The OP191/OP291/OP491 are single-supply, rail-to-rail input/output operational amplifiers from Analog Devices (ADI) that feature a single-supply operation range of 2.7 V to 12 V, wide input voltage range, rail-to-rail output swing, low supply current, wide bandwidth, low distortion, low drift, etc., and are suitable for applications such as industrial process control, battery-powered instrumentation, power supply control and protection, telecommunications, remote sensors, low voltage strain gage amplifiers, DAC output amplifiers, etc.