Transistor Type: NPN Collector ? base voltage: 45V Collector voltage of the transmitter: 50V Base voltage of the transmitter: 6V Epitaxial silicon NPN transistor. It is designed to be used as a general-purpose amplifier switches requiring collector current of the transistor 500 mA. Transistor is about 0.7 inches in length and 0.1cm in width. Collector Current: 0.5A Power loss: 625mW Storage temperature: -55¡æ~150 ¡æ Package: TO-92 Total size: about 0.7 x0.1 inch Pin Size: about 0.5 x 0.1 inch