Difference Between NPN and PNP Transistor

There can be a small 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 transistors, the majority charge carriers are holes whereas in NPN the majority charge carriers are electrons.

Difference Between NPN and PNP Transistor

Difference Between NPN and PNP Transistor

PNP switches On by a low signal whereas NPN switches ON by a high 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 switches 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 difference between NPN and PNP transistor. If you wish to find out more, download BYJU’S The Learning App.

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