IEC 62358:2012

IEC 62358 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Standard inductance factor for gapped cores and its tolerance

Noyaux de ferrite – Inductance spécifique normalisée pour noyaux à entrefer et
tolérances associées
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IEC 62358 ®
Edition 2.0 2012-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Standard inductance factor for gapped cores and its tolerance

Noyaux de ferrite – Inductance spécifique normalisée pour noyaux à entrefer et

tolérances associées
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 29.100.10 ISBN 978-2-83220-398-9

– 2 – 62358 © IEC:2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Measuring method . 6
4 A value and its tolerance . 6
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4.1 General . 6
4.2 Tolerance . 7
4.3 E-core . 7
4.4 ETD-core and EER-core . 7
4.5 EP-core . 7
4.6 RM-core . 7
4.7 Pot-core . 7
4.8 PQ-core . 7
4.9 Low-profile core . 7

Table 1 – Tolerance versus letter code . 7
Table 2 – A and its tolerance for E-cores (IEC 62317-8) . 8
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Table 3 – A and its tolerance for ETD-cores (IEC 61185) and EER-cores (IEC 62317-7) . 10
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Table 4 – A and its tolerance for EP-cores (IEC 61596) . 11
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Table 5 – A and its tolerance for RM-cores (IEC 62317-4) . 11
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Table 6 – A and its tolerance for Pot-cores (IEC 62317-2) . 12
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Table 7 – A and its tolerance for PQ-cores (IEC 62317-13) . 13
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Table 8 – A and its tolerance for EL-cores (IEC 62317-9) . 13
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Table 9 – A and its tolerance for EL-I (plate)-cores (IEC 62317-9) . 14
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Table 10 – A and its tolerance for low-profile ER-I (plate)-cores (IEC 62317-9) . 15
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Table 11 – A and its tolerance for low-profile ER-cores (IEC 62317-9) . 16
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Table 12 – A and its tolerance for low-profile E-I (plate)-cores (IEC 62317-9) . 17
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Table 13 – A and its tolerance for low-profile E-cores (IEC 62317-9) . 17
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Table 14 – A and its tolerance for low-profile RM cores (IEC 62317-4) . 18
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Table 15 – A and its tolerance for low-profile PQ-I (plate)-cores (IEC 62317-13) . 18
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62358 © IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
FERRITE CORES – STANDARD INDUCTANCE
FACTOR FOR GAPPED CORES AND ITS TOLERANCE

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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International Standard IEC 62358 has been prepared by IEC technical committee 51:
Magnetic components and ferrite materials.
This second edition cancels and replaces the first edition published in 2004. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
editions:
a) addition of A value (inductance factor) and its tolerance for PQ-cores;
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b) addition of A value (inductance factor) and its tolerance for EFD-cores;
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c) addition of A value (inductance factor) and its tolerance for Low-profile ER-I-cores;
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d) addition of A value (inductance factor) and its tolerance for Low-profile ER-cores
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(ER9,5 × 2,5 × 5, ER11 × 2,5 × 6, ER14,5 × 3 × 7 ferrite cores are same as the previous
edition);
e) addition of A value (inductance factor) and its tolerance for Low-profile PQ-I-cores.
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– 4 – 62358 © IEC:2012
The text of this standard is based on the following documents:
FDIS Report on voting
51/1005/FDIS 51/1008/RVD
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.
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.
62358 © IEC:2012 – 5 –
INTRODUCTION
The A value (inductance factor) and its tolerance have been specified by the users before.
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When manufacturers wish to have an inventory for short delivery, they have to hold the
products before gapping since there is no standard for the A value. Because of electronic
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commerce and the increased demand for rapid delivery of products, it will be more convenient
for customers and suppliers to refer to established A values and tolerances. This standard
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has been developed to meet th
...