5 V reference with ±0.05% initial tolerance — what it sets for the BOM
Noise floor and drift — the specs that decide the measurement chain
The 15 µVp-p noise from 0.1 Hz to 10 Hz sets the signal-to-noise floor for a precision ADC reference — at 5 V full-scale, that's about 3 ppm of noise, which is clean enough for a 16-bit SAR converter without post-filtering. The 6.5 ppm/°C drift means the output shifts less than 3.25 mV over the entire -55°C to 125°C span. In an avionics data-acquisition chain, that keeps the gain error within the calibration budget without a lookup table.
Supply headroom and load — sizing the rail
Input voltage range is 5.2 V to 18 V, so the REF5050MDREP needs at least 200 mV of dropout above the 5 V output. On a 5 V rail that is already 5.0 V ±5 %, the minimum input is 4.75 V — which is below the 5.2 V floor, meaning a separate 5.2 V or higher supply is required. A 12 V or 15 V analog rail is the straightforward choice. Output is rated for 10 mA continuous. That covers the reference input of most SAR ADCs (typical draw 100 µA to 1 mA) plus any external buffer or divider. If the load exceeds 10 mA, a buffer amplifier is needed.
Package and mounting — 8-SOIC footprint
Housed in an 8-SOIC (0.154-inch width, 3.90 mm body) surface-mount package. The 1.27 mm pin pitch is layout-friendly on a 2-layer board.
This part can be designed into new production without a near-term obsolescence contingency.