Texas Instruments REF3440MDBVTEP

Overview

REF3440MDBVTEP from Texas Instruments is a precision 4.096 V CMOS voltage reference 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 under extended temperature (–55°C to 125°C) and harsh-environment conditions.

For engineers reviewing the REF3440MDBVTEP datasheet, REF3440MDBVTEP pinout, REF3440MDBVTEP application, or REF3440MDBVTEP equivalent, key selection criteria include its 3.8 µV_PP/V (0.1–10 Hz) noise performance, 95 µA max quiescent current, 6-pin SOT-23 package with force/sense outputs, and EN-controlled shutdown mode enabling ultra-low-power operation in battery-powered instrumentation.

Technical Context

The REF3440MDBVTEP implements a precision bandgap core with buffered force-sense output architecture, supporting true 4-wire Kelvin connections to eliminate IR drop errors in high-accuracy analog signal chains. Its enable-controlled shutdown reduces quiescent current to ≤3 µA while maintaining high-impedance outputs.

It delivers 4.096 V output with 25 ppm/1000 hrs long-term stability and supports capacitive loads from 0.1 µF to 10 µF. The device operates across 12 V input range with dropout as low as 50 mV at zero load and 500 mV at full ±10 mA load over –55°C to 125°C.

Key Specifications

Pinout & Package

REF3440MDBVTEP is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in industrial modules and aerospace avionics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3440ARMZ and MAX6070BASA41, REF3440MDBVTEP uniquely combines force-sense topology, 10 ppm/°C drift, enable control, and military-grade temperature range-making it the sole option for high-integrity 4-wire data acquisition in extended environments.

Availability

REF3440MDBVTEP 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 and long-lifecycle programs.

Supply support for REF3440MDBVTEP 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 expertise in precision voltage references and data converter ecosystems.

REF3440MDBVTEP belongs to the REF34xx-EP family-engineered specifically for defense, aerospace, and medical applications demanding extended temperature operation (–55°C to 125°C), controlled baseline manufacturing, and long-term stability in safety-critical signal chains.

FAQ

What is the output voltage tolerance of REF3440MDBVTEP over temperature?

The REF3440MDBVTEP guarantees ±0.05% initial accuracy at 25°C and maintains ≤10 ppm/°C temperature coefficient over –55°C to 125°C. This translates to a maximum output deviation of ±0.52 mV across the full range-verified per the box method in TI's SBAS942B datasheet. REF3440MDBVTEP achieves this via precision laser-trimmed bandgap core and on-chip curvature correction.

Does REF3440MDBVTEP support 4-wire (Kelvin) connections, and how are they implemented?

Yes, REF3440MDBVTEP supports true 4-wire Kelvin connections via dedicated OUT_F/OUT_S and GND_F/GND_S pins. OUT_F and GND_F deliver load current, while OUT_S and GND_S provide high-impedance sense nodes routed directly to the ADC's reference input and ground-eliminating voltage drop errors in PCB traces. This architecture is explicitly validated in the REF3440MDBVTEP pin configuration diagram and typical application circuits.

What is the minimum input voltage required for REF3440MDBVTEP to regulate at full load?

At ±10 mA load and –55°C to 125°C, REF3440MDBVTEP requires a minimum input voltage of V_REF + V_DO = 4.096 V + 0.5 V = 4.596 V. The datasheet specifies 500 mV max dropout at full load and extreme temperature, so operation from a 5 V rail is valid. Below this threshold, regulation degrades and output follows input minus dropout.

How does the ENABLE pin function in REF3440MDBVTEP, and what happens during shutdown?

The ENABLE pin places REF3440MDBVTEP in active mode when ≥1.6 V and shutdown mode when ≤0.5 V. In shutdown, output impedance rises to >100 MΩ, quiescent current drops to ≤3 µA, and OUT_F/OUT_S enter high-Z state-preserving system power while allowing fast wake-up (<2.5 ms turnon time). This behavior is characterized in Figure 13 of the SBAS942B datasheet.

Can REF3440MDBVTEP drive a 10 µF output capacitor, and what is the impact on performance?

Yes, REF3440MDBVTEP is stable with 0.1 µF to 10 µF output capacitance, as confirmed in Section 7.5 (Capacitive Load) of SBAS942B. Using 10 µF improves load transient response but increases turnon time to 2.5 ms (vs. faster settling with smaller caps). The device's internal compensation ensures phase margin remains >60° across this range-validated in Figure 7 load transient waveforms.