OPAx205 Low-Power Low-Noise Precision Amplifier Texas Instruments OPAx205 Low-Power Low-Noise Precision Amplifier is the next generation of the industry-standard OPAx277 family. The device is a precision, bipolar e-trim operational amplifier with super-beta inputs. The device uses TI’s proprietary trimming technology to achieve an impressive input offset voltage of ±2µV (typical) and an input offset voltage drift of ±0.04µV (typical).