ADR121BUJZ-REEL7

Overview

The ADR121BUJZ-REEL7 is a micropower, high precision series mode band gap voltage reference manufactured by Analog Devices Inc. It provides a nominal output voltage of 2.5 V with B grade initial accuracy of ±0.12% and a maximum temperature coefficient of 9 ppm/°C over the −40°C to +125°C range. The device features low dropout performance requiring only 300 mV above the output voltage for regulation. It supports a source current of up to +5 mA and a sink current of up to −2 mA while maintaining a typical operating current of 85 μA. Input voltage ranges from 2.8 V to 18 V.

Feature Summary

• Patented temperature-drift curvature correction technique minimizes nonlinearities in output voltage versus temperature characteristics.
• Low dropout architecture requires minimal headroom (300 mV) above the nominal output voltage for stable operation.
• Micropower design delivers high precision with low quiescent current consumption suitable for battery-powered applications.
• Integrated sink and source capability allows flexible load interfacing without external buffering components.

Applications

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

Procurement Notes

Verify the specific ordering suffix REEL7 corresponds to the required reel packaging quantity when sourcing. Confirm RoHS compliance status as indicated in the manufacturer's documentation. Ensure the input supply voltage remains within the specified 2.8 V to 18 V range to maintain regulatory performance. Check for any regional distribution restrictions or limited availability notices associated with this specific part number variant.

Selection Notes

Select the ADR121BUJZ-REEL7 when a 2.5 V reference with B grade accuracy is required in a compact TSOT package. Consider the 300 mV dropout requirement against the minimum available supply voltage in the application. Evaluate the 85 μA quiescent current impact on total system power budget. Verify that the ±5 mA source and −2 mA sink currents meet the load drive requirements without additional amplification.

Part Context

This component belongs to the ADR12x family of precision micropower LDO voltage references, which also includes the ADR125 (5 V) and ADR127 (1.25 V) variants. All members share the same tiny 6-lead TSOT (UJ-6) package and similar architectural features including curvature correction. The family is designed for low supply voltage and low power applications requiring high stability across extended industrial temperature ranges.

Replacement Considerations

Direct functional substitutes within the same family include the ADR125BUJZ-REEL7 and ADR127BUJZ-REEL7, though these provide different nominal output voltages (5 V and 1.25 V respectively). No other direct pin-compatible replacements with identical 2.5 V output are documented in the provided datasheet.