2SA1242-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -20 V
• Collector-Base Voltage, max: -35 V
• Emitter-Base Voltage, max: -8 V
• Collector Current − Continuous, max: -8 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 170 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-252

Here is an image showing the pin diagram of this transistor.The 2SA1242-O transistor can have a current gain of 100 to 200. The gain of the 2SA1242 will be in the range from 100 to 320, for the 2SA1242-Y it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SA1242-O might only be marked "A1242-O".You can replace the 2SA1242-O with the 2SB935, 2SB935A, 2SB936 or 2SB936A.