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The diode on the left region is referred to as emitter-base diode. The base is region is very thin and is the region where two diodes are connected back to back. This transistor is made of three components or three main regions. Structure on NPN Transistor Parts of NPN Transistor

They are the most used type of bipolar junction transistors and the reason behind this is the mobility of their electrons is many times higher than that of the holes (mobility of holes). In simple words, one p-type semiconductor material is present between the two n-type semiconductor materials. Basically, in NPN transistors two n-type (negative) materials dope the single p-type (negative) materials. It is the most often used in all type of transistors. NPN stands for Negative-Positive-Negative configuration.

NPN transistor is one of the types of Transistors (BPT). Bipolar junction transistors are of two types mainly.