2N4030 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 0.8 W
• DC Current Gain (h_fe): 40 to 120
• Transition Frequency, min: 400 MHz
• Operating and Storage Junction Temperature Range: -55 to +175 °C
• Package: TO-39

Here is an image showing the pin diagram of this transistor.The BCP55 (SOT-223) and BSR40 (SOT-89) is the SMD version of the 2N4030 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N4030 with the 2N3020, 2N3108, 2N4031, 2N4238, 2N4239, 2N5320, 2N5321, 2N5334, 2N5335, 2N5336, 2N5338, 2N5681, 2N5682, 2SC510, 2SC512, BC141 or BC441.