1、 INTERNATIONAL STANDARD IEC 62319-1First edition 2005-02Polymeric thermistors Directly heated positive step function temperature coefficient Part 1: Generic specification Reference number IEC 62319-1:2005(E) Publication numbering As from 1 January 1997 all IEC publications are issued with a designat
2、ion 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
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7、tre (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 INTERNATIONAL STANDARD IEC 62319-1First edit
8、ion 2005-02Polymeric thermistors Directly heated positive step function temperature coefficient Part 1: Generic specification 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 photocopyi
9、ng and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch V For price, see current catalogue PR
10、ICE CODE Commission Electrotechnique Internationale International Electrotechnical Commission 2 62319-1 IEC:2005(E) CONTENTS FOREWORD.4 1 General6 1.1 Scope6 1.2 Normative references 6 2 Technical data7 2.1 Units and symbols .7 2.2 Terms and definitions7 2.3 Preferred values10 2.4 Marking.11 3 Quali
11、ty assessment procedures 11 3.1 General.11 3.2 Primary stage of manufacture 11 3.3 Subcontracting 12 3.4 Structurally similar components .12 3.5 Qualification approval procedures 12 3.6 Rework and repair .18 3.7 Release for delivery.18 3.8 Certified test records of released lots.19 3.9 Delayed deliv
12、ery19 3.10 Alternative test methods 19 3.11 Manufacture outside the geographical limits of IECQ NSIs19 3.12 Unchecked parameters 19 4 Test and measurement procedures .19 4.1 Standard conditions for testing.19 4.2 Drying and recovery.20 4.3 Visual inspection and check of dimensions.20 4.4 Zero power
13、resistance .21 4.5 Insulation resistance (for insulated types only) .21 4.6 Voltage proof (for insulated types only) 22 4.7 Robustness of terminations (for leaded types only).22 4.8 Soldering.23 4.9 Mounting .23 4.10 Rapid change of temperature.24 4.11 Climatic sequence .24 4.12 Cycle life testing25
14、 4.13 Trip endurance 27 4.14 Trip current .28 4.15 Hold current 28 4.16 Residual current and power dissipation 29 4.17 Time-to-trip .29 4.18 Cold environmental electrical cycling30 4.19 Thermal runaway.30 62319-1 IEC:2005(E) 3 Annex A (normative) Fixed sample size test schedules for qualification ap
15、proval.31 Annex B (normative) Vibration-, bump-, shock-, shear-, substrate bending test32 B.1 Vibration 32 B.2 Bump .32 B.3 Shock.33 B.4 Shear (adhesion) test .33 B.5 Substrate bending test33 Figure 1 Test schedule flow chart.15 Figure 2 Circuit for Trip endurance .28 Table 1 Fixed sample size test
16、schedule for qualification approval of Polymeric PTC thermistors for current limitation, assessment level EZ.16 Table 2 Quality conformance inspection for lot-by-lot inspection17 Table 3 Quality conformance inspection for periodic testing 18 Table 4 Loading weight for wire terminations 22 Table 5 Nu
17、mber of cycles.25 4 62319-1 IEC:2005(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ POLYMERIC THERMISTORS DIRECTLY HEATED POSITIVE STEP FUNCTION TEMPERATURE COEFFICIENT Part 1: Generic specification FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for stand
18、ardization comprising all national electrotechnical 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 Int
19、ernational Standards, Technical Specifications, 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 participa
20、te in this preparatory work. International, 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 betwee
21、n the two organizations. 2) The formal decisions 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
22、 have the form of recommendations for international 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
23、misinterpretation by any end user. 4) In order 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 n
24、ational or regional publication shall be clearly 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 edit
25、ion of this publication. 7) No liability shall 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 dir
26、ect or indirect, or for costs (including legal 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 indispens
27、able for the correct application of this publication. 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 62319-1 ha
28、s been prepared by IEC technical committee 40: Capacitors and resistors for electronic equipment. The text of this standard is based on the following documents: FDIS Report on voting 40/1505/FDIS 40/1534/RVD Full information on the voting for the approval of this standard can be found in the report
29、on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 62319-1 IEC:2005(E) 5 The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site und
30、er “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 this publication may be issued at a later date. 6 62319-1 IEC:2005(E) POLYMERIC THERMISTORS DIRE
31、CTLY HEATED POSITIVE STEP FUNCTION TEMPERATURE COEFFICIENT Part 1: Generic specification 1 General 1.1 Scope This part of IEC 62319 prescribes terms and methods of test for polymeric positive temperature coefficient thermistors, insulated and non-insulated types, typically intended for use in curren
32、t limiting and overcurrent protection applications. It establishes standard terms, inspection procedures and methods of test for use in detail specifications for Qualification Approval and for Quality Assessment Systems for electronic components. 1.2 Normative references The following referenced doc
33、uments 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. IEC 60027-1: Letter symbols to be used in electrical technology Part 1: Gener
34、al IEC 60050: International Electrotechnical Vocabulary IEC 60068-1: Environmental testing Part 1: General and guidance IEC 60068-2-6: Environmental testing Part 2: Tests Test Fc: Vibration (sinusoidal) IEC 60068-2-14: Environmental testing Part 2: Tests Test N: Change of temperature IEC 60068-2-20:
35、 Environmental testing Part 2: Tests Test T: Soldering IEC 60068-2-21: Environmental testing Part 2-21: Tests Test U: Robustness of terminations and integral mounting devices IEC 60068-2-27: Environmental testing Part 2: Tests Test Ea and guidance: Shock IEC 60068-2-29: Environmental testing Part 2:
36、 Tests Test Eb and guidance: Bump IEC 60068-2-45: Environmental testing Part 2: Tests Test XA and guidance: Immersion in cleaning solvents IEC 60294: Measurement of the dimensions of a cylindrical component having two axial terminations IEC 60410: Sampling plans and procedures for inspection by attr
37、ibutes. 62319-1 IEC:2005(E) 7 IEC 60617-DB: 2001 1Graphical symbols for diagrams IECQ 001003: IEC Quality Assessment System for Electronic Components Guidance documents IECQ 001002-3: IEC Quality Assessment System for Electronic Components Rules of Procedure Part 3: Approval procedures ISO 1000: SI
38、units and recommendations for the use of their multiples and of certain other units 2 Technical data 2.1 Units and symbols Units, graphical symbols, letter symbols and terminology shall, whenever possible, be taken from the following documents: IEC 60027 IEC 60050 IEC 60617 ISO 1000 The following su
39、bclauses contain additional terminology applicable to thermistors. Where further items are required they shall be derived in accordance with the principles of the documents listed above. 2.2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.2.1 the
40、rmistor thermally sensitive semiconducting resistor whose primary function is to exhibit an important change in electrical resistance with a change in body temperature 2.2.2 positive temperature coefficient thermistor thermistor in which the resistance increases with increasing temperature throughou
41、t the useful part of its characteristic. The PTC thermistors covered in this specification typically exhibit a very sharp increase in resistance over a narrow temperature range 2.2.3 directly heated positive temperature coefficient thermistor thermistor in which the change in temperature is obtained
42、 either by the flow of current through the thermo-sensitive element, or by a change in ambient temperature, or by a combination of both of these means _ 1“DB” refers to the IEC on-line database. 8 62319-1 IEC:2005(E) 2.2.4 zero power resistance R Tvalue of the resistance of a PTC thermistor, at a gi
43、ven temperature, under such conditions that the change in resistance due to the internal generation of heat is negligible with respect to the total error of measurement NOTE Any resistance value of a PTC thermistor is dependent on the value and the mode of the applied voltage (AC or DC). 2.2.5 nomin
44、al zero power resistance R nzero power resistance used as a reference value for which the following conditions should be given in the detail specification: a) reference temperature, preferably 25 C b) applied voltage (DC or AC) 2.2.6 resistance/temperature characteristics relationship between the ze
45、ro power resistance of a thermistor and the temperature of the thermosensitive element when measured under specified reference conditions 2.2.7 upper category temperature UCT maximum ambient operating temperature of the thermistor 2.2.8 lower category temperature LCT minimum ambient operating temper
46、ature of the thermistor 2.2.9 trip event event of rapid increasing resistance of the thermistor in response to an overcurrent surge 2.2.10 minimum initial resistance R minminimum resistance of the thermistor 2.2.11 maximum initial resistance R maxmaximum resistance of the thermistor before its initi
47、al trip event 2.2.12 maximum resistance 1 h after tripping R 1maxfor leaded thermistors the maximum resistance of the thermistor 1 h after its first trip event; for surface mount thermistors, the maximum resistance of the thermistor 1 h after reflow 2.2.13 maximum voltage U maxmaximum AC or DC volta
48、ge which may be applied to the thermistor 62319-1 IEC:2005(E) 9 2.2.14 operating temperature range at maximum voltage range of ambient temperatures at which the thermistor can operate at the maximum voltage 2.2.15 isolation voltage (applicable only to insulated thermistors) maximum peak voltage whic
49、h may be applied under continuous operating conditions between any of the thermistor terminations and any conducting surface 2.2.16 maximum current I maxvalue of current for the operating temperature range, which should not be exceeded 2.2.17 residual current I resvalue of current in the tripped thermistor at a specified ambient temperature (preferably 25 C) under steady state conditions;
