ADR431ARM-REEL7

Overview

The ADR431ARM-REEL7 is a precision series voltage reference from the XFET family, manufactured by Analog Devices. It provides a fixed output of 2.5 V with an initial accuracy of ±0.12% (A Grade) or ±0.04% (B Grade). The device operates within a supply voltage range of 4.5 V to 18 V and draws a quiescent current of 800 µA maximum. It features low noise performance of 3.5 µV p-p in the 0.1 Hz to 10.0 Hz band and a temperature coefficient of 10 ppm/°C for A Grade. The component supports source currents up to 30 mA and sink currents up to 20 mA, housed in an 8-lead MSOP package.

Feature Summary

• Utilizes patented XFET technology to minimize voltage change versus temperature nonlinearity.
• Capable of sourcing up to 30 mA and sinking up to 20 mA without external components.
• Includes a trim terminal allowing output voltage adjustment over a 0.5% range.
• Operates with only 2 V of supply voltage headroom, suitable for 5 V systems.

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 accuracy and temperature coefficients differ between versions. Confirm the REEL7 suffix indicates tape-and-reel packaging if automated placement is needed. Ensure the input voltage remains above 4.5 V to maintain regulation. Check for RoHS compliance status on the latest datasheet revision before finalizing procurement.

Selection Notes

Select this component when low noise and high stability are critical in space-constrained designs. The XFET architecture offers lower power consumption compared to buried Zener references. Consider the A Grade for general precision needs or B Grade for tighter tolerance requirements. The adjustable trim pin allows for system-level calibration to compensate for PCB trace resistance or other errors.

Part Context

This part belongs to the ADR43x series of ultralow noise XFET voltage references. The family includes variants with different nominal output voltages such as 2.048 V, 3.0 V, 4.096 V, and 5.0 V. All members share similar electrical characteristics regarding noise, current capability, and operating temperature range, differing primarily in their factory-trimmed output voltage levels.

Replacement Considerations

Direct substitutes within the same family include ADR430, ADR433, ADR434, and ADR435, provided the output voltage matches the design requirement. Other packages like SOIC-8 (e.g., ADR431ARZ) offer identical electrical performance but require footprint adaptation.