1、 INTERNATIONAL STANDARD IEC60738-1QC 440000Third edition2006-04Thermistors Directly heated positive temperature coefficient Part 1: Generic specification Reference number IEC 60738-1:2006(E) Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo re
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9、TANDARD IEC60738-1QC 440000Third edition2006-04Thermistors Directly heated positive temperature coefficient Part 1: Generic specification IEC 2006 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, includin
10、g 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 XA For price, see current
11、cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 2 60738-1 IEC:2006(E)
12、CONTENTS FOREWORD.5 1 Scope.7 2 Normative references .7 3 Terms and definitions .8 4 Units and symbols 16 5 Preferred values.17 5.1 Climatic categories17 5.2 Marking .17 5.3 Spacings .18 6 Quality assessment procedures18 6.1 General .18 6.2 Primary stage of manufacture19 6.3 Subcontracting 19 6.4 St
13、ructurally similar components.19 6.5 Qualification approval procedures .20 6.6 Rework and repair .27 6.7 Release for delivery 27 6.8 Certified test records of released lots 28 6.9 Delayed delivery28 6.10 Alternative test methods28 6.11 Manufacture outside the geographical limits of IECQ NSIs 28 6.12
14、 Unchecked parameters28 7 Test and measurement procedures.28 7.1 General .28 7.2 Standard conditions for testing 29 7.3 Drying and recovery 29 7.4 Visual examination and check of dimensions.30 7.5 Zero-power resistance.30 7.6 Temperature coefficient of resistance31 7.7 Insulation resistance (for ins
15、ulated types only) 31 7.8 Voltage proof (for insulated types only) .32 7.9 Resistance/temperature characteristic.32 7.10 Dissipation factor at Umax() .33 7.11 Response time by ambient temperature change (ta)34 7.12 Response time by power change (tp).34 7.13 Thermal time constant by ambient temperatu
16、re change (a) 35 7.14 Thermal time constant by cooling (c)35 7.15 Robustness of terminations .37 7.16 Solderability 38 7.17 Resistance to soldering heat .39 7.18 Rapid change of temperature 40 7.19 Vibration40 7.20 Bump 40 7.21 Shock41 Copyright International Electrotechnical Commission Provided by
17、IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-60738-1 IEC:2006(E) 3 7.22 Climatic sequence .41 7.23 Damp heat, steady state42 7.24 Endurance.43 7.25 Tripping current and tripping time46 7.26 Non-tripping current 47 7.27 Residual current
18、47 7.28 Surface temperature47 7.29 Inrush current48 7.30 Mounting (for surface mount thermistors only).49 7.31 Shear (adhesion) test 50 7.32 Substrate bending test 50 Annex A (normative) Interpretation of sampling plans and procedures as described in IEC 60410 for use within the IEC quality assessme
19、nt system for electronic components (IECQ) 51 Annex B (informative) Mounting for electrical measurements (except surface mount types) .52 Annex C (informative) Mounting for temperature measurements 55 Figure 1 Typical resistance-temperature characteristic and definitions for PTC thermistors (at zero
20、 power) .10 Figure 2 Typical R-TNF characteristic for PTC thermistors in sensor applications 11 Figure 3 Typical current/voltage characteristic for PTC thermistors 11 Figure 4 Iinagainst t at Udc14 Figure 5 Iinagainst t at Urms15 Figure 6 Dissipation factor test circuit 33 Figure 7 Temperature gradi
21、ent.34 Figure 8 Circuit for measurement of thermal time constant by cooling36 Figure 9 Circuit for endurance at maximum operating temperature and maximum voltage45 Figure 10 Circuit for surface temperature measurement.48 Figure 11 Measuring circuit48 Figure B.1 Example of a preferred mounting method
22、 for thermistors without wire terminations52 Figure B.2 Example of a preferred mounting method for thermistors with wire terminations53 Figure B.3 Example of a preferred mounting method for surface mount thermistors .54 Figure C.1 Example of a preferred mounting method for temperature measurement on
23、 cylindrical heating elements .55 Table 1 Creepage distances and clearances18 Table 2 Fixed sample size test schedule for qualification approval of thermistors for current limitation Assessment level EZ.22 Table 3 Fixed sample size test schedule for qualification approval of thermistors for use as h
24、eating elements Assessment level EZ.23 Table 4 Fixed sample size test schedule for qualification approval of thermistors for inrush current application Assessment level EZ .24 Table 5 Fixed sample size test schedule for qualification approval of thermistors for use as temperature sensing elements, A
25、ssessment level EZ 25 Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 4 60738-1 IEC:2006(E) Table 6 Quality conformance inspection for lot-by-lot inspection 26 Table 7 Qualit
26、y conformance inspection for periodic testing.27 Table 8 Tensile force .37 Table 9 Number of cycles per climatic category .42 Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6
27、0738-1 IEC:2006(E) 5 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 electrot
28、echnical 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 Specificati
29、ons, 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,
30、 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 decis
31、ions 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 intern
32、ational 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 ord
33、er 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 cle
34、arly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability sha
35、ll 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 leg
36、al 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 pub
37、lication. 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. International Standard IEC 60738-1 has been prepared by IEC technical committee 4
38、0: Capacitors and resistors for electronic equipment. This third edition cancels and replaces the second edition published in 1998 and constitutes a minor revision. The changes with respect to the previous edition refer to the tables, figures and references. The text of this standard is based on the
39、 following documents: FDIS Report on voting 40/1651/FDIS 40/1730/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for R
40、esaleNo reproduction or networking permitted without license from IHS-,-,- 6 60738-1 IEC:2006(E) This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The QC number that appears on the front cover of this publication is the specification number in the IEC Quality Asses
41、sment System for Electronic Components (IECQ). IEC 60738 consists of the following parts, under the general title Thermistors Directly heated positive step-function coefficient: Part 1: Generic specification Part 1-1: Blank detail specification Current limiting application Assessment level EZ Part 1
42、-2: Blank detail specification Heating element application Assessment level EZ Part 1-3: Blank detail specification Inrush current application Assessment level EZ Part 1-4: Blank detail specification Sensing application Assessment level EZ The committee has decided that the contents of this publicat
43、ion will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. A bilingual version of thi
44、s standard may be issued at a later date. Copyright International Electrotechnical Commission Provided by IHS under license with IECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-60738-1 IEC:2006(E) 7 THERMISTORS DIRECTLY HEATED POSITIVE TEMPERATURE COEFFICIENT Pa
45、rt 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 proc
46、edures 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 referenced documents are indispensable for the application of this document. For dated references, only the editio
47、n 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) IEC 60062, Marking codes for res
48、istors and capacitors IEC 60068-1:1988, Environmental testing Part 1: General and guidance Amendment 1 (1992) IEC 60068-2-1:1990, Environmental testing Part 2: Tests Tests A: Cold Amendment 1 (1993) Amendment 2 (1994) IEC 60068-2-2:1974, Environmental testing Part 2: Tests Tests B: Dry heat Amendment 1 (1993) IEC 60068-2-6, Environmental testing Part 2: Tests Test Fc: Vibration (sinusoidal) IEC 60068-2-11, Environmental testing Part 2: Tests Test
