View 2sd1539 datasheet:

Power Transistors2SD1539, 2SD1539ASilicon NPN epitaxial planar typeFor low-voltage switchingUnit: mmComplementary to 2SB1071 and 2SB1071A10.0 0.2 4.2 0.25.5 0.2 2.7 0.2Features Low collector to emitter saturation voltage VCE(sat) High-speed switching 3.1 0.1 Full-pack package which can be installed to the heat sink withone screwAbsolute Maximum Ratings (TC=25C)1.3 0.21.4 0.1Parameter Symbol Ratings Unit+0.20.5 0.1Collector to 2SD1539 400.8 0.1VCBO Vbase voltage 2SD1539A 502.54 0.25Collector to 2SD1539 20VCEO Vemitter voltage 2SD1539A 40 5.08 0.51 2 3Emitter to base voltage VEBO 5 V1:BasePeak collector current ICP 8 A2:Collector3:EmitterCollector current IC 4 ATO220 Full Pack Package(a)Collector power TC=25 C 25PC Wdissipation Ta=25 C 2Junction temperature Tj 150 CStorage

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