View 2sd1273 datasheet:

Power Transistors2SD1273, 2SD1273ASilicon NPN triple diffusion planar typeFor power amplification with high forward current transfer ratioUnit: mmComplementary to 2SB129910.0 0.2 4.2 0.25.5 0.2 2.7 0.2FeaturesHigh foward current transfer ratio hFE 3.1 0.1Satisfactory linearity of foward current transfer ratio hFEFull-pack package which can be installed to the heat sink withone screw1.3 0.21.4 0.1Absolute Maximum Ratings (TC=25C)+0.20.5 0.1Parameter Symbol Ratings Unit0.8 0.1Collector to 2SD1273 80VCBO V2.54 0.25base voltage 2SD1273A 1005.08 0.5Collector to 2SD1273 60VCEO V 1 2 3emitter voltage 2SD1273A 801:BaseEmitter to base voltage VEBO 6 V 2:Collector3:EmitterPeak collector current ICP 6 ATO220 Full Pack Package(a)Collector current IC 3 ABase current IB 1 ACollector power TC=25 C

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