2SA990 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 200 to 800
• Transition Frequency, min: 180 MHz
• Operating and Storage Junction Temperature Range: -55 to +125 °C
• Package: TO-92

The 2SA990 is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The 2SA990 transistor can have a current gain of 200 to 800. The gain of the 2SA990E will be in the range from 400 to 800, for the 2SA990F it will be in the range from 300 to 600, for the 2SA990P it will be in the range from 200 to 400.Sometimes the "2S" prefix is not marked on the package - the 2SA990 might only be marked "A990".The complementary NPN transistor to the 2SA990 is the 2SC1843.You can replace the 2SA990 with the 2SA1522, 2SA1523, 2SA1524, 2SA1525, 2SA1526, 2SA1527, 2SA1528, 2SA1529 or 2SA991.