Calculators » MESFET Pinch-Off Voltage Calculator

MESFET Pinch-Off Voltage Calculator

mesfet pinchoff voltage calculator semiconductor electronics

This page provides information about the MESFET pinch-off voltage calculator and the formula used in its calculations.

Pinch-Off Voltage Formula

The following formula is used to calculate the pinch-off voltage for a MESFET:

MESFET pinch off voltage formula or equation

Where:

  • Vp = Pinch-off voltage (in volts)
  • q = Charge of an electron (1.6 x 10-19 coulombs)
  • Nd = Electron concentration (in electrons per cm-3)
  • a = Channel height (in meters)
  • εs = Permittivity of the semiconductor material (in Farads/meter), calculated as εr * ε0
    • ε0 = Permittivity of free space (8.854 x 10-12 F/m)
    • εr = Relative dielectric constant

Pinch-Off Voltage Calculator and Example

Inputs

Outputs

Let’s look at an example:

INPUTS:

  • Nd = 8E17 cm-3
  • a = 0.1 µm (0.1 x 10-6 m)
  • Er = 13.10

OUTPUTS:

  • Vp = 5.517 volts