5V reference with ±0.04% — tight enough for the ADC
The MAX6070AAUT50+T is a series voltage reference from Analog Devices that puts out a fixed 5 V with a tolerance of ±0.04%. That is tight — most general-purpose references sit at 0.1% or 0.2%, so this one buys you a full extra bit of headroom on a 12-bit ADC's full-scale error budget without trimming. It runs from a 5.2 V to 5.5 V input rail and delivers up to 10 mA, enough to bias the reference input of an ADC and a small buffer. Temperature coefficient is 6 ppm/°C, which keeps the output within a couple millivolts across the full -40°C to 125°C range. In a SOT-23-6 package, it fits on tight mixed-signal boards where every square mm counts.
Active, no end-of-life risk
The ROHS3 compliance is current. For a precision reference that might stay in a design for five or ten years, that matters: you are not chasing a drop-in replacement mid-cycle.