2SA817A-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -80 V
• Collector-Base Voltage, max: -80 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.4 A
• Collector Dissipation: 0.8 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 100 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 2SA817A-O transistor can have a current gain of 70 to 140. The gain of the 2SA817A will be in the range from 70 to 240, for the 2SA817A-Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SA817A-O might only be marked "A817A-O".The complementary NPN transistor to the 2SA817A-O is the 2SC1627A-O.The 2SA1620 (SOT-23), 2SA1620-O (SOT-23), KTA1662 (SOT-89) and KTA1662O (SOT-89) is the SMD version of the 2SA817A-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA817A-O with the 2N5401C, 2SA1013, 2SA1275, 2SA1284, 2SA1315, 2SA1315-O, 2SA984K, 2SB560, 2SB647, 2SB647A, BC640, KSA1013, KSA709C, KSA709CO, KTA1274, KTA1274O or KTA1275.