67. Transistor Reliability

Question.5

You are testing a circuit where a transistor is driven directly from a microcontroller pin, with no resistor between the MCU pin and the transistor’s control pin.

The circuit works initially, but after some time the transistor or MCU pin fails.

What is the reason for this failure?

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The transistor was too powerful for the circuit
Excessive current flowed into the transistor’s control pin
It should have to work because it is correct design
The load current was too low

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