2N5840 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 350 V
• Collector-Base Voltage, max: 375 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 10 to 50
• Transition Frequency, min: 5 MHz
• Operating and Storage Junction Temperature Range: -65 to +200 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.You can replace the 2N5840 with the 2N6251, 2N6513, 2N6677, 2N6678, 2SD819, 2SD820, 2SD821, 2SD822, 2SD869, 2SD870, 2SD871, BUX48, BUX48A, MJ12020, MJ12021, MJ12022, MJ13070, MJ13071, MJ16002, MJ16004, MJ16006, MJ16008, MJ8502 or MJ8504.