1、BRITISH STANDARDBS EN60738-1:2006Thermistors Directly heated positive temperature coefficient Part 1: Generic specification ICS 31.040.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g
2、38g50g51g60g53g44g42g43g55g3g47g36g58+A1:2009National forewordThis British Standard is the UK implementation of EN 60738-1:2006+A1:2009. It is identical with IEC 60738-1:2006, incorporating amendment 1:2009. It supersedes BS EN 60738-1:2006 which is withdrawn.The start and finish of text introduced
3、or altered by amendment is indicated in the text by tags. Tags indicating changes to IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by !“.The UK participation in its preparation was entrusted to Technical Committee EPL/40X, Capacitors and re
4、sistors for electronic equipment.A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British St
5、andard cannot confer immunity from legal obligations.BS EN 60738-1:2006+A1:2009This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2006 BSI 2010Amendments/corrigenda issued since publicationDate Comments 28 February 2010 Implementation of
6、 IEC amendment 1:2009 with CENELEC endorsement A1:2009ISBN 978 0 580 62547 3EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secre
7、tariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60738-1:2006 E ICS 31.040.30 English version Thermistors - Directly heated positive temperature coefficient Part 1: Generic specifi
8、cation (IEC 60738-1:2006) Thermistances coefficient de temprature positif chauffage direct Partie 1: Spcification gnrique (CEI 60738-1:2006) Direkt geheizte temperaturabhngige Widerstnde mit positivem Temperaturkoeffizienten Teil 1: Fachgrundspezifikation (IEC 60738-1:2006) This European Standard wa
9、s approved by CENELEC on 2006-05-01. 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 suc
10、h 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 l
11、anguage 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, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Li
12、thuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 60738-1:2006+A1 November 2009 Foreword The text of document 40/1651/FDIS, future edition 3 of IEC 60738-1, prepared by IEC TC 40, Capacitors and r
13、esistors for electronic equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60738-1 on 2006-05-01. This European Standard supersedes EN 60738-1:1999. The changes with respect to EN 60738-1:1999 refer to the tables, figures and references. The following dates w
14、ere 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) 2007-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-05-01 Annex ZA has been added by CENE
15、LEC. _ Endorsement notice The text of the International Standard IEC 60738-1:2006 was approved by CENELEC as a European Standard without any modification. _ 2 The text of document 40/1940/CDV, future amendment 1 to IEC 60738-1:2006, prepared by IEC TC 40, Capacitors and resistors for electronic equi
16、pment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 60738-1:2006 on 2009-09-01. The following dates were fixed: latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endors
17、ement (dop) 2010-06-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 2012-09-01 _ Endorsement notice The text of amendment 1:2009 to the International Standard IEC 60738-1:2006 was approved by CENELEC as an amendment to the European Standard wi
18、thout any modification. _ Foreword to amendment A1 BS EN 60738-1:2006+A1:2009EN 60738-1:2006+A1:20093 CONTENTS 1 Scope 6 2 Normative references .6 3 Terms and definitions .7 4 Units and symbols 15 5 Preferred values.16 5.1 Climatic categories 16 5.2 Marking .16 5.3 Spacings .17 6 Quality assessment
19、procedures 17 6.1 General .17 6.2 Primary stage of manufacture 18 6.3 Subcontracting 18 6.4 Structurally similar components .18 6.5 Qualification approval procedures 19 6.6 Rework and repair .26 6.7 Release for delivery.26 6.8 Certified test records of released lots.27 6.9 Delayed delivery27 6.10 Al
20、ternative test methods 27 6.11 Manufacture outside the geographical limits of IECQ NSIs27 6.12 Unchecked parameters 27 7 Test and measurement procedures .27 7.1 General .27 7.2 Standard conditions for testing.28 7.3 Drying and recovery.28 7.4 Visual examination and check of dimensions29 7.5 Zero-pow
21、er resistance .29 7.6 Temperature coefficient of resistance.30 7.7 Insulation resistance (for insulated types only) .30 7.8 Voltage proof (for insulated types only) 31 7.9 Resistance/temperature characteristic31 7.10 Dissipation factor at Umax() 32 7.11 Response time by ambient temperature change (t
22、a) .33 7.12 Response time by power change (tp) .33 7.13 Thermal time constant by ambient temperature change (a) .34 7.14 Thermal time constant by cooling (c) 34 7.15 Robustness of terminations36 7.16 Solderability 37 7.17 Resistance to soldering heat38 7.18 Rapid change of temperature.39 7.19 Vibrat
23、ion39 7.20 Bump 39 7.21 Shock40 BS EN 60738-1:2006+A1:2009EN 60738-1:2006+A1:2009 4 7.22 Climatic sequence .40 7.23 Damp heat, steady state 41 7.24 Endurance.42 7.25 Tripping current and tripping time.45 7.26 Non-tripping current.46 7.27 Residual current 46 7.28 Surface temperature 46 7.29 Inrush cu
24、rrent47 7.30 Mounting (for surface mount thermistors only) 48 7.31 Shear (adhesion) test 49 7.32 Substrate bending test.49 Annex A (normative) Interpretation of sampling plans and procedures as described in IEC 60410 for use within the IEC quality assessment system for electronic components (IECQ) 5
25、0 Annex B (informative) Mounting for electrical measurements (except surface mount types).51 Annex C (informative) Mounting for temperature measurements54 Annex ZA (normative) Normative references to international publications with their corresponding European publications55 Figure 1 Typical resista
26、nce-temperature characteristic and definitions for PTC thermistors (at zero power) .9 Figure 2 Typical R-TNF characteristic for PTC thermistors in sensor applications 10 Figure 3 Typical current/voltage characteristic for PTC thermistors .10 Figure 4 Iinagainst t at Udc13 Figure 5 Iinagainst t at Ur
27、ms.14 Figure 6 Dissipation factor test circuit.32 Figure 7 Temperature gradient .33 Figure 8 Circuit for measurement of thermal time constant by cooling .35 Figure 9 Circuit for endurance at maximum operating temperature and maximum voltage .44 Figure 10 Circuit for surface temperature measurement 4
28、7 Figure 11 Measuring circuit 47 Figure B.1 Example of a preferred mounting method for thermistors without wire terminations51 Figure B.2 Example of a preferred mounting method for thermistors with wire terminations52 Figure B.3 Example of a preferred mounting method for surface mount thermistors .5
29、3 Figure C.1 Example of a preferred mounting method for temperature measurement on cylindrical heating elements .54 Table 1 Creepage distances and clearances.17 Table 2 Fixed sample size test schedule for qualification approval of thermistors for current limitation Assessment level EZ .21 Table 3 Fi
30、xed sample size test schedule for qualification approval of thermistors for use as heating elements Assessment level EZ22 Table 4 Fixed sample size test schedule for qualification approval of thermistors for inrush current application Assessment level EZ 23 BS EN 60738-1:2006+A1:2009EN 60738-1:2006+
31、A1:20095 Table 5 Fixed sample size test schedule for qualification approval of thermistors for use as temperature sensing elements, Assessment level EZ24 Table 6 Quality conformance inspection for lot-by-lot inspection25 Table 7 Quality conformance inspection for periodic testing 26 Table 8 Tensile
32、force .36 Table 9 Number of cycles per climatic category 41 BS EN 60738-1:2006+A1:2009EN 60738-1:2006+A1:20096 THERMISTORS DIRECTLY HEATED POSITIVE TEMPERATURE COEFFICIENT Part 1: Generic specification 1 Scope This part of IEC 60738 describes terms and methods of test for positive step-function temp
33、erature coefficient thermistors, insulated and non-insulated types typically made from ferro-electric semi-conductor materials. It establishes standard terms, inspection procedures and methods of test for use in detail specifications for Qualification Approval and for Quality Assessment Systems for
34、electronic components. 2 Normative references 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. IEC
35、 60027 (all parts), Letter symbols to be used in electrical technology IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV) IEC 60062, Marking codes for resistors and capacitors IEC 60068-1:1988, Environmental testing Part 1: General and guidance Amendment 1 (1992) IEC 60068-2-1:19
36、90, 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 te
37、sting Part 2: Tests Test Ka: Salt mist IEC 60068-2-13, Environmental testing Part 2: Tests Test M: Low air pressure IEC 60068-2-14:1984, Environmental testing Part 2: Tests Test N: Change of temperature Amendment 1 (1986) IEC 60068-2-20:1979, Environmental testing Part 2: Tests Test T: Soldering Ame
38、ndment 2 (1987) IEC 60068-2-21, Environmental testing Part 2-21: Tests Test U: Robustness of terminations and integral mounting devices BS EN 60738-1:2006+A1:2009EN 60738-1:2006+A1:20097 IEC 60068-2-27, Environmental testing Part 2: Tests Test Ea and guidance: Shock IEC 60068-2-29, Environmental tes
39、ting Part 2: Tests Test Eb and guidance: Bump IEC 60068-2-30:2005, Environmental testing Part 2: Tests Test Db: Damp heat, cyclic (12 h + 12-hour cycle) IEC 60068-2-45:1980, Environmental testing Part 2: Tests Test XA and guidance Immersion in cleaning solvents IEC 60068-2-58, Environmental testing
40、Part 2-58: Tests Test Td: Test methods for solderability, resistance to dissolution of metallization and to soldering heat of surface mounting devices (SMD) IEC 60068-2-78, Environmental testing Part 2-78: Tests Test Cab: Damp heat, steady state IEC 60294, Measurement of the dimensions of a cylindri
41、cal component having two axial terminations IEC 60410, Sampling plans and procedures for inspection by attributes IEC 60617 (all parts) DB1: Graphical symbols for diagrams IEC 60717, Method for determination of the space required by capacitors and resistors with unidirectional terminations IEC 61249
42、-2-7, Materials for printed boards and other interconnecting structures Part 2-7: Reinforced base materials clad and unclad Epoxide woven E-glass laminated sheet of defined flammability (vertical burning test), copper-clad IEC 61760-1, Surface mounting technology Part 1: Standard method for the spec
43、ification of surface mounting components (SMDs) IEC QC 001002-3, Rules of Procedure of the IEC Quality Assessment System for Electronic Components (IECQ) Part 3: Approval procedures ISO 1000, SI units and recommendations for the use of their multiples and of certain other units 3 Terms and definitio
44、ns For the purposes of this document, the following terms and definitions apply. 3.1 type group of components having similar design features and the similarity of whose manufacturing techniques enables them to be grouped together either for qualification approval or for quality conformance inspectio
45、n They are generally covered by a single detail specification NOTE Components described in several detail specifications, may, in some cases, be considered as belonging to the same type but they are generally covered by a single detail specification. 1“DB” refers to the IEC on-line database. BS EN 6
46、0738-1:2006+A1:2009EN 60738-1:2006+A1:20098 3.2 style variation within a type having specific nominal dimensions and characteristics 3.3 thermistor thermally sensitive semiconducting resistor which exhibits a significant change in electrical resistance with a change in body temperature 3.4 positive
47、temperature coefficient thermistor thermistor, the resistance of which increases with its increasing temperature throughout the useful part of its characteristic 3.5 positive step-function temperature coefficient thermistor PTC thermistor which shows a step-like increase in its resistance when the i
48、ncreasing temperature reaches a specific value A PTC thermistor will show secondary effects which are to be taken into account 3.6 zero-power resistance RTvalue of the resistance of a PTC thermistor, at a given temperature, under conditions such that the change in resistance due to the internal gene
49、ration 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 (a.c. or d.c.) and, when an a.c. source is used, on the frequency (see 3.8 and 3.9). 3.7 nominal zero-power resistance Rnd.c. resistance value of a thermistor measured at a specified temper
