2SA1744-K 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: -15 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 200 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 2SA1744-K transistor can have a current gain of 200 to 400. The gain of the 2SA1744 will be in the range from 100 to 400, for the 2SA1744-L it will be in the range from 150 to 300, for the 2SA1744-M it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SA1744-K might only be marked "A1744-K".The complementary NPN transistor to the 2SA1744-K is the 2SC4552-K.You can replace the 2SA1744-K with the BD546A, BD546B, BD546C, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT88 or BDT88F.