2SA1291-Q Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -80 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -10 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SA1291-Q transistor can have a current gain of 70 to 140. The gain of the 2SA1291 will be in the range from 70 to 280, for the 2SA1291-R it will be in the range from 100 to 200, for the 2SA1291-S it will be in the range from 140 to 280.Sometimes the "2S" prefix is not marked on the package - the 2SA1291-Q might only be marked "A1291-Q".The complementary NPN transistor to the 2SA1291-Q is the 2SC3255-Q.You can replace the 2SA1291-Q with the 2N6490, 2N6490G, 2N6491, 2N6491G, 2SA1077, 2SA1329, 2SA1329-O, 2SA1452, 2SA1452-O, 2SA1452A, 2SA1452A-O, 2SA1471, 2SA1471-Q, BD546A, BD546B, BD546C, BD708, BD710, BD712, BD744A, BD744B, BD744C, BD808, BD810, BD908, BD910, BD912, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, BDT92, BDT92F, BDT94, BDT94F, BDT96, BDT96F, D45H11, D45H11FP or D45H8.