OPAx863 Low Power High-Speed Op Amps Texas Instruments OPAx863 Low Power High-Speed Operational Amplifiers (Op Amps) are unity-gain stable, rail-to-rail input or output, voltage-feedback operational amplifiers. They are designed to operate over a power supply range of 2.7V to 12.6V. Consuming only 700µA per channel, the OPAx863 devices offer a gain-bandwidth product of 50MHz, a slew rate of 105V/µs, with a voltage noise density of 5.9nV/√Hz.