Texas Instruments REF2925AIDBZT

Overview

REF2925AIDBZT 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 ultra-low 1 mV dropout voltage. It serves as a stable, low-power reference for high-resolution ADCs and portable instrumentation requiring tight voltage stability across –40°C to 125°C.

For engineers reviewing the REF2925AIDBZT datasheet, REF2925AIDBZT pinout, REF2925AIDBZT application, or REF2925AIDBZT equivalent, key selection criteria include its 2.5 V nominal output, 50 µA max quiescent current, load regulation of ≤100 µV/mA, and compatibility with capacitive loads without mandatory output capacitance.

Technical Context

The REF2925AIDBZT implements a curvature-compensated band-gap topology using two bipolar transistors (Q1, Q2) biased at different current densities to generate a PTAT voltage across R1, which is gain-adjusted and summed with a CTAT base-emitter voltage-yielding a near-zero temperature coefficient output. Its CMOS architecture enables rail-to-rail operation down to 1 mV above V_OUT under no-load conditions.

It operates over –40°C to 125°C with guaranteed 2.45 V to 2.55 V output voltage, 28 µV_PP (0.1–10 Hz) noise, and thermal hysteresis ≤100 ppm. Load regulation is characterized using force-and-sense methodology to isolate device-intrinsic performance from PCB trace effects.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, JEDEC MO-178 compatible. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3425ARMZ and MAX6025AEUR+T, REF2925AIDBZT offers the widest industrial temperature range (–40°C to 125°C) and lowest dropout (1 mV), making it optimal for battery-powered equipment operating in harsh environments where supply headroom is constrained.

Availability

REF2925AIDBZT 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 REF2925AIDBZT 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, power management, and signal chain solutions.

The REF29xx family was designed specifically for low-power, high-accuracy voltage referencing in space- and energy-constrained applications - emphasizing ultra-low dropout, minimal quiescent current, and robust operation across industrial temperature extremes.

FAQ

What is the minimum input voltage required for stable operation of the REF2925AIDBZT?

The REF2925AIDBZT requires a minimum input voltage of V_OUT + 1 mV (i.e., 2.501 V) under no-load conditions. With a 25 mA load, the datasheet specifies VIN ≥ V_REF + 50 mV (2.55 V) to maintain regulation. Below this, output voltage may droop or become unstable - REF2925AIDBZT must be used with adequate supply headroom per its dropout specification.

Does the REF2925AIDBZT require an output capacitor for stability?

No, the REF2925AIDBZT is internally compensated and stable with any capacitive load - including zero capacitance. Unlike many references, it does not require a minimum output capacitor. However, a 0.47 µF ceramic bypass capacitor on the input (IN pin) is strongly recommended per TI layout guidelines to suppress supply noise and ensure transient response integrity for REF2925AIDBZT.

What is the long-term stability performance of the REF2925AIDBZT?

The REF2925AIDBZT exhibits typical long-term stability of 24 ppm over the first 1000 hours and 15 ppm from 1000 to 2000 hours, measured across 30 units. This drift behavior is logarithmic and diminishes over time, supporting high-reliability applications such as medical diagnostics and industrial calibration equipment where reference drift must remain predictable - REF2925AIDBZT's aging profile is fully characterized in its datasheet.

Can the REF2925AIDBZT drive a 10 µF ceramic capacitor directly?

Yes, the REF2925AIDBZT is stable with any capacitive load, including 10 µF ceramic capacitors. However, for low-output-voltage variants like REF2912, TI recommends limiting capacitance to ≤10 µF with low ESR. For REF2925AIDBZT, no ESR or capacitance restrictions apply - the device's CMOS output stage ensures unconditional stability, simplifying design for REF2925AIDBZT in noisy or dynamically loaded systems.

How does thermal hysteresis affect the REF2925AIDBZT's accuracy in cycling environments?

Thermal hysteresis for REF2925AIDBZT is specified at ≤100 ppm - defined as the output voltage shift after cycling from 25°C → –40°C → 125°C → 25°C. This represents a maximum 250 µV deviation from the pre-cycled 2.5 V output. In applications with frequent thermal cycling (e.g., outdoor IoT gateways), this hysteresis contributes to non-repeatable offset errors - REF2925AIDBZT's hysteresis is fully characterized and included in total error budget calculations per TI's box-method testing.