IEC 62391-1:2015

Fixed electric double-layer capacitors for use in electric and electronic equipment - Part 1: Generic specification

IEC 62391-1:2015 applies to fixed electric double-layer capacitors (hereafter referred to as capacitor(s)) mainly used in d.c. circuits of electric and electronic equipment. This part of IEC 62391 establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. This edition includes the following significant technical changes with respect to the previous edition:
a) enhancement of the scope to include electric (high power) application;
b) implementation of Annex Q, replacing Clause 3 in the first edition;
c) in addition, minor revisions related to tables, figures and references.
The contents of the corrigenda of December 2016 and of June 2019 have been included in this copy.

Condensateurs électriques fixes à double couche utilisé dans les équipements électriques et électroniques - Partie 1: Spécification générique

L'IEC 62391-1:2015 s'applique aux condensateurs électriques fixes à double couche (appelés ci-après condensateurs) principalement utilisés dans des circuits à courant continu d'équipements électriques et électroniques. La présente partie de l'IEC 62391 définit les termes normalisés, les procédures de contrôle et les méthodes d’essai utilisés dans les spécifications intermédiaires et particulières des composants électroniques dans le cadre de l’assurance de la qualité, ainsi qu’à d’autres fins.
La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) renforcement du domaine d'application pour inclure des applications électriques (haute puissance);
b) mise en œuvre de l’Annexe Qqui remplace l’Article 3 de la première édition;
c) en plus, des révisions mineures des tableaux, valeurs et références.
Le contenu des corrigenda de décembre 2016 et de juin 2019 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 22-Oct-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.060.10 - Fixed capacitors
• Technical Committee: TC 40 - Capacitors and resistors for electronic equipment
• Drafting Committee: MT 62391-1 - TC 40/MT 62391-1
• Current Stage: DELPUB - Deleted Publication
• Start Date: 31-May-2021
• Completion Date: 20-Oct-2022

Relations

• Corrected By: IEC 62391-1:2015/COR2:2019 - Corrigendum 2 - Fixed electric double-layer capacitors for use in electric and electronic equipment - Part 1: Generic specification
• Effective Date: 05-Sep-2023
• Corrected By: IEC 62391-1:2015/COR1:2016 - Corrigendum 1 - Fixed electric double-layer capacitors for use in electric and electronic equipment - Part 1: Generic specification
• Effective Date: 05-Sep-2023
• Revises: IEC 62391-1:2006 - Fixed electric double-layer capacitors for use in electronic equipment - Part 1: Generic specification
• Effective Date: 05-Sep-2023
• Revised: IEC 62391-1:2022 - Fixed electric double-layer capacitors for use in electric and electronic equipment - Part 1: Generic specification
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62391-1 ®
Edition 2.0 2015-10
INTERNATIONAL
STANDARD
colour
inside
Fixed electric double-layer capacitors for use in electric and electronic
equipment –
Part 1: Generic specification
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.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]

CH-1211 Geneva 20 [e-mail]
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.

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and withdrawn publications. have been collected from earlier publications of IEC TC 37,

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IEC 62391-1 ®
Edition 2.0 2015-10
INTERNATIONAL
STANDARD
colour
inside
Fixed electric double-layer capacitors for use in electric and electronic

equipment –
Part 1: Generic specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.060.10 ISBN 978-2-8322-2956-9

– 2 – IEC 62391-1:2015 © IEC 2015

CONTENTS
FOREWORD . 7

1 Scope . 9

2 Normative references . 9

3 Terms and definitions . 10

4 General items . 14

4.1 Unit and symbols . 14

4.2 Preferred values and class . 14
4.2.1 General . 14
4.2.2 Preferred values of nominal capacitance . 15
4.2.3 Class . 15
4.3 Marking . 15
4.3.1 General . 15
4.3.2 Coding . 15
4.4 Quality assessment procedures . 15
5 Tests and measurement . 15
5.1 General . 15
5.2 Test and measurement requirements . 15
5.2.1 Test conditions . 15
5.2.2 Measurement conditions . 15
5.2.3 Voltage treatment . 16
5.2.4 Thermal treatment . 16
5.3 Drying . 16
5.4 Visual examination and check of dimensions . 16
5.4.1 Visual examination . 16
5.4.2 Dimensions (gauging) . 16
5.4.3 Dimensions (detail) . 16
5.5 Measurement method 1 for capacitance and internal resistance (constant
current discharge) . 16
5.5.1 Basic circuit for measuring . 16
5.5.2 Measuring equipment . 17
5.5.3 Measuring procedure . 18
5.5.4 Calculation methods for capacitance . 20

5.5.5 Calculation methods for internal resistance. 21
5.5.6 Conditions to be prescribed in the detail specification . 22
5.6 Measurement method 2 for capacitance and internal resistance . 22
5.6.1 Constant resistance charging method for capacitance measurement . 22
5.6.2 AC internal resistance measuring method . 23
5.7 Leakage current . 23
5.7.1 Measuring method . 23
5.7.2 Items to be specified in the detail specification . 24
5.8 Maintain voltage. 24
5.8.1 Measuring method . 24
5.8.2 Calculation of voltage maintenance rate . 25
5.8.3 Conditions to be prescribed in the detail specification . 25
5.9 Robustness of terminations . 25
5.9.1 Test Ua1 – Tensile . 25

5.9.2 Test Ub – Bending (half of the sample) . 25

5.9.3 Test Uc – Torsion (remaining sample) . 26

5.9.4 Test Ud – Torque (for terminations with threaded studs or screws and

for integral mounting devices) . 26

5.9.5 Visual examination . 26

5.10 Resistance to soldering heat . 26

5.10.1 Preconditioning and initial measurement . 26

5.10.2 Test . 26

5.10.3 Recovery . 26

5.10.4 Final inspection, measurements and requirements. 27

5.11 Solderability . 27
5.11.1 General . 27
5.11.2 Preconditioning . 27
5.11.3 Capacitors with leads . 27
5.11.4 Surface mount capacitors . 28
5.12 Rapid change of temperature . 28
5.12.1 Initial measurement . 28
5.12.2 Test . 28
5.12.3 Final inspection, measurements and requirements. 28
5.13 Vibration . 28
5.13.1 Initial measurement . 28
5.13.2 Test . 28
5.13.3 Final measurement and requirements . 29
5.14 Damp heat, steady state . 29
5.14.1 Initial measurement . 29
5.14.2 Test . 29
5.14.3 Final measurement . 29
5.15 Endurance . 29
5.15.1 Initial measurements . 29
5.15.2 Test . 29
5.15.3 Final measurement, inspection and requirements . 29
5.16 Storage . 30
5.16.1 Storage at high temperature . 30
5.16.2 Storage at low temperature . 30
5.17 Characteristics at high and low temperature . 30

5.17.1 General . 30
5.17.2 Test procedure . 30
5.17.3 Dry heat . 31
5.17.4 Cold. 31
5.17.5 Final measurement and requirements . 31
5.18 Component solvent resistance . 31
5.18.1 Initial measurements . 31
5.18.2 Test . 31
5.18.3 Requirements . 31
5.19 Solvent resistance of marking . 31
5.19.1 Test . 31
5.19.2 Requirements . 32
5.20 Passive flammability .
...

IEC 62391-1 ®
Edition 2.0 2015-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fixed electric double-layer capacitors for use in electric and electronic
equipment –
Part 1: Generic specification
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.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]

CH-1211 Geneva 20 [e-mail]
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.

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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.
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IEC 62391-1 ®
Edition 2.0 2015-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Fixed electric double-layer capacitors for use in electric and electronic

equipment –
Part 1: Generic specification
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.060.10 ISBN 978-2-8322-2986-6

– 2 – IEC 62391-1:2015 RLV © IEC 2015

CONTENTS
FOREWORD . 7

1 General .

1 Scope . 9

2 Normative references . 9

3 Terms and definitions . 11

4 Technical Data General items . 15

4.1 Unit and symbols . 15
4.2 Preferred values and class . 15
4.2.1 General . 15
4.2.2 Preferred values of nominal capacitance . 15
4.2.3 Class . 15
4.3 Marking . 15
4.3.1 General . 15
4.3.2 Coding . 16
4.4 Quality assessment procedures . 16
5 Tests and measurement procedures . 16
5.1 General . 16
5.2 Standard atmospheric conditions Test and measurement requirements . 16
5.2.1 Standard atmospheric conditions for testing Test conditions . 16
5.2.2 Measurement conditions . 17
5.2.3 Voltage treatment . 18
5.2.4 Thermal treatment . 18
5.3 Drying . 18
5.4 Visual examination and check of dimensions . 18
5.4.1 Visual examination . 18
5.4.2 Dimensions (gauging) . 18
5.4.3 Dimensions (detail) . 18
5.5 Measurement method 1 for capacitance and internal resistance (constant
current discharge) . 20
5.5.1 Basic circuit for measuring . 20
5.5.2 Measuring equipment . 21
5.5.3 Measuring procedure . 22

5.5.4 Calculation methods for capacitance . 24
5.5.5 Calculation methods for internal resistance. 25
5.5.6 Conditions to be prescribed in the detail specification . 26
5.6 Measurement method 2 for capacitance and internal resistance . 26
5.6.1 Constant resistance charging method for capacitance measurement . 26
5.6.2 AC internal resistance measuring method . 27
5.7 Leakage current . 29
5.7.1 Measuring method . 29
5.7.2 Items to be specified in the detail specification . 29
5.8 Self-dicharge Maintain voltage . 30
5.8.1 Measuring method . 30
5.8.2 Calculation of voltage maintenance rate . 30
5.8.3 Conditions to be prescribed in the detail specification . 31
5.9 Robustness of terminations . 31

5.9.1 Test Ua1 – Tensile . 31

5.9.2 Test Ub – Bending (half of the sample) . 31

5.9.3 Test Uc – Torsion (remaining sample) . 32

5.9.4 Test Ud – Torque (for terminations with threaded studs or screws and
for integral mounting devices) . 32

5.9.5 Visual examination . 32

5.10 Resistance to soldering heat . 32

5.10.1 Preconditioning and initial measurement . 32

5.10.2 Test . 32

5.10.3 Recovery . 33

5.10.4 Final inspection, measurements and requirements. 33
5.11 Solderability . 33
5.11.1 General . 33
5.11.2 Preconditioning . 33
5.11.3 Capacitors with leads . 33
5.11.4 Surface mount capacitors . 34
5.12 Rapid change of temperature . 35
5.12.1 Initial measurement . 35
5.12.2 Test . 35
5.12.3 Final inspection, measurements and requirements. 35
5.13 Vibration . 35
5.13.1 Initial measurement . 35
5.13.2 Test . 35
5.13.3 Final measurement and requirements . 35
5.14 Damp heat, steady state . 35
5.14.1 Initial measurement . 35
5.14.2 Test . 35
5.14.3 Final measurement . 35
5.15 Endurance . 36
5.15.1 Initial measurements . 36
5.15.2 Test . 36
5.15.3 Final measurement, inspection and requirements . 37
5.16 Storage . 37
5.16.1 Storage at high temperature . 37
5.16.2 Storage at low temperature . 37

5.17 Characteristics at high and low temperature . 37
5.17.1 General . 37
5.17.2 Test procedure . 38
5.17.3 Dry heat . 38
5.17.4 Cold. 38
5.17.5 Final measurement and requirements . 38
5.18 Component solvent resistance . 38
5.18.1 Initial measurements . 38
5.18.2 Test . 38
5.18.3 Requirements . 39
5.19 Solvent resistance of marking . 39
5.19.1 Test . 39
5.19.2 Requirements .
...

IEC 62391-1 ®
Edition 2.0 2015-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fixed electric double-layer capacitors for use in electric and electronic
equipment –
Part 1: Generic specification
Condensateurs électriques fixes à double couche utilisés dans les équipements
électriques et électroniques –
Partie 1: Spécification générique
IEC62391-1:2015-10(en-fr)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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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.

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Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

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The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
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IEC 62391-1 ®
Edition 2.0 2015-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fixed electric double-layer capacitors for use in electric and electronic

equipment –
Part 1: Generic specification
Condensateurs électriques fixes à double couche utilisés dans les équipements

électriques et électroniques –

Partie 1: Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.060.10 ISBN 978-2-8322-5160-7

– 2 – IEC 62391-1:2015 © IEC 2015
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 General items . 14
4.1 Unit and symbols . 14
4.2 Preferred values and class . 14
4.2.1 General . 14
4.2.2 Preferred values of nominal capacitance . 15
4.2.3 Class . 15
4.3 Marking . 15
4.3.1 General . 15
4.3.2 Coding . 15
4.4 Quality assessment procedures . 15
5 Tests and measurement . 15
5.1 General . 15
5.2 Test and measurement requirements . 15
5.2.1 Test conditions . 15
5.2.2 Measurement conditions . 15
5.2.3 Voltage treatment . 16
5.2.4 Thermal treatment . 16
5.3 Drying . 16
5.4 Visual examination and check of dimensions . 16
5.4.1 Visual examination . 16
5.4.2 Dimensions (gauging) . 16
5.4.3 Dimensions (detail) . 16
5.5 Measurement method 1 for capacitance and internal resistance (constant
current discharge) . 16
5.5.1 Basic circuit for measuring . 16
5.5.2 Measuring equipment . 17
5.5.3 Measuring procedure . 18
5.5.4 Calculation methods for capacitance . 20
5.5.5 Calculation methods for internal resistance. 21
5.5.6 Conditions to be prescribed in the detail specification . 22
5.6 Measurement method 2 for capacitance and internal resistance . 22
5.6.1 Constant resistance charging method for capacitance measurement . 22
5.6.2 AC internal resistance measuring method . 23
5.7 Leakage current . 23
5.7.1 Measuring method . 23
5.7.2 Items to be specified in the detail specification . 24
5.8 Maintain voltage. 24
5.8.1 Measuring method . 24
5.8.2 Calculation of voltage maintenance rate . 25
5.8.3 Conditions to be prescribed in the detail specification . 25
5.9 Robustness of terminations . 25
5.9.1 Test Ua1 – Tensile . 25
5.9.2 Test Ub – Bending (half of the sample) . 25

5.9.3 Test Uc – Torsion (remaining sample) . 26
5.9.4 Test Ud – Torque (for terminations with threaded studs or screws and
for integral mounting devices) . 26
5.9.5 Visual examination . 26
5.10 Resistance to soldering heat . 26
5.10.1 Preconditioning and initial measurement . 26
5.10.2 Test . 26
5.10.3 Recovery . 26
5.10.4 Final inspection, measurements and requirements. 27
5.11 Solderability . 27
5.11.1 General . 27
5.11.2 Preconditioning . 27
5.11.3 Capacitors with leads . 27
5.11.4 Surface mount capacitors . 28
5.12 Rapid change of temperature . 28
5.12.1 Initial measurement . 28
5.12.2 Test . 28
5.12.3 Final inspection, measurements and requirements. 28
5.13 Vibration . 28
5.13.1 Initial measurement . 28
5.13.2 Test . 28
5.13.3 Final measurement and
...