1.25V series reference with ±0.08% tolerance for precision analog rails
The MAX6070BAUT12+T from Analog Devices is a fixed-output series voltage reference delivering 1.25V with a tight ±0.08% initial tolerance. Housed in a SOT-23-6 package, it operates from a 2.7V to 5.5V input supply and can source up to 10 mA.
Low-frequency noise is specified at 3.6 µVp-p from 0.1 Hz to 10 Hz and 2.5 µVrms from 10 Hz to 10 kHz. For a 16-bit ADC with a 1.25V reference, that noise contribution sits well below 1 LSB, so it won't limit the converter's effective resolution. The 8 ppm/°C drift translates to roughly 10 µV of output shift per degree Celsius — worth budgeting if the reference sees a 50°C swing in an outdoor telecom cabinet or engine bay.
SOT-23-6 package and supply range
The SOT-23-6 footprint is a common low-profile surface-mount package that fits tight PCB layouts without needing a dedicated thermal pad. Input voltage covers 2.7V to 5.5V, so it can run from a 3.3V or 5V rail with enough headroom for the series pass element. Quiescent supply current is 260 µA typical, which keeps the power budget lean in battery-powered or energy-harvesting designs.
It is ROHS3 compliant. The laser etch and date-code consistency should trace cleanly back to the authorized chain, so counterfeit risk is low when procured through a vetted distributor.