EN IEC 60068-2-20:2021

Environmental testing - Part 2-20: Tests - Test Ta and Tb: Test methods for solderability and resistance to soldering heat of devices with leads

IEC 60068-2-20:2021 is available as IEC 60068-2-20:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60068-2-20:2021 outlines Tests Ta and Tb, applicable to devices with leads and leads themselves. Soldering tests for surface mounting devices (SMD) are described in IEC 60068‑2‑58. This document provides procedures for determining the solderability and resistance to soldering heat of devices in applications using solder alloys, which are eutectic or near eutectic tin lead (Pb), or lead-free alloys. The procedures in this document include the solder bath method and soldering iron method. The objective of this document is to ensure that component lead or termination solderability meets the applicable solder joint requirements of IEC 61191-3 and IEC 61191-4. In addition, test methods are provided to ensure that the component body can be resistant to the heat load to which it is exposed during soldering. This edition includes the following significant technical changes with respect to the previous edition: - update of and clarification of pre-conditioning (former "aging") and its relation to natural aging.

Umgebungseinflüsse - Teil 2-20: Prüfungen - Prüfung Ta und Tb: Prüfverfahren für die Lötbarkeit und Lötwärmebeständigkeit von Bauelementen mit herausgeführten Anschlüssen

Essais d’environnement - Partie 2-20: Essais - Essais Ta et Tb: Méthodes d'essai de la brasabilité et de la résistance à la chaleur de brasage des dispositifs à broches

IEC 60068-2-20:2021 est disponible sous forme de IEC 60068-2-20:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60068-2-20:2021 décrit les essais Ta et Tb qui s’appliquent aux dispositifs à broches et aux broches elles-mêmes. Les essais de brasage des composants pour montage en surface (CMS) sont décrits dans l’IEC 60068-2-58. Le présent document fournit des procédures pour déterminer la brasabilité et la résistance à la chaleur de brasage des dispositifs dans les applications qui utilisent des alliages de brasure, qui sont soit des brasures étain plomb (Pb) eutectique ou quasi eutectique, soit des alliages de brasure sans plomb. Les procédures du présent document incluent les méthodes dites de bain de brasage et de fer à braser. Le but du présent document est d’assurer que les broches des composants ou la brasabilité de leurs bornes sont en mesure de satisfaire aux exigences applicables aux joints de brasures de l’IEC 61191-3 et de l’IEC 61191-4. De plus, des méthodes d’essai sont fournies pour assurer que le corps du composant peut résister à la charge calorifique à laquelle il est exposé pendant le brasage. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - mise à jour et clarification du préconditionnement (auparavant "vieillissement") et sa relation au vieillissement naturel.

Okoljski preskusi - 2-20. del: Preskusi - Preskusa Ta in Tb: Preskusne metode za določanje spajkljivosti in odpornosti proti toploti spajkanja za komponente z izvodi

General Information

• Status: Published
• Publication Date: 06-May-2021
• ICS: 19.040 - Environmental testing
• Technical Committee: CLC/SR 91 - Electronics assembly technology
• Drafting Committee: IEC/TC 91 - IEC_TC_91
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 07-May-2021
• Completion Date: 07-May-2021
• Ref Project: SIST EN IEC 60068-2-20:2021 - Environmental testing - Part 2-20: Tests - Test T: Test methods for solderability and resistance to soldering heat of devices with leads

Relations

• Replaces: EN 60068-2-20:2008 - Environmental testing - Part 2-20: Tests - Test T: Test methods for solderability and resistance to soldering heat of devices with leads
• Effective Date: 23-Jul-2019

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2021
Nadomešča:
SIST EN 60068-2-20:2009
Okoljski preskusi - 2-20. del: Preskusi - Preskusa Ta in Tb: Preskusne metode za
določanje spajkljivosti in odpornosti proti toploti spajkanja za komponente z
izvodi
Environmental testing - Part 2-20: Tests - Test T: Test methods for solderability and
resistance to soldering heat of devices with leads
Umgebungseinflüsse - Teil 2-20: Prüfungen - Prüfung T: Prüfverfahren für die Lötbarkeit
und Lötwärmebeständigkeit von Bauelementen mit herausgeführten Anschlüssen
Essais d'environnement - Partie 2-20: Essais - Essai T: Méthodes d'essai de la
brasabilité et de la résistance à la chaleur de brasage des dispositifs à broches
Ta slovenski standard je istoveten z: EN IEC 60068-2-20:2021
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60068-2-20

NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2021
ICS 19.040 Supersedes EN 60068-2-20:2008 and all of its
amendments and corrigenda (if any)
English Version
Environmental testing - Part 2-20: Tests - Test Ta and Tb: Test
methods for solderability and resistance to soldering heat of
devices with leads
(IEC 60068-2-20:2021)
Essais d'environnement - Partie 2-20: Essais - Essais Ta et Umgebungseinflüsse - Teil 2-20: Prüfungen - Prüfung Ta
Tb: Méthodes d'essai de la brasabilité et de la résistance à und Tb: Prüfverfahren für die Lötbarkeit und
la chaleur de brasage des dispositifs à broches Lötwärmebeständigkeit von Bauelementen mit
(IEC 60068-2-20:2021) herausgeführten Anschlüssen
(IEC 60068-2-20:2021)
This European Standard was approved by CENELEC on 2021-05-04. 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,
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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60068-2-20:2021 E

European foreword
The text of document 91/1701/FDIS, future edition 6 of IEC 60068-2-20, prepared by IEC/TC 91
"Electronics assembly technology" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60068-2-20:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-02-04
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-05-04
document have to be withdrawn
This document supersedes EN 60068-2-20:2008 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.
Endorsement notice
The text of the International Standard IEC 60068-2-20:2021 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60068-2-58 NOTE Harmonized as EN 60068-2-58
IEC 60068-2-69:2017 NOTE Harmonized as EN 60068-2-69:2017 (not modified)
IEC 61190-1-3:2017 NOTE Harmonized as EN IEC 61190-1-3:2018 (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 60068-1 - Environmental testing - Part 1: General EN 60068-1 -
and guidance
IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60068-2-66 - Environmental testing - Part 2: Test EN 60068-2-66 -
methods - Test Cx: Damp heat, steady
state (unsaturated pressurized vapour)
IEC 60068-2-78 - Environmental testing - Part 2-78: Tests - EN 60068-2-78 -
Test Cab: Damp heat, steady state
IEC 61191-3 - Printed board assemblies - Part 3: EN 61191-3 -
Sectional specification - Requirements
for through-hole mount soldered
assemblies
IEC 61191-4 - Printed board assemblies - Part 4: EN 61191-4 -
Sectional specification - Requirements
for terminal soldered assemblies

IEC 60068-2-20 ®
Edition 6.0 2021-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-20: Tests – Tests Ta and Tb: Test methods for solderability and

resistance to soldering heat of devices with leads

Essais d’environnement –
Partie 2-20: Essais – Essais Ta et Tb: Méthodes d'essai de la brasabilité

et de la résistance à la chaleur de brasage des dispositifs à broches

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-9585-4

– 2 – IEC 60068-2-20:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Test Ta: Solderability of wire and tag terminations . 8
4.1 Objective and general description of the test . 8
4.1.1 Test methods . 8
4.1.2 Specimen preparation . 8
4.1.3 Initial measurements . 9
4.1.4 Preconditioning . 9
4.2 Method 1: Solder bath . 10
4.2.1 General . 10
4.2.2 Description of the solder bath . 10
4.2.3 Flux . 10
4.2.4 Procedure . 10
4.2.5 Test conditions . 11
4.2.6 Final measurements and requirements . 11
4.3 Method 2: Soldering iron at 350 °C . 11
4.3.1 General . 11
4.3.2 Description of soldering irons . 11
4.3.3 Solder and flux . 12
4.3.4 Procedure . 12
4.3.5 Final measurements and requirements . 13
4.4 Information to be given in the relevant specification . 13
5 Test Tb: Resistance to soldering heat . 14
5.1 Objective and general description of the test . 14
5.1.1 Test methods . 14
5.1.2 Initial measurements . 14
5.2 Method 1: Solder bath . 14
5.2.1 Description of the solder bath . 14
5.2.2 Flux . 14
5.2.3 Procedure . 14
5.2.4 Test conditions . 15
5.2.5 De-wetting . 15
5.3 Method 2: Soldering iron . 16
5.3.1 Description of soldering iron . 16
5.3.2 Solder and flux . 16
5.3.3 Procedure . 16
5.4 Recovery . 16
5.5 Final measurements and requirements . 16
5.6 De-wetting (if required) . 16
5.7 Information to be given in the relevant specification . 17
Annex A (informative) Example of apparatus for steam conditioning process . 18
Annex B (normative) Specification for flux constituents . 19
B.1 Colophony . 19
B.2 2-propanol (isopropyl alcohol) . 19

IEC 60068-2-20:2021 © IEC 2021 – 3 –
B.3 Ethyl alcohol . 19
B.4 Flux composition . 19
Bibliography . 21

Figure 1 – Diagram of contact angle . 7
Figure 2 – Position of soldering iron . 12
Figure A.1 – Example of apparatus . 18

Table 1 – Solderability, solder bath method: Test severities (duration and temperature) . 11
Table 2 – Resistance to soldering heat, solder bath method: Test severities (duration
and temperature) . 15
Table B.1 – Colophony based flux compositions . 20

– 4 – IEC 60068-2-20:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-20: Tests –
Tests Ta and Tb: Test methods for solderability
and resistance to soldering
...