Digital BJT - Pre-Biased

A digital bipolar junction transistor (BJT) is very similar to a general purpose BJT, except that it is intended for use specifically as a voltage or current controlled switch.  Often, a digital BJT has biasing resistors built into the package for easy integration into a circuit providing a reduced component count.  Digital BJTs are available as single NPN, PNP, or in combo packages with two or more devices in various configurations.  Although metal oxide silicon field effect transistors (MOSFETs) are more commonly used in digital applications, a digital BJT may be preferred in some specialty circuits.  For example, an application that is very sensitive to switching noise may be better suited to a digital BJT, which has an inherently slower switching rate.