Texas Instruments REF02BU

Overview

REF02BU from Texas Instruments is a precision +5V voltage reference IC with ±10mV initial accuracy (±0.2%), 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 REF02BU datasheet, REF02BU pinout, REF02BU application, or REF02BU equivalent, key selection criteria include its SO-8 package, laser-trimmed drift performance, external output trim capability (±6%), and industrial-grade thermal stability without requiring external compensation.

Technical Context

The REF02BU implements a bandgap-based reference core with laser-trimmed resistor networks to achieve ±10mV (±0.2%) initial output tolerance and 10ppm/°C max drift across –40°C to +85°C. Its internal architecture includes a dedicated temperature-sensing pin (Pin 3) providing 630mV at 25°C with 2.1mV/°C coefficient, enabling on-board temperature monitoring independent of reference output.

It supports output adjustment via external 10kΩ potentiometer between VOUT and GND with wiper to Trim pin (Pin 6), enabling ±6% tuning while adding only 0.7ppm/°C/100mV drift penalty. Line regulation remains ≤0.012%/V and load regulation ≤0.010%/mA over full temperature and load range.

Key Specifications

Pinout & Package

REF02BU is housed in an SOIC-8 (Package Drawing D, 150mil width) with standard JEDEC MS-012AA footprint, 1.75mm max height, and RoHS-compliant NiPdAu lead finish. Thermal resistance θ_JA = 80°C/W supports operation at full rated load without heatsinking in typical PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02AU, REF02BU delivers tighter initial tolerance and lower drift for critical calibration tasks; versus ADR445BRZ, REF02BU trades some precision for broader supply flexibility and lower power - making it the preferred choice for ruggedized 5V reference needs in factory automation and test equipment.

Availability

REF02BU is available at Aetrix Electronics and suitable for precision A/D and D/A converters, digital voltmeters, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for REF02BU 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 high-reliability components for industrial, automotive, and communications markets.

The REF02BU belongs to TI's precision voltage reference product line, engineered for metrology-grade stability and industrial temperature operation - targeting applications where long-term accuracy and thermal robustness are non-negotiable.

FAQ

What is the initial output voltage tolerance of the REF02BU?

The REF02BU has a guaranteed initial output voltage tolerance of ±10mV (±0.2%) at +25°C, as specified in the official Texas Instruments SBVS003B datasheet. This tolerance is laser-trimmed during manufacturing and applies to all units shipped under the REF02BU ordering code. The REF02BU's tighter tolerance distinguishes it from the REF02AU (±15mV) and ensures immediate system-level accuracy without user trimming in most applications.

Can the REF02BU output voltage be adjusted, and if so, how?

Yes, the REF02BU output voltage can be externally adjusted over a ±6% range using a 10kΩ potentiometer connected between VOUT (Pin 7) and GND (Pin 4), with the wiper attached to the Trim pin (Pin 6). This adjustment introduces only 0.7ppm/°C additional drift per 100mV of output change, preserving thermal stability. The REF02BU's trim capability enables system-level calibration to compensate for PCB trace resistance, amplifier offset, or sensor nonlinearity without degrading overall accuracy.

What is the maximum supply voltage the REF02BU can withstand?

The REF02BU supports a continuous supply voltage range of 8V to 40V on VIN (Pin 2), with an absolute maximum rating of +40V. It remains fully functional and protected against short-circuit conditions across this entire range. The REF02BU's wide input capability eliminates the need for pre-regulation when interfacing with common industrial power rails such as 12V, 24V, and 36V, simplifying power architecture in programmable logic controllers and automated test equipment.

Does the REF02BU include any built-in protection features?

Yes, the REF02BU integrates short-circuit protection on its VOUT (Pin 7), allowing indefinite output shorting to GND or VIN without damage. It also features thermal shutdown and internal current limiting. The REF02BU's robust protection enables reliable deployment in harsh environments like factory floors or field instrumentation where wiring faults or ESD events may occur - eliminating the need for external series resistors or TVS diodes in most designs.

What package type is used for the REF02BU, and what are its key mechanical properties?

The REF02BU is supplied in an SOIC-8 package (JEDEC MS-012AA, TI drawing D), with 150mil body width, 1.75mm max height, and NiPdAu lead finish. Its thermal resistance is θ_JA = 80°C/W, and it complies with RoHS and MSL Level-3 (260°C peak reflow). The REF02BU's SOIC-8 footprint ensures drop-in compatibility with existing layouts designed for industry-standard 8-pin SO packages, including those used for REF02AU and similar voltage references.