EN 60539-2:2004
(Main)Directly heated negative temperature coefficient thermistors - Part 2: Sectional specification - Surface mount negative temperature coefficient thermistors
Directly heated negative temperature coefficient thermistors - Part 2: Sectional specification - Surface mount negative temperature coefficient thermistors
is applicable to surface mount directly heated negative temperature coefficient thermistors, typically made from transition metal oxide materials with semiconducting properties. These thermistors have metallized connecting pads or soldering strips and are intended to be mounted directly on to substrates for hybrid circuits or on to printed boards.
Direkt geheizte temperaturabhängige Widerstände mit negativem Temperaturkoeffizienten - Teil 2: Rahmenspezifikation - Oberflächenmontierbare temperaturabhängige Widerstände mit negativem Temperaturkoeffizienten
Thermistors à coefficient de température négatif à chauffage direct - Partie 2: Spécification intermédiaire - Montage en surface de thermistors à coefficient de température négatif
is applicable to surface mount directly heated negative temperature coefficient thermistors, typically made from transition metal oxide materials with semiconducting properties. These thermistors have metallized connecting pads or soldering strips and are intended to be mounted directly on to substrates for hybrid circuits or on to printed boards.
Directly heated negative temperature coefficient thermistors - Part 2: Sectional specification - Surface mount negative temperature coefficient thermistors (IEC 60539-2:2003)
Ta del IEC 60539 velja za neposredno ogrevane termistorje z negativnim temperaturnim koeficientom za površinsko montažo, običajno izdelanimi iz materialov iz oksidov prehodnih kovin z polprevodniškimi lastnostmi. Ti termistorji imajo metalizirane priključne ploskve ali trakove za mehko spajkanje in so namenjeni za vgradnjo naravnost na substrate za hibridna vezja ali na tiskane plošče.
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SLOVENSKI SIST EN 60539-2:2004
STANDARD
julij 2004
Directly heated negative temperature coefficient thermistors - Part 2: Sectional
specification - Surface mount negative temperature coefficient thermistors (IEC
60539-2:2003)
ICS 31.040.30 Referenčna številka
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
EUROPEAN STANDARD EN 60539-2
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2004
ICS 31.040.30
English version
Directly heated negative temperature coefficient thermistors
Part 2: Sectional specification -
Surface mount negative temperature coefficient thermistors
(IEC 60539-2:2003)
Thermistors à coefficient de température Direkt geheizte temperaturabhängige
négatif à chauffage direct Widerstände mit negativem
Partie 2: Spécification intermédiaire - Temperaturkoeffizienten
Montage en surface de thermistors Teil 2: Rahmenspezifikation -
à coefficient de température négatif Oberflächenmontierbare
(CEI 60539-2:2003) temperaturabhängige Widerstände
mit negativem Temperaturkoeffizienten
(IEC 60539-2:2003)
This European Standard was approved by CENELEC on 2004-02-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60539-2:2004 E
Foreword
The text of document 40/1346/FDIS, future edition 1 of IEC 60539-2, prepared by IEC TC 40,
Capacitors and resistors for electronic equipment, was submitted to the IEC-CENELEC parallel vote
and was approved by CENELEC as EN 60539-2 on 2004-02-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-02-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60539-2:2003 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60539-2:2004
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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 When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
IEC 60068-2-2 1974 Basic environmental testing procedures EN 60068-2-2 1993
Part 2: Tests - Tests B: Dry heat
A1 1993 A1 1993
A2 1994 A2 1994
IEC 60068-2-14 1984 Part 2: Tests - Test N: Change of
temperature
+ A1 1986 EN 60068-2-14 1999
IEC 60068-2-30 1980 Part 2: Tests - Test Db and guidance:
Damp heat, cyclic (12 + 12 hour cycle)
+ A1 1985 EN 60068-2-30 1999
IEC 60068-2-58 1999 Part 2-58: Tests - Test Td: Test EN 60068-2-58 1999
methods for solderability, resistance to
dissolution of metallization and to
soldering heat of surface mounting
devices (SMD)
2) 3)
IEC 60068-2-78 - Part 2-78: Tests - Test Cab: Damp heat, EN 60068-2-78 2001
steady state
IEC 60410 1973 Sampling plans and procedures for - -
inspection by attributes
IEC 60539-1 2002 Directly heated negative temperature EN 60539-1 2002
coefficient thermistors
Part 1: Generic specification
1)
EN 60068-2-2 includes supplement A:1976 to IEC 60068-2-2.
2)
Undated reference.
3)
Valid edition at date of issue.
INTERNATIONAL IEC
STANDARD
60539-2
First edition
2003-11
Directly heated negative temperature
coefficient thermistors –
Part 2:
Sectional specification –
Surface mount negative temperature
coefficient thermistors
© IEC 2003 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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– 2 – 60539-2 © IEC:2003(E)
CONTENTS
FOREWORD . 4
1 General . 6
1.1 Scope . 6
1.2 Normative references . 6
1.3 Information to be given in a detail specification. 6
1.3.1 Outline drawing and dimensions . 7
1.3.2 Mounting. 7
1.3.3 Ratings and characteristics. 7
1.4 Terminology. 7
2 Preferred ratings and characteristics. 7
2.1 Tolerances on rated zero-power resistance . 7
2.2 Climatic categories . 7
3 Quality assessment procedures . 8
3.1 Primary stage of manufacture . 8
3.2 Structurally similar components . 8
3.3 Qualification approval procedures. 8
3.3.1 The manufacturer shall comply with 3.4 of IEC 60539-1. 8
3.4 Quality conformance inspection . 8
3.4.1 Qualification approval on the basis of the fixed sample size
procedure . 8
3.5 Quality conformance inspection .10
3.5.1 Formation of inspection lots .10
3.5.2 Test schedule .11
3.5.3 Delayed delivery .11
3.5.4 Assessment level.11
4 Test and measurement procedures .12
4.1 Mounting .12
4.2 Drying and recovery.12
4.2.1 Drying.12
4.2.2 Recovery .12
4.3 Visual examination and check of dimensions .12
4.3.1 Visual examination.12
4.3.2 Requirements .12
4.3.3 Marking.14
4.3.4 Dimensions.14
4.4 Electrical tests .14
4.4.1 Zero-power resistance .14
4.4.2 B-value or resistance ratio .14
4.4.3 Resistance/temperature characteristic .15
4.5 Thermal tests.15
4.5.1 Dissipation factor (δ).15
4.5.2 Thermal time constant by cooling after self-heating (τ ).15
c
60539-2 © IEC:2003(E) – 3 –
4.6 Resistance to soldering heat .15
4.6.1 Initial measurement .15
4.6.2 Test conditions .15
4.6.3 Recovery .16
4.6.4 Final inspection, measurements and requirements .16
4.7 Solderability .16
4.7.1 Test conditions .16
4.7.2 Recovery .17
4.7.3 Final inspection, measurements and requirements .17
4.8 Rapid change of temperature .17
4.9 Thermal shock.17
4.10 Climatic sequence .18
4.10.1 Initial measurements .18
4.10.2 Dry heat .18
4.10.3 Damp heat (cyclic), first cycle.18
4.10.4 Cold .18
4.10.5 Damp heat (cyclic), remaining cycles.18
4.10.6 Final measurements .19
4.11 Damp heat, steady state.19
4.12 Endurance.19
4.12.1 Endurance at θ and P .19
3 max.
4.12.2 Endurance at upper category temperature .19
4.13 Shear (adhesion) test .20
4.14 Substrate bending test .20
4.15 Component solvent resistance.20
4.16 Solvent resistance of marking.20
Annex A (normative) Guide for the specification and coding of dimensions of surface
mount negative temperature coefficient thermistors .21
Table 1 – Upper and lower category temperatures and duration of the damp heat test.8
Table 2 – Fixed sample size test schedule for qualification approval of surface mount
negative temperature coefficient thermistors Assessment level EZ .10
Table 3 – Lot-by-lot inspection.11
Table 4 – Periodic test .12
Table 5 – Number of cycles .
...
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