ADR391BUJZ-R2

Overview

The ADR391BUJZ-R2 is a micropower, low noise precision voltage reference from Analog Devices Inc., featuring a fixed 2.5 V output in a compact 5-lead TSOT package. It utilizes patented temperature drift curvature correction to achieve a B grade initial accuracy of ±4 mV maximum and a temperature coefficient of 9 ppm/°C across the −40°C to +125°C range. The device operates with a supply current of 140 μA maximum and includes a shutdown mode drawing 3 μA maximum. It supports up to 5 mA output current without requiring external capacitors.

Feature Summary

• Patented temperature drift curvature correction for high precision
• Integrated shutdown feature with ultra-low power consumption
• Capacitor-free design simplifies board layout
• Low dropout performance enables operation on minimal supply headroom

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging type and reel specifications. Confirm that the component meets all required environmental standards and RoHS compliance before integration into final designs. Ensure compatibility with existing supply chain protocols.

Selection Notes

Select this component when a stable 2.5 V reference is required in space-constrained applications. The B grade specification provides tighter accuracy limits compared to the A grade variant. Consider the shutdown capability if system power management requires active control over quiescent current consumption during idle periods.

Part Context

This part belongs to the ADR39x family of band gap voltage references, which also includes the 4.096 V ADR392 and 5.0 V ADR395 models. All variants share the same physical footprint and core architecture but differ in output voltage and specific accuracy grades. The family is designed for low-power, high-precision applications requiring minimal external components.

Replacement Considerations

ADR391AUJZ-R2 (A Grade version)

FAQ

Does the ADR391BUJZ-R2 require an external capacitor for stability?

No, the device does not require an external capacitor for circuit stability under any load condition.

What is the logic level requirement for the shutdown pin?

The shutdown pin is TTL/CMOS level compatible; a logic low or 0 V condition turns the device off.