PD IEC/TR 63091:2017

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

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.

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