20 µV offset — the precision anchor
The OPA277UA: Its headline spec is a 20 µV maximum input offset voltage, which places it firmly in the precision class for low-frequency signal conditioning — bridge sensors, thermocouple amplifiers, and precision integrators where drift and offset error dominate the budget.
Supply range and quiescent current
Rated for a supply span of 4 V to 36 V, the OPA277UA runs from a single 5 V or 24 V industrial rail, or split supplies like ±2 V to ±18 V. Quiescent current is 790 µA per amplifier — reasonable for a precision part, though not micropower. The 35 mA output current per channel can drive moderate loads like a 2 kΩ feedback network or a 100 Ω headphone, but not a relay coil or motor.