The 2N5550 is a silicon NPN transistor made by Luguang. It is designed for high current, medium power, linear and switching applications, such as audio amplifiers, switching power supplies and computer/instrumentation power control.
The device features a low voltage collector-emitter breakdown voltage, and can handle collector currents up to 4A. Its maximum power dissipation is 11.5 watts at a junction temperature of 25°C. It has a minimum ß of 60 to allow for class-A, class-B and class-AB amplifiers. The device also has ECOPACK options, which can dispose of the heat efficiently.