IEC 62391-1:2022

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

IEC 62391-1:2022 applies to fixed electric double-layer capacitors (hereafter referred to as capacitors) mainly used in DC 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:  
The document has been completely restructured to comply with the ISO/IEC Directives, Part 2; a new technical categorization of test methods has been introduced and the test methods have been reorganized according to these new categories; tables, figures and references have been revised accordingly.
Calculation formula of charging/discharging efficiency in Annex D were divided into two cases: "Calculation assuming full charge and discharge" and "Calculation assuming incomplete charging and discharging due to internal resistance".

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

L’IEC 62391-1:2022 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.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:  
Le présent document a été intégralement restructuré pour satisfaire aux Directives ISO/IEC, Partie 2. De nouvelles catégories techniques des méthodes d’essai ont été introduites, les méthodes d’essai ayant été réorganisées en fonction de ces nouvelles catégories. Les tableaux, figures et références ont été révisés en conséquence.
Les formules de calcul de l’efficacité de charge/décharge de l’Annexe D ont été divisées en deux: "Calcul prenant pour hypothèse la pleine charge et la pleine décharge" et "Calcul prenant pour hypothèse une charge et une décharge incomplètes, dues à la résistance interne".

General Information

• Status: Published
• Publication Date: 19-Oct-2022
• 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: PPUB - Publication issued
• Start Date: 28-Oct-2022
• Completion Date: 20-Oct-2022

Relations

• Revises: IEC 62391-1:2015 - 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 3.0 2022-10
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

IEC 62391-1:2022-10(en-fr)

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IEC 62391-1

®


Edition 3.0 2022-10




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 978-2-8322-5729-6




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 62391-1:2022 © IEC 2022
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 General requirements . 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 . 15
5 General provisions for tests and measurement procedures . 16
5.1 General . 16
5.2 Test and measurement requirements . 16
5.2.1 Test conditions . 16
5.2.2 Measurement conditions . 16
5.2.3 Voltage treatment . 16
5.2.4 Thermal treatment . 16
5.3 Drying . 16
5.4 Storage . 17
5.4.1 Storage at high temperature . 17
5.4.2 Storage at low temperature . 17
6 Electrical tests and measurements . 17
6.1 Measurement method 1 for capacitance and internal resistance (constant
current discharge) . 17
6.1.1 Basic circuit for measuring . 17
6.1.2 Measuring equipment . 18
6.1.3 Measurement procedure . 19
6.1.4 Calculation methods for capacitance . 21
6.1.5 Calculation methods for internal resistance. 22
6.1.6 Conditions to be prescribed in the detail specification . 23
6.2 Measurement method 2 for capacitance and internal resistance . 23
6.2.1 Constant resistance charging method for capacitance measurement . 23
6.2.2 AC internal resistance measurement method . 24
6.3 Leakage current . 24
6.3.1 Measurement method . 24
6.3.2 Items to be specified in the detail specification . 26
6.4 Maintain voltage. 26
6.4.1 Measurement method . 26
6.4.2 Calculation of voltage maintenance rate . 27
6.4.3 Conditions to be prescribed in the detail specification . 27
7 Mechanical tests and measurements . 27
7.1 Visual examination and check of dimensions . 27
7.1.1 Visual examination . 27

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IEC 62391-1:2022 © IEC 2022 – 3 –
7.1.2 Dimensions (gauging) . 27
7.1.3 Dimensions (detail) . 28
7.2 Robustness of terminations . 28
7.2.1 Test Ua1 – Tensile . 28
7.2.2 Test Ub – Bending (half of the sample) . 28
7.2.3 Test Uc – Torsion (remaining sample) . 28
7.2.4 Test Ud – Torque (for terminations with threaded studs or screws and
for integral mounting devices) . 28
7.2.5 Visual examination . 29
7.3 Vibration . 29
7.3.1 Initial measurement . 29
7.3.2 Test . 29
7.3.3 Final measurement and requirements . 29
8 Environmental and climatic tests . 29
8.1 Rapid change of temperature . 29
8.1.1 Initial measurement . 29
8.1.2 Test . 29
8.1.3 Final inspection, measurements and requirements. 29
8.2 Damp heat, steady state . 30
8.2.1 Initial measurement . 30
8.2.2 Test . 30
8.2.3 Final measurement . 30
8.3 Endurance . 30
8.3.1 Initial measurements . 30
8.3.2 Test . 30
8.3.3 Final measurement, inspection and requirements . 30
8.4 Characteristics at high and low temperature . 31
8.4.1 General . 31
8.4.2 Test procedure . 31
8.4.3 Dry heat . 31
8.4.4 Cold. 31
8.4.5 Final measurement and requirements . 31
9 Tests related to component assembly . 31
9.1 Resistance to soldering heat . 31
9.1.1 Preconditioning and initial measurement . 31
9.1.2 Test . 31
9.1.3 Recovery . 32
9.1.4 Final inspection, measurements and requirements. 32
9.2 Solderability . 32
9.2.1 General . 32
9.2.2 Preconditioning . 32
9.2.3 Capacitors with leads . 32
9.2.4 Surface mount capacitors . 33
9.3 Component solvent resistance . 33
9.3.1 Initial measurements . 33
9.3.2 Test . 33
9.3.3 Requirements . 33
9.4 Solvent resistance of marking . 34
9.4.1 Test . 34

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– 4 – IEC 62391-1:2022 © IEC 2022
9.4.2 Requirements . 34
10 Tests related to safety . 34
10.1 Passive flammability . 34
10.1.1 Test procedure . 34
10.1.2 Requirements . 34
10.2 Pressure relief (if applicable) . 35
10.2.1 Test . 35
10.2.2 Requirements . 35
11 Quality assessment procedures . 35
Annex A (normative) Classification according to capacitance and internal resistance . 36
A.1 General . 36
A.2 Classification by capacitance and internal resistance . 36
Annex B (informative) Measurement method of capacitance and low resistance by low
frequency AC method (reference) . 38
B.1 General . 38
B.2 Measurement system . 38
B.3 Calculation of capacitance . 38
B.4 Measurement conditions . 39
Annex C (informative) Thermal equilibrium time of capacitors . 40
C.1 General . 40
C.2 Thermal equilibrium time of capacitors . 40
Annex D (informative) Charging/discharging efficiency and measurement current . 42
D.1 General . 42
D.2 Charging efficiency, discharging efficiency, and current . 42
D.2.1 Calculation assuming full charge and discharge . 42
D.2.2 Calculation assuming incomplete charging and discharging due to
internal resistance . 43
Annex E (informative) Procedures for setting the measurement current of capacitor
with uncertain nominal internal resistance . 46
E.1 General . 46
E.2 Current setting procedures for measurement of capacitor . 46
E.3 Example of a current setting for determining capacitor characteristics . 46
Annex F (informative) Policy on uncertainty of measurement and inset limits . 47
F.1 Objective . 47
F.2 Calculation of measurement uncertainty . 47
F.3 Policy . 47
F.4 Calculation of inset and outset limits . 47
F.5 Examples . 48
F.5.1 General . 48
F.5.2 Example 1: Resistor measurement . 48
F.5.3 Example 2: Resistor measurement . 48
F.5.4 Example 3: Transistor measurement (gain) . 48
F.5.5 Example 4: Comparison between initial and final measurement results . 48
Annex Q (normative) Quality assessment procedures . 49
Q.1 General . 49
Q.1.1 Overview . 49
Q.1.2 Applicability of qualification approval . 49
Q.1.3 Applicability of capability approval . 49

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IEC 62391-1:2022 © IEC 2022 – 5 –
Q.1.4 Applicability of technology approval . 50
Q.2 Primary stage of manufacture . 50
Q.3 Subcontracting . 50
Q.4 Structurally similar components . 50
Q.5 Qualification approval procedures . 50
Q.5.1 Eligibility for qualification approval . 50
Q.5.2 Application for qualification approval . 51
Q.5.3 Test procedure for qualification approval . 51
Q.5.4 Granting of qualification approval . 51
Q.5.5 Maintenance of qualification approval . 51
Q.5.6 Quality conformance inspection . 51
Q.6 Capability approval procedures . 51
Q.6.1 General . 51
Q.6.2 Eligibility for capability approval . 52
Q.6.3 Application for capability approval . 52
Q.6.4 Description of capability . 52
Q.6.5 Demonstration and verification of capability . 53
Q.6.6 Programme for capability approval . 53
Q.6.7 Capability approval test report . 54
Q.6.8 Abstract of description of capability . 54
Q.6.9 Modifications likely to affect the capability approval . 54
Q.6.10 Initial capability approval . 54
Q.6.11 Granting of capability approval . 55
Q.6.12 Maintenance of capability approval . 55
Q.6.13 Extension of capability approval . 56
Q.6.14 Quality conformance inspection . 56
Q.7 Rework and repair. 56
Q.7.1 Rework . 56
Q.7.2 Repair . 57
Q.8 Release for delivery . 57
Q.8.1 General . 57
Q.8.2 Release for delivery under qualification approval before the completion
of group B tests . 57
Q.9 Certified test records of released lots . 57
Q.10 Delayed delivery . 57
Q.11 Alternative test methods . 57
Q.12 Manufacture outside the geographical limits of IECQ CBs . 57
Q.13 Unchecked parameters . 57
Q.14 Technology approval procedures . 58
Q.14.1 General . 58
Q.14.2 Eligibility for technology approval . 58
Q.14.3 Application of technology approval . 58
Q.14.4 Description of technology . 58
Q.14.5 Demonstration and verification of the technology . 58
Q.14.6 Granting of technology approval . 58
Q.14.7 Maintenance of technology approval . 58
Q.14.8 Quality conformance inspection . 58
Q.14.9 Failure rate level determination. 59
Q.14.10 Outgoing quality level . 59

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– 6 – IEC 62391-1:2022 © IEC 2022
Annex X (informative) Cross-references to IEC 62391-1:2015 . 60
Bibliography . 61

Figure 1 − Basic circuit for measuring . 18
Figure 2 – Voltage–time characteristics between capacitor terminals in capacitance
and internal resistance measurement . 19
Figure 3 − Circuit for constant resistance charging method . 23
Figure 4 − Circuit for AC resistance method . 24
Figure 5 – Circuit for measuring leakage currents . 25
Figure 6 − Diagram of current and voltage changes at the time of measuring the
leakage current .
...