ADR433ARM

Overview

The ADR433ARM is a precision XFET voltage reference from Analog Devices, providing a nominal output of 3.0 V in an 8-lead MSOP package. It operates within a supply voltage range of 5.0 V to 18 V with a minimum headroom of 2 V. The device features low quiescent current of 800 µA and supports high output source and sink currents of +30 mA and −20 mA respectively. It offers initial accuracy grades of ±4 mV (A Grade) or ±1.5 mV (B Grade), with temperature coefficients of 10 ppm/°C or 3 ppm/°C. Low noise performance is achieved at 3.75 µV p-p (0.1 Hz to 10 Hz).

Feature Summary

• Utilizes patented XFET technology for minimized temperature drift nonlinearity.
• Provides high output drive capability with both sourcing and sinking functions.
• Includes an internal trim terminal for precise output voltage adjustment.
• Operates without requiring external compensation capacitors for stability.

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 accuracy needs, as the base model number does not specify it. Confirm the package type matches your PCB footprint requirements. Ensure the supply voltage meets the minimum operating threshold of 5.0 V for this specific variant. 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 A Grade version if a maximum temperature coefficient of 10 ppm/°C and initial accuracy of ±4 mV are sufficient. Choose the B Grade for tighter specifications, offering 3 ppm/°C drift and ±1.5 mV accuracy. Consider the 3.0 V output level relative to your system's ADC or comparator input ranges. Evaluate the 800 µA quiescent current against power budget constraints for battery-operated applications.

Part Context

This component belongs to the ADR43x family of ultralow noise XFET voltage references. The family includes variants with different fixed output voltages such as 2.048 V, 2.500 V, 4.096 V, 5.000 V, and 4.500 V. All members share similar architectural benefits, including low noise density and high drive current capabilities, designed to replace traditional buried Zener references in space-constrained designs.

Replacement Considerations

Direct pin-compatible replacements within the same series include ADR430, ADR431, ADR434, ADR435, and ADR439, provided the output voltage difference is acceptable for the application. Cross-family replacements like the ADR421 or ADR432 should be evaluated for thermal drift and noise characteristics.