Ferrite cores (ETD-cores) intended for use in power supply applications - Dimensions

Specifies the dimensions that are of importance for mechanical interchangeability for ETD-cores made of ferrite, the essential dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them.

Ferritkerne (ETD-Kerne) für die Stromversorgung - Maße

Noyaux ferrites (noyaux ETD) destinés à être utilisés dans les alimentations - Dimensions

Specifies the dimensions that are of importance for mechanical interchangeability for ETD-cores made of ferrite, the essential dimensions of coil formers to be used with them, and the effective parameter values to be used in calculations involving them.

Feritna jedra (ETD-jedra) za uporabo v napajalnikih – Mere (IEC 61185:2005)

General Information

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6060 - National Implementation/Publication (Adopted Project)
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Due Date
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december 2005
Feritna jedra (ETD-jedra) za uporabo v napajalnikih – Mere (IEC 61185:2005)
Ferrite cores (ETD-cores) intended for use in power supply applications –
Dimensions (IEC 61185:2005)
ICS 29.100.10 Referenčna številka
SIST EN 61185:2005(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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ICS 29.100.10 Supersedes EN 61185:1997

English version

Ferrite cores (ETD-cores) intended for use
in power supply applications –
(IEC 61185:2005)

Noyaux ferrites (noyaux ETD)  Ferritkerne (ETD-Kerne)
destinés à être utilisés für die Stromversorgung –
dans les alimentations – Maße
Dimensions (IEC 61185:2005)
(CEI 61185:2005)

This European Standard was approved by CENELEC on 2005-06-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61185:2005 E

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EN 61185:2005 - 2 -
The text of document 51/818/FDIS, future edition 2 of IEC 61185, prepared by IEC TC 51, Magnetic
components and ferrite materials, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 61185 on 2005-06-01.
This European Standard supersedes EN 61185:1997.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-06-01
Annex ZA has been added by CENELEC.
Endorsement notice
The text of the International Standard IEC 61185:2005 was approved by CENELEC as a European
Standard without any modification.

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- 3 - EN 61185:2005
Annex ZA

Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60205 2001 Calculation of the effective parameters of EN 60205 2001
magnetic piece parts

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Second edition

Ferrite cores (ETD-cores) intended for use
in power supply applications –

 IEC 2005  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: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
Commission Electrotechnique Internationale N
International Electrotechnical Commission
For price, see current catalogue

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– 2 – 61185  IEC:2005(E)

1 Scope.5
2 Normative references .5
3 Primary standards .5
3.1 Dimensions of ETD-cores.5
3.2 Dimensional limits for coil formers .5
3.3 Pin locations and base outlines .6
3.4 Pin diameter.6
4 Marking .6
5 Mounting .6

Annex A (normative) Derived standards .11
Annex B (normative) Example of a standard for gauges to check the dimensions of
ETD-cores meeting this primary standard .14

Figure 1 – Dimensions of ETD-cores.6
Figure 2 – Essential dimensions of coil formers .8
Figure 3 – Pin locations and base outlines viewed from the upper-side of the board
(see 3.3) .10
Figure A.1 – Main dimensions.12
Figure B.1 – Gauge dimensions .14

Table 1 – Dimensions of ETD-cores.7
Table 2 – Effective parameter and A values .7
Table 3 – Essential dimensions of coil formers.8
Table A.1 – Main dimensions .13
Table B.1 – Gauge dimensions .14

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61185  IEC:2005(E) – 3 –


1) The International Electrotechnical Commission (IEC) 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, 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
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 61185 has been prepared by IEC technical committee 51:
Magnetic components and ferrite materials.
This second edition cancels and replaces the first edition published in 1992 and its
amendment 1 (1995).
The main changes with respect to the previous edition consist in combining it with the
The text of this standard is based on the following documents:
FDIS Report on voting
51/818FDIS 51/826/RVD

Full information on the voting for the approval of this standard can be found in the report on

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