**ADR391AUJZ-R2: A 5V Ultra-High Precision Voltage Reference**

In the realm of precision electronics, the stability and accuracy of a voltage reference are paramount. They serve as the foundational anchor for analog-to-digital converters (ADCs), digital-to-analog converters (DACs), power supplies, and measurement equipment, directly determining system performance. The **ADR391AUJZ-R2** from Analog Devices stands out as a premier solution in this critical function, delivering **5V output with exceptional ultra-high precision**.

This voltage reference is engineered around the patented **XFET® (eXtra implanted junction Field-Effect Transistor)** architecture. This core technology provides a significant advantage over traditional bandgap or buried Zener diode references by offering **lower noise, lower power consumption, and superior long-term stability** without the requirement of an external noise-reduction capacitor. The ADR391AUJZ-R2 boasts an remarkably low initial accuracy of ±0.04% (max) and an ultra-low temperature drift of just **3 ppm/°C (max)**, ensuring consistent performance across a wide industrial temperature range (-40°C to +125°C).

Furthermore, the device features an excellent noise performance of 3.8 μVp-p (0.1 Hz to 10 Hz) and can source or sink up to 5 mA of load current, making it robust enough for a variety of real-world applications. Its low operating current of 290 μA (max) is ideal for power-sensitive and portable instrumentation. Housed in a compact 5-lead SOT-23 package, the **ADR391AUJZ-R2 provides a perfect blend of miniaturization and top-tier performance**, enabling designers to achieve higher accuracy in space-constrained designs such as data acquisition systems, medical instrumentation, precision calibrators, and high-resolution industrial sensors.

**ICGOODFIND**: The ADR391AUJZ-R2 is an exemplary voltage reference that sets a high bar for precision, combining Analog Devices' advanced XFET® technology with outstanding thermal stability and low noise in a miniature package, making it an optimal choice for the most demanding precision applications.

**Keywords**: Ultra-High Precision, Voltage Reference, XFET® Architecture, Low Temperature Drift, Low Noise