2N4237 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 40 V
• Collector-Base Voltage, max: 40 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 2N4237 is the 2N4234.You can replace the 2N4237 with the 2N4238, 2N4239, 2N5334, 2N5335 or 2SC512.