Texas Instruments REF02AUG4

Overview

REF02AUG4 from Texas Instruments is a precision +5V voltage reference IC with ±0.2% initial accuracy, 10ppm/°C max temperature drift over –40°C to +85°C, 10µVPP low-noise output (0.1Hz–10Hz), and operates from 8V to 40V supply. It delivers stable 5V for high-accuracy A/D and D/A converters, digital voltmeters, and calibration standards.

For engineers reviewing the REF02AUG4 datasheet, REF02AUG4 pinout, REF02AUG4 application, or REF02AUG4 equivalent, key selection criteria include its laser-trimmed drift performance, external output adjustability (±6%), short-circuit protection, and SO-8 package compatibility with industrial-grade thermal stability.

Technical Context

The REF02AUG4 implements a bandgap-based reference core with laser-trimmed resistor networks to achieve 10ppm/°C max drift across –40°C to +85°C. Its trim pin enables ±6% output adjustment without degrading temperature coefficient beyond 0.7ppm/% change per 100mV shift.

It features internal short-circuit protection, operates with only 1.4mA max quiescent current, and maintains 0.008%/mA load regulation and 0.01%/V line regulation - critical for portable instrumentation and precision test equipment where supply variation and load transients must not perturb reference integrity.

Key Specifications

Pinout & Package

REF02AUG4 is housed in an SOIC-8 (D) package with 1.27mm lead pitch, 3.9mm body width, and 1.75mm max height - compatible with standard surface-mount assembly and IPC-7351 land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02AUG4, REF5050IDR offers superior drift performance but sacrifices field-adjustability, while ADR445ARMZ adds enable functionality and tighter initial tolerance at the cost of higher supply current and no temperature monitoring output - making REF02AUG4 optimal for cost-sensitive industrial calibrators requiring both trim and Temp diagnostics.

Availability

REF02AUG4 is available at Aetrix Electronics and suitable for precision calibration standards, A/D and D/A converters, and digital voltmeters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for REF02AUG4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic technologies, with decades of heritage in precision analog design.

The REF02 product line was engineered specifically for industrial and instrumentation applications demanding robust 5V reference stability under wide supply, load, and temperature variations - prioritizing drift, noise, and adjustability over ultra-low power or ultra-high precision.

FAQ

What is the maximum allowable input voltage for REF02AUG4?

The absolute maximum input voltage for REF02AUG4 is +40V. Operation within the recommended 8V to 40V range ensures specified performance including 0.01%/V line regulation and 10ppm/°C temperature drift. Exceeding +40V may cause permanent damage, and operation below 8V results in loss of regulation and undefined output behavior. REF02AUG4 includes internal overvoltage clamping but is not rated for sustained operation above its absolute maximum rating.

Can REF02AUG4 be used to generate a 5.12V reference for binary-scale ADCs?

Yes, REF02AUG4 supports 5.12V output via its Trim pin using a 10kΩ potentiometer - enabling precise binary scaling for 8-bit (20mV LSB) and higher-resolution systems. The datasheet confirms ±6% adjustment range (±300mV), and specifies that temperature coefficient degradation remains minimal at ~0.7ppm/°C per 100mV of adjustment. This makes REF02AUG4 suitable for calibrating ADCs where exact power-of-two reference voltages improve code alignment and reduce software correction overhead.

Does REF02AUG4 provide any diagnostic or monitoring capability?

Yes, REF02AUG4 includes a dedicated Temp pin (Pin 3) that outputs a linear 630mV at 25°C with a coefficient of 2.1mV/°C across –55°C to +125°C. This allows real-time die temperature monitoring without external sensors, supporting thermal derating, compensation algorithms, or fault detection. Loading the Temp pin with ≤1µA preserves accuracy, and the pin is insensitive to capacitive loading - simplifying integration into compact PCB layouts where space for discrete temperature sensing is constrained.

What is the short-circuit behavior of REF02AUG4?

REF02AUG4 features built-in short-circuit protection that limits output current to approximately 30mA when VOUT is shorted to GND or VIN, allowing indefinite short-circuit duration without damage. During fault conditions, the device maintains thermal safety via internal current limiting and junction temperature control, with absolute max junction temperature rated at +150°C. This protection enables safe use in test equipment and automated calibration systems where accidental shorts may occur during probing or relay switching.

Is REF02AUG4 RoHS compliant and what is its moisture sensitivity level?

Yes, REF02AUG4 is RoHS compliant and carries a JEDEC MSL Level-3 rating (260°C peak reflow, 168-hour floor life), consistent with its SOIC-8 (D) package construction. The device uses NiPdAu (NIPDAU) lead finish and is qualified for standard surface-mount assembly processes. Full compliance documentation, including material declarations and reflow profile guidance, is available in TI's official PACKAGE OPTION ADDENDUM for REF02AU/REF02AUG4 variants.