The S9015 Bipolar Transistor is a SOT-23-style package, RoHS-compliant, made by JSMSEMI. It is a 200mW, 100mA, 150MHz 300mV@100mA, 10mA +150?@(Tj) transistor with a 45V cutoff voltage. It is a type of transistor which consists of three semiconductor layers that are alternately doped with impurities to form junctions between them, allowing it to act as an electronic switch or amplifier. It is ideal for high-frequency, low-power applications such as radios or TV receivers.