These devices consist of four independent precision voltage comparators with an offset voltagespecifications as low as 2mV max for LM339A, LM239A and LM139A.All these comparatorswere designed specifically to operate from a single power supply aver a wide range of voltages.Operation from split power supplies is also possible. These comparators also have a unique characteristic in that the input common-mode voltage range includes ground even though operated from a single power supply voltage.
The ST LM339DT is a Very Low Supply Current Low Power Quad Voltage Comparator. It comes in a 14 pin SOIC package.