The S9013-MS SOT-23 Bipolar Transistor with ROHS manufactured by MSKSEMI is a BJT (Bipolar Junction Transistor). These BJTs are typically used as small signal amplifiers and switches. They feature a low collector-emitter saturation voltage, high current gain, and fast switching speeds. The package is a SOT-23 (Surface-Mounted Transistor), which enables it to be mounted on a PCB (printed-circuit board). The device also has ROHS compliance, meaning it meets restrictions on hazardous substances as outlined by European Union legislation.