2SA1743 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -100 V
• Emitter-Base Voltage, max: -7 V
• Collector Current − Continuous, max: -10 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 100 to 400
• Transition Frequency, min: 80 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.The 2SA1743 transistor can have a current gain of 100 to 400. The gain of the 2SA1743-K will be in the range from 200 to 400, for the 2SA1743-L it will be in the range from 150 to 300, for the 2SA1743-M it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SA1743 might only be marked "A1743".The complementary NPN transistor to the 2SA1743 is the 2SC4551.You can replace the 2SA1743 with the 2SA1744, BD546A, BD546B, BD546C, BD808, BD810, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, D45H11, D45H11FP or D45H8.