Home › Electronic Devices & Circuits › A transistor dissipates 2 W. If the total junction-to-ambient thermal resistance is 30 degrees C/W and ambient temperature is 25 degrees C, the estimated junction temperature is?

MCQ Practice Question

Electronic Devices & Circuits Thermal Design

A transistor dissipates 2 W. If the total junction-to-ambient thermal resistance is 30 degrees C/W and ambient temperature is 25 degrees C, the estimated junction temperature is?

A55 degrees C
B60 degrees C
C85 degrees C
D115 degrees C

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Correct Answer: C. 85 degrees C

Explanation: Temperature rise is P×theta = 2×30 = 60 degrees C. Adding 25 degrees C ambient gives an estimated junction temperature of 85 degrees C.

Reference: Standard electronics: thermal resistance calculation

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