Difference Between NPN and PNP Transistor

There are numerous difference between NPN and PNP transistors, even though both are bipolar junction transistors. There are applications which makes transistors as a device- switch and amplifier. In a PNP transistor, the majority charge carriers are holes whereas in NPN the majority charge carriers are electrons.

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Difference Between NPN and PNP Transistor

What is the Difference Between NPN and PNP Transistor?

PNP switches On by a low signal whereas NPN switches ON by a high signal. As we are aware that in PNP, the P represents the polarity of the emitter terminal and N represents the polarity of the base terminal.

In NPN, N represents the negatively charged coating of the material whereas P represents the charged layer.

Difference Between NPN and PNP Transistor

NPN
PNP
The current flows from collector terminal to emitter terminal The current flows from emitter terminal to collector terminal
It is made up of two N-type material layers with P-type sandwiched It is made of up two P-type material layers with N-type sandwiched
The current flow from the collector is generated by keeping a +ve voltage there The current flow from the emitter to collector is generated at emitter terminal by keeping a +ve voltage there.
The transistor switches ON with the increase in current in the base terminal The transistors switch ON when there is no current flow at the base terminal
When the current is reduced in the base, the transistor doesn’t function across the collector terminal and switches OFF When a current is present at the base of a PNP transistor, then the transistor switches OFF.

These were some NPN and PNP transistor differences. If you wish to find out more, download BYJU’S – The Learning App.


Practise This Question

When a capillary is dipped in water, water rises to a height h. If the length of the capillary is made less than h, then