The MAX4291/MAX4292/MAX4294 family of micropower operational amplifiers operates from a +1.8V to +5.5V single supply or 0.9V to 2.75V dual supplies and has Rail-to-Rail input/output capabilities. These amplifiers provide a 500kHz gain-bandwidth product and 120dB open-loop voltage gain while using only 100A of supply current per amplifier. The combination of low input offset voltage (400V) and high-open-loop gain makes them suitable for low-power/low-voltage high-precision applications.