ADR433AR

Overview

The ADR433AR is a precision XFET voltage reference from Analog Devices, providing a fixed 3.0 V output. It features an initial accuracy of ±0.13% (A Grade) and a maximum temperature coefficient of 10 ppm/°C. The device operates with a supply voltage range of 5.0 V to 18 V and requires a minimum headroom of 2 V. Quiescent current is typically 800 µA. It supports high output source and sink currents of +30 mA and −20 mA respectively. Noise performance is specified at 3.75 µV p-p in the 0.1 Hz to 10.0 Hz band. The component is available in 8-lead MSOP and SOIC packages.

Feature Summary

• Utilizes patented XFET technology for low noise and minimized temperature drift nonlinearity.
• Includes a dedicated trim terminal allowing output voltage adjustment over a ±0.5% range.
• Capable of sourcing up to 30 mA and sinking up to 20 mA without external components.
• Operates with low 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 the base part number may denote different accuracy levels. Confirm the package type (MSOP or SOIC) matches your PCB footprint. Ensure the input voltage stays within the 5.0 V to 18 V operating range. Check for any ordering suffixes that indicate reel packaging versus tube packaging if applicable.

Selection Notes

Select this component when a stable 3.0 V reference is needed with low noise characteristics. The ADR433AR is suitable for applications requiring moderate accuracy (±0.13%) and a wide operating temperature range. Consider the B Grade variant if tighter accuracy (±0.05%) and lower temperature coefficient (3 ppm/°C) are required. Evaluate thermal resistance if high load currents are expected.

Part Context

The ADR433AR belongs to the ADR43x family of ultralow noise XFET voltage references. This series includes variants with outputs ranging from 2.048 V to 5.000 V. All members share similar architectural benefits, including low quiescent current and high output drive capability. The family is designed to replace traditional buried Zener references in space-constrained and low-voltage applications.

Replacement Considerations

ADR433ARMZ

FAQ

How can the output voltage be adjusted?

The ADR433AR features a TRIM pin that allows the output voltage to be adjusted over a ±0.5% range without compromising performance.

What is the minimum supply voltage headroom required?

The device requires a minimum input-to-output differential voltage of 2 V to operate correctly.

Does the device require an external bypass capacitor?

No external capacitor is strictly required for stability, though a 0.1 µF capacitor at the output is recommended to improve noise suppression.