The only difference is in their biasing and the polarity of the power supply for each type. The principle of operation of NPNs and PNPs is exactly the same. The basic principle of any BJT is to control the current of a third terminal with the voltage between the other two terminals. Here is a list of some classic general-purpose BJTs (Fig. In a PNP transistor, however, the current flows from the emitter to the collector (Fig. In an NPN transistor, the current flows from the collector (C) to the Emitter (E) (Fig. In a PNP transistor, a positive voltage is given to the emitter terminal to produce current flow from the emitter to collector. In an NPN transistor, a positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter.
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