View 2sd1274 datasheet:

Power Transistors2SD1274, 2SD1274A, 2SD1274BSilicon NPN triple diffusion planar typeFor power amplificationUnit: mmFeatures 10.0 0.2 4.2 0.25.5 0.2 2.7 0.2 High collector to base voltage VCBO High-speed switching Full-pack package which can be installed to the heat sink with 3.1 0.1one screwAbsolute Maximum Ratings (TC=25C)1.3 0.2Parameter Symbol Ratings Unit 1.4 0.12SD1274 150+0.20.5 0.1Collector to0.8 0.12SD1274A VCBO 200 Vbase voltage2SD1274B 2502.54 0.252SD1274 150Collector to5.08 0.52SD1274A VCES 200 V1 2 3emitter voltage2SD1274B 250 1:Base2:CollectorCollector to emitter voltage VCEO 80 V3:EmitterTO220 Full Pack Package(a)Emitter to base voltage VEBO 6 VCollector current IC 5 ACollector power TC=25 C 40PC Wdissipation Ta=25 C 2Junction temperature Tj 150 CStorag

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