2SA1243-Y 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): 120 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-Y transistor can have a current gain of 120 to 240. The gain of the 2SA1243 will be in the range from 70 to 240, for the 2SA1243-O it will be in the range from 70 to 140.Sometimes the "2S" prefix is not marked on the package - the 2SA1243-Y might only be marked "A1243-Y".The complementary NPN transistor to the 2SA1243-Y is the 2SC3073-Y.The 2SA1203 (SOT-89) and KTA1663 (SOT-89) is the SMD version of the 2SA1243-Y transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1243-Y with the 2SA1244, 2SA1244-Y, 2SB929, 2SB929-P, 2SB930, 2SB930-P, 2SB935A, 2SB936A, KTA1040D or KTA1046.