2 layers130.6 × 112 mm

Boards in 1 GitHub repository, designed in KiCad, that use the ADR381ARTZ-R2 by Analog Devices (-40℃~+85℃@(Ta) 140uA 2.5V 2.8V~18V 25ppm/℃ 5mA 5uVp-p Fixed Series ±0.24% SOT-23 Voltage Reference ROHS). See how each wires it, with its parts, size, README and files; the ADR381ARTZ-R2’s symbol, footprint and pinout are on its own page.
