A power transistor is specified to have a maximum junction

Last updated: 6/14/2023

A power transistor is specified to have a maximum junction temperature Ti max of UN 130 C When operated at this maximum temperature with a heat sink the case temperature Te is found to be 90 C The case is attached to the heat sink with a bond having a thermal resistance Ocs 0 5 C W and the thermal resistance of the heat sink 0SA 0 1 C W If the ambient temperature TA is 30 C what is the power being dissipated in the device What is the thermal resistance 0 c of the device from junction to the case