BCX54 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: 1.2 W
• DC Current Gain (h_fe): 63 to 250
• Transition Frequency, min: 130 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 BCX54 transistor can have a current gain of 63 to 250. The gain of the BCX54-10 will be in the range from 63 to 150, for the BCX54-16 it will be in the range from 100 to 250.The BCX54 transistor is marked as "BA".The complementary PNP transistor to the BCX54 is the BCX51.You can replace the BCX54 with the 2SC3444, BCX55 or BCX56.