300 kHz bandwidth, 4.5 µA supply — the battery-life tradeoff
The MAX40006AUT+T is a single-channel CMOS operational amplifier from Analog Devices, packing a 300 kHz -3dB bandwidth while drawing just 4.5 µA supply current. That supply-current figure is the headline for any battery-powered or loop-powered sensor node — the amplifier's own draw is lower than most microcontrollers' sleep current, so it can stay powered continuously in a 4-20 mA transmitter or a lithium-cell monitor without draining the rail. The 0.14 V/µs slew rate and rail-to-rail output mean this isn't a high-speed part — it's sized for DC and low-frequency signals like temperature, pressure, or strain-gauge conditioning where the bandwidth ceiling is well above the signal content. The 1 pA input bias current and 200 µV input offset make it a credible front-end for high-impedance sensors without the leakage errors a bipolar input would introduce.
The supply range from 1.7 V up to 5.5 V means the same part runs off a single Li-ion cell (3.0-4.2 V), a 3.3 V logic rail, or a 5 V industrial supply — no dual supplies needed. Output current is rated 15 mA per channel — enough to drive a typical SAR ADC reference input or a small analog multiplexer, but not a heavy load like a relay coil or a 50-ohm cable. The CMOS input stage keeps the bias current at 1 pA typical, so a 10 MΩ source impedance drops only 10 µV of offset error — negligible for a 200 µV offset amplifier.
SOT-23-6 package, Tape & Reel — board-fit and procurement
Housed in a SOT-23-6 (also designated SOT-6) surface-mount package, the MAX40006AUT+T occupies about 3 mm × 3 mm of board area — a compact footprint for space-constrained designs like handheld instruments or sensor modules. The Tape & Reel (TR) and Cut Tape (CT) packaging options cover both volume production and prototype quantities. ROHS3 compliance is confirmed, so no RoHS exemption paperwork is needed for EU or global shipments.