Collector-Emitter Volt (Vce): 40V Collector Current (Ic): 800mA hfe: 120-800 @ 2mA Power Dissipation (Ptot):500 mW/1.8 W Current-Gain-Bandwidth (ftotal): 300Mhz Type: NPN 2N2222A is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor’s terminals controls the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal.