The MMBTA10 is a Bipolar Transistor manufactured by Semtech and designed to conform to the TO-236-3 package size. It is a NPN (negative positive negative) transistor, meaning it has three layers of semiconductor material, typically silicon, that are sandwiched together to create the transistor. This particular transistor is rated at 25V, 200mW, and 60@4mA, with 10V and 100mA ratings. It is also compliant with Rohs standards.