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What is the ON resistance of a transistor?

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What is the ON resistance of a transistor?

(a) RON = VCEsat/βIB

(b) RON = VCEsat + VA/ICsat

(c) RON = VCEsat/(β+1)IB

(d) RON = VCEsat/ICsat

The question was asked at a job interview.

The origin of the question is Transistor Switching Network topic in section Transistor Biasing and Low Frequencies of Analog Circuits

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Right choice is (d) RON = VCEsat/ICsat

Explanation: In the saturation region, we consider that the transistor acts as an ON switch. In this region, both collector-to-emitter voltage as well current are constant and do not change. The ON resistance is the ratio of this saturation voltage to saturation current.

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