ADR125AUJZ-R2

Overview

The ADR125AUJZ-R2 is a micropower, high precision series mode band gap voltage reference manufactured by Analog Devices Inc. It provides a nominal output voltage of 5.0 V with an initial accuracy of ±0.24% (A Grade) and a maximum temperature coefficient of 25 ppm/°C. The device operates within an input voltage range of 5.3 V to 18 V and features a low dropout characteristic of 300 mV at 5 mA load current. Quiescent current ranges from 80 μA to 125 μA depending on input voltage and temperature. It supports a source current up to +5 mA and sink current up to -2 mA. The component is housed in a 6-lead TSOT (UJ-6) surface-mount package and functions reliably across an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Features patented temperature-drift curvature correction technique to minimize nonlinearities in output voltage versus temperature characteristics.
• Provides both sourcing (+5 mA) and sinking (-2 mA) capability for flexible circuit integration.
• Designed as a low dropout voltage reference requiring minimal headroom above the nominal output voltage.

Applications

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

Procurement Notes

Verify the specific grade (A or B) and packaging suffix when ordering, as these determine accuracy and temperature coefficient specifications. Confirm that the input voltage supply meets the minimum dropout requirements for the intended load current. Ensure thermal dissipation limits are respected in high ambient temperature environments to maintain long-term stability and prevent premature failure.

Selection Notes

Select this component when a stable 5.0 V reference is required in space-constrained designs utilizing the TSOT package. Consider the A grade specifications if tighter tolerance and higher temperature stability are necessary compared to the B grade variant. Evaluate the quiescent current consumption against battery life requirements, noting that lower input voltages reduce power draw.

Part Context

This part belongs to the ADR12x family of micropower LDO voltage references, which includes the ADR121 (2.5 V) and ADR127 (1.25 V) variants. All members share similar architectural features, including low dropout performance and micropower operation, but differ in nominal output voltage and specific input voltage requirements. The family is designed for applications demanding high precision in low-power environments.

Replacement Considerations

Direct functional substitutes within the same family include the ADR121AUJZ-R2 and ADR127AUJZ-R2, though their output voltages differ. Cross-family replacements require matching output voltage, accuracy, and package dimensions. Verify pinout compatibility and thermal characteristics before substituting with other manufacturers' precision references.