Bipolar junction transistors (BJTs) can be operated in common base, common emitter or common collector mode. These modes have different input and output impedances and different current gains, offering individual advantages to a designer.

A transistor can be operated in its non-linear region as a current/voltage amplifier or as an electronic switch in cutoff and saturation modes. In its linear region, it must be biased appropriately (that is, subjected to external voltages to produce a desired collector current) to establish a proper DC operating point.

The Multisim database includes a number of manufacturers' BJTs, for example, 2N1132A. These are found in the various BJT families in the Transistors component group.

Refer to the BJT section of the Multisim SPICE Reference for detailed information about this device, including parameters and equations.