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The majority of charge carriers in an NPN transistor are electrons, whereas the minority are holes. PNP Transistor consists of two n-type semiconductor layers separated by a thin p-type semiconductor layer. When the base terminal is pulled to LOW in comparison to the emitter terminal, the transistor will switch on.The current flows from the emitter terminal to the collector terminal in this transistor.

The majority of charge carriers in these transistors are holes, whereas the minority are electrons. A thin n-type semiconductor layer separates these materials. In these types of transistors, there are two p-type semiconductor materials.

NPN and PNP are the two main types of bipolar junction transistors.īipolar Junction Transistor i) NPN Transistor.

A little current flowing from the emitter to the collector region of the transistor causes a considerably bigger current to flow from the base to the emitter.

Different from FET transistors, bipolar junction transistors are current-controlled devices. Some of these are –īipolar Junction Transistors are those types of transistors that are made up of three regions: the base, collector, and emitter. There are many types of transistors that can be classified on the basis of their application.