2N2270 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 7 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 1 W
• DC Current Gain (h_fe): 50 to 200
• 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 2N2270 with the 2N5321, BC141 or BC441.