Directly heated negative temperature coefficient thermistors - Part 1: Generic specification

IEC 60539-1:2022 is applicable to directly heated negative temperature coefficient thermistors, typically made from transition metal oxide materials with semiconducting properties. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. This edition includes the following significant technical changes with respect to the previous edition:  Restructured completely to comply to ISO/IEC directives; categorization and reorganization of test methods into these categories; Annex X added for comparison to the previous edition; Some wordings, figures and references have been revised.

Direkt geheizte temperaturabhängige Widerstände mit negativem Temperaturkoeffizienten - Teil 1: Fachgrundspezifikation

Thermistances à coefficient de température négatif à chauffage direct - Partie 1: Spécification générique

L’IEC 60539-1:2022 s’applique aux thermistances à coefficient de température négatif à chauffage direct, généralement constituées d’oxydes de métaux de transition présentant des propriétés semi-conductrices. Elle établit des termes, des procédures d’inspection et des méthodes d’essai normaux à utiliser dans les spécifications intermédiaires et particulières des composants électroniques, pour l’assurance de la qualité ou pour tout autre usage. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:  cette édition a été entièrement remaniée conformément aux Directives ISO/IEC; différentes catégories ont été définies et les méthodes d’essai ont été réorganisées en fonction de ces catégories; l’Annexe X a été ajoutée à titre de comparaison par rapport à l’édition précédente; certaines formulations, figures et références ont été révisées.

Neposredno ogrevani termistorji z negativnim temperaturnim koeficientom - 1. del: Splošna specifikacija

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Publication Date
02-Feb-2023
Current Stage
6060 - Document made available - Publishing
Start Date
03-Feb-2023
Completion Date
03-Feb-2023

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SLOVENSKI STANDARD
oSIST prEN IEC 60539-1:2022
01-februar-2022

Neposredno ogrevani termistorji z negativnim temperaturnim koeficientom - 1. del:

Splošna specifikacija
Directly heated negative temperature coefficient thermistors - Part 1: Generic
specification
Direkt geheizte temperaturabhängige Widerstände mit negativem
Temperaturkoeffizienten - Teil 1: Fachgrundspezifikation

Thermistances à coefficient de température négatif à chauffage direct - Partie 1:

Spécification générique
Ta slovenski standard je istoveten z: prEN IEC 60539-1:2021
ICS:
31.040.30 Termistorji Thermistors
oSIST prEN IEC 60539-1:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 60539-1:2022
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oSIST prEN IEC 60539-1:2022
40/2892/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60539-1 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-11-26 2022-02-18
SUPERSEDES DOCUMENTS:
40/2833/CD, 40/2874/CC
IEC TC 40 : CAPACITORS AND RESISTORS FOR ELECTRONIC EQUIPMENT
SECRETARIAT: SECRETARY:
Netherlands Mr Ronald Drenthen
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which

they are aware and to provide supporting documentation.
TITLE:

Directly heated negative temperature coefficient thermistors - Part 1: Generic specification

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:

Copyright © 2021 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without

permission in writing from IEC.
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1 CONTENTS

3 FOREWORD ........................................................................................................................... 8

4 1 Scope ............................................................................................................................ 10

5 2 Normative references .................................................................................................... 10

6 3 Terms and definitions .................................................................................................... 11

7 4 General items ................................................................................................................ 21

8 4.1 Units and symbols ................................................................................................ 21

9 4.2 Preferred values and appropriate category ............................................................ 21

10 4.2.1 General ......................................................................................................... 21

11 4.2.2 Appropriate category ..................................................................................... 21

12 4.3 Marking ................................................................................................................. 21

13 4.3.1 General ......................................................................................................... 21

14 4.3.2 Marking for small size types such as surface mount NTC thermistors ............ 22

15 4.3.3 Coding ........................................................................................................... 22

16 4.4 Quality assessment procedures ............................................................................ 22

17 5 General provisions for measurements and test methods ................................................ 22

18 5.1 General ................................................................................................................. 22

19 5.2 Standard atmospheric conditions for testing .......................................................... 22

20 5.3 Drying and recovery .............................................................................................. 23

21 5.3.1 Drying ............................................................................................................ 23

22 5.3.2 Recovery ....................................................................................................... 23

23 5.4 Mounting (for surface mount thermistors only) ...................................................... 23

24 5.4.1 General ......................................................................................................... 23

25 5.4.2 Printed wiring board and land pattern ............................................................ 23

26 5.4.3 Mounting on board ......................................................................................... 23

27 6 Electrical tests and measurements ................................................................................ 25

28 6.1 Zero-power resistance .......................................................................................... 25

29 6.1.1 General ......................................................................................................... 25

30 6.1.2 Measurement procedures .............................................................................. 25

31 6.1.3 Requirements ................................................................................................ 25

32 6.2 B-value or resistance ratio .................................................................................... 25

33 6.2.1 General ......................................................................................................... 25

34 6.2.2 Requirements ................................................................................................ 25

35 6.3 Insulation resistance (for insulated types only) ...................................................... 26

36 6.3.1 General ......................................................................................................... 26

37 6.3.2 Test methods ................................................................................................. 26

38 6.3.3 Applied voltage .............................................................................................. 28

39 6.3.4 Requirements ................................................................................................ 29

40 6.4 Voltage proof (for insulated types only) ................................................................. 29

41 6.4.1 General ......................................................................................................... 29

42 6.4.2 Test voltage ................................................................................................... 29

43 6.4.3 Requirements ................................................................................................ 29

44 6.5 Resistance/temperature characteristic .................................................................. 29

45 6.5.1 General ......................................................................................................... 29

46 6.5.2 Test methods ................................................................................................. 29

47 6.5.3 Requirements ................................................................................................ 29

48 6.6 Dissipation factor (δ) ............................................................................................. 29

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49 6.6.1 General ......................................................................................................... 29

50 6.6.2 Initial measurements ..................................................................................... 29

51 6.6.3 Test methods ................................................................................................. 30

52 6.6.4 Requirements ................................................................................................ 31

53 6.7 Thermal time constant by ambient temperature change (τ ) ................................. 31

54 6.7.1 The hot to cold thermal time constant for ambient temperature change .......... 31

55 6.7.2 The cold to hot thermal time constant for ambient temperature change .......... 32

56 6.7.3 Final measurements and requirements .......................................................... 32

57 6.7.4 Requirements ................................................................................................ 32

58 6.8 Thermal time constant by cooling after self-heating (τ ) ........................................ 33

59 6.8.1 General ......................................................................................................... 33

60 6.8.2 Initial measurements ..................................................................................... 33

61 6.8.3 Preconditioning .............................................................................................. 33

62 6.8.4 Test method .................................................................................................. 34

63 6.8.5 Final measurements and requirements .......................................................... 34

64 7 Mechanical test and measurements ............................................................................... 34

65 7.1 Visual examination and check of dimensions ........................................................ 34

66 7.1.1 Visual examination ........................................................................................ 34

67 7.1.2 Dimensions .................................................................................................... 34

68 7.2 Robustness of terminations (not applicable to surface mount thermistors) ............ 34

69 7.2.1 General ......................................................................................................... 34

70 7.2.2 Initial measurements ..................................................................................... 34

71 7.2.3 Test methods ................................................................................................. 35

72 7.2.4 Test Ua – Tensile ........................................................................................ 35

73 7.2.5 Test Ub – Bending (half the number of terminations) ..................................... 35

74 7.2.6 Test Uc – Torsion (remaining terminations) ................................................... 35

75 7.2.7 Final measurements and requirements .......................................................... 35

76 7.3 Vibration ............................................................................................................... 35

77 7.3.1 General ......................................................................................................... 35

78 7.3.2 Initial measurements ..................................................................................... 36

79 7.3.3 Test procedures............................................................................................. 36

80 7.3.4 Final inspection, measurements and requirements ........................................ 36

81 7.4 Shock ................................................................................................................... 36

82 7.4.1 General ......................................................................................................... 36

83 7.4.2 Initial measurements ..................................................................................... 36

84 7.4.3 Mounting ....................................................................................................... 36

85 7.4.4 Test procedures............................................................................................. 36

86 7.4.5 Final inspection, measurements and requirements ........................................ 36

87 7.5 Free fall ................................................................................................................ 37

88 7.5.1 General ......................................................................................................... 37

89 7.5.2 Initial measurements ..................................................................................... 37

90 7.5.3 Test procedures............................................................................................. 37

91 7.5.4 Final inspection, measurements and requirements ........................................ 37

92 7.6 Shear (adhesion) test (for surface mount NTC thermistors only) ........................... 37

93 7.6.1 General ......................................................................................................... 37

94 7.6.2 Initial measurements ..................................................................................... 37

95 7.6.3 Test conditions .............................................................................................. 37

96 7.6.4 Final inspection, measurements and requirements ........................................ 37

97 7.7 Substrate bending test (for surface mount NTC thermistors only) .......................... 37

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98 7.7.1 General ......................................................................................................... 37

99 7.7.2 Initial measurements ..................................................................................... 38

100 7.7.3 Test procedures............................................................................................. 38

101 7.7.4 Final inspection, measurements and requirements ........................................ 38

102 8 Environmental and climatic tests ................................................................................... 38

103 8.1 Rapid change of temperature ................................................................................ 38

104 8.1.1 General ......................................................................................................... 38

105 8.1.2 Initial measurements ..................................................................................... 38

106 8.1.3 Test procedures............................................................................................. 38

107 8.1.4 Final inspection, measurements and requirements ........................................ 39

108 8.2 Thermal shock ...................................................................................................... 39

109 8.2.1 General ......................................................................................................... 39

110 8.2.2 Initial measurements ..................................................................................... 39

111 8.2.3 Test procedures............................................................................................. 39

112 8.2.4 Final inspection, measurements and requirements ........................................ 39

113 8.3 Cold ...................................................................................................................... 39

114 8.3.1 General ......................................................................................................... 39

115 8.3.2 Initial measurements ..................................................................................... 39

116 8.3.3 Test procedures............................................................................................. 39

117 8.3.4 Final inspection, measurements and requirements ........................................ 40

118 8.4 Dry heat ................................................................................................................ 40

119 8.4.1 General ......................................................................................................... 40

120 8.4.2 Initial measurements ..................................................................................... 40

121 8.4.3 Test procedures............................................................................................. 40

122 8.4.4 Final inspection, measurements and requirements ........................................ 41

123 8.5 Damp heat, steady state ....................................................................................... 41

124 8.5.1 General ......................................................................................................... 41

125 8.5.2 Initial measurements ..................................................................................... 41

126 8.5.3 Test procedures............................................................................................. 41

127 8.5.4 Recovery ....................................................................................................... 41

128 8.5.5 Final inspection, measurements and requirements ........................................ 41

129 8.6 Endurance ............................................................................................................ 42

130 8.6.1 General ......................................................................................................... 42

131 8.6.2 Endurance at room temperature with applied continuous maximum

132 current (I ) (for inrush current-limiting thermistors only) ........................ 42

max25
133 8.6.3 Endurance at room temperature with applied cyclic maximum current

134 (I ) (for inrush current-limiting thermistors only) .................................... 43

max25
135 8.6.4 Endurance at T and P (for other than inrush current-limiting
3 max

136 thermistors only) ............................................................................................ 44

137 8.6.5 Endurance at upper category temperature ..................................................... 45

138 8.6.6 Maximum permissible capacitance (for inrush current-limiting

139 thermistors only) ............................................................................................ 46

140 8.7 Salt mist ............................................................................................................... 48

141 8.7.1 General ......................................................................................................... 48

142 8.7.2 Initial measurements ..................................................................................... 48

143 8.7.3 Test conditions .............................................................................................. 48

144 8.7.4 Final inspection, measurements and requirements ........................................ 48

145 8.8 Sealing ................................................................................................................. 48

146 8.9 Composite temperature/humidity cycle .................................................................. 48

147 8.9.1 General ......................................................................................................... 48

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148 8.9.2 Initial measurements ..................................................................................... 48

149 8.9.3 Test conditions .............................................................................................. 48

150 8.9.4 Final inspection, measurements and requirements ........................................ 48

151 9 Tests related to component assembly ............................................................................ 49

152 9.1 Resistance to soldering heat ................................................................................. 49

153 9.1.1 General ......................................................................................................... 49

154 9.1.2 Preconditioning .............................................................................................. 49

155 9.1.3 Initial measurements ..................................................................................... 49

156 9.1.4 Test procedure .............................................................................................. 49

157 9.1.5 Recovery ....................................................................................................... 49

158 9.1.6 Final inspection, measurement and requirements .......................................... 49

159 9.2 Solderability .......................................................................................................... 49

160 9.2.1 General ......................................................................................................... 49

161 9.2.2 Initial measurements ..................................................................................... 50

162 9.2.3 Test procedure .............................................................................................. 50

163 9.2.4 Final inspection, measurements and requirements ........................................ 50

164 9.3 Component solvent resistance .............................................................................. 50

165 9.3.1 General ......................................................................................................... 50

166 9.3.2 Initial measurements ..................................................................................... 50

167 9.3.3 Test conditions .............................................................................................. 50

168 9.3.4 Requirements ................................................................................................ 51

169 9.4 Solvent resistance of marking ............................................................................... 51

170 9.4.1 General ......................................................................................................... 51

171 9.4.2 Initial measurements ..................................................................................... 51

172 9.4.3 Test conditions .............................................................................................. 51

173 9.4.4 Requirements ................................................................................................ 51

174 Annex A (normative) Rules for the preparation of detail specifications for directly

175 heated NTC thermistors for electronic equipment for use within quality

176 assessment systems ..................................................................................................... 52

177 A.1 Drafting ................................................................................................................. 52

178 A.2 Reference standard .............................................................................................. 52

179 A.3 Circulation ............................................................................................................ 52

180 Annex B (informative) Typical examples of mountings for measurements of directly

181 heated thermistors ......................................................................................................... 53

182 B.1 Mounting for surface mount NTC thermistors ........................................................ 53

183 Annex Q (informative) Quality assessment procedures ........................................................ 55

184 Q.1 General ................................................................................................................. 55

185 Q.1.1 Scope of this annex ....................................................................................... 55

186 Q.1.2 Quality assessment definitions ...................................................................... 56

187 Q.1.3 Rework .......................................................................................................... 56

188 Q.1.4 Alternative test methods ................................................................................ 56

189 Q.1.5 Certified test records of released lots ............................................................ 57

190 Q.1.6 Unchecked parameters .................................................................................. 57

191 Q.1.7 Delayed delivery ............................................................................................ 57

192 Q.1.8 Repair ........................................................................................................... 57

193 Q.1.9 Registration of approvals ............................................................................... 57

194 Q.1.10 Manufacture outside the geographical limits .................................................. 58

195 Q.2 Qualification approval (QA) procedures ................................................................. 58

196 Q.2.1 Eligibility for qualification approval ................................................................. 58

197 Q.2.2 Application for qualification approval ............................................................. 58

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198 Q.2.3 Subcontracting .............................................................................................. 58

199 Q.2.4 Test procedure for the initial product qualification approval ........................... 58

200 Q.2.5 Granting of qualification approval .................................................................. 58

201 Q.2.6 Maintenance of qualification approval ............................................................ 58

202 Q.2.7 Quality conformance inspection ..................................................................... 58

203 Q.3 Capability approval (CA) procedures ..................................................................... 59

204 Q.3.1 General ......................................................................................................... 59

205 Q.3.2 Eligibility for capability approval ..................................................................... 59

206 Q.3.3 Application for capability approval ................................................................. 59

207 Q.3.4 Subcontracting .............................................................................................. 59

208 Q.3.5 Description of the capability ........................................................................... 59

209 Q.3.6 Demonstration and verification of capability ................................................... 60

210 Q.3.7 Granting of capability approval ...................................................................... 60

211 Q.3.8 Maintenance of capability approval ................................................................ 60

212 Q.3.9 Quality conformance inspection ..................................................................... 60

213 Q.4 Technology approval (TA) procedure .................................................................... 60

214 Q.4.1 General ......................................................................................................... 60

215 Q.4.2 Eligibility for technology approval .................................................................. 61

216 Q.4.3 Application of technology approval ................................................................ 61

217 Q.4.4 Subcontracting .............................................................................................. 61

218 Q.4.5 Description of technology .............................................................................. 61

219 Q.4.6 Demonstration and verification of the technology ........................................... 61

220 Q.4.7 Granting of technology approval .................................................................... 61

221 Q.4.8 Maintenance of technology approval .............................................................. 61

222 Q.4.9 Quality conformance inspection ..................................................................... 61

223 Q.5 Interpretation of sampling plans and procedures as described in .......................... 61

224 Q.6 Rules for the preparation of detail specifications for NTC thermistors for

225 electronic equipment for use within quality assessment systems ........................... 62

226 Q.6.1 Drafting ......................................................................................................... 62

227 Q.6.2
...

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