Distinction between a BJT and FET




Distinction between a BJT and FET:

BJT

FET

BJT is a bipolar device i.e. the conduction is because of two (bi) carriers - electrons and holes.

FET is a Unipolar device i.e. the conduction is because of either electrons in case of n-channel FET or holes in case of p-channel FET.

BJT is a Current controlled Device. This means that the output current is a function of the input current.

FET is a Voltage Controlled Device. This means that the output current is a function of the input voltage

There are two types: n-p-n and p-np BJT transistors

These are two types: n-channel and p-channel FETs

Comparatively low input impedance

Very high input impedance 

Difficult to integrate on Integrated Chips

Easy to integrate on Integrated Chips