2SA499-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -40 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 250 MHz
• Operating and Storage Junction Temperature Range: -65 to +175 °C
• Package: TO-18

Here is an image showing the pin diagram of this transistor.The 2SA499-O transistor can have a current gain of 60 to 120. The gain of the 2SA499 will be in the range from 60 to 200, for the 2SA499-Y it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SA499-O might only be marked "A499-O".The complementary NPN transistor to the 2SA499-O is the 2SC979-O.You can replace the 2SA499-O with the 2N2906, 2N2906A, 2N3250, 2N3496 or BCY70.