OPAx330 CMOS Operational Amplifiers Texas Instruments OPAx330 CMOS Operational Amplifiers (op amps) offer precision performance and an unmatched price. The OPAx330 zero-drift op amps use a proprietary auto-calibration technique to simultaneously provide low offset voltage (50µV max) and near-zero drift over time and temperature at only 35µA (max) of quiescent current.