IEC 62317-14:2008

IEC 62317-14 ®
Edition 1.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Dimensions –
Part 14: EFD-cores for use in power supply applications

Noyaux ferrites – Dimensions –
Partie 14: Noyaux EFD utilisés dans des applications d’alimentation électrique

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IEC 62317-14 ®
Edition 1.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Dimensions –
Part 14: EFD-cores for use in power supply applications

Noyaux ferrites – Dimensions –
Partie 14: Noyaux EFD utilisés dans des applications d’alimentation électrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
L
CODE PRIX
ICS 29.100.10 ISBN 978-2-88910-669-1
– 2 – 62317-14 © IEC:2008
CONTENTS
FOREWORD.3

1 Scope.5

2 Normative references.5

3 Primary standards.5

3.1 Dimensions of EFD-cores .5

3.1.1 Principal dimensions .5

3.1.2 Effective parameter and A values .7
min
3.2 Main dimensions for coil formers.7
3.3 Pin locations and base outlines.8
3.4 Pin diameter .9
4 Mounting .9
Annex A (informative) EFD–core design .10

Figure 1 – Dimensions of EFD-cores .6
Figure 2 – Main dimensions of coil formers for EFD-cores .7
Figure 3 – Pin location (SMD type) viewed from the upper side of the board.8
Figure 4 – Pin locations (PTH type) viewed from the upper side of the board .9

Table 1 – Dimensions of EFD-cores .6
Table 2 – Effective parameter and A values for EFD-cores.7
min
Table 3 – Main dimensions of coil formers for EFD-cores .7

62317-14 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

______________
FERRITE CORES –
DIMENSIONS –
Part 14: EFD-cores for use in power supply applications

FOREWORD
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
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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.
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62317-14 has been prepared IEC technical committee 51: Magnetic
components and ferrite materials.

This bilingual version, published in 2009-02, corresponds to the English version.
The text of this standard is based on the following documents:
FDIS Report on voting
51/934/FDIS 51/938/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – 62317-14 © IEC:2008
A list of all parts of the IEC 62317 series, under the general title Ferrite cores – Dimensions, can

be found on the IEC website.
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.
62317-14 © IEC:2008 – 5 –
FERRITE CORES –
DIMENSIONS –
Part 14: EFD-cores for use in power supply applications

1 Scope
This part of IEC 62317 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of EFD-cores, the essential dimensions of coil formers to
be used with them, and the effective parameter values to be used in calculations involving them.
The selection of core sizes for 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.
The general considerations that the design of this range of cores is based upon are given 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, Calculation of the effective parameters of magnetic piece parts
IEC 62317-1, Ferrite cores – Dimensions – Part 1: General specification
3 Primary standards
Compliance with the following requirements ensures mechanical interchangeability of complete
assemblies and wound coil formers.
3.1 Dimensions of EFD-cores
3.1.1 Principal dimensions
The principal dimensions of EFD-cores shall be as given in Figure 1 and Table 1.

– 6 – 62317-14 © IEC:2008
C B C B
F
a F a 2
D D
K K
IEC  1466/08
a
The K dimension designates, with respect to the base level of the core, the difference in height between the base level
of the core and the underside of the centre leg. In the typical case, the underside of the centre leg is above the base
level of the core, and the value of K is positive. In the case that the underside of the centre leg is below the base level
of the core, then the value of K will be negative.

a) EFD 10/5/3, EFD 12/6/3,5 and EFD 15/8/5 b) EFD 20/10/7, EFD 25/13/9 and EFD 30/15/9
Figure 1 – Dimensions of EFD-cores
Table 1 – Dimensions of EFD-cores
a
A B C D E F F K q
1 2
Size
mm mm  mm mm mm mm mm mm
mm
EFD 10/5/3   Min. 10,
...