2SD1047NPN silicon planar transistor. This transistor is a power transistor commonly used in many models of audio amplifier output stages. It is commonly found in Rotelmodels but can be used in most domestic audio amplifiers as the NPN output device. This transistor the2SD1047normally compliments the2SB817PNP device.The transistor rating is as follows:Collector-Emitter Voltage, Vceo: 140VCollector-Base Voltage, Vcbo: 160VEmitter-Base Voltage, Vebo: 6.0VCollector Current Continuous/Peak, Ic/Icm: 12A/15APower Dissipation @ 25 Centigrade: 100WOperating Temperature Range: -55 to 150 Centigrade