The MAX4040EUK is a single general-purpose op-amp from Maxim Integrated in a SOT-23-5 package, designed for low-power, single-supply applications. Its 90 kHz gain-bandwidth product and 0.04 V/µs slew rate limit it to DC and low-frequency signals — think sensor conditioning, battery monitoring, or reference buffering, not audio or high-speed control loops.
14 µA supply current and 2 nA input bias — sizing for battery and high-impedance circuits
Quiescent supply current is just 14 µA, making this op-amp a fit for always-on or battery-powered designs where every microamp matters. The 2 nA input bias current is low enough for most resistive sensor bridges and photodiode amplifiers without excessive voltage offset from source impedance.
2.5 mA output current — what it can and cannot drive
Each channel can source or sink 2.5 mA. That drives the input of an ADC, a comparator, or a logic gate directly, but not a relay coil, a headphone, or a long cable. Plan on a buffer stage if the load impedance is below about 2 kΩ at 5 V supply.