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eLibrary > BS EN IEC 60539-1:2023 - TC Tracked Changes. Directly heated negative temperature coefficient thermistors - Generic specification >

BS EN IEC 60539-1:2023 - TC Tracked Changes. Directly heated negative temperature coefficient thermistors - Generic specification, 2023

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BS EN IEC 60539-1:2023 - TC Tracked Changes. Directly heated negative temperature coefficient thermistors - Generic specification, 2023

30469780
A-30411012 [Go to Page]
undefined [Go to Page]
Annex A (normative)Normative references to international publicationswith their corresponding European publications
Blank Page
English [Go to Page]
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
Figures [Go to Page]
Figure 1 – Typical resistance-temperature characteristic for NTC thermistors
Figure 2 – Decreased power dissipation curve
Figure 3 – Maximum current derating
4 General items [Go to Page]
4.1 Units and symbols
4.2 Preferred values and appropriate category [Go to Page]
4.2.1 General
4.2.2 Appropriate category
4.3 Marking [Go to Page]
4.3.1 General
Tables [Go to Page]
Table 1 – Lower and upper category temperatures and duration ofthe damp heat, steady state test [Go to Page]
4.3.2 Marking for small size types such as surface mount NTC thermistors
4.3.3 Coding
4.4 Quality assessment procedures
5 General provisions for measurements and test methods [Go to Page]
5.1 General
5.2 Standard atmospheric conditions for testing
5.3 Drying and recovery [Go to Page]
5.3.1 Drying
5.3.2 Recovery
5.4 Mounting (for surface mount thermistors only) [Go to Page]
5.4.1 General
5.4.2 Printed wiring board and land pattern
5.4.3 Mounting on board
6 Electrical tests and measurements [Go to Page]
6.1 Zero-power resistance [Go to Page]
6.1.1 General
6.1.2 Measurement procedures
6.1.3 Requirements
6.2 B-value or resistance ratio [Go to Page]
6.2.1 General
6.2.2 Requirements
Figure 4 – Basic circuit for zero-power resistance measurement
6.3 Insulation resistance (for insulated types only) [Go to Page]
6.3.1 General
6.3.2 Test methods
Figure 5 – Example of Method 1 for testing the insulation resistance
Figure 6 – Example of Method 2 for testing the insulation resistance (1)
Figure 7 – Example of Method 2 for testing the insulation resistance (2)
Figure 8 – Example of Method 3 for testing the insulation resistance
Figure 9 – Example of Method 4 for testing the insulation resistance [Go to Page]
6.3.3 Applied voltage
6.3.4 Requirements
6.4 Voltage proof (for insulated types only) [Go to Page]
6.4.1 General
6.4.2 Test voltage
6.4.3 Requirements
6.5 Resistance/temperature characteristic [Go to Page]
6.5.1 General
6.5.2 Test methods
6.5.3 Requirements
6.6 Dissipation factor (δ) [Go to Page]
6.6.1 General
6.6.2 Initial measurements
6.6.3 Test methods
Figure 10 – Example of test chamber [Go to Page]
6.6.4 Requirements
6.7 Thermal time constant by ambient temperature change (τa) [Go to Page]
6.7.1 The hot to cold thermal time constant for ambient temperature change
Figure 11 – Dissipation factor measuring circuit [Go to Page]
6.7.2 The cold to hot thermal time constant for ambient temperature change
6.7.3 Final measurements and requirements
6.7.4 Requirements
6.8 Thermal time constant by cooling after self-heating (τc) [Go to Page]
6.8.1 General
6.8.2 Initial measurements
6.8.3 Preconditioning
6.8.4 Test method
6.8.5 Final measurements and requirements
7 Mechanical test and measurements [Go to Page]
7.1 Visual examination and check of dimensions [Go to Page]
7.1.1 Visual examination
Figure 12 – Thermal time constant measuring circuit [Go to Page]
7.1.2 Dimensions
7.2 Robustness of terminations (not applicable to surface mount thermistors) [Go to Page]
7.2.1 General
7.2.2 Initial measurements
7.2.3 Test methods
7.2.4 Test Ua1 – Tensile
7.2.5 Test Ub – Bending (half the number of terminations)
7.2.6 Test Uc – Torsion (remaining terminations)
7.2.7 Final measurements and requirements
7.3 Vibration [Go to Page]
7.3.1 General
7.3.2 Initial measurements
7.3.3 Test procedures
Table 2 – Tensile force [Go to Page]
7.3.4 Final inspection, measurements and requirements
7.4 Shock [Go to Page]
7.4.1 General
7.4.2 Initial measurements
7.4.3 Mounting
7.4.4 Test procedures
7.4.5 Final inspection, measurements and requirements
7.5 Free fall [Go to Page]
7.5.1 General
7.5.2 Initial measurements
7.5.3 Test procedures
7.5.4 Final inspection, measurements and requirements
7.6 Shear (adhesion) test (for surface mount NTC thermistors only) [Go to Page]
7.6.1 General
7.6.2 Initial measurements
7.6.3 Test conditions
7.6.4 Final inspection, measurements and requirements
7.7 Substrate bending test (for surface mount NTC thermistors only) [Go to Page]
7.7.1 General
7.7.2 Initial measurements
7.7.3 Test procedures
7.7.4 Final inspection, measurements and requirements
8 Environmental and climatic tests [Go to Page]
8.1 Rapid change of temperature [Go to Page]
8.1.1 General
8.1.2 Initial measurements
8.1.3 Test procedures
8.1.4 Final inspection, measurements and requirements
8.2 Thermal shock [Go to Page]
8.2.1 General
8.2.2 Initial measurements
8.2.3 Test procedures
8.2.4 Final inspection, measurements and requirements
8.3 Cold [Go to Page]
8.3.1 General
8.3.2 Initial measurements
8.3.3 Test procedures
8.3.4 Final inspection, measurements and requirements
8.4 Dry heat [Go to Page]
8.4.1 General
8.4.2 Initial measurements
8.4.3 Test procedures
8.4.4 Final inspection, measurements and requirements
8.5 Damp heat, steady state [Go to Page]
8.5.1 General
8.5.2 Initial measurements
8.5.3 Test procedures
8.5.4 Recovery
8.5.5 Final inspection, measurements and requirements
8.6 Endurance [Go to Page]
8.6.1 General
8.6.2 Endurance at room temperature with applied continuous maximum current (Imax25) (for inrush current-limiting thermistors only)
Figure 13 – Endurance at room temperature with Imax25 evaluating circuit [Go to Page]
8.6.3 Endurance at room temperature with applied cyclic maximum current (Imax25) (for inrush current-limiting thermistors only)
Figure 14 – Endurance at room temperature with Imax25 evaluating circuit [Go to Page]
8.6.4 Endurance at T3 and Pmax (for other than inrush current-limiting thermistors only)
8.6.5 Endurance at upper category temperature
8.6.6 Maximum permissible capacitance (for inrush current-limiting thermistors only)
Figure 15 – Maximum permissible capacitance test circuit (Method 1)
Figure 16 – Maximum permissible capacitance test circuit (Method 2)
8.7 Salt mist [Go to Page]
8.7.1 General
8.7.2 Initial measurements
8.7.3 Test conditions
8.7.4 Final inspection, measurements and requirements
8.8 Sealing
8.9 Composite temperature/humidity cycle [Go to Page]
8.9.1 General
8.9.2 Initial measurements
8.9.3 Test conditions
8.9.4 Final inspection, measurements and requirements
9 Tests related to component assembly [Go to Page]
9.1 Resistance to soldering heat [Go to Page]
9.1.1 General
9.1.2 Preconditioning
9.1.3 Initial measurements
9.1.4 Test procedure
9.1.5 Recovery
9.1.6 Final inspection, measurement and requirements
9.2 Solderability [Go to Page]
9.2.1 General
9.2.2 Initial measurements
9.2.3 Test procedure
9.2.4 Final inspection, measurements and requirements
9.3 Component solvent resistance [Go to Page]
9.3.1 General
9.3.2 Initial measurements
9.3.3 Test conditions
9.3.4 Requirements
9.4 Solvent resistance of marking [Go to Page]
9.4.1 General
9.4.2 Initial measurements
9.4.3 Test conditions
9.4.4 Requirements
Annex A (normative)Rules for the preparation of detail specifications fordirectly heated NTC thermistors for electronic equipment foruse within quality assessment systems [Go to Page]
A.1 Drafting
A.2 Reference standard
A.3 Circulation
Annex B (informative)Typical examples of mountings for measurementsof directly heated thermistors [Go to Page]
Table B.1 – Recommended land dimensions
Figure B.1 – Mounting for measurements of surface mount thermistors
Annex Q (informative)Quality assessment procedures [Go to Page]
Q.1 General [Go to Page]
Q.1.1 Scope of this annex
Q.1.2 Quality assessment definitions
Q.1.3 Rework
Q.1.4 Alternative test methods
Q.1.5 Certified test records of released lots
Q.1.6 Unchecked parameters
Q.1.7 Delayed delivery
Q.1.8 Repair
Q.1.9 Registration of approvals
Q.1.10 Manufacture outside the geographical limits
Q.2 Qualification approval (QA) procedures [Go to Page]
Q.2.1 Eligibility for qualification approval
Q.2.2 Application for qualification approval
Q.2.3 Subcontracting
Q.2.4 Test procedure for the initial product qualification approval
Q.2.5 Granting of qualification approval
Q.2.6 Maintenance of qualification approval
Q.2.7 Quality conformance inspection
Q.3 Capability approval (CA) procedures [Go to Page]
Q.3.1 General
Q.3.2 Eligibility for capability approval
Q.3.3 Application for capability approval
Q.3.4 Subcontracting
Q.3.5 Description of the capability
Q.3.6 Demonstration and verification of capability
Q.3.7 Granting of capability approval
Q.3.8 Maintenance of capability approval
Q.3.9 Quality conformance inspection
Q.4 Technology approval (TA) procedure [Go to Page]
Q.4.1 General
Q.4.2 Eligibility for technology approval
Q.4.3 Application of technology approval
Q.4.4 Subcontracting
Q.4.5 Description of technology
Q.4.6 Demonstration and verification of the technology
Q.4.7 Granting of technology approval
Q.4.8 Maintenance of technology approval
Q.4.9 Quality conformance inspection
Q.5 Interpretation of sampling plans and procedures as described in IEC 60410 for use within quality assessment systems
Q.6 Rules for the preparation of detail specifications for NTC thermistors for electronic equipment for use within quality assessment systems [Go to Page]
Q.6.1 Drafting
Q.6.2 Reference standard
Q.7 Layout of the first page of a PCP/CQC specification
Q.8 Requirements for capability approval test report [Go to Page]
Q.8.1 General
Q.8.2 Requirements
Q.8.3 Summary of test information (for each CQC)
Q.8.4 Measurement record
Q.9 Guidance for the extension of endurance tests on fixed thermistor [Go to Page]
Q.9.1 Overview
Q.9.2 Guidelines
Annex X (informative)Cross-references to IEC 60539-1:2016
Bibliography [Go to Page]

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BS EN IEC 60539-1:2023 - TC Tracked Changes. Directly heated negative temperature coefficient thermistors - Generic specification, 2023

⨯To continue with accurate pricing,
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