2N3448 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 100 V
• Emitter-Base Voltage, max: 10 V
• Collector Current − Continuous, max: 7.5 A
• Collector Dissipation: 115 W
• DC Current Gain (h_fe): 40 to 120
• 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 2N3448 with the 2N6338, 2N6338G, 2N6339, 2N6339G, 2N6340, 2N6340G, 2N6341, 2N6341G, 2N6472, 2SC1079, 2SC1080, 2SC1115, 2SC1343, 2SC1584, 2SC2337, 2SC2337A, 2SC2431, 2SC2433, 2SD425, 2SD426, 2SD427, 2SD732, 2SD733, 2SD733K, 2SD745, 2SD745A, 2SD745B, BD315, BD317, KD503, MJ15001, MJ15001G, MJ15003 or MJ15003G.