Main Difference Between MOSFET and BJT

The main difference between MOSFET and BJT is, MOSFET is a Unipolar Device and BJT is a Bipolar device. MOSFET is a Voltage controlled device and BJT is a current controlled device.

The Full form of BJT is Bipolar Junction Transistor.

The Full form of MOSFET is Metal Oxide Semiconductor Field Effect Transistor

The working of MOSFET and BJT are almost the same. There is little difference between BJT and MOSFET. So let's see the important differences between BJT and MOSFET.

MOSFET VS BJT

1. As it already said MOSFET is a Unipolar Device because of the current conduction through MOSFET is done by either electrons or holes. In P-channel MOSFET current conduct by holes and in N-channel MOSFET current conduct by electrons.

But BJT is a Bipolar Device because electron and hole both participate for current conduction.

2. The other most important difference between BJT and MOSFET is, BJT is a current controlled device because when base current is given BJT starts conduction but MOSFET is a voltage controlled device because when a gate to source voltage is given MOSFET starts conduction.

3. BJT has three terminals named as Emitter, Base, Collector. But MOSFET has three terminals named as Source, Drain, Gate. MOSFET is better for switching applications whereas BJT is better for Amplification application.

4. MOSFET has very high input resistance as it is a Voltage controlled device but BJT has low input resistance as it is a current controlled device.

5. MOSFET has a lower Transconductance per unit current but BJT has higher Transductance per unit current.

6. MOSFET is faster in operation than BJT. So, in high frequency switching applications MOSFET provides better response than BJT.

7. MOSFET is used for high power and voltage control. BJT is used with small power and voltage.

8. The constructional difference between BJT and MOSFET is, BJT has not any metal in its construction but MOSFET has metal oxide as its name suggests.

9. The switching speed of MOSFET faster than BJT. For this reason, MOSFET can give better performance in digital circuits.

10. MOSFET mainly used for switching purpose in power circuits whereas BJT used for amplifying and switching in smaller low power circuits and devices.

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• [Explained] Applications and Advantages of SCR

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