What is a MOSFET?

MOSFET is an acronym for metal-oxide semiconductor field effect transistor.

MOSFET’s have two modes: depletion & enhancement

• Depletion mode MOSFETS work like normally closed switches, current can flow when no voltage is applied, but a negative voltage causes current flow to stop.
• Enhancement mode MOSFETS work like variable resistors- these are the most commonly used type of transistors. There are N & P channel MOSFETS.
• There are three pins on a MOSFET. The Source, the Gate, and the Drain
• They function as variable resistors controlled by voltage, meaning that the resistance between the drain and source varies based on the voltage applied

Body Diode:

MOSFET vs BJT

The Bipolar Junction Transistor (BJT) is a current-driven device (in contrast, MOSFET is voltage-driven). MOSFETS are very voltage focused devices, the input current is not directly related to the output current, BJTs are a better alternative for current adjustments

3 Terminal MOSFET

4 Terminal MOSFET

https://images.app.goo.gl/ZbKCVJZn4vnirNVu5

PMOS

The PMOS is normally open. Which means the switch is ON.