Which transistor is best suitable to achieve very fast switching in digital circuits?

Which transistor is best suitable to achieve very fast switching in digital circuits? Correct Answer Schottky transistor

Fast switching can be achieved, if the transistor is prevented from entering into saturation. In schottky transistor, schottky diode is used to clamp between base and collector. Whenever the base current increases to saturation, the diode conducts. Thus, the base to collector voltage drops to 0.4v (less than VBE(cut-in)=0.5) and the transistor does not enter into saturation .
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