Question

For BJT power transistors, the collector terminal is always connected to the transistor’s case________

(a) for easy circuit connection

(b) to prevent shorts

(c) because the collector terminal is the critical terminal for heat dissipation

(d) because the collector terminal is located nearest the case

I have been asked this question by my school teacher while I was bunking the class.

I would like to ask this question from Classification of Output Stages topic in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

Answer 1

Correct choice is (c) because the collector terminal is the critical terminal for heat dissipation

To explain I would say: Transistor case is used for power transistors as the power dissipated at their collector junction is large. If heat dissipation is not done, this will cause large increases in junction temperature.