IEC 63093-2:2025

IEC 63093-2 ®
Edition 2.0 2025-12
INTERNATIONAL
STANDARD
REDLINE VERSION
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities -
Part 2: Pot-cores for use in telecommunications, power supply, and filter
applications
ICS 29.100.10 ISBN 978-2-8327-0951-1
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CONTENTS
FOREWORD. 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Primary dimensions . 5
4.1 Dimensions of pot-cores . 5
4.1.1 General . 5
4.1.2 Principal dimensions . 6
4.1.3 Wire-ways . 8
4.1.4 Effective parameter values . 8
4.2 Main dimensions for coil formers . 9
5 Limits of surface irregularities . 10
5.1 General . 10
5.2 Examples of surface irregularities . 10
5.3 Chips and ragged edges . 11
5.3.1 General . 11
5.3.2 Chips and ragged edges on the mating surfaces . 11
5.3.3 Chips and ragged edges on the other surfaces . 11
5.4 Cracks . 13
5.5 Pull-out, crystallite and pore locations . 14
5.6 Flash . 15
Annex A (informative) Pot-core design . 16
Annex B (informative) Example of gauges to check the dimensions of pot-cores . 17
B.1 General . 17
B.2 Procedure and requirements . 18
Bibliography .

Figure 1 – Principal dimensions of pot-cores without back wall slots . 6
Figure 2 – Principal dimensions of pot-cores with back wall slots . 7
Figure 3 – Main dimensions of coil formers for pot-cores . 9
Figure 4 – Examples of surface irregularities . 10
Figure 5 – Chips and ragged edge location for pot-cores . 11
Figure 6 – Cracks location – Top view . 13
Figure 7 – Cracks location – Bottom view . 13
Figure 8 – Pull-out, crystallite and pore locations . 14
Figure 9 – Flash location . 15
Figure B.1 – Dimensions of gauge A . 17
Figure B.2 – Dimensions of gauges B and C . 18

Table 1 – Principal dimensions of pot-cores . 6
Table 2 – Limits for dimensions C and G . 7
Table 3 – Minimum wire-way depth . 8
Table 4 – Effective parameter values for pot-cores with a centre hole . 8
Table 5 – Effective parameter values for pot-cores without a centre hole. 9
Table 6 – Main dimensions of coil formers for pot-cores . 10
Table 7 – Area and length references of irregularities for visual inspection . 12
Table 8 – Limits for cracks . 14
Table A.1 – Ratio of diameter to height . 16
Table B.1 – Dimensions of gauge A . 17
Table B.2 – Dimensions of gauges B and C . 18

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Ferrite cores - Guidelines on dimensions
and the limits of surface irregularities -
Part 2: Pot-cores for use in telecommunications,
power supply, and filter applications

FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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This redline version of the official IEC Standard allows the user to identify the changes made
to the previous edition IEC 63093-2:2020. A vertical bar appears in the margin wherever a
change has been made. Additions are in green text, deletions are in strikethrough red text.

IEC 63093-2 has been prepared by IEC technical committee 51: Magnetic components, ferrite
and magnetic powder materials. It is an International Standard.
This second edition cancels and replaces the first edition published in 2020. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) revision of Table 4 and Table 5 according to IEC 60205:2016.
The text of this International Standard is based on the following documents:
Draft Report on voting
51/1581/FDIS 51/1588/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 63093 series, published under the general title Ferrite cores -
Guidelines on dimensions and the limits of surface irregularities, can be found on the IEC
website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 Scope
This part of IEC 63093 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of pot-cores made of ferrite, and the dimensional limits
for coil formers to be used with them, as well as the effective parameter values to be used in
calculations involving them. It also gives guidelines on the allowable limits of surface
irregularities applicable to pot-cores in accordance with the relevant generic specification.
The selection of core sizes and shapes for this document is based on the philosophy of including
those sizes which are industrial standards, either by inclusion in a national standard, 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 upon which the design of this range of cores is based are given in
Annex A.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 60401-1, Terms and nomenclature for cores made of magnetically soft ferrites - Part 1:
Terms used for physical irregularities and reference of dimensions
IEC 60424-1, Ferrite cores – Guidelines on the limits of surface irregularities – Part 1: General
specification
IEC 63093-1, Ferrite cores - Guidelines on dimensions and the limits of surface irregularities -
Part 1: General specification
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60401-1 and
IEC 60424-1 IEC 63093-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
4 Primary dimensions
4.1 Dimensions of pot-cores
4.1.1 General
Compliance with the following requirements ensures mechanical interchangeability of complete
assemblies and wound coil formers.
4.1.2 Principal dimensions
The principal dimensions of pot-cores shall be as given in Table 1, Figure 1 and Figure 2. The
dimensions of the cores may can be checked by means of gauges. By way of example, a
possible standard for these gauges is given in Annex B. In order to facilitate production it can
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 and in Table 2
is permitted.
Table 1 – Principal dimensions of pot-cores

a
A E F H 2B 2D
r
Size Figure
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Max.
b b
P3,3/2,6 3,18 2,50 1,30 1,40 – – 2,50 2,60 1,70 1,90 0,20 1
3,30 2,60
b b
P4,6/3,1 4,40 4,60 3,50 2,00 – – 3,00 3,10 2,10 2,30 0,20 1
3,65 1,90
b b b b
P5,8/3,3 4,50 2,50 0,95 1,05 3,20 3,30 2,20 2,40 0,20 1
5,65 5,80 4,60 2,40
b b b
P7,4/4,0 7,15 7,35 5,80 5,95 2,95 3,00 1,05 1,15 4,10 4,20 2,80 3,00 0,20 1
b b b b
P9/5 9,00 9,30 7,50 7,75 3,70 3,90 2,00 2,20 5,10 5,40 3,60 3,90 0,25 2
b
P11/7 10,9 11,3 9,00 9,40 4,70 2,00 2,20 6,30 6,60 4,40 4,70 0,25 2
4,50
b
P14/8 13,8 14,3 11,6 12,0 6,00 3,00 3,20 8,20 8,50 5,60 6,00 0,25 2
5,80
P18/11 17,6 18,4 14,9 15,4 7,30 7,60 3,00 3,20 10,4 10,7 7,20 7,60 0,25 2
P22/13 21,2 22,0 17,9 18,5 9,10 9,40 4,40 4,70 13,2 13,6 9,20 9,60 0,35 2
b
P26/16 25,0 26,0 21,2 22,0 11,5 5,40 5,70 15,9 16,3 11,0 11,4 0,35 2
11,1
b
P30/19 29,5 30,5 25,0 25,8 13,5 5,40 5,70 18,6 19,0 13,0 13,4 0,35 2
13,1
P36/22 35,0 36,2 29,9 30,9 15,6 16,2 5,40 5,70 21,4 22,0 14,6 15,0 0,35 2
NOTE 1 P3,3/2,6 and P4,6/3,1 cores are without the centre hole shown in Figure 1.
NOTE 2 The dimensions are expressed in millimetres.
a
Sharp inner corners of pot-cores are preferable but in practice some rounding can occur, provided that radius
r is not exceeded.
b
The specified dimensional tolerances do not comply with IEC TR 63090.

Figure 1 – Principal dimensions of pot-cores without back wall slots
Figure 2 – Principal dimensions of pot-cores with back wall slots
Table 2 – Limits for dimensions C and G

Wire slot dimensions
a a
Size
C G
Min. Max. Min. Max.
P3,3/2,6 – – 0,8 1,3
P4,6/3,1 – – 1,1 1,7
P5,8/3,3 – – 1,4 2,0
P7,4/4,0 – – 1,6 2,2
P9/5 6,0 7,5 1,6 2,4
P11/7 6,5 8,0 1,8 2,6
P14/8 8,7 10,0 2,3 4,1
P18/11 11,3 14,0 2,7 4,4
P22/13 13,3 16,5 3,0 4,4
P26/16 17,0 20,0 3,0 4,4
P30/19 20,0 23,0 3,5 5,3
P36/22 24,0 27,2 4,0 5,6
NOTE 1 The shape of the slots is not defined, but the width G is indicated in the table.
NOTE 2 The dimensions are expressed in millimetres.
a
It is recommended that any tightening of the tolerance on dimensions C should be towards the minimum value
and on dimension G towards the maximum value.

4.1.3 Wire-ways
Wire-ways are recesses in the floor of the pot-core, corresponding to the back wall slots, which
allow a path for wire leads from the centre of the coil to the outside. When wire-ways are
provided, their minimum depth shall be as given in Table 3.
Table 3 – Minimum wire-way depth
Size Wire-way depth
mm
P14/8 0,2
P18/11 0,3
P22/13 0,4
P26/16 0,5
P30/19 0,6
P36/22 0,6
4.1.4 Effective parameter values
The effective parameter values for pot-cores whose dimensions comply with 4.1.2 shall be as
given in Table 4 and Table 5. For the definitions of these parameters and their calculation,
reference shall be made to IEC 60205.
Table 4 – Effective parameter values for pot-cores with a centre hole
C C A l V A
1 2 e e e min
Size
−1 −3 −3 2 3 2
mm
mm 10 mm mm mm mm
P5,8/3,3 1,632 6 1,648 3 345,47349,61 4,734,71 7,727,77 36,536,6 3,663,79
P7,4/4,0 1,358 8 1,353 3 186,79183,78 7,277,36 9,889,97 71,973,4 5,795,92
P9/5 1,215 5 119,54 10,2 12,4 126 7,88
P11/7 0,942 72 57,419 16,4 15,5 254 13,2
P14/8 0,766 82 29,977 25,6 19,6 502 19,8
P18/11 0,579 32 13,023 44,5 25,8 1 150 36,0
P22/13 0,484 67 7,494 0 64,7 31,3 2 030 50,9
P26/16 4,093 8
0,391 93 95,7 37,5 3 590 76,1
4,097 4
P30/19 0,325 76 2,355 4 138 45,1 6 230 115
P36/22 0,258 42 1,261 6 205 52,9 10 800 173
NOTE The effective parameter values of P9/5 to P36/22 are calculated as pot-cores with back wall slots.

Table 5 – Effective parameter values for pot-cores without a centre hole
C C A l V A
1 2 e e e min
Size
−1 −3 −3 2 3 2
mm
mm 10 mm mm mm mm
P3,3/2,6 3,136 7 1 768,4
1,77 5,56 5,60 9,879,91 1,43
3,16 44 1 788,0
P4,6/3,1 2,088 7 609,06
3,433,42 7,16 7,21 24,6 2,602,80
2,108 8 617,19
P5,8/3,3 1,540 6 295,89
5,215,19 8,02 8,07 41,841,9 3,664,19
1,556 3 300,03
P7,4/4,0 1,294 1 163,38
7,927,99 10,3 81,282,4 5,796,40
1,291 0 161,58
P9/5 1,076 2 86,063 12,5 13,5 168 10,1
P11/7 0,874 18 46,857 18,7 16,3 304 15,2
P14/8 0,689 39 22,460 30,7 21,2 650 25,5
P18/11 0,545 61 11,083 49,2 26,9 1 320 40,2
P22/13 0,442 00 5,849 0 75,6 33,4 2 520 62,7
P26/16 0,358 04 3,220 0 111 39,8 4 430 93,6
P30/19 0,306 76 2,012 0 152 46,8 7 130 128
P36/22 0,248 69 1,140 9 218 54,2 11 800 185
NOTE The effective parameter values of P9/5 to P36/22 are calculated as pot-cores with back wall slots.

4.2 Main dimensions for coil formers
The main dimensions for coil formers shall be in accordance with Figure 3 and Table 6.
NOTE The dimensions of Table 6 which correspond to similar dimensions in Table 1 are labelled with the same
letter in upper case, for example, 2d corresponds to 2D in Table 1.

Figure 3 – Main dimensions of coil formers for pot-cores
Table 6 – Main dimensions of coil formers for pot-cores
Main dimensions of coil formers
Size e f 2d
Max. Min. Max.
P3,3/2,6 2,40 1,50 1,60
P4,6/3,1 3,40 2,10 2,00
P5,8/3,3 4,40 2,60 2,10
P7,4/4,0 5,70 3,10 2,70
P9/5 7,40 4,00 3,50
P11/7 8,90 4,80 4,30
P14/8 11,5 6,10 5,50
P18/11 14,8 7,70 7,10
P22/13 17,8 9,50 9,10
P26/16 21,1 11,6 10,9
P30/19 24,9 13,6 12,9
P36/22 29,8 16,3 14,5
NOTE The dimensions are expressed in millimetres.

5 Limits of surface irregularities
5.1 General
Surface irregularities are defined in IEC 60424-1 IEC 63093-1.
5.2 Examples of surface irregularities
Figure 4 shows different examples of surface irregularities on a pot-core.

Figure 4 – Examples of surface irregularities
5.3 Chips and ragged edges
5.3.1 General
The minimum area is taken as 0,5 mm , to be distinguishable to the naked eye.
5.3.2 Chips and ragged edges on the mating surfaces
The areas of the chips located on the mating surfaces (Chip 1 and Chip 1' irregularities in
Figure 5) shall not exceed the following limits:
– the cumulative area of the chips shall be less than 4 % of the total mating surface (whether
gapped or ungapped);
– the total length of the ragged edges shall be less than 25 % of the perimeter of the relevant
mating surface.
5.3.3 Chips and ragged edges on the other surfaces
The allowable areas of chips on the other surfaces are doubled as compared to the limits for
the mating surface (see Figure 5, Chip 1”).
The rule for ragged edges is the same as that for the mating surface.
Chips and ragged edges are not acceptable on the inner edges of the wire slot area.

Figure 5 – Chips and ragged edge location for pot-cores
The area and length references of irregularities for visual inspection are given in Table 7.
Table 7 – Area and length references of irregularities for visual inspection

5.4 Cracks
A single continuous crack which intersects the perimeter of the relevant surface at two points
is not acceptable (see S1, S1’ and S1” irregularities in Figure 6).
The limits for cracks at various locations shown in Figure 6 and Figure 7 are given in Table 8.

Figure 6 – Cracks location – Top view

Figure 7 – Cracks location – Bottom view
Table 8 – Limits for cracks
a
Type Location Limits for multiple cracks
Limits for single crack
S1, S1’, S1” Any place Not acceptable Not acceptable
b c
S2, S2’ Mating surface of centre-pole
≤ 50 % of centre-pole thickness Centre-pole thickness
S3, S3’ Mating surface of outer wall 1/2 × W 2 × W
S4, S4’ Side wall of centre-pole Centre-pole thickness Centre-pole thickness
S5, S5’ Side wall of outer wall Wall thickness, W 4 × W
S6, S6’ Corner of centre-pole/back 25 % of centre-pole circumference
25 % of centre-pole
wall circumference
25 % of relevant arc
and outer wall/back wall 25 % of relevant arc
S7, S7’ Back surface Back wall thickness 4 × back wall thickness
S8 Wire slot ≤ 50 % of the back wall thickness Back wall thickness
a
The length of the crack is designated as the length on one surface. When the crack extends onto two surfaces,
the length of the crack is judged by the length on each surface.
b
The crack of the cores without a centre hole shall be 20 % or less of the diameter of the centre-pole.
c
The crack of the cores without a centre hole shall be 50 % or less of the diameter of the centre-pole.

5.5 Pull-out, crystallite and pore locations
Figure 8 shows examples of the locations of a pull-out, crystallite and pore on a pot core:
– the cumulative area of pull-outs on the bottom surface of the core shall be less than 25 %
of the total respective surface area (including wire-way areas for the bottom surface);
– the single area of the crystallite located on any surface shall be less than 2 % of the
respective surface area;
– the cumulative area of the crystallites located on any surface shall be less than 4 % of the
respective surface area;
– the number of pores located on the same surface shall not exceed two; the total number of
pores located on all surfaces shall not exceed five;
– a hole with an area larger than 1 mm on any surface is not acceptable.

Figure 8 – Pull-out, crystallite and pore locations
5.6 Flash
Figure 9 shows an example of the location of a flash on the pot-core:
– there shall be no flash extending from the core into the wire slot.

Figure 9 – Flash location
Annex A
(informative)
Pot-core design
The pot-cores covered by this document were originally designed for optimum dimensions
based upon minimum loss R /L. Before optimizing for performance, the following hole diameter
dc
ranges were chosen:
– 0,95 mm to 1,05 mm for P5,8/3,3;
– 1,05 mm to 1,15 mm for P7,4/4,0;
– 2,0 mm to 2,2 mm for P9/5, P11/7;
– 3,0 mm to 3,2 mm for P14/8, P18/11;
– 4,4 mm to 4,7 mm for P22/13;
– 5,4 mm to 5,7 mm for P26/16, P30/19, P36/22.
Originally a pot-core of 14 mm × 8 mm, with an adjusting device of 3 mm diameter, was the
smallest that could be produced in quantity.
Due to miniaturization of electronic devices, four smaller pot-cores, P7,4/4,0, P5,8/3,3, P4,6/3,1
and P3,3/2,6 were added as standard pot-cores, and the larger pot-core P42/29 was deleted.
The ratio of diameter to height of the pot-core, calculated on the above assumption, is fairly
constant, as it appears from Table A.1, where A/2B lies between 1,48 and 1,76, except for the
smallest type.
Table A.1 – Ratio of diameter to height
Size A 2B A/2B
(nom.) (nom.)
P3,3/2,6 3,24 2,55 1,27
P4,6/3,1 4,50 3,05 1,48
P5,8/3,3 5,73 3,25 1,76
P7,4/4,0 7,25 4,15 1,75
P9/5 9,15 5,25 1,74
P11/7 11,1 6,50 1,71
P14/8 14,05 8,35 1,68
P18/11 18,0 10,55 1,71
P22/13 21,6 13,4 1,61
P26/16 25,5 16,15 1,58
P30/19 30,0 18,8 1,60
P36/22 35,6 21,7 1,64
NOTE The dimensions of A and 2B are expressed in millimetres.

The steps in the series are such that the ratio of R /L of two adjacent pot-cores is about 1,6.
dc
Annex B
(informative)
Example of gauges to check the dimensions of pot-cores
B.1 General
The gauges shall be in accordance with Table B.1 and Table B.2 and Figure B.1 and Figure B.2.

Figure B.1 – Dimensions of gauge A
Table B.1 – Dimensions of gauge A
e f 2d r
Size
Max. Min. Lim. Max. Min. Lim. Max. Min. Lim. Max. Min.
P3,3/2,6 2,495 2,480 2,460 1,417 1,405 1,435 1,695 1,683 1,665 0,35 0,25
P4,6/3,1 3,495 3,480 3,460 2,017 2,005 2,035 2,095 2,083 2,065 0,35 0,25
P5,8/3,3 4,495 4,480 4,460 2,517 2,505 2,535 2,195 2,183 2,169 0,35 0,25
P7,4/4,0 5,795 5,780 5,760 3,017 3,005 3,035 2,795 2,783 2,765 0,35 0,25
P9/5 7,495 7,480 7,459 3,917 3,905 3,935 3,595 3,583 3,565 0,35 0,25
P11/7 8,995 8,980 8,959 4,717 4,705 4,735 4,395 4,383 4,365 0,35 0,25
P14/8 11,595 11,577 11,544 6,017 6,005 6,035 5,595 5,583 5,565 0,35 0,25
P18/11 14,895 14,877 14,854 7,620 7,605 7,640 7,195 7,180 7,160 0,35 0,25
P22/13 17,895 17,877 17,854 9,420 9,405 9,440 9,195 9,180 9,160 0,45 0,35
P26/16 21,195 21,174 21,149 11,523 11,505 11,546 10,995 10,977 10,954 0,45 0,35
P30/19 24,995 24,974 24,949 13,523 13,505 13,546 12,995 12,977 12,954 0,45 0,35
P36/22 29,895 29,874 29,849 16,223 16,205 16,246 14,595 14,577 14,554 0,45 0,35
NOTE The dimensions are expressed in millimetres.

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