2SA1031 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -30 V
• Collector-Base Voltage, max: -30 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.3 W
• DC Current Gain (h_fe): 100 to 500
• Transition Frequency, min: 230 MHz
• Noise Figure, max: 5 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SA1031 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 2SA1031 transistor can have a current gain of 100 to 500. The gain of the 2SA1031-B will be in the range from 100 to 200, for the 2SA1031-C it will be in the range from 160 to 320, for the 2SA1031-D it will be in the range from 250 to 500.Sometimes the "2S" prefix is not marked on the package - the 2SA1031 might only be marked "A1031".The complementary NPN transistor to the 2SA1031 is the 2SC458.You can replace the 2SA1031 with the 2N4059, 2N4954, 2SA1246, 2SA1317, 2SA1318, 2SA1391, 2SA1392, 2SA1481, 2SA1522, 2SA1523, 2SA1524, 2SA1525, 2SA1526, 2SA1527, 2SA1528, 2SA1529, 2SA608, 2SA733, 2SB1229, 2SB892, 2SB985, A733, H733 or KSA733C.