The S9015-H is an NPN transistor that is manufactured by Yangjie. It is a SOT-23 RoHS compliant device, which is commonly used for signal amplification or switching applications. The device has three terminals, the base, collector, and emitter, and operates with a maximum current of 300mA and a maximum voltage rating of 40V. The transistor also features a low noise level of 92dB and a high gain rate of 300 for enhanced performance. This part is ideal for applications such as switching, amplifier circuits, digital communication, and other applications where intense switching is involved.