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Study for the derating curve of surface mount fixed resistors - Derating curves based on terminal part temperature
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Published date: 24-05-2017
Publisher: International Electrotechnical Committee
FOREWORDINTRODUCTION1 Scope 2 Normative references 3 Terms and definitions 4 Study for the derating curve of surface mount fixed resistorsAnnex 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 boardAnnex 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 resistorsAnnex G (informative) - How to measure the surface hotspot temperatureAnnex 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 resistorsAnnex J (informative) - The variation of the heat dissipation fraction caused by the difference between the resistor and its mounting configurationAnnex K (informative) - Influence of airflow on SMD resistors Annex L (informative) - The influence of the spatial resolution of the thermographAnnex M (informative) - Future subjectsBibliography
IEC TR 63091:2017(E) is a technical report and is applicable to SMB 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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