2SA1273-O 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 200
• 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-O transistor can have a current gain of 100 to 200. The gain of the 2SA1273 will be in the range from 100 to 320, 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-O might only be marked "A1273-O".The complementary NPN transistor to the 2SA1273-O is the 2SC3205-O.The 2SA1203 (SOT-89), 2SA1203-O (SOT-89), FMMT549 (SOT-23), KTA1663 (SOT-89) and KTA1663O (SOT-89) is the SMD version of the 2SA1273-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.The KTA1273O is the TO-92 version of the 2SA1273-O.You can replace the 2SA1273-O with the 2SA1020, 2SA928A, 2SA928A-O, 2SB1229, 2SB1229-R, 2SB892, 2SB892-R, 2SB985, 2SB985R, KSA928A, KSA928A-O, KTA1273, KTA1273O, KTA1281, KTA1282, KTA1282O, STB1277 or STB1277-O.