NPN BJT and PNP BJT
The NPN BJT () and the PNP BJT () device models are large-signal models for bipolar junction transistors (BJT). It is an advanced device model and no thorough description and motivation of the many input parameters are attempted here. Many device manufacturers provide model input parameters for this BJT model. For any particular make of BJT, the device manufacturer should be the primary source of information.
Node Connections
Specify three Node names for the connection nodes for the BJT device. These represent the collector, base, and emitter nodes for the NPN transistor, and the emitter, base, and collector nodes for the PNP transistor.
Model Parameters
Specify the Model Parameters. Reasonable defaults are provided but for any particular BJT, the device manufacturer should be the primary source of information.
The interested reader is referred to Ref. 1 for more details on semiconductor modeling within circuits.
For an explanation of the Model Parameters see Bipolar Transistors.