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This is a LM311P, single comparator IC in an 8 pin DIP package. It's function is to compare 2 input voltages or 2 input currents, and output a digital signal indicating the highest voltage or current.
The maximum input current is 150nA, maximum offset current is 20nA, differential input voltage range is +/- 30V, supply voltage is 5V to 15V, output current is 50mA.