Micropower op-amp for DC and low-frequency signal chains
The Maxim Integrated MAX406ACSA+ is a single-supply, general-purpose operational amplifier in an 8-SOIC package. Its standout feature is the 1 µA supply current, making it a fit for battery-powered instrumentation, portable medical devices, and always-on sensor front-ends where every microamp counts. The rail-to-rail output stage preserves dynamic range when running from a 2.5 V rail down to a single lithium cell, or up to 10 V for industrial sensor interfaces.
The 8 kHz gain-bandwidth product and 0.005 V/µs slew rate define this part as a DC-to-low-frequency amplifier. It handles thermocouple outputs, strain-gauge bridges, battery-voltage monitoring, and slow integrators without issue. Do not expect it to pass audio or switch-mode feedback loops above a few hundred hertz — the 1 µA bias current trade-off is real.
Supply range and input/output limits
Supply span runs from 2.5 V to 10 V. The output swings rail-to-rail under light loads; the 600 µA per-channel output current drives typical ADC inputs or reference buffers.
Housed in an 8-SOIC (3.90 mm width) with surface-mount termination. Not rated for automotive or extended industrial environments.