What is MOSFET?

• MOSFET is an advanced type of FET, having 4 Terminals, named as:
  1. Drain(D)
  2. Gate(G)
  3. Source(S)
  4. Body(B)

where,

• Gate(G) Terminal is practically insulated from the entire assembly by a thin layer of Silicon-oxide(SiO2).
• Body(B) Terminal is connected internally with Source(S) Terminal & thus the MOSFET package consists of 3 pins.

MOSFET stands for "Metal-oxide Semiconductor Field Effect Transistor". Although MOSFET has 4 terminals, as I have mentioned before, the 4th terminal is internally connected with the Source terminal & thus the package consists of 3 Pins, such as the MOSFET Symbol. MOSFET symbols are shown below figure:

• Unlike BJT, MOSFET requires almost no input current & controls heavy current at the output.
• MOSFETs are quicker in operation than FETs, thus used in fast switching applications.

• FET has high drain resistance, while it's too low in MOSFET.

                                   MOSFET Symbol