2SA1009 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -350 V
• Collector-Base Voltage, max: -350 V
• Emitter-Base Voltage, max: -7 V
• Collector Current − Continuous, max: -2 A
• Collector Dissipation: 15 W
• DC Current Gain (h_fe): 20 to 200
• 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 2SA1009 transistor can have a current gain of 20 to 200. The gain of the 2SA1009-H will be in the range from 100 to 200, for the 2SA1009-J it will be in the range from 60 to 120, for the 2SA1009-K it will be in the range from 40 to 80, for the 2SA1009-L it will be in the range from 30 to 60, for the 2SA1009-M it will be in the range from 20 to 40.Sometimes the "2S" prefix is not marked on the package - the 2SA1009 might only be marked "A1009".You can replace the 2SA1009 with the 2SA1009A, MJE5851, MJE5851G, MJE5852 or MJE5852G.