BCP51 Bipolar Transistor

• Type: PNP
• 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: 125 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 BCP51 transistor is marked as "BCP51".The complementary NPN transistor to the BCP51 is the BCP54.You can replace the BCP51 with the BCP52, BCP53 or BDP952.