The MAX4490AUK+T is a single general-purpose operational amplifier from Analog Devices, built for single-supply sensor and transducer signal chains. It delivers a 10 MHz gain-bandwidth product and a 10V/µs slew rate, which together set the usable bandwidth for amplifying fast sensor pulses or driving an ADC input. The rail-to-rail output squeezes the full dynamic range from a 2.7V to 5.5V supply — a common need in 3.3V or 5V microcontroller-based designs.
The SOT-23-5 package keeps the footprint small — useful when board space is tight, but the layout engineer should verify the pad pattern against the recommended land pattern in the datasheet.
Key parametric details for the bench
Supply current is 800 µA — low enough for battery-powered sensor interfaces without a separate low-power regulator. Input bias current is 50 pA, which keeps offset drift manageable with high-impedance sources like photodiodes or pH probes. Output current is rated at 50 mA per channel, enough to drive a small relay or an LED indicator directly. Input offset voltage is 1.5 mV — typical for a general-purpose amplifier; if the application needs sub-millivolt precision, a zero-drift amplifier would be a better fit.