2SA657A 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: -7 A
• Collector Dissipation: 50 W
• DC Current Gain (h_fe): 30 to 300
• Transition Frequency, min: 5 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SA657A might only be marked "A657A".The complementary NPN transistor to the 2SA657A is the 2SC520A.You can replace the 2SA657A with the 2SA656A, 2SA744, 2SA745, 2SA745A, 2SA746, 2SA747, 2SA747A, 2SA907, 2SA908, BD316 or BD318.