IEC 60068-2-82:2019

Environmental testing - Part 2-82: Tests - Test Xw1: Whisker test methods for components and parts used in electronic assemblies

IEC 60068-2-82:2019

Name:IEC 60068-2-82:2019   Standard name:Environmental testing - Part 2-82: Tests - Test Xw1: Whisker test methods for components and parts used in electronic assemblies
Standard number:IEC 60068-2-82:2019   language:English and French language
Release Date:13-May-2019   technical committee:TC 91 - Electronics assembly technology
Drafting committee:WG 3 - TC 91/WG 3   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 60068-2-82
Edition 2.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Environmental testing –
Part 2-82: Tests – Test Xw1: Whisker test methods for components and parts
used in electronic assemblies
Essais d'environnement –
Partie 2-82: Essais – Essai Xw1: Méthodes de vérification des trichites
pour les composants et les pièces utilisés dans les ensembles électroniques





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IEC 60068-2-82
Edition 2.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Environmental testing –
Part 2-82: Tests – Test Xw : Whisker test methods for components and parts
used in electronic assemblies
Essais d'environnement –
Partie 2-82: Essais – Essai Xw : Méthodes de vérification des trichites
pour les composants et les pièces utilisés dans les ensembles électroniques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-6863-6

– 2 – IEC 60068-2-82:2019 © IEC 2019
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Test equipment . 9
4.1 General . 9
4.2 Desiccator . 9
4.3 Humidity chamber . 9
4.4 Thermal cycling chamber . 9
4.5 Equipment for visual inspection . 9
4.5.1 Scanning electron microscope . 9
4.5.2 Optical microscope/Confocal laser microscope . 9
4.6 Fixing jig . 9
5 Preparation for test . 10
5.1 Selection of relevant tests . 10
5.1.1 General . 10
5.1.2 Storage conditions prior to testing . 11
5.1.3 Pre-aging (storage in the supply chain) before testing . 12
5.2 Handling of the specimens . 12
5.3 Sample size . 12
5.4 Surface and base materials for test selection . 12
5.5 Preconditioning of test specimen not intended for soldering/welding . 13
5.5.1 Preconditioning of test specimen intended for press-fit applications . 13
5.5.2 Preconditioning of test specimen intended for mechanical loads other
than press fit . 14
5.6 Preconditioning of test specimen intended for soldering/welding . 14
5.6.1 General . 14
5.6.2 Mechanical pretreatment . 14
5.6.3 Heat pre-treatment . 15
6 Test conditions . 15
6.1 General . 15
6.2 Ambient test . 15
6.3 Damp heat test . 15
6.4 Temperature cycling test . 16
6.5 Ambient test for press-fit applications . 16
7 Monitoring and technological similarity . 17
7.1 Monitoring . 17
7.2 Technological similarity . 17
8 Test and assessment . 18
8.1 Whisker investigation . 18
8.2 Initial measurement . 18
8.3 Test . 18
8.4 Recovery . 18
8.5 Intermediate or final assessment for each test condition . 18
8.5.1 Fixed threshold length for pass/fail classification . 18
8.5.2 Statistical assessment of whisker lengths . 19

9 Technology or manufacturing process changes . 19
10 Content of final report . 20
Annex A (normative) Measurement of whisker length . 22
Annex B (informative) Examples of whiskers . 23
Annex C (informative) Guidance on acceptance criteria . 25
C.1 Risks attributed to whiskers . 25
C.2 Acceptance criteria for whisker length . 25
C.3 Acceptance criteria for whisker density . 26
C.4 Statistical evaluation of number and length of whiskers. 26
C.5 Example of statistic evaluation . 26
Annex D (informative) Technical background of whisker growth . 29
Annex E (normative) Transition scenarios for the changeover of the damp-heat test
conditions . 30
Bibliography . 32

Figure 1 – Cross-sectional views of component termination surface finishes . 8
Figure 2 – Selection of test methods . 11
Figure 3 – . 14
Flow for treatment and/or bending and heat treatment
Figure A.1 – Estimation of whisker length . 22
Figure A.2 – Example for whisker length measurement . 22
Figure B.1 – Nodule . 23
Figure B.2 – Column whisker . 23
Figure B.3 – Filament whisker . 24
Figure B.4 – Kinked whisker . 24
Figure B.5 – Spiral whisker . 24
Figure C.1 – Smallest distance of compo
...

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