The 2SD874A is a NPN transistor housed in a SOT-89 RoHS package, and it is manufactured by the company Shikues. It is typically used as an amplification or switching device for various circuits. Its main components include a medium-power NPN transistor core, three pins, and a built-in protection diode. The three pins are the Collector, Base, and Emitter pins, and the Collector-Base Voltage is rated at up to 30V. The maximum Collector-Emitter Voltage is up to 20V, and the Collector current is rated at up to 1.8A. The maximum collector dissipation is up to 3W, and the maximum transition frequency is up to 250 MHz. It has a high DC current gain of up to 300, and it can operate in temperatures ranging from -55°C to 150°C.