View 2sc4540 datasheet:

2SC4540 TOSHIBA Transistor Silicon NPN Epitaxial Type (PCT process) 2SC4540 Power Amplifier Applications Unit: mm Power Switching Applications • Low saturation voltage: VCE (sat) = 0.5 V (max) (I = 500 mA) C • High speed switching time: t = 0.4 µs (typ.) stg • Small flat package • PC = 1.0 to 2.0 W (mounted on ceramic substrate) • Complementary to 2SA1735 Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Collector-base voltage VCBO 80 V Collector-emitter voltage VCEO 50 V Emitter-base voltage VEBO 6 V Collector current IC 1 A Base current IB 0.2 A JEDEC ? Collector power dissipation PC 500 mW PC JEITA SC-62 Collector power dissipation 1000 mW (Note) TOSHIBA 2-5K1A Junction temperature Tj 150 °C Weight: 0.05 g (typ.) Storage temperat