1、BRITISH STANDARDBS EN 60738-1-2:2008Thermistors Directly heated positive step-function temperature coefficient Part 1-2: Blank detail specification Heating element application Assessment level EZICS 31.040.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50
2、g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60738-1-2:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008ISBN 978 0 580 58310 0National forewordThis B
3、ritish Standard is the UK implementation of EN 60738-1-2:2008. It is identical to IEC 60738-1-2:2008. It supersedes BS EN 60738-1-2:1999 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EPL/40X, Capacitors and resistors for electronic equipment.A list
4、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 Standard cannot confer immunity from legal o
5、bligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD EN 60738-1-2 NORME EUROPENNE EUROPISCHE NORM April 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Nor
6、mung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60738-1-2:2008 E ICS 31.040.30 Supersedes EN 60738-1-2:1999English version Thermistors - Directly heated positive
7、 step-function temperature coefficient - Part 1-2: Blank detail specification - Heating element application - Assessment level EZ (IEC 60738-1-2:2008) Thermistances basculement coefficient de temprature positif chauffage direct - Partie 1-2: Spcification particulire cadre - Application de llment cha
8、uffant - Niveau dassurance de la qualit EZ (CEI 60738-1-2:2008) Thermistoren - Direkt geheizte temperaturabhngige Widerstnde mit positivem Temperaturkoeffizienten - Teil 1-2: Vordruck fr Bauartspezifikation -Anwendung als Heizelement - Bewertungsstufe EZ (IEC 60738-1-2:2008) This European Standard w
9、as approved by CENELEC on 2008-03-01. 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 su
10、ch 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
11、language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
12、 Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 40/1875/FDIS, future edition 2 of IEC 60738-1-2, prepared by IEC TC 40, Capacitors and resistors for electro
13、nic equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60738-1-2 on 2008-03-01. This European Standard supersedes EN 60738-1-2:1999. EN 60738-1-2:2008 contains changes with respect to the referenced subclauses of the revised generic specification EN 60738-1.
14、This standard is to be used in conjunction with EN 60738-1. The following dates were 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) 2008-12-01 latest date by which the national standards conflicting
15、with the EN have to be withdrawn (dow) 2011-03-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60738-1-2:2008 was approved by CENELEC as a European Standard without any modification. _ BS EN 60738-1-2:2008 2 INTRODUCTION Blank detail specificati
16、on A blank detail specification is a supplementary document to the generic specification and contains requirements for style and layout and minimum content of detail specifications. Detail specifications not complying with these requirements shall not be considered as being in accordance with IEC sp
17、ecifications nor shall they so be described. In the preparation of detail specifications the content of IEC 60738-1:2006, 1.4 shall be taken into account. The numbers between brackets on the first page correspond to the following information which shall be inserted in the position indicated. Identif
18、ication of the detail specification 1 The “International Electrotechnical Commission“ or the National Standards Organization under whose authority the detail specification is drafted. 2 The IEC or National Standards number of the detail specification, date of issue and any further information requir
19、ed by the national system. 3 The number and issue number of the IEC or national generic specification. 4 The IEC number of the blank detail specification. Identification of the thermistor 5 A short description of the type of thermistor. 6 Information on typical construction (if applicable). NOTE Whe
20、n the thermistor is not designed for use on printed boards, this should clearly be stated in the detail specification in this position. 7 Outline drawing with main dimensions which are of importance for interchangeability and/or reference to the national or international documents for outlines. Alte
21、rnatively, this drawing may be given in an annex to the detail specification. 8 Application or group of applications covered and/or assessment level. 9 Reference data on the most important properties, to allow comparison between the various thermistor types. BS EN 60738-1-2:2008 3 1 IEC 60738-1-2-XX
22、X 2 QC 440002 ELECTRONIC COMPONENTS OF ASSESSED IEC 60738-1-2 4 QUALITY IN ACCORDANCE WITH: QC 440002 3 DIRECTLY HEATED POSITIVE STEP-FUNCTION TEMPERATURECOEFFICIENT THERMISTORS 5 Outline drawing: see 1.2 FOR HEATING ELEMENT . angle projection APPLICATION MODIFIED FERRO-ELECTRIC 6 7 CERAMIC MATERIAL
23、 Other shapes are permitted within the dimensions given Assessment level: EZ 8 Information on the availability of components qualified to this detail specification is given in the Register of Approvals. 9 BS EN 60738-1-2:2008 4 THERMISTORS DIRECTLY HEATED POSITIVE STEP-FUNCTION TEMPERATURE COEFFICIE
24、NT Part 1-2: Blank detail specification Heating element application Assessment level EZ 1 General data 1.1 Method(s) of mounting (to be inserted) (See IEC 60738-1:2006, 7.30). 1.2 Dimensions (All dimensions are in millimetres or inches and millimetres; it shall be stated which dimensions are suitabl
25、e for gauging). Dimensioned drawing(s) shall be given in the detail specification. If necessary, the dimensions may be listed in tabular form with reference to styles or codes. 1.3 Coating The detail specification shall state a) whether the thermistor is insulated or non-insulated, b) the material,
26、c) the colour, if applicable. 1.4 Terminations The detail specification shall state whether the terminations are suitable for soldering. If they are not, suitable methods of connection shall be stated for example: welding, clamping or crimping. 1.5 Flammability The detail specification shall state w
27、hether the thermistor is actively or passively flammable if applicable. The test method shall be given in the test schedule. 1.6 Resistance to solvents The detail specification shall state whether the coating and the marking of the thermistor are solvent resistant if applicable. The test methods sha
28、ll be given in the test schedule. 1.7 Packaging The detail specification shall give the following information (if required): a) whether bulk packed or taped and if taped, drawing or references; b) the dimensions of the immediate packaging and the number of thermistors packed; c) the dimensions of th
29、e outer package and the number of immediate packages; d) methods of disposal of the packaging material. BS EN 60738-1-2:2008 5 1.8 Electrical data/Ratings and characteristics The detail specification shall give units and tolerances or limiting values for the following parameters. If necessary, elect
30、rical data may be listed in tabular form, with reference to styles and codes. Upper/Lower category temperatures (UCT/LCT); Operating temperature range at maximum voltage; Maximum voltage (Umax.); Zero-power resistance (RT); Switching temperature (Tb); Either inrush current (Iin); or minimum resistan
31、ce (Rmin.); Either residual current (Ires); or Resistance(Rp); or Final surface temperature (TFS)1. 1.9 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 la
32、test edition of the referenced document (including any amendments) applies. IEC 60068-2-58, Environmental testing 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 60410:1973, Sampling plan
33、s and procedures for inspection by attributes IEC 60738-1:2006, Thermistors Directly heated positive step-function temperature coefficient Part 1: Generic specification 1.10 Marking The marking of the thermistors and package containing the thermistors shall be in accordance with the requirements of
34、IEC 60738-1:2006, 5.2. The details of the marking of the thermistors and package containing the thermistor shall be given in full in the detail specification. 1.11 Ordering information Orders for thermistors covered by this specification shall contain, in clear or in coded form, the following minimu
35、m information: a) style reference; b) maximum continuous a.c. voltage; _ 1Test method shall be given in the detail specification. BS EN 60738-1-2:2008 6 c) number and issue reference of the detail specification. 1.12 Additional information (not for inspection purposes) 1.13 Additional or increased s
36、everities or requirements to those specified in the generic sectional specification NOTE Additions or increased requirements should be specified only when essential. 2 Inspection requirements 2.1 Procedures 2.1.1 For qualification approval, the procedures shall be in accordance with the generic spec
37、ification IEC 60738-1:2006, 6.5. 2.1.2 For quality conformance inspection, the test schedules (tables 1 and 2) include sampling, periodicity, severities and requirements. The formation of inspection lots is covered by the generic specification IEC 60738-1:2006, 6.5.7. The following list applies to t
38、he test schedules developed in Tables 1 and 2: 1) Subclause numbers of tests and performance requirements refer to the generic specification, IEC 60738-1:2006, and clause 1 of this document. 2) Number to be tested: sample size as directly allotted to the code letter for IL in Table IIA of IEC 60410:
39、1973 (Single sampling plan for normal inspection). 3) In these tables: p is the periodicity (in months) n is the sample size c is the acceptance criterion (permitted number of non-conforming items) D indicates a destructive test ND indicates a non-destructive test IL is the inspection level 4) The t
40、emperature at which the zero-power resistance shall be measured is the temperature specified in the detail specification. This temperature shall be stated, where required, in the test schedule. 5) The specimens used for this group may, at the discretion of the manufacturer, be used for any subsequen
41、t group which is identified as being “destructive“. 6) The soldering solderability and soldering resistance to heat tests shall only be applied where the thermistor has terminations which are appropriate for soldering. 7) Where the terminations are stated to be suitable for printed wiring applicatio
42、ns, the appropriate test conditions in IEC 60068-2-58 shall apply. 8) The thermistors shall be mounted by their normal means. 9) The bump test and the shock test are alternatives. The test selected in the detail specification shall be used. 10) The detail specification shall specify which of the end
43、urance tests in groups C4, C5 and D1 respectively are appropriate to the construction and application of the thermistor. 11) Any deviation from annex B of the generic specification shall be given in the detail specification. 12) 100 % testing shall be followed by re-inspection by sampling in order t
44、o monitor outgoing quality level by non-conforming items per million ( 106). The sampling level shall be established by the manufacturer. For the calculation of 106values any parametric failure shall be counted as a non-conforming item. In case one or more non-conforming items occur in a sample, thi
45、s lot shall be rejected. BS EN 60738-1-2:2008 7 Table 1 Test schedule for quality conformance inspection: lot-by-lot Subclause number and test (see list item 1) D or ND Conditions of test (see list item 1) IL n c Performance requirements (see list item 1) (see list item 3) GROUP A INSPECTION (lot-by
46、-lot) Subgroup A0 7.5 Zero-power resistance RTND Temperature:. C Voltage:. V Frequency:. Hz 100 % (see list item 12) As in 7.5.3 Subgroup A1 7.4.1 Visual examinationND S-4 (see item list 2) 0 As in 7.4.1 Subgroup A2 7.4.2 Marking 7.4.3 Dimensions (gauging) ND S-3 (see item list 2) 0 As in 7.4.2 As s
47、pecified in the detail specification GROUP B INSPECTION (lot-by-lot) Subgroup B1 7.28 Surface tempe- rature after 20 min (if specified) ND See detail specification S-2 (see item list 2) 0 7.29 Maximum inrush current(if specified) 7.27 Residual current (if specified) Voltage:. V Ires. mA Subgroup B2
48、7.8 Voltage proof 7.16 Solderability ND (Insulated thermistors only) Method:. Applied voltage:. V a.c.(see list item 6 and 7) Solder bath method S-2 (see item list 2) 0 As in 7.8.4 The terminations shall be uniformly tinned BS EN 60738-1-2:2008 8 Table 2 Test schedule for quantity conformance inspec
49、tion: periodic Subclause number and test (see list item 1) D or ND Conditions of test (see list item 1) Sample size and acceptance criterion (see list item 3) Performance requirements (see list item 1) p n c GROUP C INSPECTION (periodic) Subgroup C1A Part of sample 7.17 Resistance to soldering heat 7.15 Robustness of terminationsD (see list item 6 and 7) Temperature:. C Visual examination Zero-power resistance (Temperature:. C) (Voltage:. V
