26. Transistor Reliability

Question.4

Sam uses a BJT transistor to drive a load in their circuit. After turning ON the circuit, the transistor slowly gets hotter, draws more current, and eventually fails, even though it was initially working fine.

What is the reason for this behavior?

The transistor voltage rating is too high
Increase in temperature causes the BJT to draw more current
The load resistance increases with temperature
The PCB copper area is too large

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