Analog Devices Inc. ADR03AUJ-R2

Overview

ADR03AUJ-R2 from Analog Devices is a precision 2.5 V band gap voltage reference IC in a 5-lead TSOT package, featuring ±0.2% initial accuracy, 9 ppm/°C max temperature coefficient (B grade), and 5 µV_p-p (0.1 Hz to 10 Hz) low-noise output. It operates from 4.5 V to 36 V input, delivers up to 10 mA, and supports industrial temperature range (−40°C to +125°C). It serves as a stable reference in high-resolution ADCs and precision sensor signal chains.

For engineers reviewing the ADR03AUJ-R2 datasheet, ADR03AUJ-R2 pinout, ADR03AUJ-R2 application, or ADR03AUJ-R2 equivalent, key selection criteria include its TSOT-5 footprint, TEMP pin for on-chip temperature monitoring (550 mV @ 25°C, 1.96 mV/°C), TRIM pin for output adjustment, dropout voltage ≤2 V, and no external capacitor requirement.

Technical Context

The ADR03AUJ-R2 implements a trimmed band gap core with internal curvature compensation, enabling low drift over −40°C to +125°C. Its TEMP pin provides a ratiometric analog voltage proportional to die temperature, usable with external circuitry for system-level thermal compensation.

It features a dedicated TRIM pin allowing fine-tuning of output voltage via external resistor network, and maintains regulation stability without output capacitance-unlike many references requiring ≥1 µF load capacitance. Line regulation is specified at 7–30 ppm/V and load regulation at 25–70 ppm/mA across temperature.

Key Specifications

Pinout & Package

ADR03AUJ-R2 is housed in a 5-lead TSOT (UJ-5) surface-mount package, 2.1 mm × 1.6 mm × 0.6 mm, with exposed pad for thermal enhancement (θ_JA = 230°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with ADR03ARZ-REEL7, ADR03AUJ-R2 offers 40% smaller footprint and integrated temperature sensing but trades off thermal resistance; compared with REF03GSZ-REEL7, it delivers superior stability and feature integration at higher unit cost and tighter layout constraints.

Availability

ADR03AUJ-R2 is available at Aetrix Electronics and suitable for precision data acquisition systems, industrial process control systems, and portable battery-powered instruments requiring stable component supply, long-term calibration integrity, and compact packaging.

Supply support for ADR03AUJ-R2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADR03 series belongs to Analog Devices' precision voltage reference product line, engineered for metrology-grade stability in demanding industrial, instrumentation, and automotive subsystems where long-term accuracy and low noise are mandatory.

FAQ

What is the maximum operating temperature range for the ADR03AUJ-R2?

The ADR03AUJ-R2 is fully specified from −40°C to +125°C ambient temperature. This extended industrial range is validated across all electrical parameters-including output voltage, tempco, and noise-and applies to both continuous operation and storage. The device uses a robust band gap architecture and laser-trimmed thin-film resistors to maintain stability across this full span without derating.

Does the ADR03AUJ-R2 require an output capacitor for stability?

No, the ADR03AUJ-R2 does not require an external output capacitor for stability. Its internal compensation ensures unconditional stability with 0 pF load capacitance, as confirmed in the datasheet's "No external capacitor required" feature and Figure 31–33 transient response plots. Adding capacitance may slow turn-on settling but does not improve regulation.

How is the TEMP pin on the ADR03AUJ-R2 used in practice?

The TEMP pin on the ADR03AUJ-R2 outputs a voltage proportional to junction temperature: 550 mV at 25°C with 1.96 mV/°C slope. In practice, it connects to an ADC input to measure die temperature for real-time compensation of sensor offset drift or to trigger thermal throttling. No external components are needed for basic readout, though a series resistor may be added for ESD protection.

Can the ADR03AUJ-R2 replace the REF03 in existing designs?

The ADR03AUJ-R2 is functionally compatible with the REF03 and shares the same 5-lead TSOT package pinout, but it is not a guaranteed drop-in replacement due to differences in TEMP and TRIM pin functionality. While VOUT, VIN, GND, and NC assignments match, the ADR03AUJ-R2's active TEMP and TRIM pins require verification in the target schematic and layout before substitution.

What is the typical noise performance of the ADR03AUJ-R2 below 10 Hz?

The ADR03AUJ-R2 delivers 5 µV_p-p (0.1 Hz to 10 Hz) low-frequency noise, as measured and specified in Table 4 of the Rev. S datasheet. This value corresponds to ~2 ppm_p-p of its 2.5 V output and is verified across production lots. It enables sub-LSB noise contribution in 24-bit ADC systems when combined with proper PCB layout and grounding.