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Difference between NPN and PNP transistors

Parameter

NPN

PNP

Definition

A lightly doped P type semiconductor material is placed in between two N type material

A lightly doped N type semiconductor material is placed in between two P type material

Majority charge carriers

Electrons are the majority charge carriers

Holes are the majority charge carriers

Symbol

Direction of the arrow in the symbol

The arrow points outside

The arrow points inside

Direction of the flow of current

Electrons flow from emitter to collector

Holes flow from emitter to collector

Construction

Mobility

Mobility of the electrons is high

Mobility of the holes is less

Two diode model

Commonly used

NPN transistor is commonly used because of its high mobility

PNP is not commonly used because of its low mobility

Working of the transistor

Forward biased

Emitter base junction

Emitter base junction

Reverse biased

Collector base junction

Collector base junction


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