Signal-chain fit for single-supply sensor front-ends
The MAX4490AXK+T is a single-circuit general-purpose op-amp from Analog Devices, packaged in a 5-lead SC-70-5 (SOT-353) footprint that fits dense mixed-signal boards where every mm² counts.
Parametric limits that govern the BOM decision
Quiescent supply current is 800 µA per amplifier, low enough for battery-powered instrumentation where every microamp is budgeted. Input bias current of 50 pA and input offset voltage of 1.5 mV are typical for a general-purpose CMOS-input stage — adequate for sensor signals above a few millivolts but not for precision microvolt-level front-ends. Output can source or sink 50 mA, enough to drive the reference input of most SAR ADCs or a small analog meter directly.
Fully RoHS3 compliant, with no exemptions that complicate EU or California market entry.
The SC-70-5 (SOT-353) package has a 0.65 mm pin pitch and a typical seated height under 1.1 mm — the footprint is small enough that a two-layer board can break out all five pins without a via. Available in Tape & Reel (TR) or Cut Tape (CT) for prototyping — the TR option suits automated pick-and-place for medium-to-high volume builds.