BUY LM139 https://www.utsource.net/itm/p/798075.html
This family of devices consists of four independent precision-voltage comparators with an offset voltage specification as low as 2 mV maximum for LM339A, LM239A, and LM139A. Each comparator has been designed specifically to operate from a single power supply over 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.
Description: Quad Differential Comparator Features: -Wide supply range: Single supply: 3V to 36V or dual supplies: ±1.5V to ±18V -Low input bias current: 25nA -High speed: 1.3μs max -Low offset voltage: 2mV max -Low offset voltage drift: 0.2mV/°C max -Low output saturation voltage: 0.2V max -Low power consumption: 0.4mW max Applications: -Linear and digital control loops -Analog switching -High speed logic systems -High speed sampling systems -High speed data acquisition systems -High speed analog-to-digital converters -High speed digital-to-analog converters (For reference only)