MOSFET – Metal Oxide Semiconductor Field Effect Transistor – Electric Signal Controlled Switch

MOSFET Drain-Source conduction depends on the voltage at the gate. No current flows through the gate, other than a usually insignificant amount of leakage. There is also small shifting of charges during voltage changes. The gate is very much like a small capacitor.

N channel enhancement mode MOSFET switch circuit using 2N7000 transistor schematic diagram and pin layout by electronzap
N channel enhancement mode MOSFET switch circuit using 2N7000 transistor schematic diagram and pin layout by electronzap
  • N channel enhancement mode MOSFET is off (no Drain-Source conduction) when there is a low enough voltage at the gate.
  • High enough voltage at the gate turns N channel enhancement mode MOSFET on fully. The Drain-Source conducts as well as the particular transistor can. Always consult the datasheet for specifications of any transistor you are interested in.

Video:


N channel

BS250 P channel enhancement mode MOSFET transistor switch circuit schematic diagram by electronzap
BS250 P channel enhancement mode MOSFET transistor switch circuit schematic diagram by electronzap
  • P channel enhancement mode MOSFET is off (no Source-Drain conduction) when there is a high enough voltage at the gate.
  • Low enough voltage at the gate turns P channel enhancement mode MOSFET on fully. The Source-Drain conducts as well as the particular transistor can. Always consult the datasheet for specifications of any transistor you are interested in.

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