ADR435AR

Overview

The ADR435AR is a precision series voltage reference from the Analog Devices ADR43x family, utilizing patented XFET technology to minimize temperature drift nonlinearity. It provides a fixed 5.0 V output with an initial accuracy of ±6 mV (±0.12%) for the A Grade and ±2 mV (±0.04%) for the B Grade. The device operates within a supply voltage range of 7.0 V to 18 V, requiring only 2 V of headroom. Key electrical specifications include a maximum temperature coefficient of 10 ppm/°C (A Grade) or 3 ppm/°C (B Grade), a quiescent current of 800 µA, and low noise performance of 8 µV p-p in the 0.1 Hz to 10 Hz band. It supports sourcing up to +30 mA and sinking up to -20 mA.

Feature Summary

• XFET technology minimizes voltage change versus temperature nonlinearity through patented 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 ±0.5% range.
• Operates with minimal supply voltage headroom of 2 V, 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 coefficient specifications differ between them. Confirm the package type (SOIC-8 or MSOP-8) matches your PCB footprint. Ensure the input voltage remains within the 7.0 V to 18 V operating range to maintain regulation. Check for any specific ordering suffixes that may indicate reel packaging or tape-and-reel quantities if applicable to your manufacturing process.

Selection Notes

Select the ADR435AR when a stable 5.0 V reference is needed with low noise and high accuracy. Choose the B Grade if tighter initial accuracy (±2 mV) and lower temperature drift (3 ppm/°C) are critical. Consider the ADR435ARZ variant for standard tube packaging or the REEL7 version for automated assembly. Evaluate thermal resistance requirements if operating at high load currents near the 125°C upper temperature limit.

Part Context

The ADR435AR belongs to the ADR43x series of ultralow noise XFET voltage references. This family includes variants with different fixed output voltages such as 2.048 V, 2.500 V, 3.000 V, 4.096 V, and 4.500 V. All members share the same core architecture, offering low quiescent current and high output drive capability compared to traditional buried Zener references.

Replacement Considerations

Direct functional substitutes within the same family include the ADR435ARMZ (MSOP package) or other grades like ADR435BRZ. For different voltages, consider ADR434AR (4.096 V) or ADR439AR (4.500 V). Cross-family replacements should be evaluated based on pin compatibility and noise specifications.