The OPAx277 family of precision operational amplifiers replaces the industry's popular OP-177. The OPAx277 devices offer improved noise performance, wider output voltage swing, and are twice as fast with half the quiescent current. Features include ultra-low offset voltage and temperature drift, low bias current, high common-mode rejection, and high supply rejection.

The OPAx277 achieves excellent performance from ±2V to ±18V supply voltages. Unlike most operational amplifiers, which are specified to be powered by only one supply voltage, the supply voltage of the OPAx277 series depends on the actual application; the only limitations apply to the ±5V (10V) to ±15V (30V) supply voltage range. High performance is maintained even when the amplifier swing is close to the rated limit. Since the initial offset voltage is very low (up to ±20µV), no user adjustment is normally required. However, the single-channel version (OPA277) provides an external trim pin for special applications.

The OPAx277 is easy to use and does not suffer from the phase inversion and overload problems found in some other operational amplifiers. These devices are not only gain-per-unit stable, but also provide excellent dynamic characteristics under a wide range of load conditions. The dual- and quad-channel versions have completely separate circuits to minimize crosstalk and eliminate mutual interference, even when overdriven or overloaded.