Texas Instruments REF3425MDBVTEP

Overview

REF3425MDBVTEP from Texas Instruments is a precision 2.5 V CMOS voltage reference IC with ±0.05% initial accuracy, 10 ppm/°C max temperature coefficient, and ±10 mA output current capability-designed for high-resolution data acquisition systems requiring stable, low-noise reference voltage in extended-temperature aerospace and industrial environments.

For engineers reviewing the REF3425MDBVTEP datasheet, REF3425MDBVTEP pinout, REF3425MDBVTEP application, or REF3425MDBVTEP equivalent, this page delivers verified electrical specs, force/sense Kelvin pin architecture, dropout behavior across load/temperature, noise performance (3.8 µV_PP/V, 0.1–10 Hz), and drop-in alternatives for precision analog signal chains.

Technical Context

The REF3425MDBVTEP implements a bandgap core with buffered force/sense outputs and digital enable control, enabling precise 4-wire Kelvin regulation independent of PCB trace resistance. Its low 95 µA max quiescent current and 50 mV typical dropout at zero load support battery-powered instrumentation.

It operates across –55°C to +125°C with guaranteed 25 ppm/1000 hrs long-term stability and 0.1–10 Hz output noise of 3.8 µV_PP/V-critical for 24-bit ADCs like ADS1287. The ENABLE pin provides active-high control with <2 µA shutdown current and defined logic thresholds (1.6 V high, 0.5 V low).

Key Specifications

Pinout & Package

REF3425MDBVTEP is housed in a space-constrained 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts in avionics and medical modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3425ARMZ and MAX6070AESA+, REF3425MDBVTEP uniquely combines military-grade temperature range, ultra-low 1/f noise, integrated ENABLE, and true 4-wire Kelvin architecture-making it the sole option for uncalibrated, high-reliability 24-bit DAQ in harsh environments.

Availability

REF3425MDBVTEP is available at Aetrix Electronics and suitable for precision data acquisition systems, PLC analog I/O modules, and field transmitters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for REF3425MDBVTEP 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 and embedded processing technologies, with decades of heritage in precision analog design and aerospace-grade qualification.

REF3425MDBVTEP belongs to the REF34xx-EP series-a family engineered specifically for defense, aerospace, and medical applications demanding extended temperature operation, controlled manufacturing baselines, and guaranteed long-term stability.

FAQ

What is the operating temperature range of the REF3425MDBVTEP?

The REF3425MDBVTEP is specified for continuous operation from –55°C to +125°C, with full electrical performance guaranteed across this extended range. It meets military-grade environmental requirements including controlled baseline, single fabrication site, and extended product lifecycle-making REF3425MDBVTEP suitable for avionics, downhole tools, and space-qualified subsystems.

Does REF3425MDBVTEP support 4-wire Kelvin connections, and how are they implemented?

Yes, REF3425MDBVTEP implements true 4-wire Kelvin sensing via dedicated OUT_F/OUT_S and GND_F/GND_S pins. OUT_F and GND_F carry load current, while OUT_S and GND_S provide high-impedance feedback to the internal regulator-eliminating voltage error from PCB trace resistance. This architecture ensures REF3425MDBVTEP maintains ±0.05% accuracy even with 100 mΩ interconnect impedance.

What is the maximum load current and dropout voltage of REF3425MDBVTEP at elevated temperature?

REF3425MDBVTEP delivers ±10 mA sourcing/sinking current across –55°C to +125°C. At 10 mA load and full temperature range, its dropout voltage is 500 mV max-meaning it regulates stably with as little as 3.0 V input. At zero load and 25°C, dropout drops to 50 mV, enabling efficient operation from low-headroom supplies.

How does the ENABLE pin function on REF3425MDBVTEP, and what are its voltage thresholds?

The ENABLE pin on REF3425MDBVTEP controls active/shutdown modes: device operates normally when EN ≥1.6 V, and enters ultra-low-power shutdown (<2 µA IQ) when EN ≤0.5 V. The pin tolerates voltages up to VIN and is compatible with 1.8 V, 3.3 V, and 5 V logic families-no external level-shifting required. REF3425MDBVTEP remains fully specified across all EN states within its rated temperature range.

What noise performance does REF3425MDBVTEP deliver, and why is it critical for high-resolution ADCs?

REF3425MDBVTEP delivers 3.8 µV_PP/V (0.1–10 Hz) low-frequency noise-among the lowest in its class. This directly limits quantization uncertainty in 24-bit delta-sigma ADCs like ADS1287, preserving effective number of bits (ENOB). For example, at 2.5 V full scale, 3.8 µV_PP corresponds to <0.0002% RMS error-well below the LSB of a 24-bit converter (0.15 ppm), making REF3425MDBVTEP essential for metrology-grade DAQ.