What is MOSFET? Working, Types and Testing
(Metal Oxide Semiconductor Field effect Transistor)
MOSFET is just like Transistor, it advances from Transistor. It is also a semiconductor device used to amplify, High speed switching, oscillator, as switch, voltage regulate, and DC to AC electronic signals and electrical power.
It has three terminals Drain (D) Source (S) and Gate (G). It is denoted by ‘Q’ ‘PQ’ ’U’ and comes in number.
Testing of MOSFET
Find out N-Channel and P-Channel
MM set on beep mode
N-Channel MOSFET: Connect the black probe to the drain and the red probe to the source of the MOSFET. And if you get a value on the screen of Multimeter then this MOSFET is N-Channel.
P-Channel MOSFET: Connect the red probe to drain and black probe to the source and if you get a value then it’s a P-Channel MOSFET.
N-channel Working MOSFET: Now Pick an N-channel MOSFET and connect the black probe to the drain and the red probe to the Gate. If you don’t see any values than it’s a working MOSFET.
Faulty Condition: If you see some value than its a short MOSFET, a leaked MOSFET, or Open.
Since it’s a working MOSFET we should ON and OFF Manually:
- Connect the black probe to the drain and touch the red probe for few seconds to the gate. Then touch the red probe to the source while the black probe should stay connected to the drain.
- You’ll hear a beep which shows that your MOSFET is ON and is in working condition.
- Remember to do the same test again when you have to release to OFF the MOSFET. You can do this by holding a MOSFET for few seconds
Between your fingers or just connect the black probe to all three pins
At same time.