ADR391BUJZ-REEL7

Overview

The ADR391BUJZ-REEL7 is a micropower, low noise precision voltage reference from Analog Devices. It provides a fixed 2.5 V output with B grade initial accuracy of ±4 mV (±0.16%) and a temperature coefficient of 9 ppm/°C over the -40°C to +125°C range. The device operates on a supply voltage between 2.8 V and 15 V, drawing a maximum quiescent current of 140 μA. It features ultralow output noise of 5 μV p-p (0.1 Hz to 10 Hz) and requires no external capacitor for stability. The component includes a shutdown pin that reduces supply current to 3 μA maximum.

Feature Summary

• Patented temperature drift curvature correction techniques achieve low temperature drift in a compact TSOT package.
• Advanced design eliminates the need for external capacitors, reducing board space and system cost.
• Low dropout capability allows stable operation with a minimum supply voltage only 300 mV above the output.
• Shutdown mode feature enables significant power reduction by lowering supply current to 3 μa maximum.

Applications

• Battery-powered instrumentation
• Portable medical instrumentation
• Data acquisition systems
• Industrial process controls

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and grade specifications. Confirm availability status through authorized distributors as supply conditions may vary. Ensure the procurement channel is authorized to guarantee component authenticity and adherence to quality standards.

Selection Notes

Select this component when high precision and low power consumption are required in a small footprint. The B grade accuracy and low temperature coefficient make it suitable for applications demanding stable reference voltages across wide temperature ranges. Consider the shutdown feature for battery-operated designs requiring extended standby life.

Part Context

This part belongs to the ADR39x family of micropower, low dropout voltage references, which also includes the ADR392 and ADR395 models offering different output voltages. All members share similar architectural features, including low noise performance and the ability to operate without external capacitors. The family is designed for applications where size, power efficiency, and precision are critical constraints.

Replacement Considerations

Direct replacements within the same family include the ADR392BUJZ-REEL7 (4.096 V output) and ADR395BUJZ-REEL7 (5.0 V output). For identical 2.5 V output but lower accuracy requirements, the A-grade variant ADR391AUJZ-REEL7 is available. Verify pin compatibility and thermal characteristics when substituting.