The OPAx397 is a unity-gain stable, precision operational amplifier family free from unexpected output and phase reversal. The use of proprietary e-trim operational amplifier technology gives the benefit of low input offset voltage over time and temperature, along with ultra-low input bias current. The OPAx397 are optimized for full rail-to-rail input, allowing for low-voltage, single-supply operation or split-supply use. These miniature, high-precision, low-noise amplifiers offer high-impedance inputs that have a common-mode range to the supply rail, with low offset across the supply range, and a rail-to-rail output that swings within 5 mV of the supplies under normal test conditions. The OPAx397 precision amplifiers are designed for upstream analog signal chain applications in low or high gains, as well as downstream signal chain functions such as DAC buffering.