IEC 61605:2016

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)
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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
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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
...