Table of Contents

FOREWORD<br>INTRODUCTION<br>1 Scope <br>2 Normative references <br>3 Terms and definitions <br>4 Study for the derating curve of surface mount fixed<br>&nbsp;&nbsp;resistors<br>Annex A (informative) - Background of the establishment<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;of the derating curve based on ambient temperature <br>Annex B (informative) - The temperature rise of SMD<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;resistors and the influence of the printed circuit<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;board<br>Annex C (informative) - The influence of the number of<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;resistors mounted on the test board <br>Annex D (informative) - Influence of the air flow in the<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;test chamber <br>Annex E (informative) - Validity of the new derating<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;curve <br>Annex F (informative) - The thermal resistance of SMD<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;resistors<br>Annex G (informative) - How to measure the surface<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;hotspot temperature<br>Annex H (informative) - How the resistor manufacturers<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;measure the thermal resistance of resistors <br>Annex I (informative) - Measurement method of the<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;terminal part temperature of the SMD resistors<br>Annex J (informative) - The variation of the heat<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dissipation fraction caused by the difference<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;between the resistor and its mounting configuration<br>Annex K (informative) - Influence of airflow on SMD<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;resistors <br>Annex L (informative) - The influence of the spatial<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;resolution of the thermograph<br>Annex M (informative) - Future subjects<br>Bibliography

Abstract

Pertains to SMD resistors with sizes equal or smaller than the RR6332M, including the typical rectangular and cylindrical SMD resistors mentioned in IEC 60115-8.

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Published
Document Type	Standard
Status	Current
Publisher	British Standards Institution
Pages
ISBN
Committee	EPL/40X