EN IEC 60738-1:2022

SLOVENSKI STANDARD
01-januar-2023
Nadomešča:
SIST EN 60738-1:2007
SIST EN 60738-1:2007/A1:2010
Termistorji - Neposredno ogrevani s pozitivnim temperaturnim koeficientom - 1.
del: Splošna specifikacija (IEC 60738-1:2022)
Thermistors - Directly heated positive temperature coefficient - Part 1: Generic
specification (IEC 60738-1:2022)
Direkt geheizte temperaturabhängige Widerstände mit positivem Temperaturkoeffizienten
– Teil 1: Fachgrundspezifikation (IEC 60738-1:2022)
Thermistances - Coefficient de température positif à chauffage direct - Partie 1:
Spécification générique (IEC 60738-1:2022)
Ta slovenski standard je istoveten z: EN IEC 60738-1:2022
ICS:
31.040.30 Termistorji Thermistors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60738-1

NORME EUROPÉENNE
EUROPÄISCHE NORM November 2022
ICS 31.040.30 Supersedes EN 60738-1:2006; EN 60738-1:2006/A1:2009
English Version
Thermistors - Directly heated positive temperature coefficient -
Part 1: Generic specification
(IEC 60738-1:2022)
Thermistances - Coefficient de température positif à Direkt geheizte temperaturabhängige Widerstände mit
chauffage direct - Partie 1: Spécification générique positivem Temperaturkoeffizienten - Teil 1:
(IEC 60738-1:2022) Fachgrundspezifikation
(IEC 60738-1:2022)
This European Standard was approved by CENELEC on 2022-11-18. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60738-1:2022 E

European foreword
The text of document 40/2969/FDIS, future edition 4 of IEC 60738-1, 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 60738-1:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-08-18
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-11-18
document have to be withdrawn
This document supersedes EN 60738-1:2006 and all of its amendments and corrigenda (if any).
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60738-1:2022 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60068-2-45:1980 NOTE Harmonized as EN 60068-2-45:1992 (not modified)
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 Letters symbols to be used in electrical - series
technology
IEC 60050 series International Electrotechnical Vocabulary - -
(IEV)
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 - EN 60068-2-1 2007
Test A: Cold
IEC 60068-2-2 2007 Environmental testing - Part 2-2: Tests - EN 60068-2-2 2007
Test B: Dry heat
IEC 60068-2-6 - Environmental testing - Part 2-6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC 60068-2-11 - Environmental testing - Part 2-11: Tests - EN IEC 60068-2-11 -
Test Ka: Salt mist
IEC 60068-2-13 - Environmental testing - Part 2-13: Tests - EN IEC 60068-2-13 -
Test M: Low air pressure
IEC 60068-2-14 - Environmental testing - Part 2-14: Tests - EN 60068-2-14 -
Test N: Change of temperature
IEC 60068-2-20 - Environmental testing - Part 2-20: Tests - EN IEC 60068-2-20 -
Test Ta and Tb: Test methods for
solderability and resistance to soldering
heat of devices with leads
IEC 60068-2-21 - Environmental testing - Part 2-21: Tests - EN IEC 60068-2-21 -
Test U: Robustness of terminations and
integral mounting devices
IEC 60068-2-27 - Environmental testing - Part 2-27: Tests - EN 60068-2-27 -
Test Ea and guidance: Shock
IEC 60068-2-30 - Environmental testing - Part 2-30: Tests - EN 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
Publication Year Title EN/HD Year
IEC 60068-2-58 - Environmental testing - Part 2-58: Tests - EN 60068-2-58 -
Test Td: Test methods for solderability,
resistance to dissolution of metallization
and to soldering heat of surface mounting
devices (SMD)
IEC 60068-2-78 - Environmental testing - Part 2-78: Tests - EN 60068-2-78 -
Test Cab: Damp heat, steady state
IEC 60294 - Measurement of the dimensions of a EN 60294 -
cylindrical component with axial
terminations
IEC 60617 - Standard data element types with - -
associated classification scheme for
electric components - Part 4: IEC reference
collection fo standard data element types
and component classes
IEC 60717 - Method for the determination of the space EN 60717 -
required by capacitors and resistors with
unidirectional terminations
IEC 61193-2 - Quality assessment systems - Part 2: EN 61193-2 -
Selection and use of sampling plans for
inspection of electronic components and
packages
IEC 61249-2-7 - Materials for printed boards and other EN 61249-2-7 -
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
IEC 61760-1 - Surface mounting technology - Part 1: EN IEC 61760-1 -
Standard method for the specification of
surface mounting components (SMDs)
ISO 80000-1 - Quantities and units - Part 1: General EN ISO 80000-1 -

IEC 60738-1 ®
Edition 4.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Thermistors – Directly heated positive temperature coefficient –

Part 1: Generic specification
Thermistances – Coefficient de température positif à chauffage direct –

Partie 1: Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.30 ISBN 978-2-8322-5731-9

– 2 – IEC 60738-1:2022 © IEC 2022
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 General requirements . 19
4.1 Units and symbols. 19
4.2 Preferred values . 20
4.2.1 Climatic categories . 20
4.2.2 Spacings . 20
4.3 Marking . 20
4.3.1 General . 20
4.3.2 Coding . 21
5 General provisions for measurements and test method . 21
5.1 General . 21
5.2 Standard conditions for testing . 21
5.2.1 Standard atmospheric conditions for testing . 21
5.2.2 Error of measurement . 21
5.3 Drying and recovery . 21
5.3.1 Drying . 21
5.3.2 Recovery . 22
5.3.3 Shock test severities . 22
5.3.4 Vibration severities . 22
5.4 Mounting (for surface mount thermistors only) . 22
5.4.1 General . 22
5.4.2 Printed wiring board and land pattern . 23
5.4.3 Wave soldering method . 23
5.4.4 Reflow soldering method . 23
6 Electrical tests and measurements . 24
6.1 Zero-power resistance . 24
6.1.1 General . 24
6.1.2 Measurement procedures . 24
6.1.3 Requirements . 25
6.2 Temperature coefficient of resistance . 25
6.2.1 General . 25
6.2.2 Requirements . 25
6.3 Insulation resistance (for insulated types only) . 25
6.3.1 General . 25
6.3.2 Test methods . 25
6.3.3 Applied voltage . 26
6.3.4 Requirements . 26
6.4 Voltage proof (for insulated types only) . 26
6.4.1 General . 26
6.4.2 Test methods . 26
6.4.3 Test voltage . 26
6.4.4 Requirements . 26
6.5 Resistance/temperature characteristic . 26

IEC 60738-1:2022 © IEC 2022 – 3 –
6.5.1 Test methods . 26
6.5.2 Requirements . 27
6.6 Dissipation factor at U (δ) . 27
max
6.6.1 General . 27
6.6.2 Preconditioning . 27
6.6.3 Test circuit . 27
6.6.4 Test methods . 27
6.6.5 Requirements . 28
6.7 Response time by ambient temperature change (t ) . 28
a
6.7.1 General . 28
6.7.2 Preconditioning . 28
6.7.3 Test procedures . 28
6.7.4 Measurement procedures . 29
6.7.5 Requirements . 29
6.8 Response time by power change (t ) . 29
p
6.8.1 Mounting . 29
6.8.2 Test methods . 29
6.9 Thermal time constant by ambient temperature change (τ ) . 30
a
6.10 Thermal time constant by cooling (τ ) . 30
c
6.10.1 Mounting . 30
6.10.2 Test methods . 30
6.10.3 Requirements . 32
6.11 Tripping current and tripping time. 32
6.12 Non-tripping current . 32
6.13 Residual current. 32
6.14 Surface temperature . 33
6.15 Inrush current . 34
6.15.1 Measuring circuit . 34
6.15.2 Measuring method . 34
6.16 Energy by discharge . 35
6.16.1 Measuring circuit . 35
6.16.2 Measuring method . 35
7 Mechanical test and measurements . 36
7.1 Visual examination and check of dimensions . 36
7.1.1 Visual examination . 36
7.1.2 Marking . 36
7.1.3 Dimensions (gauging) . 36
7.1.4 Dimensions (detail) . 36
7.2 Robustness of terminations . 36
7.2.1 General . 36
7.2.2 Test Ua – Tensile . 36
7.2.3 Test Ub – Bending . 37
7.2.4 Test Uc – Torsion . 37
7.2.5 Visual examination . 37
7.2.6 Final measurements and requirements . 37
7.3 Vibration . 37
7.4 Shock . 38
7.5 Shear (adhesion) test . 38

– 4 – IEC 60738-1:2022 © IEC 2022
7.5.1 Test conditions . 38
7.5.2 Test methods . 38
7.5.3 Requirements . 38
7.6 Substrate bending test . 38
7.6.1 Mounting . 38
7.6.2 Initial measurements . 39
7.6.3 Test procedures . 39
7.6.4 Measurements . 39
7.6.5 Requirements . 39
7.6.6 Final inspection and requirements . 39
8 Environmental and climatic tests . 39
8.1 Rapid change of temperature . 39
8.2 Climatic sequence. 39
8.2.1 General . 39
8.2.2 Initial measurements . 39
8.2.3 Dry heat . 40
8.2.4 Damp heat (cyclic), first cycle . 40
8.2.5 Cold. 40
8.2.6 Low air pressure . 40
8.2.7 Damp heat (cyclic), remaining cycles . 40
8.2.8 Final measurements . 40
8.3 Damp heat, steady state . 41
8.4 Endurance . 41
8.4.1 Endurance at room temperature (cycling) . 41
8.4.2 Endurance at upper category temperature . 42
8.4.3 Endurance at maximum operating temperature and maximum voltage . 43
8.4.4 Cold environment electrical cycling . 44
8.4.5 Thermal runaway . 45
9 Test related to component assembly . 45
9.1 Solderability . 45
9.1.1 General . 45
9.1.2 Thermistors with leads . 45
9.1.3 Surface mount thermistors . 46
9.2 Resistance to soldering heat . 46
9.2.1 General . 46
9.2.2 Test conditions . 46
9.2.3 The period of recovery . 47
9.2.4 Requirements for except surface mount thermistors . 47
9.2.5 Requirements for surface mount thermistors . 47
10 Quality assessment procedures . 47
Annex A (informative) Mounting for electrical measurements . 48
A.1 Mounting for thermistors without wire terminations . 48
A.2 Mounting for thermistors with wire terminations . 48
A.3 Mounting for surface mount thermistors . 49
Annex B (informative) Mounting for temperature measurements . 51
Annex Q (normative) Quality assessment procedures . 52
Q.1 General . 52
Q.2 Applicability of qualification approval . 52

IEC 60738-1:2022 © IEC 2022 – 5 –
Q.3 Primary stage of manufacture . 52
Q.4 Subcontracting . 52
Q.5 Structurally similar components . 52
Q.5.1 General . 52
Q.5.2 For electrical tests . 53
Q.5.3 For environmental tests . 53
Q.5.4 For visual inspection . 53
Q.5.5 For endurance tests . 53
Q.6 Qualification approval procedures . 53
Q.6.1 Eligibility for qualification approval . 53
Q.6.2 Application for qualification approval . 53
Q.6.3 Test procedure for qualification approval . 53
Q.6.4 Qualification approval based on the fixed sample size procedure. 54
Q.6.5 Granting of qualification approval . 59
Q.6.6 Maintenance of qualification approval . 59
Q.6.7 Quality conformance inspection . 60
Q.7 Rework and repair. 61
Q.7.1 Rework . 61
Q.7.2 Repair . 61
Q.8 Release for delivery . 61
Q.8.1 General . 61
Q.8.2 Release for delivery under qualification approval before the completion
of group B tests . 62
Q.9 Certified test records of released lots . 62
Q.10 Delayed delivery . 62
Q.11 Alternative test methods . 62
Q.12 Manufacture outside the geographical limits . 62
Q.13 Unchecked parameters . 62
Annex X (informative) Cross-references to IEC 60738-1:2009 . 63
Bibliography . 65

Figure 1 – Typical resistance-temperature characteristic and definitions for PTC
thermistors (at zero power) . 12
Figure 2 – Typical R-TNF characteristic for PTC thermistors in sensor applications . 13
Figure 3 – Typical current/voltage characteristic for PTC thermistors . 14
Figure 4 – I against t at U . 17
in dc
Figure 5 – I against t at U . 17
in RMS
Figure 6 – Dissipation factor test circuit . 28
Figure 7 – Temperature gradient . 29
Figure 8 – Circuit for measurement of thermal time constant by cooling . 30
Figure 9 – Circuit for surface temperature measurement . 33
Figure 10 – Measuring circuit . 34
Figure 11 – Measuring circuit . 35
Figure 12 – Circuit for endurance at maximum operating temperature and maximum
voltage . 44
Figure A.1 – Example of a preferred mounting method for thermistors without wire
terminations . 48

– 6 – IEC 60738-1:2022 © IEC 2022
Figure A.2 – Example of a preferred mounting method for thermistors with wire
terminations . 49
Figure A.3 – Example of a preferred mounting method for surface mount thermistors . 50
Figure B.1 – Example of a preferred mounting method for temperature measurement
on cylindrical heating elements . 51

Table 1 – Creepage distances and clearances . 20
Table 2 – Test severities of vibration . 22
Table 3 – Tensile force . 37
Table 4 – Number of cycles per climatic category . 40
Table A.1 – Recommended land dimensions . 50
Table Q.1 – Fixed sample size test schedule for qualification approval of thermistors
for current limitation – Assessment level EZ . 56
Table Q.2 – Fixed sample size test schedule for qualification approval of thermistors
for use as heating elements – Assessment level EZ . 57
Table Q.3 – Fixed sample size test schedule for qualification approval of thermistors
for inrush current application – Assessment level EZ . 58
Table Q.4 – Fixed sample size test schedule for qualification approval of thermistors
for use as temperature sensing elements – Assessment level EZ . 59
Table Q.5 – Quality conformance inspection for lot-by-lot inspection . 60
Table Q.6 – Quality conformance inspection for periodic testing . 61
Table X.1 – Cross-references to the previous edition . 63

IEC 60738-1:2022 © IEC 2022 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
THERMISTORS – DIRECTLY HEATED POSITIVE
TEMPERATURE COEFFICIENT –
Part 1: Generic specification
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
misinterpretation by any end user.
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 60738-1 has been prepared by IEC technical committee 40: Capacitors and resistors for
electronic equipment. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2006 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) Restructured completely to comply with ISO/IEC Directives; categorization and
reorganization of test methods into these categories;
b) Some wordings, figures and references have been revised.

– 8 – IEC 60738-1:2022 © IEC 2022
The text of this International Standard is based on the following documents:
Draft Report on voting
40/2969/FDIS 40/2977/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.
A list of all parts in the IEC 60738 series, published under the general title Thermistors – Directly
heated positive temperature coefficient, can be found on the IEC website.
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/publications.
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.

IEC 60738-1:2022 © IEC 2022 – 9 –
THERMISTORS – DIRECTLY HEATED POSITIVE
TEMPERATURE COEFFICIENT –
Part 1: Generic specification
1 Scope
This part of IEC 60738 describes terms and methods of test for positive step-function
temperature coefficient thermistors, insulated and non-insulated types, typically made from
ferro-electric semi-conductor materials.
It establishes standard terms, inspection procedures and methods of test for use in detail
specifications for qualification approval and for quality assessment systems for electronic
components.
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 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV) (available at
www.electropedia.org)
IEC 60062, Marking codes for resistors and capacitors
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60068-2-1:2007, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2:2007, 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 60068-2-11, Environmental testing – Part 2-11: Tests – Test Ka: Salt mist
IEC 60068-2-13, Environmental testing – Part 2-13: Tests – Test M: Low air pressure
IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature
Amendment 1 (1986)
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 60068-2-21, Environmental testing – Part 2-21: Tests – Test U: Robustness of terminations
and integral mounting devices
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock

– 10 – IEC 60738-1:2022 © IEC 2022
IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 h + 12-hour cycle)
IEC 60068-2-58, Environmental testing – Part 2-58: Tests – Test Td: Test methods for
solderability, resistance to dissolution of metallization and to soldering heat of surface mounting
devices (SMD)
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state
IEC 60294, Measurement of the dimensions of a cylindrical component with axial terminations
IEC 60617, Graphical symbols for diagrams (available at http://std.iec.ch/iec60617)
IEC 60717, Method for determination of the space required by capacitors and resistors with
unidirectional terminations
IEC 61193-2, Quality assessment systems – Part 2: Selection and use of sampling plans for
inspection of electronic components and packages
IEC 61249-2-7, Materials for printed boards and other 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
IEC 61760-1, Surface mounting technology – Part 1: Standard method for the specification of
surface mounting components (SMDs)
ISO 80000-1, Quantities and units – Part 1: General
3 Terms and definitions
For the purposes of this document and subordinate specifications, the following terms and
definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
type
group of components having similar design features and whose similar manufacturing
techniques enable them to be grouped together either for qualification approval or for quality
conformance inspection
Note 1 to entry: A type is generally covered by a single detail specification.
Note 2 to entry: Components described in several detail specifications can, in some cases, be considered as
belonging to the same type, but they are generally covered by a single detail specification.
3.2
style
variation within a type having specific nominal dimensions and characteristics

IEC 60738-1:2022 © IEC 2022 – 11
...