| .MODEL |
Most simple circuit elements typically require only a few parameter values. However, some devices (semiconductor devices in particular) that are included in SPICE require many parameter values. Often, many devices in a circuit are defined by the same set of device model parameters. For these reasons, a set of device model parameters is defined on a separate .MODEL line and assigned a unique model name. The device element lines in SPICE then refer to the model name. The general form is:
| .MODEL <model name> <model type> [<param> = <value>]* |
model name
The model name which is used to reference a particular model.
model type
Specifies the type of model. Devices can only reference models of a corresponding type. Must be one of the types outlined in the table that follows:
| Element | Description | Model type | Description |
| A | XSPICE device | XSPICE model | XSPICE code model |
| C | Capacitor | C CAP |
SPICE3 Capacitor model PSPICE Capacitor model |
| D | Diode | D | Diode model |
| L | Inductor | IND | Inductor model |
| J | JFET | PJN NJF |
P-channel JFET model N-channel JFET model |
| M | MOSFET |
PMOS NMOS |
P-channel MOSFET model N-channel MOSFET model |
| O | Lossy transmission line | LTRA | Lossy transmission line model |
| Q | BJT | PNP NPN |
PNP BJT model NPN BJT model |
| R | Resistor | R RES |
SPICE3 Resistor model PSPICE Resistor model |
| S | Voltage controlled switch | SW VSWITCH |
SPICE3 Voltage controlled switch PSPICE Voltage controlled switch |
| U | Uniform distributed RC | URC | Uniform distributed RC model |
| W | Current controlled switch | CSW ISWITCH |
SPICE3 Current controlled switch PSPICE Current controlled switch |
| X | Subcircuit model | Subcircuit name | Model defined by the user |
| Z | MESFET | PMF NMF |
P-channel MESFET model N-channel MESFET model |
param=value
Parameter values are defined by appending the parameter name followed by an equal sign and the parameter value. Model parameters that are not given a value are assigned the default values. The name must begin with an alphabetic character. The value can be a constant value or a numeric expression. The expressions must be enclosed in braces.
.MODEL QDEFAULT NPN
.MODEL QMOD PNP ( BF=80 )
.MODEL MURC URC RPERL=50 CPERL=5pF
.MODEL AMP GAIN(gain=5.0)
.MODEL NAND1 D_NAND (RISE_DELAY=0.1 FALL_DELAY=0.2)