BSR43 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 90 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 1.35 W
• DC Current Gain (h_fe): 100 to 300
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: SOT-89

Here is an image showing the pin diagram of this transistor.The BSR43 transistor is marked as "AR4".The complementary PNP transistor to the BSR43 is the BSR33.You can replace the BSR43 with the PBHV8115X.