2SA1031-D 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): 250 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-D 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-D transistor can have a current gain of 250 to 500. The gain of the 2SA1031 will be in the range from 100 to 500, for the 2SA1031-B it will be in the range from 100 to 200, for the 2SA1031-C it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SA1031-D might only be marked "A1031-D".The complementary NPN transistor to the 2SA1031-D is the 2SC458-D.The BC858 (SOT-23), BC858B (SOT-23), BC858BW (SOT-323), BC858W (SOT-323), BC859 (SOT-23), BC859B (SOT-23), BC859BW (SOT-323), BC859W (SOT-323) and BCW61C (SOT-23) is the SMD version of the 2SA1031-D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1031-D with the 2N4059, 2N4062, 2N4953, 2N4954, 2N5367, 2SA1025, 2SA1025-D, 2SA1083, 2SA1083-D, 2SA1127, 2SA1175, 2SA1246, 2SA1317, 2SA1318, 2SA1391, 2SA1392, 2SA1481, 2SA1522, 2SA1523, 2SA1524, 2SA1525, 2SA1526, 2SA1527, 2SA1528, 2SA1529, 2SA608, 2SA608N, 2SA733, 2SA990, 2SA991, 2SB1116, 2SB1229, 2SB892, 2SB985, A733, BC257, H733, KSA733C, KSB1116, KSB1116S or NTE193A.