The document describes the features and characteristics of the Quad Low Offset, Low Power Operational Amplifier OP400 Rev. E, including low input offset voltage, low offset voltage drift over –55°C to +125°C, low supply current, high open-loop gain, input bias current, low noise voltage density, etc. The product is pin-compatible with LM148, HA4741, RM4156, and LT1014, with improved performance.