Calculate the drain current and operating region of an N-Channel MOSFET.
Transistor Biasing
V
V
V
μA/V²
Operating State
Enter parameters to calculate
Overview
The MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is the building block of modern digital electronics. It acts as a voltage-controlled current source or a switch.
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Pro Tips
For a digital switch, you want the MOSFET to be in the Triode region when ON.
The threshold voltage (Vth) is the minimum gate voltage required to create a conduction channel.
Real MOSFETs have a small leakage current even in the Cutoff region.
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Fun Facts
"A modern CPU can contain over 50 billion MOSFETs."
"The first MOSFET was invented by Mohamed Atalla and Dawon Kahng at Bell Labs in 1959."
"MOSFETs are voltage-controlled devices, meaning they consume very little power at the gate."
Formula: Saturation: Id = (kn/2)(Vgs - Vth)²
Triode: Id = kn[(Vgs - Vth)Vds - Vds²/2]
