2SA1909-P 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: 80 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3PF

Here is an image showing the pin diagram of this transistor.The 2SA1909-P transistor can have a current gain of 70 to 140. The gain of the 2SA1909 will be in the range from 50 to 180, for the 2SA1909-O it will be in the range from 50 to 100, for the 2SA1909-Y it will be in the range from 90 to 180.Sometimes the "2S" prefix is not marked on the package - the 2SA1909-P might only be marked "A1909-P".The complementary NPN transistor to the 2SA1909-P is the 2SC5101-P.You can replace the 2SA1909-P with the 2SA1673, 2SA1673-P, 2SA1860, 2SA1860-P, 2SA1987, 2SB1161, FJAF4210 or FJAF4210O.