IEC_PAS_62435-2005.pdf

PUBLICLY AVAILABLE SPECIFICATION IEC PAS 62435Pre-Standard First edition2005-09 Electronic components Long-duration storage of electronic components Guidance for implementation Reference number IEC/PAS 62435:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-line catalogue on the IEC web site(www.iec.ch/searchpub)enables you to search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.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.PUBLICLY AVAILABLE SPECIFICATIONIEC PAS 62435Pre-Standard First edition2005-09 Electronic components Long-duration storage of electronic components Guidance for implementation PRICE CODE IEC 2005 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.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch U For price,see current catalogue Commission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 PAS 62435 IEC:2005(E)CONTENTS FOREWORD.4 INTRODUCTION.5 1 Scope.6 2 Normative references.6 3 Storage decision criteria.6 3.1 Advantages.7 3.1.1 Technical simplicity Rapidity.7 3.1.2 Solution durability.7 3.1.3 Preventive storage.7 3.2 Hazards Drawbacks.7 3.2.1 Generic aging hazard.7 3.2.2 Poor stock dimensioning.7 3.2.3 Incorrect control of reliability during storage.8 3.2.4 Freezing equipment functionalities.8 3.3 Storage cost.8 3.4 Decision criteria.8 4 Purchasing Procurement.9 4.1 List of components.9 4.2 Quantity of components to be stored.9 4.2.1 Production stock.9 4.2.2 Field service stock.9 4.3 When is it worth keeping in stock?.10 4.4 Procurement recommendations.10 5 Technical validation of the components.10 5.1 Purpose.10 5.2 Relevant field.10 5.3 Test selection criteria.11 5.4 Measurements and tests.11 5.4.1 Sampling.11 5.4.2 Visual examination,sealing,solderability.11 5.4.3 Compliance with the electrical specifications.12 5.4.4 Assessment of the supplied batch reliability.13 5.4.5 Manufacturing control check(technological analysis).15 5.5 Sanction.15 6 Conditioning and storage.15 6.1 Type of environment.15 6.2 Elementary storage unit.16 6.3 Stock management.16 6.4 Redundancy.16 6.5 Identification Traceability.16 6.6 Initial packaging.16 6.7 Stabilization bake.17 6.8 Storage conditions.17 6.8.1 Storage area.17 6.8.2 Temperature.17 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.PAS 62435 IEC:2005(E)3 6.8.3 Temperature variations.17 6.8.4 Relative humidity Chemical attacks Contamination.17 6.8.5 Pressure.17 6.8.6 Electrostatic discharges.17 6.8.7 Vibration Mechanical impacts.18 6.8.8 Electromagnetic field Radiation.18 6.8.9 Light.18 6.9 Maintaining storage conditions.18 7 Periodic check of the components.18 7.1 Objectives.18 7.2 Periodicity.19 7.3 Tests during periodic check.19 8 Destocking.19 8.1 Precauti