This information is part of the Modelica Standard Library maintained by the Modelica Association.

The NMOS model is a simple model of a n-channel metal-oxide semiconductor FET. It differs slightly from the device used in the SPICE simulator. For more details please care for H. Spiro.
A heating port is added for thermal electric simulation. The heating port is defined in the Modelica.Thermal library.
The model does not consider capacitances. A high drain-source resistance RDS is included to avoid numerical difficulties.

  W       L      Beta         Vt      K2     K5       DW       DL
  m       m      A/V^2        V       -      -        m        m
  12.e-6  4.e-6  0.062e-3    -4.5     0.24   0.61    -1.2e-6  -0.9e-6      depletion
  60.e-6  3.e-6  0.048e-3     0.1     0.08   0.68    -1.2e-6  -0.9e-6      enhancement
  12.e-6  4.e-6  0.0625e-3   -0.8     0.21   0.78    -1.2e-6  -0.9e-6      zero
  50.e-6  8.e-6  0.0299e-3    0.24    1.144  0.7311  -5.4e-6  -4.e-6
  20.e-6  6.e-6  0.041e-3     0.8     1.144  0.7311  -2.5e-6  -1.5e-6
  30.e-6  9.e-6  0.025e-3    -4.0     0.861  0.878   -3.4e-6  -1.74e-6
  30.e-6  5.e-6  0.031e-3     0.6     1.5    0.72     0       -3.9e-6
  50.e-6  6.e-6  0.0414e-3   -3.8     0.34   0.8     -1.6e-6  -2.e-6       depletion
  50.e-6  5.e-6  0.03e-3      0.37    0.23   0.86    -1.6e-6  -2.e-6       enhancement
  50.e-6  6.e-6  0.038e-3    -0.9     0.23   0.707   -1.6e-6  -2.e-6       zero
  20.e-6  4.e-6  0.06776e-3   0.5409  0.065  0.71    -0.8e-6  -0.2e-6
  20.e-6  4.e-6  0.06505e-3   0.6209  0.065  0.71    -0.8e-6  -0.2e-6
  20.e-6  4.e-6  0.05365e-3   0.6909  0.03   0.8     -0.3e-6  -0.2e-6
  20.e-6  4.e-6  0.05365e-3   0.4909  0.03   0.8     -0.3e-6  -0.2e-6
  12.e-6  4.e-6  0.023e-3    -4.5     0.29   0.6      0        0           depletion
  60.e-6  3.e-6  0.022e-3     0.1     0.11   0.65     0        0           enhancement
  12.e-6  4.e-6  0.038e-3    -0.8     0.33   0.6      0        0           zero
  20.e-6  6.e-6  0.022e-3     0.8     1      0.66     0        0

References:

Spiro, H.: Simulation integrierter Schaltungen. R. Oldenbourg Verlag Muenchen Wien 1990.

useHeatPort	Value: true Type: Boolean Description: =true, if heatPort is enabled
T	Value: 293.15 Type: Temperature (K) Description: Fixed device temperature if useHeatPort = false
W	Value: 20.e-6 Type: Length (m) Description: Width
L	Value: 6.e-6 Type: Length (m) Description: Length
Beta	Value: 0.041e-3 Type: Transconductance (A/V²) Description: Transconductance parameter
Vt	Value: 0.8 Type: Voltage (V) Description: Zero bias threshold voltage
K2	Value: 1.144 Type: Real Description: Bulk threshold parameter
K5	Value: 0.7311 Type: Real Description: Reduction of pinch-off region
dW	Value: -2.5e-6 Type: Length (m) Description: Narrowing of channel
dL	Value: -1.5e-6 Type: Length (m) Description: Shortening of channel
RDS	Value: 1e7 Type: Resistance (Ω) Description: Drain-Source-Resistance
Tnom	Value: 300.15 Type: Temperature (K) Description: Parameter measurement temperature
kvt	Value: -6.96e-3 Type: Real Description: Fitting parameter for Vt
kk2	Value: 6e-4 Type: Real Description: Fitting parameter for K2