# Bipolar Junction Transistor (VBIC with self heating)

In this topic:

## Netlist Entry

Qxxxx collector base emitter substrate thermal_node modelname
[M=multiplier] [AREA|SCALE=area]
 collector Collector node name base Base node name emitter Emitter node name substrate Substrate node name thermal_node See notes modelname Name of model. Must begin with a letter but can contain any character except whitespace and '.' . multiplier Device scale. Has an identical effect as putting multiplier devices in parallel. area Scales certain model parameters as described in the parameter table under Area column. A $\infty$ entry means the parameter is multiplied by the area while a means the parameter is divided by the area.

## Model Syntax

.MODEL modelname NPN|PNP LEVEL=1004 parameters

## Model Parameters

Model parameters are identical to the non-thermal version except for the addition of the following:

 Name Description Units Default Area RTH Thermal resistance 0.0 $\div$ CTH Thermal capacitance 0.0 $\times$

## Notes

The VBIC model is only available with Elite versions.

This model is the same as the VBIC non-thermal model except for the addition of self-heating effects. Use the non-thermal version if you do not need self-heating as its implementation is simpler and will run faster.

The thermal_node may be used to connect external thermal networks to model thermal flow. Power in watts is represented by current and temperature rise in Kelvin is represented by the voltage. Note that the voltage is temperature rise above the simulation temperature, not an absolute value.