The BU508A is a silicon NPN Transistor manufactured by SPTECH. It is used in a variety of applications such as voltage regulation, audio amplifiers, bipolar switching circuits, and other switching and control applications. It comes in an insulated TO-3PN packaging and is compliant with RoHS standards. The BU508A is constructed of four elements, including the collector, emitter, base, and substrate. It has low collector-emitter saturation voltage, low gate-to-source leakage, and good hFE linearity. This device provides high current gain and temperature stability. It is used in both C-MOS and TTL circuits, and is able to sustain high collector-emitter voltage. Additionally, it has excellent thermal and mechanical shock resistance.