2SA1081 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -90 V
• Collector-Base Voltage, max: -90 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.4 W
• DC Current Gain (h_fe): 250 to 800
• Transition Frequency, min: 90 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SA1081 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 2SA1081 transistor can have a current gain of 250 to 800. The gain of the 2SA1081-D will be in the range from 250 to 500, for the 2SA1081-E it will be in the range from 400 to 800.Sometimes the "2S" prefix is not marked on the package - the 2SA1081 might only be marked "A1081".The complementary NPN transistor to the 2SA1081 is the 2SC2543.You can replace the 2SA1081 with the 2SA1082, 2SA1084, 2SA1085, 2SA1285 or 2SA1285A.