Advantages of MOSFET | disadvantages of MOSFET

This page covers advantages and disadvantages of MOSFET. It mentions MOSFET advantages or benefits and MOSFET disadvantages or drawbacks.

What is MOSFET?

MOSFET is the short form of Metal Oxide Semiconductor Field Effect Transistor. It uses MIS diode as its basic component for construction. MIS (Metal Insulator Semiconductor) is a 3-layer structure which uses insulator oxides (SiO2, Al2O3, Si3N4) between Al (Aluminium) and semiconductor (Si/Ge/GaAs). When Al-SiO2-Si is used to form MIS structure, it is referred as MOSFET.

MOSFET structure

MOSFET has four terminals e.g. Gate, Source, Drain and Substrate. There are two types of MOSFET viz. n-channel MOSFET and p-channel MOSFET. Moreover there are two categories in each of these types. As a result, MOSFET operates in any of the following modes.
• n-channel Enhancement Mode (OFF)
• n-channel depletion Mode (ON)
• p-channel Enhancement Mode (OFF)
• p-channel depletion Mode (ON)
Refer MOSFET versus BJT >> and Depletion MOSFET vs Enhancement MOSFET >>.

Benefits or advantages of MOSFET

Following are the benefits or advantages of MOSFET:
➨They can be operated in either enhancement mode or depletion mode.
➨They have much higher input impedance compare to JFET.
➨They have high drain resistance due to lower resistance of channel.
➨They are easy to manufacture.
➨They support high speed of operation compare to JFETs.

Drawbacks or disadvantages of MOSFET

Following are the disadvantages of MOSFET:
➨In MOSFET, the layer between Gate and Channel is very fragile which is vulnerable to electro-static damage during installation. It requires well designed circuit to avoid the issue.
➨MOSFET is very susceptible to overload voltages, hence special handling is required during installation.

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