IEC 62317-9:2006

INTERNATIONAL IEC
STANDARD 62317-9
Edition 1.1
2007-03
Edition 1:2006 consolidated with amendment 1:2007
Ferrite cores – Dimensions –
Part 9:
Planar cores
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INTERNATIONAL IEC
STANDARD 62317-9
Edition 1.1
2007-03
Edition 1:2006 consolidated with amendment 1:2007
Ferrite cores – Dimensions –
Part 9:
Planar cores
© IEC 2007 ⎯ Copyright - all rights reserved
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– 2 – 62317-9 © IEC:2006+A1:2007(E)

CONTENTS
FOREWORD.3

INTRODUCTION.5

1 Scope.6

2 Normative references.6

3 Primary standards.6

3.1 Planar shape and dimensions .6
3.2 Dimensions of planar core EL and the mating PLT-core .7
3.3 Dimensions of low-profile core E-core and the mating PLT-core.9
3.4 Dimensions of low-profile core ER-core.11

Annex A (normative) Low-profile core design.15

Figure 1 – Planar core EL and the mating PLT-core.7
Figure 2 – Low-profile E-core and the mating PLT-core.9
Figure 3 – Low-profile ER-core.11

Table 1 – Dimensions of planar core EL and the mating PLT-core.7
Table 2 – Effective parameter values and A values.8
min
Table 3 – Dimensions of low-profile E-core and the mating PLT-core .9
Table 4 – Effective parameter values and A values.10
min
Table 5 – Dimensions of low-profile ER-core .12
Table 6 – Effective parameter values and A values.14
min
Table A.1 – Sizes and design ratios for ER-core .17

62317-9 © IEC:2006+A1:2007(E) – 3 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
FERRITE CORES – DIMENSIONS –
Part 9: Planar cores
FOREWORD
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International Standard IEC 62317-9 has been prepared IEC technical committee 51: Magnetic
components and ferrite materials.
This International Standard cancels and replaces IEC 61860 published in 2000. This edition
constitutes a technical revision. This International Standard includes the following significant
technical changes and additions with respect to IEC 61860:2000:
a) addition of the planar EL family of cores;
b) addition of the low-profile ER family of cores;
c) the low-profile RM-family defined in IEC 61860:2000 has been moved to IEC 62137-4 for
RM-cores and associated parts.

– 4 – 62317-9 © IEC:2006+A1:2007(E)

This consolidated version of IEC 62317-9 consists of the first edition (2006) [documents
51/849/FDIS and 51/858/RVD] and its amendment 1 (2007) [documents 51/866/CDV and

51/876/RVC].
The technical content is therefore identical to the base edition and its amendment and has

been prepared for user convenience.

It bears the edition number 1.1.

A vertical line in the margin shows where the base publication has been modified by

amendment 1.
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 (under consideration)
Part 2: Pot cores (under consideration, currently available as IEC 60133)
Part 3: Half pot cores (under consideration, currently available as IEC 62323)
Part 4: RM-cores and associated parts
Part 5: EP-cores (under consideration, currently available as IEC 61596)
Part 6: ETD-cores (under consideration, currently available as IEC 61185)
Part 7: EER-cores
Part 8: E-cores
Part 9: Planar cores
Part 10: PM-cores (under consideration, currently available as IEC 61247)
Part 11: EC-cores (under consideration, currently available as IEC 60647)
Part 12: Uncoated ring cores (under consideration, currently available as IEC 61604)
The committee has decided that the contents of the base publication and its amendments 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.

62317-9 © IEC:2006+A1:2007(E) – 5 –

INTRODUCTION
Nowadays, d.c.-d.c. converter power supplies increasingly employ transformers and chokes

the windings of which are made of multi-layer printed circuit board or the windings are

constructed in the motherboard, rather than the transformers wound by conventional copper
wires. This part of IEC 62317 specifies the optimum shapes and dimensions of cores for SMD
(Surface Mounted Device) and of cores for which the windings are constructed in the

motherboard. The motherboard has slots cut out to accept the ferrite cores. This is called the

total integration in a multi-layer motherboard. The core shape specified in this part of

IEC 62317 satisfies the demand for lower profile as well as for smaller floor space.

– 6 – 62317-9 © IEC:2006+A1:2007(E)

FERRITE CORES – DIMENSIONS –
Part 9: Planar cores
1 Scope
This International Standard specifies the shapes and dimensions of ferrite cores for inductive

components (transformers and chokes) of which the coil is typically constructed by multi-layer
board or the coil is part of the motherboard.
The general consideration upon which the design of this range of cores is based is 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 62317-4:2005, Ferrite cores – Dimensions – Part 4: RM cores and associated parts
3 Primary standard
3.1 Planar shape and dimensions
The main shapes and dimensions shall be as given in the following figures and tables.
The main shape, dimensions, and parameters for EL core are given in:
Figure 1 – Planar core EL and mating PLT-core;
Table 1 – Dimensions of planar core EL and the mating PLT-core;
Table 2 – Effective parameter values and A values.
min
The main shape, dimensions, and parameters for low-profile E-cores are given in:

Figure 2 – Low-profile E-core and mating PLT-core;
Table 3 – Dimensions of low-profile E-core and the mating PLT-core;
Table 4 – Effective parameter values and A values.
min
The main shape, dimensions, and parameters for ER-cores are given in:
Figure 3 – Low-profile ER-core;
Table 5 – Dimensions of low-profile ER-core;
Table 6 – Effective parameter values and A values.
min
A uniform dimensional nomenclature has been chosen in order to facilitate a comparison of
major physical attributes among the different core shapes.

62317-9 © IEC:2006+A1:2007(E) – 7 –

3.2 Dimensions of planar core EL and the mating PLT-core

D
F
R : 8 places
R
B
1 B
2 C
C
R = F /2
1 1
IEC  581/06
Figure 1 – Planar core EL and the mating PLT-core
Table 1 – Dimensions of planar core EL and the mating PLT-core
Dimensions in millimetres
Size A B B C D E F F R
1 2 1 2 2
EL11 × 2,0     min. 10,80 1,91 8,60 0,90 8,97 2,68 6,25 0,3
11,20 2,11 9,00 1,10 9,37 2,88 6,55
max.
EL11 × 3,0     min. 10,80 2,91 8,60 1,90 8,97 2,68 6,25 0,3
max. 11,20 3,11 9,00 2,10 9,37 2,88 6,55
10,80 0,96 8,60
PLT11 × 1,0    min.
11,20 1,06 9,00
max.
12,75 2,09 10,20 0,90 10,63 3,19 7,41 0,3
EL13 × 2,2     min.
13,25 2,29 10,60 1,10 11,03 3,39 7,71
max.
EL13 × 3,2     min. 12,75 3,09 10,20 1,90 10,63 3,19 7,41 0,3
13,25 3,29 10,60 2,10 11,03 3,39 7,71
max.
PLT13 × 1,2    min. 12,75 1,14 10,20

max. 13,25 1,24 10,60
15,20 2,82 12,15 1,40 12,67 3,82 8,81 0,3
EL15,5 × 2,9   min.
15,80 3,02 12,65 1,60 13,17 4,02 9,21
max.
15,20 4,32 12,15 2,90 12,67 3,82 8,81 0,3
EL15,5 × 4,4   min.
15,80 4,52 12,65 3,10 13,17 4,02 9,21
max.
PLT15,5 × 1,4  min. 15,20 1,32 12,15
15,80 1,52 12,65
max.
EL18 × 3,7     min. 17,70 3,55 14,15 1,90 14,70 4,45 10,27 0,3
max. 18,30 3,75 14,65 2,10 15,30 4,65 10,67
17,70 5,55 14,15 3,85 14,70 4,45 10,27 0,3
EL18 × 5,7     min.
max. 18,30 5,75 14,65 4,15 15,30 4,65 10,67
F
E
A
A
– 8 – 62317-9 © IEC:2006+A1:2007(E)

Table 1 (continued)
Dimensions in millimetres
Size A B B C D E F F R
1 2 1 2 2
PLT18 × 1,7    min. 17,70 1,55 14,15

18,30 1,75 14,65
max.
EL20 × 3,8     min. 19,65 3,73 15,70 1,90 16,37 4,91 11,43 0,5

max. 20,35 3,93 16,30 2,10 16,97 5,21 11,83

19,65 5,68 15,70 3,85 16,37 4,91 11,43 0,5
EL20 × 5,8     min.
20,35 5,98 16,30 4,15 16,97 5,21 11,83
max.
19,65 1,73 15,70
PLT20 × 1,8   min.
20,35 1,93 16,30
max.
EL22 × 4,0     min. 21,60 3,92 17,30 1,90 17,98 5,41 12,54 0,5
22,40 4,12 17,90 2,10 18,68 5,71 13,04
max.
EL22 × 6,0    min. 21,60 5,87 17,30 3,85 17,98 5,41 12,54 0,5
max. 22,40 6,17 17,90 4,15 18,68 5,71 13,04
21,60 1,92 17,30
PLT22 × 2,0   min.
22,40 2,12 17,90
max.
24,55 4,19 19,65 1,90 20,48 6,17 14,29 0,5
EL25 × 4,3    min.
25,45 4,39 20,35 2,10 21,18 6,47 14,79
max.
EL25 × 6,3    min. 24,55 6,14 19,65 3,85 20,48 6,17 14,29 0,5
25,45 6,44 20,35 4,15 21,18 6,47 14,79
max
PLT25 × 2,3    min. 24,55 2,19 19,65
max. 25,45 2,39 20,35
Table 2 – Effective parameter values and A values
min
a)
C C l A V A
1 2 e e e min
Size Remarks
–1 –3 2 3 2
mm mm mm  mm mm mm
–3
0,826 45 13,7 16,5  226 15,9 Combination
EL-EL11 × 4,0 49,923  × 10
–3 EL-EL refers
357 22,4
EL-EL13 × 4,4 0,666 66 28,815  × 10 15,4 23,1
to two
–3
EL-EL15,5 × 5,8 0,596 74 18,143  × 10 19,6 32,9  646 31,9
shorter
height EL
–3
0,538 30 23,8 44,3 1 050 43,0
EL-EL18 × 7,3 12,162  × 10
cores for
size-
–3
1 400 52,9
EL-EL20 × 7,7 0,468 64  8,586 6 × 10 25,6 54,6
designation.
–3
EL-EL22 × 8,0 0,412 80  6,231 4 × 10 27,3 66,2 1 810 64,2
–3
EL-EL25 × 8,6 0,350 34  4,094 2 × 10 30,0 85,6 2 570 83,0

–3
0,826 45 13,7 16,5  226 15,9 Combination
EL-PLT11 × 4,0 49,943  × 10
–3 EL-PLT
357 22,4
EL-PLT13 × 4,4 0,666 66 28,815  × 10 15,4 23,1
refers to one
–3
EL-PLT15,5 × 5,8 0,569 74 18,143  × 10 19,6 32,9  646 31,9
taller height
EL core
–3
0,538 30 23,8 44,3 1 050 43,0
EL-PLT18 × 7,3 12,162  × 10
paired with
one PLT
–3
1 400 52,9
EL-PLT20 × 7,7 0,468 64  8,586 6 × 10 25,6 54,6
core for
–3 each size-
EL-PLT22 × 8,0 0,412 80  6,231 4 × 10 27,3 66,2 1 810 64,2
designation.
–3
0,350 34 30,0 85,6 2 570 83,0
EL-PLT25 × 8,6  4,094 2 × 10
62317-9 © IEC:2006+A1:2007(E) – 9 –

Table 2 (continued)
a)
C C l A V A
1 2 e e e min
Size Remarks
–1 –3 2 3 2
mm mm mm mm mm mm
–3
194 15,9 Combination
EL-PLT11 × 3,0 0,701 76 42,170  × 10 11,7 16,6
...