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

IEC 60539-1:2016 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. IEC 60539 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 third edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision. Tables, figures and references have been revised.
The contents of the corrigendum of September 2017 have been included in this copy.

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

L'IEC 60539-1:2016 s'applique aux thermistances à coefficient de température négatif à chauffage direct, typiquement constituées de matériaux faits d'oxyde de métal de transition présentant des propriétés semi-conductrices. Elle établit des définitions, des procédures de contrôle et des méthodes d'essai normalisées à utiliser dans les spécifications intermédiaires et particulières des composants électroniques, pour les systèmes d'assurance de la qualité ou pour tout autre usage. Cette troisième édition annule et remplace la deuxième édition parue en 2008. Cette édition constitue une révision technique. Les tableaux, figures et références ont été révisés.
Le contenu du corrigendum de septembre 2017 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
26-Apr-2016
Current Stage
PPUB - Publication issued
Start Date
27-Apr-2016
Completion Date
27-Apr-2016
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IEC 60539-1
Edition 3.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Directly heated negative temperature coefficient thermistors –
Part 1: Generic specification
Thermistances à coefficient de température négatif à chauffage direct –
Partie 1: Spécification générique
IEC 60539-1:2016-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60539-1
Edition 3.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Directly heated negative temperature coefficient thermistors –
Part 1: Generic specification
Thermistances à coefficient de température négatif à chauffage direct –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.040.30 ISBN 978-2-8322-3307-8

Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60539-1:2016  IEC 2016
CONTENTS

FOREWORD ........................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 10

4 General items ................................................................................................................ 20

4.1 Units and symbols................................................................................................. 20

4.2 Preferred values and appropriate category ............................................................ 20

4.2.1 General ......................................................................................................... 20

4.2.2 Appropriate category ..................................................................................... 20

4.3 Marking ................................................................................................................. 20

4.3.1 General ......................................................................................................... 20

4.3.2 Marking for small size types such as surface mount thermistors .................... 21

4.3.3 Coding ........................................................................................................... 21

4.4 Quality assessment procedures ............................................................................ 21

5 Test and measurement procedures ................................................................................ 21

5.1 General ................................................................................................................. 21

5.2 Standard atmospheric conditions for testing .......................................................... 21

5.3 Drying and recovery .............................................................................................. 22

5.3.1 Drying ............................................................................................................ 22

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

5.4 Mounting (for surface mount thermistors only) ...................................................... 22

5.4.1 General ......................................................................................................... 22

5.4.2 Substrate and pad ......................................................................................... 22

5.4.3 Mounting on board ......................................................................................... 22

5.5 Visual examination and check of dimensions ........................................................ 23

5.5.1 Visual examination ........................................................................................ 23

5.5.2 Dimensions .................................................................................................... 24

5.6 Zero-power resistance .......................................................................................... 24

5.6.1 General ......................................................................................................... 24

5.6.2 Measurement procedures .............................................................................. 24

5.6.3 Requirements ................................................................................................ 24

5.7 B-value or resistance ratio .................................................................................... 25

5.7.1 General ......................................................................................................... 25

5.7.2 Requirements ................................................................................................ 25

5.8 Insulation resistance (for insulated types only) ...................................................... 25

5.8.1 General ......................................................................................................... 25

5.8.2 Test methods ................................................................................................. 25

5.8.3 Applied voltage .............................................................................................. 27

5.8.4 Requirements ................................................................................................ 28

5.9 Voltage proof (for insulated types only) ................................................................. 28

5.9.1 General ......................................................................................................... 28

5.9.2 Test voltage ................................................................................................... 28

5.9.3 Requirements ................................................................................................ 28

5.10 Resistance/temperature characteristic .................................................................. 28

5.10.1 General ......................................................................................................... 28

5.10.2 Test methods ................................................................................................. 28

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IEC 60539-1:2016  IEC 2016 – 3 –

5.10.3 Requirements ................................................................................................ 28

5.11 Dissipation factor (δ) ............................................................................................. 28

5.11.1 General ......................................................................................................... 28

5.11.2 Initial measurements ..................................................................................... 29

5.11.3 Test methods ................................................................................................. 29

5.11.4 Requirements ................................................................................................ 30

5.12 Thermal time constant by ambient temperature change (τ ) ................................. 30

5.12.1 The hot to cold thermal time constant for ambient temperature change .......... 30

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

5.12.3 Final measurements and requirements .......................................................... 31

5.12.4 Requirements ................................................................................................ 31

5.13 Thermal time constant by cooling after self-heating (τ ) ........................................ 31

5.13.1 General ......................................................................................................... 31

5.13.2 Initial measurements ..................................................................................... 31

5.13.3 Preconditioning .............................................................................................. 32

5.13.4 Test method .................................................................................................. 32

5.13.5 Final measurements and requirements .......................................................... 32

5.14 Robustness of terminations (not applicable to surface mount thermistors) ............ 33

5.14.1 General ......................................................................................................... 33

5.14.2 Initial measurements ..................................................................................... 33

5.14.3 Test methods ................................................................................................. 33

5.14.4 Test Ua – Tensile ........................................................................................ 33

5.14.5 Test Ub – Bending (half the number of terminations) ..................................... 33

5.14.6 Test Uc – Torsion (remaining terminations).................................................... 33

5.14.7 Final measurements and requirements .......................................................... 34

5.15 Resistance to soldering heat ................................................................................. 34

5.15.1 General ......................................................................................................... 34

5.15.2 Preconditioning .............................................................................................. 34

5.15.3 Test procedure .............................................................................................. 34

5.15.4 Recovery ....................................................................................................... 34

5.15.5 Final inspection, measurement and requirements .......................................... 34

5.16 Solderability .......................................................................................................... 35

5.16.1 General ......................................................................................................... 35

5.16.2 Test procedure .............................................................................................. 35

5.16.3 Final inspection, measurements and requirements......................................... 35

5.17 Rapid change of temperature ................................................................................ 35

5.17.1 General ......................................................................................................... 35

5.17.2 Initial measurements ..................................................................................... 35

5.17.3 Test procedures ............................................................................................. 35

5.17.4 Final inspection, measurements and requirements......................................... 36

5.18 Vibration ............................................................................................................... 36

5.18.1 General ......................................................................................................... 36

5.18.2 Initial measurements ..................................................................................... 36

5.18.3 Test procedures ............................................................................................. 36

5.18.4 Final inspection, measurements and requirements......................................... 36

5.19 Shock ................................................................................................................... 37

5.19.1 General ......................................................................................................... 37

5.19.2 Initial measurements ..................................................................................... 37

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– 4 – IEC 60539-1:2016  IEC 2016

5.19.3 Mounting ....................................................................................................... 37

5.19.4 Test procedures ............................................................................................. 37

5.19.5 Final inspection, measurements and requirements......................................... 37

5.20 Free fall ................................................................................................................ 37

5.20.1 General ......................................................................................................... 37

5.20.2 Initial measurements ..................................................................................... 37

5.20.3 Test procedures ............................................................................................. 37

5.20.4 Final inspection, measurements and requirements......................................... 37

5.21 Thermal shock ...................................................................................................... 37

5.21.1 General ......................................................................................................... 37

5.21.2 Initial measurements ..................................................................................... 38

5.21.3 Test procedures ............................................................................................. 38

5.21.4 Final inspection, measurements and requirements......................................... 38

5.22 Cold ...................................................................................................................... 38

5.22.1 General ......................................................................................................... 38

5.22.2 Initial measurements ..................................................................................... 38

5.22.3 Test procedures ............................................................................................. 38

5.22.4 Final inspection, measurements and requirements......................................... 39

5.23 Dry heat ................................................................................................................ 39

5.23.1 General ......................................................................................................... 39

5.23.2 Initial measurements ..................................................................................... 39

5.23.3 Test procedures ............................................................................................. 39

5.23.4 Final inspection, measurements and requirements......................................... 39

5.24 Damp heat, steady state ....................................................................................... 39

5.24.1 General ......................................................................................................... 39

5.24.2 Initial measurements ..................................................................................... 40

5.24.3 Test procedures ............................................................................................. 40

5.24.4 Recovery ....................................................................................................... 40

5.24.5 Final inspection, measurements and requirements......................................... 40

5.25 Endurance ............................................................................................................ 40

5.25.1 General ......................................................................................................... 40

5.25.2 Endurance at room temperature with applied continuous maximum

current (I ) (for inrush current-limiting thermistors only) ........................ 40

max25
5.25.3 Endurance at room temperature with applied cyclic maximum current

(I ) (for inrush current-limiting thermistors only) .................................... 41

max25

5.25.4 Endurance at T and P ............................................................................ 42

3 max

5.25.5 Endurance at upper category temperature ..................................................... 43

5.25.6 Maximum permissible capacitance (for inrush current-limiting

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

5.26 Shear (adhesion) test (for surface mount thermistors only) ................................... 45

5.26.1 General ......................................................................................................... 45

5.26.2 Test conditions .............................................................................................. 46

5.26.3 Requirements ................................................................................................ 46

5.27 Substrate bending test (for surface mount thermistors only) .................................. 46

5.27.1 General ......................................................................................................... 46

5.27.2 Initial measurements ..................................................................................... 46

5.27.3 Test procedures ............................................................................................. 46

5.27.4 Final inspection and requirements ................................................................. 46

5.28 Component solvent resistance .............................................................................. 46

5.28.1 General ......................................................................................................... 46

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IEC 60539-1:2016  IEC 2016 – 5 –

5.28.2 Initial measurements ..................................................................................... 47

5.28.3 Test conditions .............................................................................................. 47

5.28.4 Requirements ................................................................................................ 47

5.29 Solvent resistance of marking ............................................................................... 47

5.29.1 General ......................................................................................................... 47

5.29.2 Test conditions .............................................................................................. 47

5.29.3 Requirements ................................................................................................ 47

5.30 Salt mist ............................................................................................................... 47

5.30.1 General ......................................................................................................... 47

5.30.2 Test conditions .............................................................................................. 47

5.31 Sealing ................................................................................................................. 47

5.32 Composite temperature/humidity cycle .................................................................. 48

5.32.1 General ......................................................................................................... 48

5.32.2 Initial measurements ..................................................................................... 48

5.32.3 Test conditions .............................................................................................. 48

5.32.4 Final inspection, measurements and requirements......................................... 48

Annex A (normative) Interpretation of sampling plans and procedures as described in

IEC 60410:1973 for use within quality assessment systems .................................................. 49

A.1 Clause and subclause numbers of IEC 60410:1973 .............................................. 49

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

heated thermistors for electronic equipment for use within quality assessment systems ....... 50

B.1 Drafting ................................................................................................................. 50

B.2 Reference standard .............................................................................................. 50

B.3 Circulation ............................................................................................................ 50

Annex C (informative) Typical examples of mountings for measurements of directly

heated thermistors ................................................................................................................ 51

C.1 Mounting for surface mount thermistors ................................................................ 51

Annex D (informative) Reference to IEC 60539-1:2008 ........................................................ 53

Annex Q (normative) Quality assessment procedures .......................................................... 54

Q.1 General ................................................................................................................. 54

Q.2 Primary stage of manufacture ............................................................................... 54

Q.3 Structurally similar components ............................................................................ 54

Q.4 Qualification approval procedures ......................................................................... 55

Q.4.1 General ......................................................................................................... 55

Q.4.2 Test procedure for qualification approval ....................................................... 55

Q.4.3 Maintenance of qualification approval ............................................................ 55

Q.5 Quality conformance inspection ............................................................................ 56

Q.6 Certified test records of released lots .................................................................... 56

Q.7 Delayed delivery ................................................................................................... 56

Q.8 Release for delivery under qualification approval before the completion of

group B tests ........................................................................................................ 56

Q.9 Alternative test methods ....................................................................................... 56

Q.10 Unchecked parameters ......................................................................................... 56

Bibliography .......................................................................................................................... 57

Figure 1 – Typical resistance-temperature characteristic for NTC thermistors ....................... 13

Figure 2 – Decreased power dissipation curve ...................................................................... 15

Figure 3 – Maximum current derating .................................................................................... 17

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– 6 – IEC 60539-1:2016  IEC 2016

Figure 4 – Basic circuit for zero-power resistance measurement ........................................... 24

Figure 5 – Example of Method 1 for testing the insulation resistance .................................... 25

Figure 6 – Example of Method 2 for testing the insulation resistance (1) ............................... 26

Figure 7 – Example of Method 2 for testing the insulation resistance (2) ............................... 26

Figure 8 – Example of Method 3 for testing the i
...

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