ADR439ARMZ-REEL7

Overview

The ADR439ARMZ-REEL7 is an XFET voltage reference from Analog Devices, providing a nominal output of 4.5 V with a maximum operating input voltage of 18 V. It features low noise performance and high accuracy, available in A Grade (±0.12% initial accuracy, 10 ppm/°C temperature coefficient) and B Grade (±0.04% initial accuracy, 3 ppm/°C temperature coefficient). The device operates over an extended industrial temperature range of −40°C to +125°C, consumes 800 µA quiescent current, and supports source currents up to 30 mA and sink currents up to 20 mA.

Feature Summary

• Utilizes patented XFET technology for exceptionally low noise and minimized thermal drift curvature.
• Offers high output drive capability with the ability to source up to 30 mA and sink up to 20 mA.
• Includes a dedicated trim terminal allowing for precise output voltage adjustment without compromising performance.
• Requires no external compensation capacitor for stability under standard loading conditions.

Applications

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

Procurement Notes

Verify the specific grade suffix (A or B) required for your application's accuracy and temperature coefficient specifications before ordering. Confirm that the REEL7 packaging format aligns with your automated assembly equipment capabilities. Ensure the input voltage supply meets the minimum headroom requirements relative to the 4.5 V output to maintain regulation.

Selection Notes

Select this component when a stable 4.5 V reference is needed with low noise characteristics suitable for sensitive analog circuits. Consider the B Grade variant if tighter initial accuracy and lower temperature drift are critical. Evaluate the power dissipation and thermal resistance if operating at higher load currents or elevated ambient temperatures.

Part Context

This part belongs to the ADR43x series of ultralow noise XFET voltage references manufactured by Analog Devices. The series includes various fixed output voltages ranging from 2.048 V to 5.000 V. The ARMZ suffix indicates an 8-lead MSOP surface-mount package, while the REEL7 designation specifies tape-and-reel packaging for high-volume manufacturing.

Replacement Considerations

Direct replacements within the same family include other ADR43x models such as ADR430, ADR431, ADR433, ADR434, and ADR435, provided the output voltage matches the system requirement. Cross-family replacements may require verification of pin compatibility and electrical parameter alignment.