The PNP transistor is formed three layer of semiconductor, one is N-type and other two are P-type. The structure thus formed will be a PNP transistor. It will have three terminal, the first P-type semiconductor is called emitter and the other P-type material is termed as the collector.
NPN and PNP refer to the arrangement of the pieces that make up the transister. … An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. Below is a typical cross section of a transistor.