View 2n4400 datasheet:

2N4400 MMBT4400 C E C TO-92 B B E SOT-23 Mark: 83 NPN General Purpose Amplifier This device is designed for use as general purpose amplifiers and switches requiring collector currents to 500 mA. Absolute Maximum Ratings* TA = 25°C unless otherwise noted Symbol Parameter Value Units VCEO Collector-Emitter Voltage 40 V VCBO Collector-Base Voltage 60 V VEBO Emitter-Base Voltage 6.0 V ICCollector Current - Continuous600 mA Operating and Storage Junction Temperature Range -55 to +150 TJ, Tstg °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 in