The BZX85C39-TAP is a PNP type silicon epitaxial transistor manufactured by Vishay. It has a maximum current rating of 200mA and a maximum voltage rating of 45V. It is typically used as a switch or amplifier in applications such as LED drivers, audio amplifiers, and communication systems. It has a gain value of 180-400 depending on the operating conditions and a typical beta of 300. This device is available in a variety of packages, including the TO-92-3 mechanical dimensions, or SC-79 with larger dimensions.