1、BRITISH STANDARDBS EN62319-1:2005Polymeric thermistors Directly heated positive step function temperature coefficient Part 1: Generic specificationICS 31.040.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44
2、g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Incorporating March 2009 corrigendumNational forewordThis British Standard is the UK implementation of EN 62319-1:2005. It is identical with IEC 62319-1:2005, incorporating corrigendum The start and finish of text introduced or altered by c
3、orrigendum is indicated in the text by tags. Text altered by IEC corrigendum March 2009 is indicated in the text by .The UK participation in its preparation was entrusted by Technical Committee EPL/40X, Capacitors and resistors for electronic equipment.A list of organizations represented on this com
4、mittee 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 obligations.BS EN 62319-1:2005This Britis
5、h Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2000 BSI 2009Amendments/corrigenda issued since publicationDate Comments 31 December 2009 Implementation of IEC corrigendum March 2009ISBN 978 0 580 67556 0March 2009. EUROPEAN STANDARD EN 62319-1
6、NORME EUROPENNE EUROPISCHE NORM March 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploita
7、tion in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62319-1:2005 E ICS 31.040.30 English version Polymeric thermistors - Directly heated positive step function temperature coefficient Part 1: Generic specification (IEC 62319-1:2005) Thermistances polymres - Coeffici
8、ent de temprature positif de fonction chelon chauffage direct Partie 1: Spcification gnrique (CEI 62319-1:2005) Temperaturabhngige Widerstnde aus Polymerwerkstoffen - Direkt geheizte temperaturabhngige Widerstnde mit positivem Temperaturkoeffizienten Teil 1: Fachgrundspezifikation (IEC 62319-1:2005)
9、 This European Standard was approved by CENELEC on 2005-02-01. 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
10、 references concerning such 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 CEN
11、ELEC member into its own 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Irel
12、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 40/1505/FDIS, future edition 1 of IEC 62319-1, prepared by IEC TC 40, Capacitors and resistors for electronic equi
13、pment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62319-1 on 2005-02-01. 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) 2005-12-01 lates
14、t date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-02-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 62319-1:2005 was approved by CENELEC as a European Standard without any modification. _ 2 EN 62319-
15、1:2005BS EN 62319-1:2005CONTENTS 1 General5 1.1 Scope5 1.2 Normative references 5 2 Technical data6 2.1 Units and symbols .6 2.2 Terms and definitions6 2.3 Preferred values 9 2.4 Marking .10 3 Quality assessment procedures 10 3.1 General .10 3.2 Primary stage of manufacture 10 3.3 Subcontracting 11
16、3.4 Structurally similar components .11 3.5 Qualification approval procedures 11 3.6 Rework and repair .17 3.7 Release for delivery.17 3.8 Certified test records of released lots.18 3.9 Delayed delivery18 3.10 Alternative test methods 18 3.11 Manufacture outside the geographical limits of IECQ NSIs1
17、8 3.12 Unchecked parameters 18 4 Test and measurement procedures .18 4.1 Standard conditions for testing.18 4.2 Drying and recovery.19 4.3 Visual inspection and check of dimensions.19 4.4 Zero power resistance .20 4.5 Insulation resistance (for insulated types only) .20 4.6 Voltage proof (for insula
18、ted types only) 21 4.7 Robustness of terminations (for leaded types only).21 4.8 Soldering.22 4.9 Mounting .22 4.10 Rapid change of temperature.23 4.11 Climatic sequence .23 4.12 Cycle life testing24 4.13 Trip endurance 26 4.14 Trip current .27 4.15 Hold current 27 4.16 Residual current and power di
19、ssipation 28 4.17 Time-to-trip .28 4.18 Cold environmental electrical cycling29 4.19 Thermal runaway.29 3 EN 62319-1:2005BS EN 62319-1:2005Annex A (normative) Fixed sample size test schedules for qualification approval.30 Annex B (normative) Vibration-, bump-, shock-, shear-, substrate bending test3
20、1 B.1 Vibration 31 B.2 Bump .31 B.3 Shock.32 B.4 Shear (adhesion) test .32 B.5 Substrate bending test32 Figure 1 Test schedule flow chart.14 Figure 2 Circuit for Trip endurance .27 Table 1 Fixed sample size test schedule for qualification approval of Polymeric PTC thermistors for current limitation,
21、 assessment level EZ.15 Table 2 Quality conformance inspection for lot-by-lot inspection16 Table 3 Quality conformance inspection for periodic testing 17 Table 4 Loading weight for wire terminations 21Table 5 Number of cycles.24 4 Annex ZA (normative) Normative references to international publicatio
22、ns with their corresponding European publications. 33 EN 62319-1:2005BS EN 62319-1:2005POLYMERIC THERMISTORS DIRECTLY 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 posi
23、tive temperature coefficient thermistors, insulated and non-insulated types, typically intended for use in current limiting and overcurrent protection applications. It establishes standard terms, inspection procedures and methods of test for use in detail specifications for Qualification Approval an
24、d for Quality Assessment Systems for electronic components. 1.2 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
25、(including any amendments) applies. IEC 60027-1: Letter symbols to be used in electrical technology Part 1: General 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: Vibrati
26、on (sinusoidal) IEC 60068-2-14: Environmental testing Part 2: Tests Test N: Change of temperature IEC 60068-2-20: 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、27: Environmental testing Part 2: Tests Test Ea and guidance: Shock IEC 60068-2-29: Environmental testing Part 2: 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 cy
28、lindrical component having two axial terminations IEC 60410: Sampling plans and procedures for inspection by attributes. 5 EN 62319-1:2005BS EN 62319-1:2005IEC 60617-DB: 20011Graphical symbols for diagrams IECQ 001003: IEC Quality Assessment System for Electronic Components Guidance documents IECQ 0
29、01002-3: IEC Quality Assessment System for Electronic Components Rules of Procedure Part 3: Approval procedures ISO 1000: SI 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 termino
30、logy shall, whenever possible, be taken from the following documents: IEC 60027 IEC 60050 IEC 60617 ISO 1000 The following subclauses contain additional terminology applicable to thermistors. Where further items are required they shall be derived in accordance with the principles of the documents li
31、sted above. 2.2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.2.1 thermistor 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 p
32、ositive temperature coefficient thermistor thermistor in which the resistance increases with increasing temperature throughout 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 rang
33、e 2.2.3 directly heated positive temperature coefficient thermistor thermistor in which the change in temperature is obtained 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 IE
34、C on-line database. 6 EN 62319-1:2005BS EN 62319-1:20052.2.4 zero power resistance RTvalue of the resistance of a PTC thermistor, at a given 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 measur
35、ement 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 nominal zero power resistance Rnzero power resistance used as a reference value for which the following conditions should be given in the detail specification: a) refer
36、ence temperature, preferably 25 C b) applied voltage (DC or AC) 2.2.6 resistance/temperature characteristics relationship between the zero power resistance of a thermistor and the temperature of the thermosensitive element when measured under specified reference conditions 2.2.7 upper category tempe
37、rature UCT maximum ambient operating temperature of the thermistor 2.2.8 lower category temperature LCT minimum ambient operating temperature 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 resistanc
38、e Rminminimum resistance of the thermistor 2.2.11 maximum initial resistance Rmaxmaximum resistance of the thermistor before its initial trip event 2.2.12 maximum resistance 1 h after tripping R1maxfor leaded thermistors the maximum resistance of the thermistor 1 h after its first trip event; for su
39、rface mount thermistors, the maximum resistance of the thermistor 1 h after reflow 2.2.13 maximum voltage Umaxmaximum AC or DC voltage which may be applied to the thermistor 7 EN 62319-1:2005BS EN 62319-1:20052.2.14 operating temperature range at maximum voltage range of ambient temperatures at whic
40、h the thermistor can operate at the maximum voltage 2.2.15 isolation voltage (applicable only to insulated thermistors) maximum peak voltage which may be applied under continuous operating conditions between any of the thermistor terminations and any conducting surface 2.2.16 maximum current Imaxval
41、ue of current for the operating temperature range, which should not be exceeded 2.2.17 residual current Iresvalue of current in the tripped thermistor at a specified ambient temperature (preferably 25 C) under steady state conditions; the applied voltage is the maximum voltage unless otherwise speci
42、fied 2.2.18 trip current Itlowest current which will cause the thermistor to trip to its high resistance state at a specified temperature (preferably 25 C) and within a time specified in the detail specification 2.2.19 hold current Ihthe maximum current at specified ambient temperature, preferably 2
43、5 C, which will not cause the trip event 2.2.20 fault current Ifaultcurrent used when measuring time to trip 2.2.21 power dissipation Pdproduct of the current flowing through a device and the voltage across it, under steady state conditions; the applied voltage is the maximum voltage unless otherwis
44、e specified 2.2.22 time-to-trip ttripunder specified ambient conditions, starting from the time the fault current (Ifault) is applied, the time-to-trip is the time required for a device to switch into the tripped state 2.2.23 insulated thermistors thermistors capable of meeting the requirements of t
45、he insulation resistance and voltage proof tests when specified in the test schedule 8 EN 62319-1:2005BS EN 62319-1:20052.3 Preferred values 2.3.1 Climatic categories The thermistors covered by this specification are classified into climatic categories according to the general rules given in the ann
46、ex to IEC 60068-1. The detail specification prescribes the appropriate category. 2.3.2 Void2.3.3 Shock test severities Test severities given in detail specifications shall preferably be the following: Test Ea (IEC 60068-2-27) Pulse shape: Half sine Acceleration: 500 m/s2Pulse duration: 11 ms. Severi
47、ty: 3 successive shocks in each axis direction per specimen. Separate specimens to be used for each axis (6 shocks total per specimen). NOTE The shock and bump tests are normally specified as alternatives. 2.3.4 Vibration severities Test severities given in the detail specifications shall preferably
48、 be selected from the following: Test Fc (IEC 60068-2-6) Frequency range: 10 Hz to 55 Hz or 10 Hz to 500 Hz Amplitude: 0,75 mm or 100 m/s2(whichever is the less severe) Sweep endurance: Total duration 6 h. Thermistors shall be mounted by their normal means, in such a manner that there shall be no pa
49、rasitic vibration. During vibration testing there shall be no interruption in electrical continuity greater than 0,5 ms. 9 EN 62319-1:2005 BS EN 62319-1:20052.4 Marking 2.4.1 General The following shall be clearly marked on the thermistor in the following order of precedence as space permits: a) values of the primary characteristics appropriate to the application of the thermistor to be specified in the detail specification. When these valu
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