Discussion
What limits the switching speed of a junction diode?
Answer: D
The minority carrier charge stored during conduction must be swept out before the diode can block, and that reverse recovery time sets the speed. Depletion formation is fast, the package's thermal constant is far slower but irrelevant to switching, and establishing the forward drop is quick. Stored charge is why Schottky diodes, which store almost none, switch so much faster, and it is the property to look for in any fast switching application. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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