIVE COMPONENTS –
ELECTRICAL CHARACTERISTICS AND MEASURING METHODS –
Part 2: Rated current of inductors for DC-to-DC converters
1 Scope
This part of IEC 62024 specifies the measuring methods of the rated direct current limits for
small inductors.
Standardized measuring methods for the determination of ratings enable users to accurately
compare the cu
...
IEC 62024-2 ®
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High frequency inductive components – Electrical characteristics and measuring
methods –
Part 2: Rated current of inductors for DC-to-DC converters
Composants inductifs à haute fréquence – Caractéristiques électriques et
méthodes de mesure –
Partie 2: Courant assigné des bobines d'induction pour des convertisseurs
continu-continu
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
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les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
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CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
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IEC 62024-2 ®
Edition 2.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High frequency inductive components – Electrical characteristics and
measuring methods –
Part 2: Rated current of inductors for DC-to-DC converters
Composants inductifs à haute fréquence – Caractéristiques électriques et
méthodes de mesure –
Partie 2: Courant assigné des bobines d'induction pour des convertisseurs
continu-continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-7995-3
– 2 – IEC 62024-2:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Standard atmospheric conditions . 6
4.1 Standard atmospheric conditions for testing . 6
4.2 Reference conditions . 6
5 Measuring method of DC saturation limited current . 6
5.1 General . 6
5.2 Test conditions . 6
5.3 Measuring circuit and calculation . 7
5.3.1 Measuring circuit . 7
5.3.2 Calculation . 7
5.4 Attachment jig of inductor . 8
5.5 Measuring method . 8
5.6 Quality conformance inspection . 8
6 Measuring method of temperature rise limited current. 8
6.1 General . 8
6.2 Test conditions . 9
6.3 Measuring jig . 9
6.3.1 General . 9
6.3.2 Printed-wiring board method . 9
6.3.3 Lead wire method . 12
6.4 Measuring method and calculation . 12
6.4.1 General . 12
6.4.2 Resistance substitution method . 12
6.4.3 Thermo-couple method . 14
6.5 Quality conformance inspection . 15
7 Determination of rated current . 15
8 Information to be given in the detail specification . 15
8.1 General . 15
8.2 Measuring method of DC saturation limited current . 15
8.3 Measuring method of temperature rise limited current . 15
Annex A (informative) Example of recommended description on product specification
sheets and catalogues . 16
Bibliography . 17
Figure 1 – Inductance measuring circuit under application of DC saturation condition . 7
Figure 2 – Example of printed-wiring boards . 12
Figure 3 – Temperature rise measuring circuit by resistance substitution method . 13
Figure 4 – Temperature rise measuring circuit by thermo-couple method . 14
Table 1 – Width of circuits . 9
Table 2 – Circuit pattern width and thickness . 10
Table 3 – Wire size of circuits . 12
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH FREQUENCY INDUCTIVE COMPONENTS –
ELECTRICAL CHARACTERISTICS AND MEASURING METHODS –
Part 2: Rated current of inductors for DC-to-DC converters
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 re
...
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