Discussion
What does a device's junction-to-case thermal resistance describe?
Answer: C
Thermal resistance is degrees of rise per watt dissipated, so it converts power into a temperature difference exactly as an electrical resistance converts current into a voltage difference. The maximum power, the thermal time constant and the failure temperature are separate specifications. Treating a thermal path as a series circuit with power in place of current and temperature in place of voltage makes every such calculation routine. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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