View sts9018 datasheet:

STS9018NPN Silicon TransistorDescription PIN Connection High frequency low noise amplifier application C VHF band amplifier application BFeatures Low noise figure : NF = 4dB(Max.) at f=100MHz High transition frequency fT = 800MHz(Typ.) E TO-92 Ordering Information Type NO. Marking Package Code STS9018 STS9018 TO-92 Absolute maximum ratings Ta=25C Characteristic Symbol Ratings UnitCollector-Base voltage VCBO 40 VCollector-Emitter voltage VCEO 30 VEmitter-Base voltage VEBO 4 VCollector current IC 20 mAEmitter current IE -20 mACollector dissipation PC 625 mWJunction temperature Tj 150 C Storage temperature range Tstg -55~150 C Electrical Characteristics Ta=25C Characteristic Symbol Test Condition Min. Typ. Max. UnitCollector cut-off current ICBO VCB=40V, IE=0 - - 0.1 A Emitter cut-off current IEBO V

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