2SA1243 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -30 V
• Collector-Base Voltage, max: -30 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -3 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 70 to 240
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-252

Here is an image showing the pin diagram of this transistor.The 2SA1243 transistor can have a current gain of 70 to 240. The gain of the 2SA1243-O will be in the range from 70 to 140, for the 2SA1243-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SA1243 might only be marked "A1243".The complementary NPN transistor to the 2SA1243 is the 2SC3073.You can replace the 2SA1243 with the 2SA1244, 2SB929 or 2SB930.