ADR121AUJZ-REEL7

Overview

The ADR121AUJZ-REEL7 is a micropower, high precision series mode band gap voltage reference from Analog Devices. It provides a nominal output voltage of 2.5 V with an initial accuracy of ±0.24% and a maximum temperature coefficient of 25 ppm/°C. The device operates within an input range of 2.7 V to 18 V and features a low dropout voltage of 300 mV. It draws a typical quiescent current of 85 μA and supports an output current capability of +5 mA source and −2 mA sink. The component is housed in a tiny 6-lead TSOT (UJ-6) package and functions reliably across an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Incorporates patented temperature-drift curvature correction technique to minimize nonlinearities in output voltage versus temperature characteristics.
• Features low dropout performance requiring only 300 mV headroom above the nominal output voltage for stable operation.
• Provides both source and sink current capabilities to support dynamic load conditions efficiently.
• Designed for micropower applications with low typical operating current suitable for battery-powered systems.

Applications

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

Procurement Notes

Verify the specific grade and package option when ordering, as the AUJZ suffix indicates the A-grade accuracy and UJ-6 package. Confirm RoHS compliance status if required by your manufacturing standards. Ensure the reel quantity matches your production needs, as this part is typically supplied in reels of 3,000 units. Cross-reference the datasheet revision to ensure compatibility with your design specifications.

Selection Notes

Select the ADR121AUJZ-REEL7 when a 2.5 V reference with ±0.24% initial accuracy is required. Consider this part for designs where low power consumption is critical due to its 85 μA quiescent current. The low dropout characteristic makes it suitable for applications with limited input voltage headroom. Verify that the thermal resistance of the UJ-6 package meets your power dissipation requirements under maximum load conditions.

Part Context

This component belongs to the ADR12x family of precision voltage references, which includes the ADR125 and ADR127 variants offering different output voltages. All members share similar architectural features, including micropower operation and the tiny TSOT package. The ADR121 specifically targets the 2.5 V reference market segment, complementing the 5 V and 1.25 V options provided by its siblings in the same product line.

Replacement Considerations

Direct functional substitutes within the same family include the ADR121BUJZ-REEL7, which offers higher accuracy (±0.12%) and lower temperature coefficient (9 ppm/°C). Other parts in the ADR12x series may be considered if different output voltages are acceptable. Ensure pinout compatibility and thermal characteristics match when substituting with other manufacturers' precision references.