Texas Instruments REF3225AIDBVR

Overview

REF3225AIDBVR from Texas Instruments is a precision 2.5V bandgap voltage reference IC with 0.01% initial accuracy, 4ppm/°C drift (0°C to +125°C), ±10mA output current, and 110μA quiescent current in SOT23-6 package-designed for high-accuracy data acquisition systems requiring stable excitation for 16-bit ADCs.

For engineers reviewing the REF3225AIDBVR datasheet, REF3225AIDBVR pinout, REF3225AIDBVR application, or REF3225AIDBVR equivalent, this page delivers verified specifications, force-sense architecture details, thermal hysteresis behavior, low-dropout operation down to 5mV, and validated alternatives for portable medical instrumentation and battery-powered test equipment.

Technical Context

The REF3225AIDBVR implements a CMOS-based bandgap core with separate force (OUT_F) and sense (OUT_S) outputs, enabling Kelvin sensing to reject trace resistance errors. Its architecture includes an enable-controlled digital core that reduces shutdown current to ≤1μA while maintaining 100kΩ–400kΩ resistive load at the output.

It operates with supply voltages as low as V_OUT + 5mV (unloaded) and supports full industrial temperature range (–40°C to +125°C) with guaranteed 20ppm/°C max drift. The device achieves 33µV_PP (0.1Hz–10Hz) noise and 48µV_RMS (10Hz–10kHz), and exhibits 55ppm long-term stability over 1000 hours.

Key Specifications

Pinout & Package

SOT23-6 (DBV) package: 2.9mm × 2.8mm footprint with gull-wing leads; RoHS-compliant, NIPDAU finish, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3425ARJZ-R7 and MAX6126AASA+T, REF3225AIDBVR uniquely balances ultra-low drift (4ppm/°C), micropower operation (110μA), and force-sense architecture-making it optimal for portable, battery-constrained systems demanding both precision and layout robustness.

Availability

REF3225AIDBVR is available at Aetrix Electronics and suitable for portable medical instrumentation, handheld test equipment, and industrial data loggers requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for REF3225AIDBVR 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 company delivering analog and embedded processing solutions, with leadership in precision analog ICs and broad portfolio coverage from design-in through production.

The REF32xx family was engineered specifically for high-accuracy, low-power portable instrumentation-emphasizing force-sense topology, sub-100μA quiescent current, and guaranteed drift performance across extended temperature ranges.

FAQ

What is the minimum supply voltage required for stable operation of REF3225AIDBVR?

The REF3225AIDBVR operates with a minimum supply voltage of 2.505V (V_OUT + 5mV) under no-load conditions. At full ±10mA load, dropout increases to ≤50mV, requiring ≥2.55V supply. This ultra-low dropout enables use with single-cell Li-ion batteries down to 2.8V end-of-discharge voltage while maintaining regulation.

How does the force-sense architecture of REF3225AIDBVR improve system accuracy?

The REF3225AIDBVR uses separate OUT_F (force) and OUT_S (sense) pins to actively regulate voltage at the load by measuring feedback at the remote point. This compensates for voltage drop across PCB traces and connectors-enabling <0.01% accuracy even with 100mΩ series resistance-critical for high-resolution data acquisition where layout-induced errors dominate.

Can REF3225AIDBVR be used without an output capacitor?

Yes. REF3225AIDBVR is unconditionally stable with any capacitive load-including zero capacitance-and does not require an output capacitor for stability. A 0.47μF bypass capacitor on the IN pin is recommended to suppress supply noise, but the output remains stable whether driving a 100pF scope probe or a 10μF bulk capacitor.

What is the thermal hysteresis specification for REF3225AIDBVR?

REF3225AIDBVR exhibits 100ppm thermal hysteresis after first temperature cycle (–40°C → +125°C → +25°C), reducing to 25ppm on subsequent cycles. This value is measured per JEDEC JESD22-A211 and reflects reversible mechanical stress effects in the silicon die and package-distinct from long-term drift or tempco.

Does REF3225AIDBVR support shutdown mode, and what is its current draw in that state?

Yes. When the ENABLE pin is held ≤0.7V, REF3225AIDBVR enters shutdown mode with typical current draw of 0.1μA and maximum of 1μA. In this state, the output becomes a high-impedance resistive load (100kΩ–400kΩ to GND_F), allowing rapid wake-up (<60μs settling to 0.1%) upon ENABLE reassertion.