2SA1078 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -120 V
• Collector-Base Voltage, max: -120 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -2 A
• Collector Dissipation: 25 W
• DC Current Gain (h_fe): 60 to 350
• Transition Frequency, min: 140 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.Sometimes the "2S" prefix is not marked on the package - the 2SA1078 might only be marked "A1078".The complementary NPN transistor to the 2SA1078 is the 2SC2528.You can replace the 2SA1078 with the 2SA1667, 2SA1668, 2SB547, BD956, BDT88, BDT88F, MJE15029, MJE15029G, MJE15031, MJE15031G, MJF15031 or MJF15031G.