1、BSI Standards PublicationBS EN 140402:2015Blank Detail Specification:Fixed low power wirewoundsurface mount (SMD) resistorsBS EN 140402:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 140402:2015. It supersedes BS EN 140402:1998 which is withdrawn.The UK pa
2、rticipation in its preparation was entrusted to Technical Committee EPL/40X, Capacitors and resistors 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 o
3、f a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 78444 6 ICS 31.040.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published und
4、er the authority of the Standards Policy and Strategy Committee on 30 April 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 140402 April 2015 ICS 31.040.10 Supersedes EN 140402:1998 English Version Blank Detail Speci
5、fication: Fixed low power wirewound surface mount (SMD) resistors Spcification particulire cadre: Rsistances fixes bobines faible dissipation pour montage en surface (CMS) Vordruck fr Bauartspezifikation: Oberflchenmontierbare drahtgewickelte Festwiderstnde (SMD) niedriger Belastbarkeit This Europea
6、n Standard was approved by CENELEC on 2014-12-15. 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 c
7、oncerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 CENELE
8、C member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav R
9、epublic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardiz
10、ation Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 140402:2015
11、 E Contents Foreword 4 Introduction 5 1 Characteristics and ratings 7 1.1 General 7 1.2 Dimensions and ratings 7 1.3 Derating curve 8 1.4 Resistance range and tolerance on rated resistance . 8 1.4.1 Level P 8 1.4.2 Level R 9 1.5 Variation of resistance with temperature and temperature rise . 10 1.6
12、Climatic categories 11 1.7 Limits for change of resistance at tests 11 1.8 Non-linearity . 13 1.9 Tests related to soldering . 13 1.9.1 Severities for solderability testing 13 1.9.2 Severities for testing resistance to soldering heat 13 1.10 Marking, packaging and ordering designation . 13 1.10.1 Ma
13、rking of the component . 13 1.10.2 Packaging 13 1.10.3 Marking of the packaging . 13 1.10.4 Ordering information 13 1.11 Additional information (not for inspection purpose) . 14 1.11.1 Storage . 14 1.11.2 Mounting 14 1.11.3 Soldering process . 14 1.11.4 Conductive gluing . 15 1.11.5 Use of cleaning
14、solvents 15 1.11.6 Pulse load capability . 15 1.11.7 Variation of resistance (drift) for lifetimes up to 200 000 h. 15 1.11.8 Dissipation notes 15 2 Quality assessment procedures 15 2.1 General 15 2.1.1 Zero defect approach 15 2.1.2 100 % Test 16 2.1.3 Certificate of Conformity (CoC) . 16 2.1.4 Cert
15、ified test records 16 2.1.5 Failure rate level 16 2.2 Qualification approval . 17 2.2.1 General . 17 2.2.2 Level P 17 2.2.3 Level R 17 2.3 Quality conformance inspection 17 2.3.1 General . 17 2.3.2 Qualification approval according to QC 001002-3:2005, Clause 3 . 17 2.3.3 Technology approval accordin
16、g to QC 001002-3:2005, Clause 6 17 2.3.4 Non-conforming items 18 BS EN 140402:2015 EN 140402:2015Annex A (normative) Fixed sample size Qualification Approval and Quality Conformance Inspection test schedule for fixed low power wire wound SMD resistors 19 Annex B (informative) Letter symbols and abbr
17、eviations . 29 B.1 Letter symbols 29 B.2 Abbreviations . 30 Annex C (normative) Normative references 31 Bibliography . 32 BS EN 140402:2015 EN 140402:2015Foreword This document (EN 140402:2015) has been prepared by CLC/TC 40XB, “Resistors“. The following dates are fixed: latest date by which this do
18、cument has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-12-15 latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2017-12-15 This document supersedes EN 140402:1998. EN 140402:2015
19、includes the following significant technical changes with respect to EN 140402:1998: introduction of a test on the resistance to electrostatic discharge (ESD) in 1.7 and Annex A; introduction of code letters for the temperature coefficient (TCR) as in EN 60062:2005; revision of ordering information
20、in 1.10.4; adoption of the IECQ rules of procedure according to QC 001002-3:2005; revision of the sample quantities and the sequence of tests in Annex A; editorial revision. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC
21、and/or CEN shall not be held responsible for identifying any or all such patent rights. This specification supports the building of a series of documents describing fixed low power wire wound surface mount (SMD) resistors as follows: EN 60115-1, Fixed resistors for use in electronic equipment Part 1
22、: Generic specification (IEC 60115-1, modified) EN 60115-8, Fixed resistors for use in electronic equipment Part 8: Sectional specification Fixed surface mount resistors (IEC 60115-8, modified) EN 140402-8xx, Detail specification: Fixed low power wirewound surface mount (SMD) resistors . Any detail
23、specification within this series is written on the basis of this blank detail specification. _ BS EN 140402:2015 EN 140402:2015Introduction Blank detail specification A blank detail specification is a supplementary document to the sectional specification and contains requirements for style and layou
24、t and minimum content of detail specifications. Detail specifications not complying with these requirements should not be considered as being in accordance with European Standards nor should they be so described. In the preparation of the detail specification the content of EN 60115-8:2012, 1.4 shou
25、ld be taken into account. The detail specification should be written by using the preferred values given in EN 60115-8. The detail specification should contain a table of contents prior the first page of the actual specification. For the use of SI units refer to EN ISO 80000-1, for the use of letter
26、 symbols to be used in electrical technology, refer to EN 60027-1. This Blank Detail Specification uses two different kinds of notes: NOTE for notes which give additional information intended to assist the understanding or use of the resulting document and therefore should be copied as NOTE into the
27、 drafted Detail Specification. NOTE (ed) for editorial notes which are intended to aid and direct the specification writer and therefore should not be copied into the drafted Detail Specification. Identification of the detail specification and the component The first page of the detail specification
28、 should have the layout recommended on page 6. The numbers in square brackets correspond to the indications to be completed thereunder: 1 the name of the Standardisation Organisation under whose authority the detail specification is published and if applicable, the organisation from whom the detail
29、specification is available; 2 the CECC symbol and the number allocated to the detail specification by the CENELEC General Secretariat; 3 the number and issue number of the EN generic and sectional specification as relevant; also national reference if different; 4 the national number of the detail sp
30、ecification, date of issue and any further information required by the national system, together with any amendment numbers, if different from the EN number; 5 a brief description of the component or range of components; 6 information on typical construction (where applicable); 7 an outline drawing
31、with the main dimensions which are of importance for interchangeability and/or reference to the appropriate national or international document for outlines. Alternatively, this drawing may be given in an annex to the detail specification; 8 the level of quality assessment covered by the detail speci
32、fication. For 5 and 6 the text to be given in the detail specification should be suitable for an entry in a register of approvals and the “CENELEC Catalogue of European Standards”. BS EN 140402:2015 EN 140402:2015Specification available from: 1 EN 140402- . . . (Specification number) 2 Electronic co
33、mponents of assessed quality in accordance with: 3 EN 60115-1:2011 EN 60115-8:2012 EN 140402:2015 Issue . . . 4 April 2015 7 Other shapes are permitted within the given dimensions. Figure 1 Outline and dimensions (see Table 1) Fixed low power wire wound 5 resistors 6 (Description of the component) A
34、ssessment level EZ a8Level P: with 100 %-test Level R: with failure rate level and 100 %-test Stability classes . . . aSee 2.1.1 for an explanation on the assessment level EZ. NOTE 1 (ed) Level R is optional. NOTE 2 (ed) The title block shown above is not part of the specifications foreword or intro
35、duction and therefore needs to appear on top of a new page. The remainder of that page is intentionally left empty in order to start Clause 1 on top of the next page. BS EN 140402:2015 EN 140402:20151 Characteristics and ratings 1.1 General Various parameters of this component are precisely defined
36、in this specification. Unspecified parameters may vary from one component to another. 1.2 Dimensions and ratings The shape and dimensions of the resistors covered by this specification are shown in Figure 1, with the specific styles and their respective dimensions given in Table 1. Other shapes are
37、permissible within the given dimensions. Table 1 Style and dimensions Style aLength L mm Width W mm mm mm mm Mass amg metric Xamin. max. min. max. min. max. min. max. min. max. max. aFor information only. NOTE 1 (ed) Column X is optional for additional information (e.g. size code), which is for info
38、rmation only. NOTE 2 (ed) See EN 60115-8:2012, 1.4.2. NOTE 3 Information about manufacturers who have components qualified to this detail specification is available in the approvals section of the website http:/www.iecq.org. Table 2 Ratings StyleRated dissipationX Limiting element voltage d.c. or a.
39、c. (r.m.s.)Insulation voltage d.c. or a.c. (peak) P70W UmaxV UinsV 1 mincontinuousNOTE 4 (ed) Column X is an optional column for additional information, e.g. an additional maximum dissipation at another ambient temperature than 70 C, hence e.g. at 25 C or at 40 C. NOTE 5 (ed) See EN 60115-8:2012, 1.
40、4.8, 1.4.9 and 1.4.10. Should it be necessary to control further parameters, a more detailed specification should be used. Then the additional test method(s) shall be fully described and appropriate limits and inspection levels (IL) shall be specified. BS EN 140402:2015 EN 140402:20151.3 Derating cu
41、rve The permissible dissipation of resistors covered by this detail specification is the rated dissipation as given in Table 2, which is derated for an ambient temperature above the rated temperature 70 C according to the diagram in Figure 2. NOTE 1 (ed) See EN 60115-8:2012, 1.4.8. NOTE 2 (ed) A lar
42、ger area of operation may be given in the detail specification, provided it includes all the area given above. In such case the following paragraph applies. The manufacturer of the resistors covered by this detail specification may uprate the products by specification of an increased dissipation up
43、to the maximum dissipation given in Table 2, which is derated for an ambient temperature above the reference temperature of according to the diagram in Figure 2. The manufacturer shall support such uprating with respective test results. Key X ambient temperature amb Y fraction of the rated dissipati
44、on P70Figure 2 Derating curve NOTE 3 Climatic tests and the assessment of the temperature coefficient of resistance apply the upper category temperature, UCT, as the highest temperature, whereas the loads applied under endurance testing aim to subject the resistive element to the maximum element tem
45、perature, MET. NOTE 4 (ed) The following paragraph applies if the maximum element temperature is specified above 155 C The use of the full specified dissipation and temperature range results in a high temperature on the substrate (PCB) and in the solder joints. It may hence be required to select sui
46、table substrate material and suitable solder material in order to maintain the reliability of the assembly. 1.4 Resistance range and tolerance on rated resistance 1.4.1 Level P NOTE 1 Product classification to Level P adopts and succeeds the former Version A as used in prior revisions of this detail
47、 specification. BS EN 140402:2015 EN 140402:2015Table 3 gives the combinations of temperature coefficient, tolerance on resistance and resistance range which may be approved to Level P according to this detail specification. The respective E Series are specified as a recommendation only for Level P.
48、 Products from the extent given in Table 3 shall be used for the initial product qualification approval to Level P according to 2.2.2, and for the quality conformance inspection according to 2.3. The qualification of resistances below or above the specified resistance ranges is permissible if they f
49、ulfil the requirements of the stability class prescribed for the closest resistance within a specified range; e.g. resistors of Style RW0704M, 1 %, 2,43 k shall fulfil the requirements of stability class 1. Table 3 Resistance range and tolerance on rated resistance for Level P Style Tolerance on rated resistance Temperature coefficient Resistance range Stability class E Series b% Code a10-6/K Code aaCode letters according to EN 60062. bE Series according to
