What this single op-amp delivers
The Analog Devices MAX9943AUA+ is a single-channel general-purpose operational amplifier in an 8-uMAX/uSOP surface-mount package. It runs on a single supply from 6 V up to 38 V, making it a straightforward choice for industrial sensor interfaces, signal conditioning, and control loops that need a wide rail range without a split supply. The rail-to-rail output stage swings close to the supply rails, which helps when driving an ADC input or a low-voltage load directly.
Key ratings and what they mean for the BOM
The 2.4 MHz gain-bandwidth product and 0.35 V/µs slew rate place this part in the general-purpose band — fast enough for audio-frequency filtering, slow enough to keep noise gain under control in a 4-20 mA loop or a thermocouple amplifier. The 20 µV input offset voltage and 4 nA input bias current are typical for a precision bipolar stage; you won't need a chopper-stabilized amp unless you're after sub-µV drift. Supply current sits at 550 µA per channel, which is moderate for a 38 V-capable part — not the lowest quiescent draw, but acceptable for most panel-powered designs.
Temperature range and environment
Rated for -40°C to 125°C, the MAX9943AUA+ covers industrial enclosures, outdoor telecom cabinets, and engine-bay-adjacent electronics. The 8-uMAX/uSOP footprint (3.00 mm body width) is a common MSOP-8 land pattern, so board layout reuse across similar op-amp swaps is straightforward. The output can source or sink 20 mA per channel — enough to drive a small relay coil or an LED indicator, but not a power stage.
Lifecycle and sourcing posture
Listed as Active with ROHS3 compliance. No last-time-buy or obsolescence notice is on record. The part ships in a Tube — not Tape & Reel — so if your pick-and-place line expects a reel, factor in a tube-to-reel transfer or order a reel variant if one exists in the family.