BS EN IEC 61051-1:2018 – TC:2020 Edition
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Tracked Changes. Varistors for use in electronic equipment – Generic specification
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 157 |
IEC 61051-1:2018 is available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61051-1:2018 is a generic specification and is applicable to varistors with symmetrical voltage-current characteristics for use in electronic equipment. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications for quality assessment or any other purpose. This edition includes the following significant technical changes with respect to the previous edition: a) 10 new terms and definitions – leaded varistors, surface mount varistors(SMV), electrostatic discharge (ESD), ESD clamping voltage, equivalent rectangular pulse duration, maximum peak current derating characteristic, rated average dissipation power, rated energy, abnormal overvoltage withstanding duration and temperature derating curve – have been added (see 3.6, 3.7, 3.14, 3.15, 3.19, 3.20, 3.23, 3.24, 3.25 and 3.29); b) General requirements for electrical tests and 7 new test items – clamping voltage, ESD clamping voltage, maximum peak current, rated average dissipation power, rated energy, electrostatic discharge (ESD), robustness of terminations of surface mount varistors – have been added (see 6.5, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16 and 6.17.8); c) In 6.6, 6.7, 6.8, 6.9.3, 6.23.2, 6.23.4 and 6.26, following test items have been revised: – Varistor voltage, leakage current and capacitance: more detailed requirements and information have been added; – Voltage proof – foil method: the space between the edge of the foil and each termination has been changed from 1 mm ~ 1,5 mm to 3 mm ~ 3.5 mm for testing varistors not having axial terminations and the minimum space between the foil and the termination has been changed from 1 mm to 3 mm for testing varistors having axial terminations; – Climatic sequence – dry heat: the method has been changed from Ba to Bb; – Climatic sequence – cold: the method has been changed from Aa to Ab; – Endurance at upper category temperature: the method of “ applying test voltages in cycles of 1,5 h on and 0,5 h off” has been changed to the method of applying test voltages continuously throughout the test lasting for 1 000 h; d) The test items of pulse current, voltage under pulse condition and bump have been deleted from the section of test and measurement procedures; e) Annex A and the contents referring to the test fixture specified in Annex A have been deleted; f) All contents related to silicon carbide varistors have been deleted; g) A new normative annex entitled “Test pulses used in this specification” (Annex B) has been added; h) A new informative annex entitled ‘Recommended measurement/test methods for characteristics and parameters for application reference’ (Annex C) has been added, in which guidelines of measuring/testing characteristics and parameters for application reference including voltage vs. current characteristic, maximum peak current derating characteristic, thermal resistance and abnormal overvoltage withstanding duration have been given.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 97 | undefined |
| 100 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 102 | English CONTENTS |
| 107 | FOREWORD |
| 109 | 1 Scope 2 Normative references |
| 110 | 3 Terms and definitions |
| 115 | 4 Technical data 4.1 Units, symbols and terminology 4.2 Preferred values and characteristics 4.3 Marking 4.3.1 General |
| 116 | 4.3.2 Coding 5 Quality assessment procedures 5.1 General 5.1.1 Overview 5.1.2 Applicability of qualification approval 5.1.3 Applicability of capability approval |
| 117 | 5.1.4 Applicability of technology approval 5.2 Primary stage of manufacture 5.3 Subcontracting 5.4 Structurally similar components |
| 118 | 5.5 Qualification approval procedures 5.5.1 Eligibility for qualification approval 5.5.2 Application for qualification approval 5.5.3 Test procedure for qualification approval 5.5.4 Granting of qualification approval 5.5.5 Maintenance of qualification approval 5.5.6 Quality conformance inspection |
| 119 | 5.6 Capability approval procedures 5.6.1 General 5.6.2 Eligibility for capability approval 5.6.3 Application for capability approval 5.6.4 Description of capability Figures Figure 1 – General scheme for capability approval |
| 120 | 5.6.5 Demonstration and verification of capability |
| 121 | 5.6.6 Programme for capability approval 5.6.7 Capability approval test report 5.6.8 Abstract of description of capability 5.6.9 Modifications likely to affect the capability approval 5.6.10 Initial capability approval |
| 122 | 5.6.11 Granting of capability approval |
| 123 | 5.6.12 Maintenance of capability approval 5.6.13 Extension of capability approval 5.6.14 Quality conformance inspection 5.7 Rework and repair 5.7.1 Rework |
| 124 | 5.7.2 Repair 5.8 Release for delivery 5.8.1 General 5.8.2 Certified records of released lots 5.8.3 Delayed delivery 5.8.4 Release for delivery before the completion of Group B tests 5.9 Alternative test methods |
| 125 | 5.10 Unchecked parameters 5.11 Characteristics and parameters for application reference 5.12 Technology approval procedures 5.12.1 General 5.12.2 Eligibility for technology approval 5.12.3 Application of technology approval 5.12.4 Description of technology 5.12.5 Demonstration and verification of the technology |
| 126 | 5.12.6 Granting of technology approval 5.12.7 Maintenance of technology approval 5.12.8 Quality conformance inspection 5.12.9 Failure rate level determination 5.12.10 Outgoing quality level 6 Test and measurement procedures 6.1 General 6.2 Standard atmospheric conditions 6.2.1 Standard atmospheric conditions for testing |
| 127 | 6.2.2 Recovery conditions 6.2.3 Referee conditions 6.2.4 Reference conditions 6.3 Drying and recovery 6.3.1 General 6.3.2 Procedure I 6.3.3 Procedure II Tables Table 1 – Standard atmospheric conditions |
| 128 | 6.4 Visual examination and check of dimensions 6.4.1 Visual examination 6.4.2 Marking 6.4.3 Dimensions (gauging) 6.4.4 Dimensions (detail) 6.5 General requirements for electrical tests |
| 129 | 6.6 Varistor voltage 6.7 Leakage current |
| 130 | 6.8 Capacitance 6.9 Voltage proof (for insulated varistors only) 6.9.1 General 6.9.2 V-block method 6.9.3 Metal ball method 6.9.4 Foil method |
| 131 | 6.10 Insulation resistance (for insulated varistors only) 6.10.1 Test procedure 6.10.2 Measurement and requirements 6.11 Clamping voltage |
| 132 | 6.12 ESD clamping voltage (for surface mount electrostatic protective varistors only) 6.13 Maximum peak current 6.13.1 Initial measurement 6.13.2 Test procedure 6.13.3 Final inspection, measurement and requirements 6.14 Rated average dissipation power 6.14.1 General |
| 133 | 6.14.2 Initial measurement 6.14.3 Test procedure 6.14.4 Final inspection, measurement and requirements 6.15 Rated energy 6.15.1 General 6.15.2 Initial measurement |
| 134 | 6.15.3 Test procedure 6.15.4 Final inspection, measurement and requirements |
| 135 | 6.16 Electrostatic discharge (ESD) (for surface mount electrostatic protective varistors only) 6.16.1 Initial measurement 6.16.2 Test procedure 6.16.3 Final inspection, measurement and requirements 6.17 Robustness of terminations 6.17.1 General 6.17.2 Test Ua1 – Tensile 6.17.3 Test Ub – Bending (half of the number of terminations) 6.17.4 Test Uc – Torsion (the other half of the number of terminations) |
| 136 | 6.17.5 Test Ud – Torque (for terminations with threaded studs or screws and for integral mounting devices) 6.17.6 Visual examination 6.17.7 Final measurement 6.17.8 Robustness of terminations of surface mount varistors Table 2 – Force for wire terminations Table 3 – Torque |
| 137 | 6.18 Resistance to soldering heat 6.18.1 Preconditioning 6.18.2 Test procedure |
| 138 | 6.18.3 Recovery 6.18.4 Final inspection, measurement and requirements 6.19 Solderability 6.19.1 General 6.19.2 Test procedure |
| 139 | 6.19.3 Final inspection, measurements and requirements 6.20 Rapid change of temperature 6.20.1 Initial measurement 6.20.2 Test procedure 6.20.3 Final inspection, measurement and requirements 6.21 Shock 6.21.1 Initial measurement 6.21.2 Test procedure 6.21.3 Final inspection, measurement and requirements |
| 140 | 6.22 Vibration 6.22.1 Initial measurement 6.22.2 Test procedure 6.22.3 Final inspection, measurement and requirements 6.23 Climatic sequence 6.23.1 General 6.23.2 Initial measurement 6.23.3 Dry heat 6.23.4 Damp heat, cyclic, Test Db, first cycle 6.23.5 Cold 6.23.6 Low air pressure |
| 141 | 6.23.7 Damp heat, cyclic, Test Db, remaining cycles 6.23.8 Final inspection, measurement and requirements 6.24 Damp heat, steady state 6.24.1 Initial measurement 6.24.2 Test procedure 6.24.3 Final inspection, measurement and requirements Table 4 – Number of cycles |
| 142 | 6.25 Fire hazard 6.26 Endurance at upper category temperature 6.26.1 Test system 6.26.2 Initial measurement 6.26.3 Mounting of the samples |
| 143 | 6.26.4 Test procedure, measurement and requirements 6.27 Solvent resistance of marking 6.27.1 Test procedure 6.27.2 Requirements 6.28 Component solvent resistance 6.28.1 Initial measurements 6.28.2 Test procedure |
| 144 | 6.28.3 Measurement and requirements 6.29 Mounting (for surface mount varistors only) Figure 2 – Mounting method for measurement of surface mount varistors |
| 146 | Annex A (informative) Rules for the preparation of detail specifications for capacitors and resistors for electronic equipment |
| 147 | Annex B (normative) Test pulses used in this specification B.1 Types of test pulses B.1.1 General B.1.2 Pulse type 1 B.1.3 Pulse type 2 (rectangular pulse) B.1.4 Pulse type 3 (ESD discharge pulse) Figure B.1 – Shape of pulse current type 1 |
| 148 | B.2 Pulse parameters B.2.1 Value of the pulse current/voltage B.2.2 Virtual front time T1 Figure B.2 – Shape of pulse voltage type 1 Figure B.3 – Shape of pulse type 2 |
| 149 | B.2.3 Virtual origin O1 B.2.4 Virtual time to half-value T2 B.2.5 Virtual duration of peak of a rectangular pulse current TD B.2.6 Virtual total duration TT of a pulse current Figure B.4 – Shape of pulse type 3 |
| 150 | B.3 Tolerances for the pulses Table B.1 – Accepted differences between specified and recorded pulse values Table B.2 – Tolerances for pulse type 3 |
| 151 | Annex C (informative) Recommended measurement/test methods for characteristics and parameters for application reference C.1 Voltage vs. current characteristic |
| 152 | C.2 Maximum peak current derating characteristic C.2.1 Rationale related to this test C.2.2 Failure criteria C.2.3 Pulse life test |
| 154 | C.2.4 Graphing of the maximum peak current derating curves C.3 Thermal resistance (for leaded varistors only) C.3.1 Test system Figure C.1 – Maximum peak current derating characteristic |
| 155 | C.3.2 Mounting of the sample C.3.3 Test procedure C.4 Abnormal overvoltage withstanding duration C.4.1 Test system |
| 156 | C.4.2 Test procedure C.4.3 Requirements |
