IEC_60539-1-2008.pdf

IEC 60539-1Edition 2.0 2008-02INTERNATIONAL STANDARD Directly heated negative temperature coefficient thermistors Part 1:Generic specification IEC 60539-1:2008(E)QC 430 000 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,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 either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.?Catalogue of IEC publications:www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.?IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month all new publications released.Available on-line and also by email.?Electropedia:www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary online.?Customer Service Centre:www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance,please visit the Customer Service Centre FAQ or contact us:Email:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.IEC 60539-1Edition 2.0 2008-02INTERNATIONAL STANDARD Directly heated negative temperature coefficient thermistors Part 1:Generic specification INTERNATIONAL ELECTROTECHNICAL COMMISSION XICS 31.040.30 PRICE CODEISBN 2-8318-9584-7QC 430 000 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60539-1 IEC:2008(E)CONTENTS FOREWORD.4 1 General.6 1.1 Scope.6 1.2 Normative references.6 2 Technical data.8 2.1 Units,symbols and terminology.8 2.2 Terms and definitions.8 2.3 Preferred values.16 2.4 Marking.16 3 Quality assessment procedures.17 3.1 General.17 3.2 Primary stage of manufacture.17 3.3 Structurally similar components.17 3.4 Qualification approval procedures.18 3.5 Quality conformance inspection.18 3.6 Certified test records of released lots.18 3.7 Delayed delivery.19 3.8 Release for delivery under qualification approval before the completion of group B tests.19 3.9 Alternative test methods.19 3.10 Unchecked parameters.19 4 Test and measurement procedures.19 4.1 General.19 4.2 Standard atmospheric conditions for testing.19 4.3 Drying and recovery.20 4.4 Mounting(for surface mount thermistors only).20 4.5 Visual examination and check of dimensions.21 4.6 Zero-power resistance.22 4.7 B-value or resistance ratio.22 4.8 Insulation resistance(for insulated types only).23 4.9 Voltage proof(for insulated types only).26 4.10 Resistance/temperature characteristic.26 4.11 Dissipation factor().26 4.12 Thermal time constant by ambient temperature change(a).28 4.13 Thermal time constant by cooling after self-heating(c).28 4.14 Robustness of terminations(not applicable to surface mount thermistors).29 4.15 Resistance to soldering heat.30 4.16 Solderability.31 4.17 Rapid change of temperature.32 4.18 Vibration.32 4.19 Bump.33 4.20 Shock.33 4.21 Free fall(if specified in the detail specification).33 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60539-1 IEC:2008(E)3 4.22 Thermal shock(if specified in the detail specification).34 4.23 Cold(if required by the sectional specification).34 4.24 Dry heat(if required by the sectional specification).34 4.25 Damp heat,steady state.35 4.26 Endurance.35 4.27 Shear(adhesion)test.40 4.28 Substrate bending test.40 4.29 Component solvent resistance.41 4.30 Solvent resistance of marking.41 4.31 Salt mist(if required by the sectional specification).41 4.32 Sealing(if required by the sectional specificat