Saturday 2 March 2019

switches - BJTs versus (MOS)FET to switch a load from a microcontroller


I would like to know what are the reasons for choosing bipolar junction transistor (BJT) versus a field-effect transistor (FET) (MOSFET or a JFET) to switch a load from a microcontroller. In our hypothetical situation, assume that the load requires more current than the microcontroller can provide, and the question is what considerations would bias in favor or against the BJT and a FET switch design, assuming that "ease of use" is not a consideration.


This question is a more specific version of the when to use what transistor question.




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