BCP54 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 45 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 1.5 W
• DC Current Gain (h_fe): 40 to 250
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-223

Here is an image showing the pin diagram of this transistor.The BCP54 transistor is marked as "BCP54".The complementary PNP transistor to the BCP54 is the BCP51.You can replace the BCP54 with the BCP55, BCP56 or BDP951.