2N4239 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 5 W
• DC Current Gain (h_fe): 30 to 150
• Transition Frequency, min: 2 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.The complementary PNP transistor to the 2N4239 is the 2N4236.You can replace the 2N4239 with the 2N5320, 2N5335 or 2SC510.