The 2N5551 from Fairchild is a through hole, NPN general purpose amplifier in TO-92 package. This device is designed for general purpose high voltage amplifiers and gas discharge display drivers.
Collector to emitter breakdown voltage of 160V
Collector to emitter saturation voltage of 200mV at 50mA collector current
Power dissipation of 625mW
DC collector current of 600mA
DC current gain of 30 at Ic=50mA
Operating junction temperature range from -55°C to 150°C