The OPAx863 devices are low-power, 50‑MHz, rail-to-rail input and output (RRIO), bipolar, voltage-feedback operational amplifiers with a voltage noise density of 5.9 nV/√Hz and 1/f noise corner at 25 Hz. The OPAx863 work with a wide-supply voltage range of 2.7 V to 12.6 V, and consume only 700 μA quiescent current. The OPAx863 operate with a 2.7 V supply, are RRIO capable, consume low-power, and offer a power-down mode, which makes them great amplifiers for 3.3‑V or lower-voltage applications that require excellent ac performance. The main and auxiliary input stages of the amplifier are matched for gain bandwidth product (GBW), noise, and offset voltage and designed for applications that require wide dynamic input range and good SNR.

The device includes an overload power limit feature which limits the increase in quiescent current with over-driven and saturated outputs to either of the supply rails. For more details of this overload power limit feature, see Section 8.3.2.1. The amplifier's output is protected against short-circuit fault conditions.

The OPAx863 feature a power-down mode (PD) with a PD quiescent current of 1.5 µA (maximum) with a 3‑V supply, with turn-on and turn-off time within less than 6.5 µs.