View 2n5551 datasheet:

2N5551 MMBT5551 C E C TO-92 B B E SOT-23 Mark: 3S NPN General Purpose Amplifier This device is designed for general purpose high voltage amplifiers and gas discharge display drivers. Absolute Maximum Ratings* TA = 25°C unless otherwise noted Symbol Parameter Value Units VCEO Collector-Emitter Voltage 160 V VCBO Collector-Base Voltage 180 V VEBO Emitter-Base Voltage 6.0 V IC Collector Current - Continuous 600 mA -55 to +150 TJ, Tstg Operating and Storage Junction Temperature Range °C *These ratings are limiting values above which the serviceability of any semiconductor device may be impaired. NOTES: 1) These ratings are based on a maximum junction temperature of 150 degrees C. 2) These are steady state limits. The factory should be consulted on applications involving p