BDX78 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -80 V
• Collector-Base Voltage, max: -100 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -8 A
• Collector Dissipation: 60 W
• DC Current Gain (h_fe): 30
• Transition Frequency, min: 7 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The complementary NPN transistor to the BDX78 is the BDX77.You can replace the BDX78 with the 2N6041, 2N6041G, 2N6042, 2N6042G, 2N6668, 2N6668G, 2SA1077, 2SA1329, 2SA1329-O, 2SA1329-Y, 2SA1452, 2SA1452-O, 2SA1452-Y, 2SA1452A, 2SA1452A-O, 2SA1452A-Y, 2SB1228, 2SB886, 2SB951A, 2SB951A-P, 2SB951A-Q, BD538, BD538J, BD538K, BD544B, BD544C, BD546B, BD546C, BD648, BD650, BD652, BD800, BD802, BD810, BD900, BD900A, BD902, BDT62A, BDT62B, BDT62C, BDT64A, BDT64B, BDT64C, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, BDW46, BDW46G, BDW47, BDW47G, BDW48, BDW74B, BDW74C, BDW74D, BDW94B, BDW94C, BDW94CF, BDX34B, BDX34BG, BDX34C, BDX34CG, BDX34D, BDX54B, BDX54BG, BDX54C, BDX54CG, BDX54D, BDX54E, BDX54F, D45H11, D45H11FP, MJE15029, MJE15029G, MJE15031, MJE15031G, MJF15031, MJF15031G, MJF6668, MJF6668G, TIP106, TIP106G, TIP107, TIP107G, TIP136, TIP136G, TIP137, TIP137G, TIP146T, TIP147T, TTA1452B or TTB1452B.