Texas Instruments' OPA189 high-precision operational amplifier is an ultra-low noise, fast-settling, zero-drift device that provides rail-to-rail output operation and features a unique MUX-friendly architecture and controlled startup system. These features and excellent AC performance, combined with only 0.4 µV of offset voltage and 0.005 µV/°C of drift over temperature, makes the OPA189 well-suited for precision instrumentation, signal measurement, and active filtering applications. Moreover, the MUX-friendly input architecture prevents inrush current when applying large input differential voltages which improves settling performance in multi-channel systems, all while providing robust ESD protection during shipment, handling, and assembly. All versions are specified from -40°C to +125°C.