IEC 61605:2016

Fixed inductors for use in electronic and telecommunication equipment - Marking codes

IEC 61605:2016 specifies marking codes for fixed inductors. It covers the inductance values and their tolerances as well as dates. This edition includes the following significant technical changes with respect to the previous edition:
a) The date code system for fixed inductors has been updated.

Inductances fixes utilisées dans les équipements électroniques et de télécommunications - Codes de marquage

L'IEC 61605:2016 spécifie les codes de marquage applicables aux inductances fixes. Il couvre les valeurs d'inductance et leurs tolérances ainsi que les dates. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) Le système de codage de la date de fabrication des inductances fixes a été mis à jour.

General Information

• Status: Published
• Publication Date: 25-Oct-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.100.10 - Magnetic components
• ICS: 33.180.30 - Optic amplifiers
• Technical Committee: TC 51 - Magnetic components, ferrite and magnetic powder materials
• Drafting Committee: WG 9 - TC 51/WG 9
• Current Stage: PPUB - Publication issued
• Start Date: 15-Feb-2017
• Completion Date: 26-Oct-2016

Relations

• Revises: IEC 61605:2005 - Fixed inductors for use in electronic and telecommunication equipment - Marking codes
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61605 ®
Edition 3.0 2016-10
INTERNATIONAL
STANDARD
Fixed inductors for use in electronic and telecommunication equipment –
Marking codes
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
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IEC 61605 ®
Edition 3.0 2016-10
INTERNATIONAL
STANDARD
Fixed inductors for use in electronic and telecommunication equipment –

Marking codes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-3694-9

– 2 – IEC 61605:2016 © IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Colour code for fixed inductors . 5
3.1 General rules . 5
3.2 Examples of colour code for fixed inductors . 6
4 Digit and letter code for inductance values . 7
4.1 General rules . 7
4.2 Examples of digit and letter code for inductance values . 8
5 Letter code for tolerances of inductance values . 9
5.1 Symmetrical tolerances . 9
5.2 Other tolerances . 9
6 Date code system for fixed inductors . 9
6.1 Single-character code for year and month . 9
6.2 Two-character code for year and month . 10
6.3 Four-character code for year and week . 11
Bibliography . 12

Figure 1 – Example for 47 μH ± 10 % . 6
Figure 2 – Example for 4,7 μH ± 2 % . 7
Figure 3 – Example for 4,7 nH ± 5 %. 7

Table 1 – Values corresponding to colours . 6
Table 2 – Cardinal numbers for the multiplier . 7
Table 3 – Examples of digit and letter code for inductance values . 8
Table 4 – Letter code for symmetrical tolerance . 9
Table 5 – Single-character code for year and month for a four-year cycle . 10
Table 6 – Code letter for year in a twenty-year cycle . 10
Table 7 – Character code letter for month . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED INDUCTORS FOR USE IN ELECTRONIC AND
TELECOMMUNICATION EQUIPMENT – MARKING CODES

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.
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consensus of opinion on the relevant subjects since each technical committee has representation from all
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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
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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 61605 has been prepared by IEC technical committee 51: Mag
...

IEC 61605 ®
Edition 3.0 2016-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed inductors for use in electronic and telecommunication equipment –
Marking codes
Inductances fixes utilisées dans les équipements électroniques et de
télécommunications – Codes de marquage

IEC 61605 :2016-10(en-fr)
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
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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.

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IEC 61605 ®
Edition 3.0 2016-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed inductors for use in electronic and telecommunication equipment –

Marking codes
Inductances fixes utilisées dans les équipements électroniques et de

télécommunications – Codes de marquage

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-8775-0

– 2 – IEC 61605:2016 © IEC 2016
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Colour code for fixed inductors . 5
3.1 General rules . 5
3.2 Examples of colour code for fixed inductors . 6
4 Digit and letter code for inductance values . 7
4.1 General rules . 7
4.2 Examples of digit and letter code for inductance values . 8
5 Letter code for tolerances of inductance values . 9
5.1 Symmetrical tolerances . 9
5.2 Other tolerances . 9
6 Date code system for fixed inductors . 9
6.1 Single-character code for year and month . 9
6.2 Two-character code for year and month . 10
6.3 Four-character code for year and week . 11
Bibliography . 12

Figure 1 – Example for 47 μH ± 10 % . 6
Figure 2 – Example for 4,7 μH ± 2 % . 7
Figure 3 – Example for 4,7 nH ± 5 %. 7

Table 1 – Values corresponding to colours . 6
Table 2 – Cardinal numbers for the multiplier . 7
Table 3 – Examples of digit and letter code for inductance values . 8
Table 4 – Letter code for symmetrical tolerance . 9
Table 5 – Single-character code for year and month for a four-year cycle . 10
Table 6 – Code letter for year in a twenty-year cycle . 10
Table 7 – Character code letter for month . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED INDUCTORS FOR USE IN ELECTRONIC AND
TELECOMMUNICATION EQUIPMENT – MARKING CODES

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.
International Standard IEC 61605 has been prepared by IEC technical committee 51: Magnetic
components and ferrite materials.
This third edition cancels and replaces the second edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The date code system for fixed inductors has been updated.
The text of this standard is based on the following documents:
CDV Report on voting
51/1135/CDV 51/1147/RVC
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 2.

– 4 – IEC 61605:2016 © IEC 2016
The committee has decided that the contents of this publication will remain unchanged until the
stability 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.
FIXED INDUCTORS FOR USE IN ELECTRONIC AND
TELECOMMUNICATION EQUIPMENT – MARKING CODES

1 Scope
This document specifies marking codes for fixed inductors.
The colour code specified in Clause 3 gives a colour coding for fixed inductors. It is intended for
use with the values of the E3 to E24 series as specified in IEC 60063.
The code specified in Clause 4 gives a system for marking inductance values by means of digits
and letters.
The code specified in Clause 5 gives a system for marking the tolerance on inductance values by
means of letters.
The code specified in Clause 6 gives a system for marking of date codes on fixed inductors by
means of letters and digits.
2 Normative references
The following documents are referred to in the
...