What does the term \"punchthrough\" refer to in a BJT transistor? O A collector

Question

What does the term "punchthrough" refer to in a BJT transistor? O A collector breakdown mechanism caused by impact ionization due to collisions of high-speed charge carriers O The extension of the collector-base depletion region all the way to the base-emitter junction due to an increase in reverse-bias voltage across the collector-base junction The appearance of a small leakage current on the collector when the transistor is in cutoff The sudden increase in collector current when the collector-base voltage increases beyond the Early voltage.

Explanation / Answer

PUNCH THROUGH EFFECT IN BJT :

The punch through effect occurs when the collector base depletion region extension into the base emitter region resulting in large collector current Hence option b is the correct answer. It will lead to destruction of transistor due to excessive power dissipation

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