Texas Instruments REF2925AIDBZTG4

Overview

REF2925AIDBZTG4 from Texas Instruments is a precision 2.5 V CMOS band-gap voltage reference in a 3-pin SOT-23 package, delivering ±2% initial accuracy, 100 ppm/°C max temperature drift, 25 mA output current, and only 1 mV typical dropout voltage. It serves as a stable, low-power reference for high-resolution ADCs, portable instrumentation, and battery-powered medical sensors.

For engineers reviewing the REF2925AIDBZTG4 datasheet, REF2925AIDBZTG4 pinout, REF2925AIDBZTG4 application, or REF2925AIDBZTG4 equivalent, key selection criteria include its ultra-low quiescent current (max 50 µA), load regulation (≤100 µV/mA), thermal hysteresis (≤100 ppm), and operation across –40°C to 125°C without requiring an output capacitor.

Technical Context

The REF2925AIDBZTG4 implements a curvature-corrected band-gap topology with two bipolar transistors (Q1, Q2) biased at different current densities; the ΔV_BE voltage is amplified and summed with V_BE2 to achieve near-zero temperature coefficient. Its CMOS output stage enables rail-to-rail operation down to 1 mV headroom under no-load conditions.

It operates without mandatory output capacitance but remains stable with any capacitive load-including low-ESR ceramics-and supports force-sense measurement for accurate load regulation characterization. The device exhibits 28 µV_PP (0.1–10 Hz) noise and 80 µV_RMS (10 Hz–10 kHz), with long-term stability of 24 ppm over 0–1000 hours.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF2925AIDBZTG4, REF3025AIDBZR trades ultra-low IQ and dropout for tighter initial tolerance, while ADR3425ARJZ-R7 improves drift at the cost of mandatory output capacitance and higher dropout-making REF2925AIDBZTG4 optimal for space- and power-constrained, capacitorless applications.

Availability

REF2925AIDBZTG4 is available at Aetrix Electronics and suitable for portable medical sensors, data acquisition systems, hand-held test equipment, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for REF2925AIDBZTG4 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade reference solutions.

The REF29xx family was designed specifically for low-power, high-accuracy voltage referencing in portable, battery-operated, and wide-temperature industrial systems-emphasizing minimal dropout, ultra-low IQ, and capacitorless operation.

FAQ

What is the minimum input voltage required for stable operation of the REF2925AIDBZTG4?

The REF2925AIDBZTG4 requires a minimum input voltage of V_OUT + 1 mV under no-load conditions-i.e., 2.501 V-to maintain regulation. Under full 25 mA load, the dropout rises to ≤50 mV, so VIN must be ≥2.55 V. This ultra-low headroom enables operation directly from single-cell lithium batteries or low-dropout regulators.

Does the REF2925AIDBZTG4 require an output capacitor for stability?

No, the REF2925AIDBZTG4 is internally compensated and stable with any capacitive load-including zero capacitance. Unlike many references, it does not require a minimum output capacitor. However, TI recommends a 0.47 µF ceramic bypass capacitor on the input (IN pin) to suppress supply noise and improve transient response.

What is the long-term stability performance of the REF2925AIDBZTG4?

The REF2925AIDBZTG4 exhibits 24 ppm drift over the first 1000 hours and an additional 15 ppm from 1000 to 2000 hours-totaling 39 ppm over 2000 hours. This measured long-term stability is based on accelerated testing of 30 units and supports reliability-critical applications such as medical diagnostics and industrial calibration equipment.

How does thermal hysteresis affect the REF2925AIDBZTG4's accuracy?

Thermal hysteresis for the REF2925AIDBZTG4 is specified at ≤100 ppm-defined as the output voltage shift after cycling from 25°C → –40°C → 125°C → 25°C. This parameter impacts repeatability in systems undergoing repeated thermal excursions, such as outdoor instrumentation or automotive cabin modules, and is independent of temperature drift.

Can the REF2925AIDBZTG4 drive multiple ADCs simultaneously?

Yes-the REF2925AIDBZTG4 delivers up to 25 mA output current, sufficient to drive multiple 12–16-bit ADC references (e.g., ADS7822, ADS8860) and associated op-amp bias networks without external buffering. Load regulation remains ≤100 µV/mA, ensuring <0.004% cross-channel gain error even with dynamic load sharing.