OPA378/ OPA2378 Zero-Drift Op Amps The Texas Instruments OPA378 / OPA2378 Zero-Drift operational amplifier (op amp) uses an auto-calibration technique to provide minimal input offset voltage (50µV max) and offset voltage drift (0.25µV/°C max). The TI OPA378 / OPA2378 op amp combines low input voltage noise, high gain bandwidth (900 kHz), and low power (150µA max) to achieve optimum performance for low-power precision applications. The OPA378 is the single version while the OPA2378 is the dual version. This TI op amp also provides excellent PSRR performance, a wide input supply range of 2.2V to 5.5V, and rail-to-rail input and output.