View 2sc4997 datasheet:

2SC4997 / 2SC4998 Transistors High-frequency Amplifier Transistor, RF switching (10V, 0.1A) 2SC4997 / 2SC4998 Features External dimensions (Units : mm) 1) High transition frequency. (fT=240MHz) 2) High hFE. 2SC4997 (1) (2) (3) 0.8 Absolute maximum ratings (Ta=25�C) 1.6 Parameter Symbol Limits Unit Collector-base voltage VCBO 15 V 0.1Min. Collector-emitter voltage VCEO 10 V ( )

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