IEC 62317-8:2006

Ferrite cores - Dimensions - Part 8: E-cores

Specifies the dimensions that are of importance for mechanical interchangeability for E-cores with rectangular cross-section made of ferrite, the dimensions of coil formers to be used with them, and the effective parameter values to be used in associated calculations.

General Information

• Status: Replaced
• Publication Date: 27-Aug-2006
• ICS: 29.100.10 - Magnetic components
• Technical Committee: TC 51 - Magnetic components, ferrite and magnetic powder materials
• Drafting Committee: MT 1 - TC 51/MT 1
• Current Stage: DELPUB - Deleted Publication
• Start Date: 28-Apr-2017
• Completion Date: 27-Jun-2018

Relations

• Replaces: IEC 61246:1994/AMD1:2002 - Amendment 1 - Magnetic oxide cores (E-cores) of rectangular cross-section and associated parts - Dimensions
• Effective Date: 05-Sep-2023
• Replaces: IEC 61246:1994 - Magnetic oxide cores (E-cores) of rectangular cross-section and associated parts - Dimensions
• Effective Date: 05-Sep-2023
• Replaced By: IEC 63093-8:2018 - Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 8: E-cores
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 62317-8
First edition
2006-08
Ferrite cores – Dimensions –
Part 8:
E-cores
Reference number
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INTERNATIONAL IEC
STANDARD 62317-8
First edition
2006-08
Ferrite cores – Dimensions –
Part 8:
E-cores
 IEC 2006  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.
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– 2 – 62317-8  IEC:2006(E)
CONTENTS
FOREWORD.3

1 Scope.5

2 Normative references .5

3 Primary standards .5

3.1 Dimensions of E-cores with rectangular cross-section .5

3.2 Dimensional limits for coil formers .10

Annex A (normative) Derived standards .12
Annex B (normative) An example of a gauge to check the dimensions of E-cores
meeting the IEC primary standard.13

Figure 1 – Dimensions of E-cores with rectangular cross-section.6
Figure 2 – Main dimensions of coil formers .10
Figure B.1 – Gauge dimensions .13

Table 1 – Dimensions of E-cores with rectangular cross-section .6
Table 2 – Effective parameter and A values .8
min
Table 3 – Main dimensions of coil formers .10
Table B.1 – Gauge dimensions .14

62317-8  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FERRITE CORES – DIMENSIONS –
Part 8: E-cores
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62317-8 has been prepared IEC technical committee 51: Magnetic
components and ferrite materials.

This standard cancels and replaces IEC 61246 published in 1994, its amendment 1 (2002)
and replaces Table A.1 and Table B.1 of IEC 62358:2004. New rectangular centre leg E-cores,
which have been developed in the industry, were introduced in IEC 62358, and are in
widespread use. This standard has been revised to specify dimensions and effective
parameters for these newer rectangular centre leg E-cores.
The text of this standard is based on the following documents:
FDIS Report on voting
51/864/FDIS 51/872/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.

– 4 – 62317-8  IEC:2006(E)
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

IEC 62317 consists of the following parts, under the general title Ferrite cores – Dimensions:

Part 1: General specification (under consideration)

Part 2: Pot cores (under consideration, currently available as IEC 60133: Dimensions of

pot-cores made of magnetic oxides and associated parts)

Part 3: Half pot cores (under consideration, currently available as IEC 62323: Dimensions

of half pot-cores made of ferrite for inductive proximity switches)

Part 4: RM-cores and associated parts

Part 5: EP-cores (under consideration, currently available as IEC 61596: Magnetic oxide
EP-cores and associated parts for use in inductors and transformers – Dimensions)
Part 6: ETD-cores (under consideration, currently available as IEC 61185: Ferrite cores
(ETD-cores) intended for use in power supply applications – Dimensions)
Part 7: EER-cores
Part 8: E-cores
Part 9: Planar cores
Part 10: PM-cores (under consideration, currently available as IEC 61247: PM-cores made
of magnetic oxides and associated parts – Dimensions)
Part 11: EC-cores (under consideration, currently available as IEC 60647: Dimensions for
magnetic oxide cores intended for use in power supplies (EC-cores))
Part 12: Uncoated ring cores (under consideration, currently available as IEC TR 61604:
Dimensions of uncoated ring cores of magnetic oxides)
Part 13: PQ-cores (under consideration)
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
A bilingual version of this publication may be issued at a later date.

62317-8  IEC:2006(E) – 5 –
FERRITE CORES – DIMENSIONS –
Part 8: E-cores
1 Scope
This part of IEC 62317 specifies the dimensions that are of importance for mechanical

interchangeability for E-cores with rectangular cross-section made of ferrite, the dimensions
of coil formers to be used with them, and the effective parameter values to be used in
calculations involving them.
The selecting core sizes to this standard is based on the philosophy of including those sizes,
which are industrial standards, either by inclusion in national standards, or by broad-based
use in industry. See IEC 62317-1 for more detail concerning the philosophy of selecting core
sizes to be included.
NOTE Cores covered by this standard are intended for general applications at both low and high flux densities,
but they also find uses in special applications such as pulse transformers. They are generally used in pairs.
Whilst the main application of this standard is expected to be for ferrite cores, its validity for iron powder cores
should not be overlooked.
Coil formers are not specified for E-cores smaller than E 8/2, which are also used in SMD assemblies.
The use of “derived” standards, which give a more detailed specification of component parts
whilst still permitting compliance with this standard, is discussed in Annex A.
2 Normative references
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.
IEC 60205:2006, Calculation of the effective parameters of magnetic piece parts
3 Primary standards
Compliance with the following requirements ensures mechanical interchangeability of
complete assemblies and coil formers.

3.1 Dimensions of E-cores with rectangular cross-section
3.1.1 Main dimensions
The main dimensions of E-cores with rectangular cross-section shall be as given in Table 1.
NOTE The dimensions of the cores may be checked by means of gauges, an example of which is given in Annex
B. In order to facilitate production it may be necessary to use gauges having dimensions differing from those given
in Annex B, although no relaxation of the requirements for the dimensions of the cores given in Table 1 is thereby
permitted.
3.1.2 Effective parameter and A values
min
The effective parameter and A values of a pair of cores whose dimensions comply with
min
3.1.1 shall be as given in Table 2 (see IEC 60205, for the definitions of these parameters and
their calculation; and 2.2 of IEC 60205, for the definition of A ).
min
– 6 –               62317-8  IEC:2006(E)

B
C
D
IEC  1608/06
Figure 1 – Dimensions of E-cores with rectangular cross-section
Table 1 – Dimensions of E-cores with rectangular cross-section
A B C D E F
Old edition IEC
Size Industrial references
mm mm mm mm mm mm
references (IEC 61246)
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
E5,3/2 5,15 5,35 2,57 2,73 1,90 2,00 1,92 2,08 3,80 4,00 1,30 1,40 E5,3/2 FEE5,25 EE5
E6,3/2 6,05 6,30 2,80 2,90 1,90 2,00 1,85 2,05 3,60 3,80 1,30 1,40 E6,3/2 FEE6,18
E8/2 7,85 8,15 3,95 4,05 2,30 2,40 2,85 2,95 5,60 5,80 2,30 2,40 E8/2 FEE8
E8,3/4 8,10 8,60 3,90 4,10 3,40 3,80 2,90 3,10 6,10 6,50 1,60 2,00 FEE8,3 EE8
E8,8/2 8,60 9,40 3,85 4,15 1,78 2,02 2,03 2,40 5,07 5,33 1,78 2,02 E8,8/2 FEE9
E10/3 9,80 10,2 4,88 5,00 2,88 3,00 3,50 3,62 7,00 7,30 2,88 3,00 E10/3 FEE10
E10,2/5 10,0 10,5 5,35 5,65 4,50 4,90 4,05 4,35 7,60 8,00 2,20 2,60 FEE10,2 EE10/11
E13/4 12,2 13,1 6,30 6,50 3,40 3,70 4,50 4,80 8,9
...