Varistors for use in electronic equipment - Part 1: Generic specification

This part of IEC 61051 is a generic specification and is applicable to varistors with symmetrical voltage-current characteristics for use in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications for quality assessment or any other purpose. NOTE Detail specifications can be specifications within the IEC system, another specification system linked to IEC, or specified by the manufacturer or user. The drafting of a complete detail specification by IEC technical committee 40, if required, follows the rules described in Annex A.

Varistoren zur Verwendung in Geräten der Elektronik - Teil 1: Fachgrundspezifikation

Varistances utilisées dans les équipements électroniques - Partie 1: Spécification générique

La présente partie de l'IEC 61051 est une spécification générique applicable aux varistances à caractéristiques tension-courant symétriques, utilisées dans les équipements électroniques. Elle établit les termes normalisés, les procédures de contrôle et les procédures d'essai utilisés dans les spécifications intermédiaires et particulières à des fins d'assurance de la qualité ou à toute autre fin. NOTE Les spécifications particulières peuvent être des spécifications au sein du système de l'IEC, un autre système de spécifications lié à l'IEC, ou spécifiées par le fabricant ou l'utilisateur. La rédaction d'une spécification particulière complète par le comité d'études 40 de l'IEC, si elle est exigée, suit les règles décrites dans l'Annexe A.

Varistorji za elektronsko opremo - 1. del: Rodovna specifikacija (IEC 61051-1:2018)

Ta del standarda EN 61051 je splošna specifikacija in se uporablja za varistorje s simetričnimi značilnostmi napetostnega toka za uporabo v elektronski opremi.
Določa splošne pogoje, inšpekcijske postopke in preskusne metode za uporabo v sekcijskih in podrobnih specifikacijah za oceno kakovosti ali kateri koli drug namen.
OPOMBA: Podrobne specifikacije so lahko specifikacije v sistemu IEC, drug sistem specifikacij, povezan z IEC,
ali specifikacije, ki jih določi proizvajalec ali uporabnik. Priprava popolne podrobne specifikacije s strani tehničnega odbora IEC 40,
če je potrebna, upošteva pravila, opisana v dodatku A.

General Information

Status
Published
Publication Date
06-Dec-2018
Current Stage
6060 - Document made available
Due Date
08-Jul-2019

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SLOVENSKI STANDARD
SIST EN IEC 61051-1:2019
01-februar-2019
1DGRPHãþD
SIST EN 61051-1:2009

Varistorji za elektronsko opremo - 1. del: Rodovna specifikacija (IEC 61051-1:2018)

Varistors for use in electronic equipment - Part 1: Generic specification (IEC 61051-

1:2018)

Varistoren zur Verwendung in Geräten der Elektronik - Teil 1: Fachgrundspezifikation

(IEC 61051-1:2018)

Varistances utilisées dans les équipements électroniques - Partie 1: Spécification

générique (IEC 61051-1:2018)
Ta slovenski standard je istoveten z: EN IEC 61051-1:2018
ICS:
31.040.99 Drugi upori Other resistors
SIST EN IEC 61051-1:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 61051-1:2019
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SIST EN IEC 61051-1:2019
EUROPEAN STANDARD EN IEC 61051-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2018
ICS 31.040.99 Supersedes EN 61051-1:2008
English Version
Varistors for use in electronic equipment - Part 1: Generic
specification
(IEC 61051-1:2018)

Varistances utilisées dans les équipements électroniques - Varistoren zur Verwendung in Geräten der Elektronik - Teil

Partie 1: Spécification générique 1: Fachgrundspezifikation
(IEC 61051-1:2018) (IEC 61051-1:2018)

This European Standard was approved by CENELEC on 2018-12-03. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61051-1:2018 E
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SIST EN IEC 61051-1:2019
EN IEC 61051-1:2018 (E)
European foreword

The text of document 40/2621/FDIS, future edition 3 of IEC 61051-1, prepared by IEC/TC 40

"Capacitors and resistors for electronic equipment" was submitted to the IEC-CENELEC parallel vote

and approved by CENELEC as EN IEC 61051-1:2018.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2019-09-03

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2021-12-03

document have to be withdrawn
This document supersedes EN 61051-1:2008.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61051-1:2018 was approved by CENELEC as a European

Standard without any modification.
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SIST EN IEC 61051-1:2019
EN IEC 61051-1:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60027 series Letter symbols to be used in electrical EN 60027 series
technology
IEC 60050 series International Electrotechnical Vocabulary - -
IEC 60062 - Marking codes for resistors and capacitors EN 60062 -
IEC 60068-1 2013 Environmental testing - Part 1: General and EN 60068-1 2014
guidance

IEC 60068-2-1 2007 Environmental testing - Part 2-1: Tests - Test EN 60068-2-1 2007

A: Cold

IEC 60068-2-2 2007 Environmental testing - Part 2-2: Tests - Test EN 60068-2-2 2007

B: Dry heat

IEC 60068-2-6 2007 Environmental testing - Part 2-6: Tests - Test EN 60068-2-6 2008

Fc: Vibration (sinusoidal)

IEC 60068-2-13 1983 Basic environmental testing procedures - Part EN 60068-2-13 1999

2-13: Tests - Test M: Low air pressure

IEC 60068-2-14 2009 Environmental testing - Part 2-14: Tests - Test EN 60068-2-14 2009

N: Change of temperature

IEC 60068-2-20 2008 Environmental testing - Part 2-20: Tests - Test EN 60068-2-20 2008

T: Test methods for solderability and
resistance to soldering heat of devices with
leads

IEC 60068-2-21 2006 Environmental testing - Part 2-21: Tests - Test EN 60068-2-21 2006

U: Robustness of terminations and integral
mounting devices
IEC 60068-2-21 2012 Environmental testing - Part 2-21: Tests - Test - -
Corrigendum 1 U: Robustness of terminations and integral
mounting devices; Corrigendum 1

IEC 60068-2-27 2008 Environmental testing - Part 2-27: Tests - Test EN 60068-2-27 2009

Ea and guidance: Shock
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SIST EN IEC 61051-1:2019
EN IEC 61051-1:2018 (E)

IEC 60068-2-30 2005 Environmental testing - Part 2-30: Tests - Test EN 60068-2-30 2005

Db: Damp heat, cyclic (12 h + 12 h cycle)

IEC 60068-2-45 1980 Basic environmental testing procedures - Part EN 60068-2-45 1992

2-45: Tests - Test XA and guidance:
Immersion in cleaning solvents
+A1 1993 - -

IEC 60068-2-58 2015 Environmental testing - Part 2-58: Tests - Test EN 60068-2-58 2015

Td: Test methods for solderability, resistance
to dissolution of metallization and to soldering
heat of surface mounting devices (SMD)

IEC 60068-2-69 2017 Environmental testing - Part 2-69: Tests - Test EN 60068-2-69 2017

Te/Tc: Solderability testing of electronic
components and printed boards by the wetting
balance (force measurement) method

IEC 60068-2-78 2012 Environmental testing - Part 2-78: Tests - Test EN 60068-2-78 2013

Cab: Damp heat, steady state
IEC 60294 - Measurement of the dimensions of a cylindrical EN 60294 -
component with axial terminations
IEC 60617 - Graphical symbols for diagrams - -

IEC 60695-11-5 2016 Fire hazard testing - Part 11-5: Test flames - EN 60695-11-5 2017

Needle-flame test method - Apparatus,
confirmatory test arrangement and guidance
IEC 60717 2012 Method for the determination of the space EN 60717 2012
required by capacitors and resistors with
unidirectional terminations

IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - Part 4-2: EN 61000-4-2 2009

Testing and measurement techniques -
Electrostatic discharge immunity test
IEC 61193-2 - Quality assessment systems - Part 2: Selection EN 61193-2 -
and use of sampling plans for inspection of
electronic components and packages
IEC 61249-2-7 2002 Materials for printed boards and other EN 61249-2-7 2002
interconnecting structures - Part 2-7:
Reinforced base materials clad and unclad -
Epoxide woven E-glass laminated sheet of
defined flammability (vertical burning test),
copper-clad
- - + corrigendum Sep. 2005
ISO 80000-1 2009 Quantities and units - Part 1: General EN ISO 80000-1 2013
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SIST EN IEC 61051-1:2019
IEC 61051-1
Edition 3.0 2018-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Varistors for use in electronic equipment –
Part 1: Generic specification
Varistances utilisées dans les équipements électroniques –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.99 ISBN 978-2-8322-6089-0

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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SIST EN IEC 61051-1:2019
– 2 – IEC 61051-1:2018 © IEC 2018
CONTENTS

FOREWORD ......................................................................................................................... 7

1 Scope ............................................................................................................................ 9

2 Normative references .................................................................................................... 9

3 Terms and definitions .................................................................................................. 10

4 Technical data ............................................................................................................. 15

4.1 Units, symbols and terminology ........................................................................... 15

4.2 Preferred values and characteristics .................................................................... 15

4.3 Marking ............................................................................................................... 15

4.3.1 General ....................................................................................................... 15

4.3.2 Coding ......................................................................................................... 16

5 Quality assessment procedures ................................................................................... 16

5.1 General ............................................................................................................... 16

5.1.1 Overview ..................................................................................................... 16

5.1.2 Applicability of qualification approval ............................................................ 16

5.1.3 Applicability of capability approval ................................................................ 16

5.1.4 Applicability of technology approval .............................................................. 17

5.2 Primary stage of manufacture .............................................................................. 17

5.3 Subcontracting .................................................................................................... 17

5.4 Structurally similar components ........................................................................... 17

5.5 Qualification approval procedures ....................................................................... 18

5.5.1 Eligibility for qualification approval................................................................ 18

5.5.2 Application for qualification approval ............................................................ 18

5.5.3 Test procedure for qualification approval ...................................................... 18

5.5.4 Granting of qualification approval ................................................................. 18

5.5.5 Maintenance of qualification approval ........................................................... 18

5.5.6 Quality conformance inspection .................................................................... 18

5.6 Capability approval procedures ........................................................................... 19

5.6.1 General ....................................................................................................... 19

5.6.2 Eligibility for capability approval .................................................................... 19

5.6.3 Application for capability approval ................................................................ 19

5.6.4 Description of capability ............................................................................... 19

5.6.5 Demonstration and verification of capability .................................................. 20

5.6.6 Programme for capability approval ............................................................... 21

5.6.7 Capability approval test report ...................................................................... 21

5.6.8 Abstract of description of capability .............................................................. 21

5.6.9 Modifications likely to affect the capability approval ...................................... 21

5.6.10 Initial capability approval .............................................................................. 21

5.6.11 Granting of capability approval ..................................................................... 22

5.6.12 Maintenance of capability approval ............................................................... 23

5.6.13 Extension of capability approval ................................................................... 23

5.6.14 Quality conformance inspection .................................................................... 23

5.7 Rework and repair ............................................................................................... 23

5.7.1 Rework ........................................................................................................ 23

5.7.2 Repair ......................................................................................................... 24

5.8 Release for delivery ............................................................................................ 24

5.8.1 General ....................................................................................................... 24

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5.8.2 Certified records of released lots .................................................................. 24

5.8.3 Delayed delivery .......................................................................................... 24

5.8.4 Release for delivery before the completion of Group B tests ......................... 24

5.9 Alternative test methods ...................................................................................... 24

5.10 Unchecked parameters ........................................................................................ 25

5.11 Characteristics and parameters for application reference ..................................... 25

5.12 Technology approval procedures ......................................................................... 25

5.12.1 General ....................................................................................................... 25

5.12.2 Eligibility for technology approval ................................................................. 25

5.12.3 Application of technology approval ............................................................... 25

5.12.4 Description of technology ............................................................................. 25

5.12.5 Demonstration and verification of the technology .......................................... 25

5.12.6 Granting of technology approval ................................................................... 26

5.12.7 Maintenance of technology approval ............................................................. 26

5.12.8 Quality conformance inspection .................................................................... 26

5.12.9 Failure rate level determination .................................................................... 26

5.12.10 Outgoing quality level ................................................................................... 26

6 Test and measurement procedures .............................................................................. 26

6.1 General ............................................................................................................... 26

6.2 Standard atmospheric conditions ......................................................................... 26

6.2.1 Standard atmospheric conditions for testing.................................................. 26

6.2.2 Recovery conditions ..................................................................................... 27

6.2.3 Referee conditions ....................................................................................... 27

6.2.4 Reference conditions ................................................................................... 27

6.3 Drying and recovery ............................................................................................ 27

6.3.1 General ....................................................................................................... 27

6.3.2 Procedure I .................................................................................................. 27

6.3.3 Procedure II ................................................................................................. 27

6.4 Visual examination and check of dimensions ....................................................... 28

6.4.1 Visual examination ....................................................................................... 28

6.4.2 Marking ....................................................................................................... 28

6.4.3 Dimensions (gauging) .................................................................................. 28

6.4.4 Dimensions (detail) ...................................................................................... 28

6.5 General requirements for electrical tests .............................................................. 28

6.6 Varistor voltage ................................................................................................... 29

6.7 Leakage current .................................................................................................. 29

6.8 Capacitance ........................................................................................................ 30

6.9 Voltage proof (for insulated varistors only)........................................................... 30

6.9.1 General ....................................................................................................... 30

6.9.2 V-block method ............................................................................................ 30

6.9.3 Metal ball method ........................................................................................ 30

6.9.4 Foil method .................................................................................................. 30

6.10 Insulation resistance (for insulated varistors only) ................................................ 31

6.10.1 Test procedure ............................................................................................. 31

6.10.2 Measurement and requirements .................................................................... 31

6.11 Clamping voltage ................................................................................................ 31

6.12 ESD clamping voltage (for surface mount electrostatic protective varistors

only) ................................................................................................................... 32

6.13 Maximum peak current ........................................................................................ 32

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SIST EN IEC 61051-1:2019
– 4 – IEC 61051-1:2018 © IEC 2018

6.13.1 Initial measurement ...................................................................................... 32

6.13.2 Test procedure ............................................................................................. 32

6.13.3 Final inspection, measurement and requirements .......................................... 32

6.14 Rated average dissipation power ......................................................................... 32

6.14.1 General ....................................................................................................... 32

6.14.2 Initial measurement ...................................................................................... 33

6.14.3 Test procedure ............................................................................................. 33

6.14.4 Final inspection, measurement and requirements .......................................... 33

6.15 Rated energy ...................................................................................................... 33

6.15.1 General ....................................................................................................... 33

6.15.2 Initial measurement ...................................................................................... 33

6.15.3 Test procedure ............................................................................................. 34

6.15.4 Final inspection, measurement and requirements .......................................... 34

6.16 Electrostatic discharge (ESD) (for surface mount electrostatic protective

varistors only) ..................................................................................................... 35

6.16.1 Initial measurement ...................................................................................... 35

6.16.2 Test procedure ............................................................................................. 35

6.16.3 Final inspection, measurement and requirements .......................................... 35

6.17 Robustness of terminations ................................................................................. 35

6.17.1 General ....................................................................................................... 35

6.17.2 Test Ua – Tensile ....................................................................................... 35

6.17.3 Test Ub – Bending (half of the number of terminations) ................................. 35

6.17.4 Test Uc – Torsion (the other half of the number of terminations) .................... 35

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

integral mounting devices) ............................................................................. 36

6.17.6 Visual examination ....................................................................................... 36

6.17.7 Final measurement ....................................................................................... 36

6.17.8 Robustness of terminations of surface mount varistors .................................. 36

6.18 Resistance to soldering heat ............................................................................... 37

6.18.1 Preconditioning ............................................................................................ 37

6.18.2 Test procedure ............................................................................................. 37

6.18.3 Recovery ..................................................................................................... 38

6.18.4 Final inspection, measurement and requirements .......................................... 38

6.19 Solderability ........................................................................................................ 38

6.19.1 General ....................................................................................................... 38

6.19.2 Test procedure ............................................................................................. 38

6.19.3 Final inspection, measurements and requirements ........................................ 39

6.20 Rapid change of temperature .............................................................................. 39

6.20.1 Initial measurement ...................................................................................... 39

6.20.2 Test procedure ............................................................................................. 39

6.20.3 Final inspection, measurement and requirements .......................................... 39

6.21 Shock ................................................................................................................. 39

6.21.1 Initial measurement ...................................................................................... 39

6.21.2 Test procedure ............................................................................................. 39

6.21.3 Final inspection, measurement and requirements .......................................... 39

6.22 Vibration ............................................................................................................. 40

6.22.1 Initial measurement ...................................................................................... 40

6.22.2 Test procedure ............................................................................................. 40

6.22.3 Final inspection, measurement and requirements .......................................... 40

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IEC 61051-1:2018 © IEC 2018 – 5 –

6.23 Climatic sequence ............................................................................................... 40

6.23.1 General ....................................................................................................... 40

6.23.2 Initial measurement ...................................................................................... 40

6.23.3 Dry heat ....................................................................................................... 40

6.23.4 Damp heat, cyclic, Test Db, first cycle .......................................................... 40

6.23.5 Cold ............................................................................................................. 40

6.23.6 Low air pressure .......................................................................................... 40

6.23.7 Damp heat, cyclic, Test Db, remaining cycles ............................................... 41

6.23.8 Final inspection, measurement and requirements .......................................... 41

6.24 Damp heat, steady state ...................................................................................... 41

6.24.1 Initial measurement ...................................................................................... 41

6.24.2 Test procedure ............................................................................................. 41

6.24.3 Final inspection, measurement and requirements .......................................... 41

6.25 Fire hazard ......................................................................................................... 42

6.26 Endurance at upper category temperature ............................................................ 42

6.26.1 Test system ................................................................................................. 42

6.26.2 Initial measurement ...................................................................................... 42

6.26.3 Mounting of the samples .............................................................................. 42

6.26.4 Test procedure, measurement and requirements .......................................... 43

6.27 Solvent resistance of marking .............................................................................. 43

6.27.1 Test procedure ............................................................................................. 43

6.27.2 Requirements .............................................................................................. 43

6.28 Component solvent resistance ............................................................................. 43

6.28.1 Initial measurements .................................................................................... 43

6.28.2 Test procedure ............................................................................................. 43

6.28.3 Measurement and requirements ................................................................... 44

6.29 Mounting (for surface mount varistors only) ......................................................... 44

Annex A (informative) Rules for the preparation of detail specifications for capacitors

and resistors for electronic equipment ................................................................................. 46

Annex B (normative) Test pulses used in this spec
...

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