In PNP transistor, the emitter is P-type, base is N-type and collector is P-type. In NPN transistor, the emitter is N-type, base is P-type and collector is N-type. The following table highlights the key differences between NPN transistor and PNP transistor − DifferenceĪ type of transistor in which a thin layer of P-type semiconductor sandwiched between two layers of N-type semiconductor is known as NPN-transistor.Ī type of transistor in which a thin layer of N-type semiconductor sandwiched between two layers of P-type semiconductor is known as PNP transistor. Difference between NPN and PNP Transistor The circuit symbol of PNP transistor is shown in Figure-2. In a PNP transistor, the emitter and collector are made of P-type semiconductor material while the base is made of N-type material. When a thin layer of N-type semiconductor material is sandwiched between two layers of P-type semiconductor material, the resulting transistor is known as a PNP transistor. The symbol of the NPN transistor is shown in Figure-1. Hence, in case of NPN transistor, the emitter and collector are of N-type while the base is of P-type. What is NPN Transistor?Īn NPN transistor is the one in which two layers of N-type semiconductor material are separated by a thin layer of P-type semiconductor material. Read through this article to find out more about NPN transistor (BJT) and PNP transistor and the key differences between them. The three terminals are taken out from these three layers.īased on the arrangement of the semiconductor layers, the transistors are of two types as −
A transistor (or bipolar junction transistor) is a three-terminal, three-layer and two-junction semiconductor device, used as the digital switch and amplifier in the electronic circuits.Ī transistor consists of three layers of P-type and N-type semiconductor materials and the name of these layers are emitter, base and collector.
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