2SA1491-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -140 V
• Collector-Base Voltage, max: -140 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -10 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 50 to 100
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.The 2SA1491-O transistor can have a current gain of 50 to 100. The gain of the 2SA1491 will be in the range from 50 to 180, for the 2SA1491-P it will be in the range from 70 to 140, for the 2SA1491-Y it will be in the range from 90 to 180.Sometimes the "2S" prefix is not marked on the package - the 2SA1491-O might only be marked "A1491-O".The complementary NPN transistor to the 2SA1491-O is the 2SC3855-O.You can replace the 2SA1491-O with the 2SA1106, 2SA1186, 2SA1186-O, 2SA1294, 2SA1294-O, 2SA1303, 2SA1303-O, 2SA1386, 2SA1386-O, 2SA1386A, 2SA1386A-O, 2SA1386A-P, 2SA1386A-Y, 2SA1492, 2SA1492-O, 2SA1695, 2SA1695-O, 2SA2151, 2SA2151-O, 2SA2151A, 2SA2151A-O, 2SA2151A-P, 2SA2151A-Y, 2SA2223, 2SA2223-O, 2SA2223A, 2SA2223A-O, FJA4210, FJA4210R, MAG9413, MAG9413A, MJW1302A or MJW1302AG.