The MMBT3904 from Fairchild is a surface mount, NPN general purpose amplifier in SOT-23 package. This device is suitable for general purpose amplification and switching applications.
Collector to emitter voltage (Vce) of 40V
Collector to emitter saturation voltage of 300mV at 50mA collector current
Power dissipation of 350mW
DC collector current of 200mA
DC current gain of 30 at Ic=100mA
Operating junction temperature range from -55°C to 150°C