2SA1273 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: -2 A
• Collector Dissipation: 1 W
• DC Current Gain (h_fe): 100 to 320
• Transition Frequency, min: 120 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.The 2SA1273 transistor can have a current gain of 100 to 320. The gain of the 2SA1273 will be in the range from 100 to 320, for the 2SA1273-O it will be in the range from 100 to 200, for the 2SA1273-Y it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SA1273 might only be marked "A1273".The complementary NPN transistor to the 2SA1273 is the 2SC3205.The 2SA1203 (SOT-89), FMMT549 (SOT-23) and KTA1663 (SOT-89) is the SMD version of the 2SA1273 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.The KTA1273 is the TO-92 version of the 2SA1273.You can replace the 2SA1273 with the 2SA928A, 2SB1229, 2SB892, 2SB985, KSA928A, KTA1273, KTA1282 or STB1277.