View 2sc4725 datasheet:

2SC4725H / 2SC4725 / 2SC4082 / 2SC3837K Transistors High-Frequency Amplifier Transistor (18V, 50mA, 1.5GHz) 2SC4725H / 2SC4725 / 2SC4082 / 2SC3837K External dimensions (Units : mm) Features 1) High transition frequency. (Typ. fT = 1.5GHz) 2SC4725H 1.6 0.85 2) Small rbb’?Cc and high gain. (Typ. 6ps) (1) 3) Small NF. (2) (3) ROHM : EMT3H (1) Emitter EIAJ : SC-89 (2) Base Absolute maximum ratings (Ta = 25°C) (3) Collector Parameter Symbol Limits Unit 2SC4725 Collector-base voltage VCBO 30 V (1) Collector-emitter voltage VCEO 18 V (2) Emitter-base voltage VEBO 3 V (3) Collector current IC 50 mA 0.8 2SC4725H,2SC4725 0.15 Collector power PC W dissipation 2SC4082,2SC3837K 0.2 1.6 Junction temperature Tj 150 °C ROHM : EMT3 (1) Emitter Storage temperature T