2SA817A 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 240
• 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 transistor can have a current gain of 70 to 240. The gain of the 2SA817A-O will be in the range from 70 to 140, 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 might only be marked "A817A".The complementary NPN transistor to the 2SA817A is the 2SC1627A.The 2SA1620 (SOT-23) and KTA1662 (SOT-89) is the SMD version of the 2SA817A transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA817A with the 2N5401C, 2SA1275, 2SA1284, 2SA1315, 2SA984K, 2SB560, 2SB647, KSA1013, KSA709C, KTA1274 or KTA1275.