View 2sd1277 datasheet:

Power Transistors2SD1277, 2SD1277ASilicon NPN triple diffusion planar type DarlingtonFor midium speed power switchingUnit: mm10.0 0.2 4.2 0.2Complementary to 2SB951 and 2SB951A5.5 0.2 2.7 0.2Features High foward current transfer ratio hFE 3.1 0.1 High-speed switching Full-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 0.10.8 0.1Parameter Symbol Ratings UnitCollector to 2SD1277 60VCBO V2.54 0.25base voltage 2SD1277A 805.08 0.5Collector to 2SD1277 601 2 3VCEO V1:Baseemitter voltage 2SD1277A 802:Collector3:EmitterEmitter to base voltage VEBO 7 VTO220 Full Pack Package(a)Peak collector current ICP 12 AInternal ConnectionCollector current IC 8 ACCollector power TC=25 C 45PC Wdissipation Ta=25 C 2BJu

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