Marking on ferrite cores

IEC 61333:2019 specifies marking locations and a coding system of marking on ferrite cores. An alphanumerical marking printed or attached to cores reduces the risk of incorrect assembly, mixing of materials and/or mixing of gapped cores on an assembly line. The markings of the inductance factor AL value or of the gap length are especially important to avoid this kind of problem, and their coding system is specified in this document.
This edition includes the following significant technical changes with respect to the previous edition:
a) the title of the document was changed;
b) the scope of this document was expanded;
c) the marking position instructions for ring cores, planar cores, RM-cores, PQ-cores and pot-cores were added in Clause 4 with a few additional descriptions;
d) the four-digit-maximum limit of material identification code has been deleted in 5.2;
e) in Table 1, the unit of AL has been changed from "nH" to "nH/N2".

Marquage des noyaux ferrites

L'IEC 61333:2019 spécifie les emplacements de marquage et un système de codification pour le marquage des noyaux ferrites. Un marquage alphanumérique imprimé ou fixé sur les noyaux réduit le risque de mauvais assemblage, de mélange de matériaux et/ou de mélange de noyaux à entrefer sur les lignes d'assemblage. Les marquages de la valeur de l'inductance spécifique AL ou de la longueur d'entrefer sont particulièrement importants pour éviter ce type de problème, et leur système de codification est spécifié dans le présent document.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) le titre du document a été modifié;
b) le domaine d'application du présent document a été étendu;
c) les instructions concernant les emplacements de marquage des noyaux toroïdaux, planaires, RM, PQ et P ont été ajoutées à l'Article 4, ainsi que plusieurs descriptions complémentaires;
d) la limite à quatre éléments au maximum pour le code d'identification du matériau a été supprimée en 5.2;
e) dans le Tableau 1, l'unité utilisée pour la valeur AL n'est plus "nH" et a été remplacée par "nH/N2".

General Information

Status
Published
Publication Date
29-Jul-2019
Current Stage
PPUB - Publication issued
Completion Date
30-Jul-2019
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IEC 61333
Edition 2.0 2019-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Marking on ferrite cores
Marquage des noyaux ferrites
IEC 61333:2019-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61333
Edition 2.0 2019-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Marking on ferrite cores
Marquage des noyaux ferrites
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.030 29.100.10 ISBN 978-2-8322-7247-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61333:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Marking locations ............................................................................................................ 5

5 Marking content ............................................................................................................... 7

5.1 General ................................................................................................................... 7

5.2 Material identification code ..................................................................................... 7

5.3 A value or gap length ............................................................................................ 7

Bibliography ............................................................................................................................ 9

Figure 1 – Examples of marking locations for U-cores ............................................................. 5

Figure 2 – Examples of marking locations for E-cores ............................................................. 6

Figure 3 – Examples of marking locations for ring-cores ......................................................... 6

Figure 4 – Examples of marking locations for planar-cores ..................................................... 6

Figure 5 – Examples of marking locations for RM-cores .......................................................... 6

Figure 6 – Examples of marking locations for PQ-cores .......................................................... 7

Figure 7 – Examples of marking locations for pot-cores .......................................................... 7

Table 1 – Examples of the coding of the A value ................................................................... 8

Table 2 – Examples of coding of the gap length ...................................................................... 8

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IEC 61333:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARKING ON FERRITE CORES
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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International Standard IEC 61333 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This second edition cancels and replaces the first edition published in 1996. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) the title of the document was changed;
b) the scope of this document was expanded;

c) the marking position instructions for ring cores, planar cores, RM-cores, PQ-cores and

pot-cores were added in Clause 4 with a few additional descriptions;

d) the four-digit-maximum limit of material identification code has been deleted in 5.2;

e) in Table 1, the unit of A has been changed from "nH" to "nH/N ".
---------------------- Page: 5 ----------------------
– 4 – IEC 61333:2019 © IEC 2019
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1247/CDV 51/1290/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.

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.
---------------------- Page: 6 ----------------------
IEC 61333:2019 © IEC 2019 – 5 –
MARKING ON FERRITE CORES
1 Scope

This document specifies marking locations and a coding system of marking on ferrite cores.

An alphanumerical marking printed or attached to cores reduces the risk of incorrect assembly,

mixing of materials and/or mixing of gapped cores on an assembly line. The markings of the

inductance factor A value or of the gap length are especially important to avoid this kind of

problem, and their coding system is specified in this document.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Marking locations

The recommended marking locations for the various core shapes are indicated in Figure 1 to

Figure 7:
– the shaded parts in Figures 1 to 7 represent the marking locations;

– the marking locations of ETD-, EER-, EC-, EFD- and EP-cores refer to the E-core.

Figure 1 – Examples of marking locations for U-cores
---------------------- Page: 7 ----------------------
– 6 – IEC 61333:2019 © IEC 2019
Figure 2 – Examples of marking locations for E-cores
Figure 3 – Examples of marking locations for ring-cores
Figure 4 – Examples of marking locations for planar-cores
Figure 5 – Examples of marking locations for RM-cores
---------------------- Page: 8 ----------------------
IEC 61333:2019 © IEC 2019 – 7 –
Figure 6 – Examples of marking locations for PQ-cores
Figure 7 – Examples of marking locations for pot-cores
5 Marking content
5.1 General

The following information should be marked on ferrite cores, and the priority of information

should follow the order given below if the marking space is limited. A maximum of four lines of

marking should be allowed, which includes:
a) material;
b) A value or gap length;
c) date code or batch code;
d) trade name or identification of the manufacturer;
e) tolerance of A value or gap length;
f) information for a special air-gap geometry such as step gap.

The coding systems for the date code and tolerance of the A value specified in IEC 60062

may be used. The marking shall be legible and shall be ab
...

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