ADR439ARZ-REEL7

Overview

The ADR439ARZ-REEL7 is an XFET voltage reference from Analog Devices, providing a nominal output of 4.5 V in an 8-lead SOIC package. It operates within a supply range of 6.5 V to 18 V with a minimum headroom of 2 V. The device features low noise (7.5 µV p-p at 0.1 Hz to 10 Hz) and high accuracy, with initial tolerances of ±5.5 mV for the A Grade and ±2 mV for the B Grade. Temperature coefficients are specified at 10 ppm/°C and 3 ppm/°C respectively. Quiescent current is 800 µA maximum, and it supports sourcing up to 30 mA and sinking up to 20 mA.

Feature Summary

• Utilizes patented XFET technology to minimize temperature drift nonlinearity
• Capable of sourcing 30 mA and sinking 20 mA without external components
• Includes a trim terminal for adjusting output voltage over a 0.5% range

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 that the system supply voltage meets the minimum operating requirement of 6.5 V. Ensure thermal management accounts for power dissipation when driving loads near the 30 mA source limit.

Selection Notes

Select this component when a 4.5 V precision reference is needed with high current drive capabilities. The ADR439 is suitable for applications requiring low noise performance in 5 V systems where buried Zener references would require excessive headroom. Consider the B Grade if tighter initial accuracy and lower temperature drift are critical.

Part Context

This part belongs to the ADR43x family of ultralow noise XFET voltage references. It shares core architectural features with models like the ADR430, ADR431, and ADR435, differing primarily in its fixed 4.5 V output voltage and corresponding 6.5 V minimum input voltage requirement. All family members utilize the same 8-lead MSOP or SOIC packages.

Replacement Considerations

ADR439ARMZ-REEL7