ADR431ARZ-REEL7

Overview

The ADR431ARZ-REEL7 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 ±0.12% (A Grade) and a maximum temperature coefficient of 10 ppm/°C. The device operates within a supply voltage range of 4.5 V to 18 V and draws a typical quiescent current of 800 µA. It features low noise performance of 3.5 µV p-p in the 0.1 Hz to 10.0 Hz band and supports high output source and sink currents of 30 mA and −20 mA respectively. Packaged in an 8-lead SOIC_N (R-8), it 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 sourcing up to 30 mA and sinking up to −20 mA without external components.
• Includes a dedicated trim terminal allowing output voltage adjustment over a ±5% range.
• Requires no external capacitor for stability while maintaining low noise characteristics.

Applications

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

Procurement Notes

Verify the specific grade (A or B) required for your application, as the base part number covers multiple accuracy tiers. Confirm that the REEL7 suffix matches your automated assembly equipment requirements. Ensure the input voltage remains above the minimum headroom specification relative to the 2.5 V output across all operating temperatures. Check for RoHS compliance documentation if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when low noise and high accuracy are critical for signal integrity in measurement circuits. The ADR431 variant is suitable for 5 V systems requiring a stable 2.5 V reference. Consider the A Grade specifications for standard precision applications or B Grade if tighter tolerance is needed. Evaluate the thermal resistance values if power dissipation limits are a concern in dense PCB layouts.

Part Context

This device belongs to the ADR430/ADR431/ADR433/ADR434/ADR435 series of XFET voltage references. The ADR431 specifically targets the 2.5 V output market segment. It shares architectural similarities with other members of the family but differs in nominal output voltage and minimum input voltage requirements. The series replaces older buried Zener references by offering lower supply current and reduced headroom requirements.

Replacement Considerations

Direct functional substitutes within the same family include the ADR431ARMZ for MSOP packaging or the ADR431AR for tube packaging. Cross-family replacements like the ADR36xx series offer different current capabilities but may require circuit adjustments due to varying pinouts or noise profiles.