Varistors for use in electronic equipment - Part 2: Sectional specification for surge suppression varistors

IEC 61051-2:2021 is a sectional specification and is applicable to metal oxide varistors with symmetrical voltage-current characteristics for use in electronic equipment connected to any AC or DC supply system.
These varistors are designed to protect electronic and other sensitive equipment from high transient surges. Varistors under the scope of this sectional specification are not intended to give primary protection against lightning surges.
These varistors have metallic connections and are intended to be mounted as through hole component or directly on to printed boards.
The object of this document is to prescribe preferred ratings and characteristics and to select from IEC 61051-1 the appropriate quality assessment procedures, tests and measuring methods, and to give general performance requirements for this type of varistors.
This edition includes the following significant technical changes with respect to the previous edition:  
revision for the structure in accordance with ISO/IEC Directives, Part 2) to the extent practicable, and for harmonizing with IEC 61051-1:2018;
Annex X has been added for comparison with the previous edition;
two lists of preferred voltage ratings for disk type and SMD type varistors have been added;
permissible numbers of non-conforming items have been set to zero (zero fault) in the test schedule in 8.4.3.

Varistances utilisées dans les équipements électroniques - Partie 2: Spécification intermédiaire pour varistances pour limitations de surtensions transitoires

L’IEC 61051-2:2021 est une spécification intermédiaire applicable aux varistances à oxyde métallique présentant des caractéristiques de tension-courant symétriques, destinées à être utilisées dans les équipements électroniques reliés à un système d’alimentation en courant alternatif ou continu.
Ces varistances sont conçues pour protéger les équipements électroniques et autres équipements sensibles contre les surtensions transitoires. Les varistances relevant du domaine d’application de la présente spécification intermédiaire ne sont pas destinées à assurer la protection primaire contre la foudre.
Ces varistances disposent de connexions métalliques et sont destinées à être montées en tant que composant à trous traversants ou directement sur les cartes imprimées.
Le présent document a pour but de prescrire les caractéristiques assignées et les caractéristiques préférentielles, de choisir dans l’IEC 61051-1 les procédures d’assurance de la qualité et les méthodes d’essai et de mesure appropriées, et de fixer les exigences de performance générales pour ce type de varistances.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) révision de la structure conformément aux Directives ISO/IEC, Partie 2, dans la mesure du possible, et harmonisation avec l’IEC 61051-1:2018;
b) ajout de l’Annexe X à des fins de comparaison avec l’édition précédente;
c) ajout de deux listes de caractéristiques assignées de tension préférentielles pour les varistances de type disque et de type CMS;
d) nombre admissible d’éléments non conformes fixé à zéro (zéro défaut) dans le programme d’essai en 8.4.3.

General Information

Status
Published
Publication Date
07-Nov-2021
Current Stage
PPUB - Publication issued
Completion Date
08-Nov-2021
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IEC 61051-2
Edition 2.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Varistors for use in electronic equipment –
Part 2: Sectional specification for surge suppression varistors
Varistances utilisées dans les équipements électroniques –
Partie 2: Spécification intermédiaire pour varistances pour limitations de
surtensions transitoires
IEC 61051-2:2021-11(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61051-2
Edition 2.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Varistors for use in electronic equipment –
Part 2: Sectional specification for surge suppression varistors
Varistances utilisées dans les équipements électroniques –
Partie 2: Spécification intermédiaire pour varistances pour limitations de
surtensions transitoires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.20 ISBN 978-2-8322-1045-7

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61051-2:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 Preferred characteristics .................................................................................................. 7

4.1 Climatic categories ................................................................................................. 7

4.2 Voltage ratings ........................................................................................................ 7

4.3 Derating for metal oxide varistors............................................................................ 9

4.3.1 General ........................................................................................................... 9

4.3.2 Derating at increased operating temperatures ................................................. 9

4.3.3 Maximum peak current derating characteristic ............................................... 10

5 Test procedures, test severities and performance requirements .................................... 11

5.1 General ................................................................................................................. 11

5.2 Visual examination and check of dimensions ........................................................ 11

5.3 Electrical tests ...................................................................................................... 11

5.3.1 Varistor voltage ............................................................................................. 11

5.3.2 Leakage current ............................................................................................. 11

5.3.3 Capacitance .................................................................................................. 11

5.3.4 Voltage proof ................................................................................................. 11

5.3.5 Clamping voltage ........................................................................................... 11

5.3.6 Maximum peak current .................................................................................. 11

5.3.7 Rated energy ................................................................................................. 11

5.4 Soldering test........................................................................................................ 12

5.4.1 Resistance to soldering heat .......................................................................... 12

5.4.2 Solderability................................................................................................... 12

5.5 Temperature and climate test ................................................................................ 12

5.5.1 Damp heat, steady state ................................................................................ 12

5.5.2 Endurance at upper category temperature ..................................................... 12

5.5.3 Rapid change of temperature ......................................................................... 12

5.5.4 Climatic sequence ......................................................................................... 12

5.6 Robustness test .................................................................................................... 12

5.6.1 Robustness of terminations ........................................................................... 12

5.6.2 Shock testing ................................................................................................. 12

5.6.3 Vibration ........................................................................................................ 13

5.6.4 Solvent resistance of marking ........................................................................ 13

5.7 Fire hazard (Needle flame test) ............................................................................. 13

6 Marking, packaging and ordering information ................................................................. 13

7 Detail specifications ....................................................................................................... 13

7.1 General ................................................................................................................. 13

7.2 Outline drawing and dimensions ......................................................................... 13

7.3 Mounting ............................................................................................................... 14

7.4 Ratings and characteristics ................................................................................ 14

7.5 Marking ................................................................................................................ 14

7.6 Ordering information ............................................................................................. 14

8 Quality assessment procedure ....................................................................................... 14

8.1 General ................................................................................................................. 14

---------------------- Page: 4 ----------------------
IEC 61051-2:2021 © IEC 2021 – 3 –

8.2 Primary stage of manufacturer .............................................................................. 14

8.3 Structurally similar components ............................................................................ 14

8.4 Qualification approval (QA) ................................................................................... 15

8.4.1 Qualification approval (QA) procedures ......................................................... 15

8.4.2 Fixed sample size procedure ......................................................................... 15

8.4.3 Test schedule ................................................................................................ 15

8.5 Quality conformance inspection ............................................................................ 19

8.5.1 General ......................................................................................................... 19

8.5.2 Formation of inspection lots ........................................................................... 19

8.5.3 Test schedule ................................................................................................ 19

8.5.4 Assessment level ........................................................................................... 19

Annex X (informative) Cross-references to the previous edition of this document ................. 21

Figure 1 – Typical temperature derating curve for maximum continuous voltage, surge

current, energy absorption and average power dissipation .................................................... 10

Figure 2 – Typical maximum peak current derating curve ...................................................... 10

Table 1 – Upper and lower category temperature and duration of the damp heat,

steady state test ..................................................................................................................... 7

Table 2 – Preferred voltage ratings for disk type varistors ....................................................... 8

Table 3 – Preferred voltage ratings for SMD types .................................................................. 9

Table 4 – Test schedule for the qualification approval ........................................................... 16

Table 5 – Test schedule for the qualification approval ........................................................... 20

Table 6 – Periodic inspection ................................................................................................ 20

Table X.1 – Cross-references ............................................................................................... 21

---------------------- Page: 5 ----------------------
– 4 – IEC 61051-2:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
VARISTORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 2: Sectional specification for surge suppression varistors
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

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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.

IEC 61051-2 has been prepared by IEC technical committee 40: Capacitors and resistors for

electronic equipment. It is an International Standard.
This second edition cancels and replaces the first edition published in 1991 and
Amendment 1:2009. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) revision for the structure in accordance with ISO/IEC Directives, Part 2) to the extent

practicable, and for harmonizing with IEC 61051-1:2018;
b) Annex X has been added for comparison with the previous edition;

c) two lists of preferred voltage ratings for disk type and SMD type varistors have been added;

d) permissible numbers of non-conforming items have been set to zero (zero fault) in the test

schedule in 8.4.3.
---------------------- Page: 6 ----------------------
IEC 61051-2:2021 © IEC 2021 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
40/2877/FDIS 40/2895/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

A list of all parts in the IEC 61051 series, published under the general title Varistors for use in

electronic equipment, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 7 ----------------------
– 6 – IEC 61051-2:2021 © IEC 2021
VARISTORS FOR USE IN ELECTRONIC EQUIPMENT –
Part 2: Sectional specification for surge suppression varistors
1 Scope

This part of IEC 61051 is a sectional specification and is applicable to metal oxide varistors with

symmetrical voltage-current characteristics for use in electronic equipment connected to any

AC or DC supply system.

These varistors are designed to protect electronic and other sensitive equipment from high

transient surges. Varistors under the scope of this sectional specification are not intended to

give primary protection against lightning surges.

These varistors have metallic connections and are intended to be mounted as through hole

component or directly on to printed boards.

The object of this document is to prescribe preferred ratings and characteristics and to select

from IEC 61051-1 the appropriate quality assessment procedures, tests and measuring

methods, and to give general performance requirements for this type of varistors.

2 Normative references

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.
IEC 60062, Marking codes for resistors and capacitors
IEC 60068-1, Environmental testing – Part 1: General and guidance
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat

IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

IEC 60068-2-20, Environmental testing – Part 2-20: Tests – Test Ta and Tb: Test methods for

solderability and resistance to soldering heat of devices with leads

IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock

IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic (12 h +

12 h cycle)

IEC 60068‑2‑45, Basic environmental testing procedures – Part 2-45: Tests – Test XA and

guidance: Immersion in cleaning solvents

IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –

Apparatus, confirmatory test arrangement and guidance
---------------------- Page: 8 ----------------------
IEC 61051-2:2021 © IEC 2021 – 7 –

IEC 61051-1:2018, Varistors for use in electronic equipment – Part 1: Generic specification

IEC 61051-2-2, Varistors for use in electronic equipment – Part 2: Blank detail specification for

zinc oxide surge suppression varistors. Assessment level E

IEC 61193-2:2007, Quality assessment systems – Part 2: Selection and use of sampling plans

for inspection of electronic components and packages
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61051-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Preferred characteristics
4.1 Climatic categories

The varistors covered by this specification are classified into climatic categories according to

the general rules given in IEC 60068-1.

The upper and lower category temperatures and the duration of the damp-heat steady-state

test shall be selected from Table 1.
Table 1 – Upper and lower category temperature and duration
of the damp heat, steady state test
Lower category temperature [°C] −55, −40, −25, −10
Upper category temperature [°C] +70, +85, +100, +105, +125, +155
4, 10, 21, 56
Duration of damp heat, steady state test [days]
Not applicable to unprotected types which have a -/-/00 category.
4.2 Voltage ratings

Table 2 and Table 3 provide preferred voltage ratings for disk type varistors and SMD type

varistors.
---------------------- Page: 9 ----------------------
– 8 – IEC 61051-2:2021 © IEC 2021
Table 2 – Preferred voltage ratings for disk type varistors
Varistor Clamping voltage ,
Max. continuous voltage
voltage U U
V CLP
(V) (V)
U U 8/20, U
RMS DCM CLP
(V) (V)
18 11 14 36
22 14 18 43
27 17 22 53
33 20 26 65
39 25 31 77
47 30 38 93
56 35 45 110
68 40 56 135
82 50 65 135
100 60 85 165
120 75 100 200
150 95 125 250
180 115 150 300
200 130 170 340
220 140 180 360
240 150 200 395
275 175 225 455
300 195 250 505
330 210 270 545
360 230 300 595
390 250 320 650
430 275 350 710
470 300 385 775
510 320 410 845
560 350 450 930
620 385 505 1 025
680 420 560 1 120
715 440 585 1 180
750 460 615 1 240
820 510 670 1 355
910 550 745 1 500
1 000 625 825 1 650
1 100 680 895 1 815
1 200 750 970 2 000
1 600 1 000 1 280 2 650
1 800 1 100 1 465 2 970
Unless otherwise specified, measured at 1 mA
measured at class current which is given by detail specification
---------------------- Page: 10 ----------------------
IEC 61051-2:2021 © IEC 2021 – 9 –
Table 3 – Preferred voltage ratings for SMD types
Varistor Maximum continuous voltage
Voltage U
U U
RMS DCM
(V) (V) (V)
(5,6 ± 20) % 2,5 4
(6,8 ± 20) % 3,5 4,5
(8,2 ± 20) % 4 5,5
(10 ± 20) % 5 7
(12 ± 20) % 6 8,5
(15 ± 20) % 7,5 10,5
(18 ± 20) % 9 13
(22 ± 10) % 14 18
(27 ± 10) % 17 22
(33 ± 10) % 20 26
(39 ± 10) % 25 31
(47 ± 10) % 30 38
(56 ± 10) % 35 45
(68 ± 10) % 40 56
(82 ± 10) % 50 65
4.3 Derating for metal oxide varistors
4.3.1 General

Derating is the intentional reduction of maximum ratings in the application of a device. For metal

oxide varistors derating is of particular interest under the following conditions:

• derating at increased operating temperatures;
• derating for repetitive maximum peak current.
4.3.2 Derating at increased operating temperatures

For operating temperatures exceeding the maximum operating temperature as specified in the

component specification, the following operating conditions of varistors may be derated as

demonstrated in Figure 1:
• maximum continuous voltage;
• surge current;
• energy absorption;
• average power dissipation.
---------------------- Page: 11 ----------------------
– 10 – IEC 61051-2:2021 © IEC 2021
Figure 1 – Typical temperature derating curve for maximum continuous voltage,
surge current, energy absorption and average power dissipation
4.3.3 Maximum peak current derating characteristic

A typical feature of metal oxide varistors is the dependence of the maximum permissible ratings

for surge current, and thus for energy absorption, on the pulse shape, pulse duration, and the

number of times this load is repeated during the overall lifetime of the varistor.

IEC 61051-1:2018, Clause C.2 applies.
Figure 2 – Typical maximum peak current derating curve
---------------------- Page: 12 ----------------------
IEC 61051-2:2021 © IEC 2021 – 11 –
5 Test procedures, test severities and performance requirements
5.1 General

Test severities and requirements prescribed by detail specifications referring to this sectional

specification shall be of equal or superior performance level. Inferior performance levels are

not permitted.

The severities for the tests shall be prescribed by the detail specifications, following the

prescriptions of the generic specification IEC 61051-1 and Clause 5 (Test procedures, test

severities and performance requirements) of this sectional specification.
5.2 Visual examination and check of dimensions
IEC 61051-1:2018, 6.4 applies.

Visual examination shall be carried out with suitable equipment with approximately 10×

magnification and lighting appropriate to the specimen under test and the quality level required.

The operator should have facilities available for incident or transmitted illumination as well as

an appropriate measuring facility.
5.3 Electrical tests
5.3.1 Varistor voltage
IEC 61051-1:2018, 6.6 applies.

Usually, the varistor voltage will be measured at a current of 1 mA. If conditions are different

from IEC 61051-1:2018, 6.6, they shall be prescribed in the detail specification.

5.3.2 Leakage current
IEC 61051-1:2018, 6.7 applies.
5.3.3 Capacitance
IEC 61051-1:2018, 6.8 applies.
5.3.4 Voltage proof
IEC 61051-1:2018, 6.9 applies.
5.3.5 Clamping voltage
IEC 61051-1:2018, 6.11 applies.
5.3.6 Maximum peak current
IEC 61051-1:2018, 6.13 applies.

The pulse current test and the combination pulse test are considered to be alternative. The

detail specification shall indicate which test is performed.
5.3.7 Rated energy
IEC 61051-1:2018, 6.15 applies.
---------------------- Page: 13 ----------------------
– 12 – IEC 61051-2:2021 © IEC 2021
5.4 Soldering test
5.4.1 Resistance to soldering heat
IEC 61051-1:2018, 6.18 applies.
± 5) ° C, 10 s applies.
IEC 60068-2-20:2008, Test Tb, Method 1, solder bath conditions: (260
5.4.2 Solderability
IEC 61051-1:2018, 6.19 applies.

IEC 60068-2-20, Test Ta, Method 1 Soldering bath conditions: Pb- free solder: (245 ± 3) °C,

3 s applies.
5.5 Temperature and climate test
5.5.1 Damp heat, steady state
IEC 61051-1:2018, 6.24 applies.
5.5.2 Endurance at upper category temperature
IEC 61051-1:2018, 6.26 applies.
5.5.3 Rapid change of temperature
IEC 61051-1:2018, 6.20 applies.
5.5.4 Climatic sequence
IEC 61051-1:2018, 6.23 applies.
5.6 Robustness test
5.6.1 Robustness of terminations
IEC 61051-1:2018, 6.17 applies.
5.6.2 Shock testing
5.6.2.1 Gener
...

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