2SA1742-L 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: -7 A
• Collector Dissipation: 30 W
• DC Current Gain (h_fe): 150 to 300
• Transition Frequency, min: 40 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 2SA1742-L transistor can have a current gain of 150 to 300. The gain of the 2SA1742 will be in the range from 100 to 400, for the 2SA1742-K it will be in the range from 200 to 400, for the 2SA1742-M it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SA1742-L might only be marked "A1742-L".The complementary NPN transistor to the 2SA1742-L is the 2SC4550-L.You can replace the 2SA1742-L with the 2SA1743, 2SA1743-L, 2SA1744, 2SA1744-L, BD204, BD304, BD536, BD538, BD544A, BD544B, BD544C, BD546A, BD546B, BD546C, BD798, BD800, BD802, BD808, BD810, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, BDX78, D45H11, D45H11FP, D45H8, MJE15029 or MJE15029G.