IEC 60063:2015

IEC 60063 ®
Edition 3.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Preferred number series for resistors and capacitors

Séries de valeurs normales pour résistances et condensateurs

All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
La recherche avancée permet de trouver des publications IEC Plus de 60 000 entrées terminologiques électrotechniques, en
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
IEC 60063 ®
Edition 3.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Preferred number series for resistors and capacitors

Séries de valeurs normales pour résistances et condensateurs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040; 31.060 ISBN 978-2-8322-2427-4

– 2 – IEC 60063:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 5
4 Number series . 5
4.1 Number series with two significant digits . 5
4.2 Number series with three significant digits . 6
5 Application of an E series . 8
5.1 Relationship between E series and tolerances . 8
5.2 Deduction from the marking and coding of values . 9
Bibliography . 10

Table 1 – Number series with two significant digits . 6
Table 2 – Number series with three significant digits . 7
Table 3 – Tolerances and recommended E series . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PREFERRED NUMBER SERIES FOR RESISTORS AND CAPACITORS

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60063 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This third edition cancels and replaces the second edition published in 1963 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– revision of the information on a relationship between an E Series and the tolerance of a
resistance or capacitance value of a respective component;
– introduction of advice on a possible deduction from the marking of a component to an
associated E Series and also to an associated tolerance;
– complete editorial revision.

– 4 – IEC 60063:2015 © IEC 2015
The text of this standard is based on the following documents:
FDIS Report on voting
40/2340A/FDIS 40/2370/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 website 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.
PREFERRED NUMBER SERIES FOR RESISTORS AND CAPACITORS

1 Scope
This International Standard provides series of preferred values for the resistance of resistors
and for the capacitance of capacitors.
The definition of such series with a defined numeric resolution is a basic prerequisite for the
marking and coding of capacitors and resistors with their respective capacitance or resistance
values as described in IEC 60062.
r i
NOTE The number series defined in this standard are based on progressive ratios of 10 , with r = 3 · 2 , and i
being a whole number in the range of 0 to 6, hence e.g. of 10 .
This system of progressive ratios had been established prior to the 1952 release of the first edition of this
standard as a consequence of the standardisation of tolerances at ±5 %, ±10 % and ±20 % and the related
commercial practice. An adoption of the ISO practice, based on a 10 system, was never considered achievable.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60062, Marking codes for resistors and capacitors
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
E series
infinite series of numeric values with a given number of elements per decade, rounded or
derived from the elements of a geometric series
Note 1 to entry: The number of elements within a decade, r, is given in the designation of the E series, Er, e.g.
E24 for a number series with 24 values per decade.
4 Number series
4.1 Number series with two significant digits
The series E24, E12, E6 and E3 with two significant digits are the decimal multiples and sub-
multiples of the respective values given in Table 1.
______________
IEC 60063:1952, Series of preferred values and their associated tolerances for resistors and capacitors

– 6 – IEC 60063:2015 © IEC 2015
Table 1 – Number series with two significant digits
E24 E12 E6 E3
10 10 10 10
12 12
15 15 15
18 18
22 22 22 22
27 27
33 33 33
39 39
47 47 47 47
56 56
68 68 68
82 82
The E24 series is derived from a geometric series composed of values, rounded to two
significant digits, of the theoretical numbers
n
( )
v= 10
where
v is a value of the E24 series, and
n is a whole positive or negative number.
NOTE The values of the E24 series in the range of 27 through 47, and the value 82, divert from the exact
mathematical rule. However, a correction of this deviation has never seemed appropriate in light of the historical
relevance of this series, having been established prior to the 1952 release of the first edition of this standard.
The E12 series is derived from the E24 series by omitting every second term, and likewise is
the E6 series derived from the E12 series and the E3 series derived from the E6 series by
omitting every second term thereof.
4.2 Number series with three significant digits
The series E192, E96 and E48 with three significant digits are the decimal multiples and sub-
multiples of the respective values given in Table 2.

Table 2 – Number series with three significant digits
E192 E96 E48 E192 E96 E48 E192 E96 E48 E192 E96 E48
100 100 100 178 178 178 316 316 316 562 562 562
101  180  320  569
102 102 182 182 324 324 576 576
104  184  328  583
105 105 105 187 187 187 332 332 332 590 590 590
106  189  336  597
107 107 191 191 340 340 604 604
109  193  344  612
110 110 110 196 196 196 348 348 348 619 619 619
111  198  352  626
113 113 200 200 357 357 634 634
114  203  361  642
115 115 115 205 205 205 365 365 365 649 649 649
117  208  370  657
118 118 210 210 374 374 665 665
120  213  379  673
121 121 121 215 215 215 383 383 383 681 681 681
123  218  388  690
124 124 221 221 392 392 698 698
126  223  397  706
127 127 127 226 226 226 402 402 402 715 715 715
129  229  407  723
130 130 232 232 412 412 732 732
132  234  417  741
133 133 133 237 237 237 422 422 422 750 750 750
135  240  427  759
137 137 243 243 432 432 768 768
138  246  437  777
140 140 140 249 249 249 442 442 442 787 787 787
142  252  448  796
143 143 255 255 453 453 806 806
145  258  459  816
147 147 147 261 261 261 464 464 464 825 825 825
149  264  470  835
150 150 267 267 475 475 845 845
152  271  481  856
154 154 154 274 274 274 487 487 487 866 866 866
156  277  493  876
158 158 280 280 499 499 887 887
160  284  505  898
162 162 162 287 287 287 511 511 511 909 909 909
164  291  517  920
165 165 294 294 523 523 931 931
167  298  530  942
169 169 169 301 301 301 536 536 536 953 953 953
172  305  542  965
174 174 309 309 549 549 976 976
176  312  556  988
– 8 – IEC 60063:2015 © IEC 2015
The E192 series is a geometric series composed of values, rounded to three significant digits,
of the theoretical numbers
n
v=( 10)
where
v is a value of the E192 series, and
n is a whole positive or negative number.
The E96 series is derived from the E192 series by omitting every second term, and similarly,
the E48 series is derived from the E96 series by omitting every second term thereof.
5 Application of an E series
5.1 Relationship between E series and tolerances
A sequential range of components is usually established in a way that a tolerance range of
any given value, i.e. the range defined by that given value minus and plus the given tolerance,
does not significantly overlap with the tolerance range of the next succeeding value. This
consideration suggests a fixed relationship between the tolerance and the progression ratio of
any range of components.
Table 3 gives the recommended assignment of the E series and the tolerance for components
with symmetrical tolerances.
Table 3 – Tolerances and recommended E series
Tolerance E series
%
E3
wider than ±20
±20 E6
±10 E12
E24
±5
±2 E48
±1 E96
tighter than ±1 E192
The relationships shown in Table
...