The OPA404 is a high performance monolithic Difet®(dielectrically-isolated FET) quad operational amplifier. It offers an unusual combination of very- low bias current together with wide bandwidth and fast slew rate. Noise, bias current, voltage offset, drift, and speed are superior to BIFET® amplifiers. Laser-trimming of thin-film resistors gives very low offset and drift—the best available in a quad FET op amp. The OPA404's input cascode design allows high pre- cision input specifications and uncompromised high- speed performance. Standard quad op amp pin configuration allows up- grading of existing designs to higher performance levels. The OPA404 is unity-gain stable.