![]() Similarly, A PNP-type transistors are the composition of two P-type doped semiconductor materials between an N-type doped semiconductor layer as shown above. The collector terminal is intermediately doped and collects electrons from the Base.Īn NPN type transistor is the composition of two N-type doped semiconductor materials between a P-type doped semiconductor layer as shown above. The Base terminal is lightly doped and passes the emitter-injected electrons onto the collector. The emitter is a heavily doped terminal and it emits the electrons into the Base region. ![]() The transistor has three terminals, namely Base, Emitter, and Collector. Bipolar junction transistors are classified into to types
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