View 2sc4270 datasheet:

Ordering number:EN2971NPN Epitaxial Planar Silicon Transistor2SC4270UHF Converter,Local Oscillator ApplicationsFeatures Package Dimensions Small noise figure : NF=3.0dB typ (f=0.9GHz)unit:mm High power gain : PG=12dB typ (f=0.9GHz)2018B High cutoff frequency : fT=3.0GHz typ[2SC4270]0.40.1630~0.11 0.95 20.951.92.91 : Base2 : Emitter3 : CollectorSANYO : CPSpecificationsAbsolute Maximum Ratings at Ta = 25CParameter Symbol Conditions Ratings UnitCollector-to-Base Voltage VCBO 25 VCollector-to-Emitter Voltage VCEO 15 VEmitter-to-Base Voltage VEBO 3 VCollector Current IC 50 mABase Current IB 20 mACollector Dissipation PC 250 mWJunction Temperature Tj 150CStorage Temperature Tstg 55 to +150CElectrical Characteristics at Ta = 25CRatingsParameter Symbol Conditions Unitmin typ maxCollector Cuto

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