Shunt voltage references anchor ADC/DAC scales, comparator thresholds and feedback networks — the foundation of the precision chain. Selection hinges on initial accuracy, temperature drift and the operating-voltage window.
Reading the Key Parameters
- Reference voltage: 2.5V and 1.25V options listed — the 1.25V class suits thresholds and feedback in low-voltage systems.
- Accuracy: graded ±0.4% / ±0.5% / ±0.8% / ±1.0% — the grade maps directly onto your system error budget.
- Temperature coefficient: roughly 20 ppm/°C (TS431H/TS432H); across wide temperature ranges, drift can outweigh initial accuracy in the total error.
- Cathode voltage range: 2.5–36V and 1.25–18V classes, setting which rails you can hang the reference on.
- Packages: SOT23-G across the listed parts — check the footprint against your assembly process.
Three Steps
- Choose 2.5V or 1.25V by supply and threshold needs;
- Split the error budget between initial accuracy and drift: pick the accuracy grade for room-temperature use, lead with ppm/°C for wide-temperature use;
- Verify the cathode-voltage window and bias design keep the device above its minimum regulation current.
Common Pitfalls
- Reading initial accuracy but not drift, then failing spec across temperature;
- Bias resistor values that starve the reference below its minimum current, losing regulation;
- Driving heavy loads directly from a shunt reference beyond its intended role.
Filter in the online parametric tool; for fit questions, submit a part-number inquiry.