View sts8550 datasheet:

STS8550SemiconductorSemiconductorPNP Silicon TransistorDescriptions High current application Radio in class B push-pull operationFeature Complementary pair with STS8050Ordering InformationType NO. Marking Package Code STS8550 STS8550 TO-92Outline Dimensions unit : mm3.450.14.50.12.250.10.40.022.060.11.27 Typ.2.54 Typ.1 2 3PIN Connections1. Emitter2. Base3. Collector KST-9013-000 14.50.114.00.400.381.200.1 STS8550Absolute maximum ratings (Ta=25C)Characteristic Symbol Ratings UnitCollector-Base voltage VCBO -30 VCollector-Emitter voltage VCEO -25 VEmitter-Base voltage VEBO -6 VCollector current IC -800 mAEmitter current IE 800 mACollector dissipation PC 625 mWJunction temperature Tj 150 CStorage temperature Tstg -55~150 CElectrical Characteristics

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