3V shunt reference with ±0.1% initial accuracy
The ADR5043BKSZ-REEL7: The shunt topology means it operates like a Zener diode — it requires an external series resistor from the supply to the cathode, and the load connects across the reference and ground. The 60 µA minimum cathode current keeps the device biased; below that, the output voltage drops out of regulation. Output current capability is 15 mA, which sets the ceiling for how much load current plus the bias current the shunt can sink while maintaining regulation.
Noise floor and package fit
The 0.1-10 Hz band is the flicker-noise region that matters for DC precision — a 16-bit ADC with a 3V reference sees roughly 0.5 LSB of noise from this source alone at the low end. The wideband noise figure helps estimate the total RMS noise in the signal chain when the reference is followed by an anti-aliasing filter. Housed in an SC-70-3 (SOT-323) package, the part occupies roughly 2.0 mm × 2.1 mm of board area. The three-pin footprint — cathode, anode, and no-connect — is standard for shunt references. The Tape & Reel packaging (7-inch reel, 3000 pieces) suits automated pick-and-place assembly.