2N3020 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 140 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 0.8 W
• DC Current Gain (h_fe): 40 to 120
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -65 to +200 °C
• Package: TO-39

Here is an image showing the pin diagram of this transistor.You can replace the 2N3020 with the 2N4031, 2N4239, 2N5320, 2N5335, 2N5336, 2N5338, 2N5681, 2N5682 or 2SC510.