5V fixed output — the BOM anchor for precision rails
The REF02CSA+T is a 5V fixed-output series voltage reference from Analog Devices' REF02 family. It accepts an input from 8V to 30V and delivers a regulated 5V at up to 21 mA output current — enough to bias multiple ADC reference inputs or a small analog front-end without an extra buffer. For a 10°C shift, the output moves about 3.25 mV — a factor to consider when the ADC full-scale error budget is tight.
12 µVp-p low-frequency noise floor
A 16-bit ADC with a 5V reference sees about 76 µV per LSB; the reference's own noise consumes roughly 16% of that budget before the ADC's noise is added. For 18-bit or higher systems, external filtering or a lower-noise reference is worth evaluating. The 1.6 mA quiescent supply current is modest — the reference's own draw adds to the system power budget but stays well below the 21 mA output ceiling, so the load current dominates total consumption in most designs.
Active lifecycle — no last-time-buy pressure
ROHS3 compliance covers global regulatory requirements for lead-free assembly. The 8-SOIC package is a standard JEDEC outline — the 0.154-inch body width and 3.90 mm footprint match the industry-common SOIC-8 land pattern, so no board respin is needed when swapping between qualified suppliers.
Sourcing and availability
Tape & Reel packaging supports automated pick-and-place; Cut Tape quantities are also available for prototyping runs.