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.
8 kHz GBW and 0.005 V/µs slew rate — what it means for your signal
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.
Package and temperature grade
Housed in an 8-SOIC (3.90 mm width) with surface-mount termination. The operating temperature range is 0°C to 70°C — commercial grade, suitable for indoor equipment, benchtop instruments, and consumer electronics. Not rated for automotive or extended industrial environments.
Lifecycle and sourcing posture
Listed as Active with ROHS3 compliance. No end-of-life notice or last-time-buy window is in effect.