2SA743 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -4 V
• Collector Current − Continuous, max: -1 A
• Collector Dissipation: 8 W
• DC Current Gain (h_fe): 60 to 200
• Transition Frequency, min: 120 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SA743 transistor can have a current gain of 60 to 200. The gain of the 2SA743-B will be in the range from 60 to 120, for the 2SA743-C it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SA743 might only be marked "A743".The complementary NPN transistor to the 2SA743 is the 2SC1212.The 2SA1364 (SOT-89), 2SA1518 (SOT-23), 2SA1519 (SOT-23), 2SA1520 (SOT-23), 2SA1521 (SOT-23), BCP52 (SOT-223), FMMTA55 (SOT-23), KST55 (SOT-23) and MMBT4354 (SOT-23) is the SMD version of the 2SA743 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA743 with the 2SA1214, 2SA505, 2SA743A, 2SB631, 2SB744A, BD138, BD138G, BD140, BD140G, BD168, BD170, BD178, BD180, BD180G, BD190, BD229, BD231, BD236, BD236G, BD238, BD238G, BD378, BD380, BD788, BD788G, BD790, BD792, KSB744A, KSE171, KSE172, MJE171, MJE171G, MJE172, MJE172G, MJE233, MJE235, MJE250, MJE252, MJE254, MJE711 or MJE712.