ADR121AUJZ-R2

Overview

The ADR121AUJZ-R2 is a micropower, high precision series mode band gap voltage reference manufactured by Analog Devices. It provides a fixed nominal output voltage of 2.5 V with an initial accuracy of ±0.24% (A Grade). The device features a maximum temperature coefficient of 25 ppm/°C over the extended industrial operating temperature range of −40°C to +125°C. It operates with a low typical quiescent current of 85 μA and supports a source current of up to +5 mA and a sink current of up to −2 mA. The input voltage range spans from 2.7 V to 18 V, requiring a dropout voltage of only 300 mV for stable regulation.

Feature Summary

• Patented temperature-drift curvature correction technique minimizes nonlinearities in output voltage versus temperature characteristics.
• Low dropout architecture requires minimal headroom above the nominal output voltage for stable operation.
• Integrated source and sink capability allows flexibility in driving load currents in both directions.

Applications

• Battery-powered instrumentation
• Portable medical equipment
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix R2 indicates a reel quantity of 250 units when sourcing this component. Confirm that the AUJZ designation corresponds to the RoHS-compliant 6-lead TSOT package. Ensure the A grade specification aligns with the required ±0.24% initial accuracy and 25 ppm/°C temperature coefficient for the target application environment.

Selection Notes

Select this part when a fixed 2.5 V reference with high precision is required in space-constrained designs. The low quiescent current makes it suitable for battery-operated systems where power efficiency is critical. Consider the 300 mV dropout requirement relative to the minimum available supply voltage under all load conditions.

Part Context

This component belongs to the ADR12x family of micropower LDO voltage references, which also includes the ADR125 and ADR127 variants. These devices share a common architectural design featuring band gap references with curvature correction. They are housed in the compact 6-lead TSOT (UJ-6) package, designed for surface-mount applications requiring small footprints.

Replacement Considerations

Direct functional substitutes within the same family include the ADR121BUJZ-R2, which offers higher precision with ±0.12% accuracy and a 9 ppm/°C temperature coefficient. Other variants like the ADR125 or ADR127 provide different nominal output voltages but share similar package and performance characteristics.

FAQ

What is the maximum output current capability of the ADR121AUJZ-R2?

The device can source up to +5 mA and sink up to −2 mA.

Does the ADR121AUJZ-R2 require an output capacitor for stability?

Yes, a small 0.1 μF capacitor is required on the output for stability.