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Thermal resistance characterization of Power MOSFETs

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  • Author: Anup Bhalla
Power MOSFET junction temperature influences many operational parameters and device lifetime. To estimate device junction temperature in a circuit, or to compare MOSFETs for a target application, some basic data on thermal resistance is provided in the datasheet. In this article, we describe how the measurements are done and how the thermal resistance limits are set. We consider briefly both steady-state and transient thermal impedance of the MOSFET.
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