ADR431BRZ

Overview

The ADR431BRZ is a precision series voltage reference from the XFET family, manufactured by Analog Devices Inc. It provides a fixed output voltage of 2.500 V with an initial accuracy of ±0.04% (±1 mV) and a maximum temperature coefficient of 3 ppm/°C. The device operates within a supply voltage range of 4.5 V to 18 V, requiring only 2 V of headroom. It features low noise performance of 3.5 µV p-p in the 0.1 Hz to 10.0 Hz band and draws a quiescent current of 800 µA maximum. The component supports sourcing up to 30 mA and sinking up to -20 mA of load current. It is housed in an 8-lead SOIC package and functions over an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Utilizes XFET technology for ultralow noise and minimal temperature drift curvature correction.
• Capable of both sourcing 30 mA and sinking 20 mA output currents without external components.
• Includes a dedicated trim terminal allowing output voltage adjustment over a ±5% range.
• Requires no external bypass capacitor for stable operation under standard conditions.

Applications

• Precision data acquisition systems
• High resolution data converters
• Medical instruments
• Industrial process control systems

Procurement Notes

Verify that the specific part number matches the required B-grade specifications for tight tolerance applications. Confirm the package type corresponds to the narrow SOIC variant rather than MSOP. Ensure the revision level aligns with design requirements regarding pinout definitions and electrical characteristics. Cross-reference ordering suffixes if reel packaging is necessary for automated assembly processes.

Selection Notes

Select this component when a fixed 2.5 V reference with high accuracy and low noise is required. The B-grade specification ensures superior temperature stability compared to the A-grade alternative. Consider the 2 V minimum headroom requirement relative to the system supply voltage. Evaluate the need for current sink capability if driving capacitive loads or bidirectional circuits.

Part Context

This component belongs to the ADR43x series of XFET voltage references, which includes models with outputs ranging from 2.048 V to 5.000 V. The series shares common architectural features such as low quiescent current and high ripple rejection ratios. The ADR431 specifically targets applications needing a 2.5 V reference point, distinguishing itself from adjacent models like the ADR430 or ADR433 through its specific output voltage setting.

Replacement Considerations

ADR431ARZ

FAQ

What is the function of Pin 7 (COMP)?

Pin 7 serves as the compensation input. Connecting a series resistor and capacitor network from COMP to VOUT reduces overall noise performance.

Does the ADR431BRZ require an external capacitor?

No external capacitor is required for basic operation, although adding a bypass capacitor can improve line transient response.