Texas Instruments REF3433MDBVTEP

Overview

REF3433MDBVTEP from Texas Instruments is a precision 3.3 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 under extended temperature (–55°C to 125°C) and harsh-environment conditions.

For engineers reviewing the REF3433MDBVTEP datasheet, REF3433MDBVTEP pinout, REF3433MDBVTEP application, or REF3433MDBVTEP equivalent, this page delivers verified electrical specs, force/sense Kelvin architecture implications, dropout behavior across load/temperature, noise performance (3.8 µV_PP/V, 0.1–10 Hz), and validated alternatives for defense, aerospace, and industrial instrumentation designs.

Technical Context

The REF3433MDBVTEP implements a precision bandgap core with buffered dual-output force/sense architecture (OUT_F/OUT_S and GND_F/GND_S), enabling 4-wire Kelvin connections to eliminate PCB trace IR drop errors in high-accuracy ADC/DAC biasing. Its enable-controlled shutdown mode reduces quiescent current to ≤3 µA while maintaining high-impedance outputs.

It operates with ultra-low 95 µA max quiescent current across –55°C to 125°C, supports input voltages up to 12 V, and achieves 50 mV typical dropout at zero load-scaling to 500 mV max at ±10 mA and full temperature range. Noise performance is characterized at 3.8 µV_PP/V (0.1–10 Hz) for REF3433-EP variants, confirmed in TI SBAS942B.

Key Specifications

Pinout & Package

REF3433MDBVTEP is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in PLC modules and sensor transmitters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3433ARJZ-REEL7 and MAX6073AASA+, REF3433MDBVTEP uniquely combines force/sense architecture, 3.8 µV_PP noise, and extended temperature qualification-making it the only option qualified for high-reliability, high-accuracy applications where layout-induced error and thermal drift must be minimized.

Availability

REF3433MDBVTEP 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 REF3433MDBVTEP 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 for industrial, automotive, and aerospace markets.

REF3433MDBVTEP belongs to the REF34xx-EP series-a radiation-tolerant, extended-temperature voltage reference family designed specifically for defense, aerospace, and medical instrumentation demanding high initial accuracy, low drift, and long-term stability.

FAQ

What is the maximum load current supported by REF3433MDBVTEP?

REF3433MDBVTEP supports ±10 mA output current-both sourcing and sinking-across its full operating temperature range of –55°C to 125°C. This capability allows direct driving of multiple ADC reference inputs or op-amp buffers without external current boosting, making REF3433MDBVTEP suitable for multi-channel data acquisition systems where board space and component count are constrained.

Does REF3433MDBVTEP include an enable pin, and what are its logic thresholds?

Yes, REF3433MDBVTEP features an ENABLE pin (Pin 3) that controls active and shutdown modes. The device enters active mode when ENABLE voltage is ≥1.6 V and shuts down (IQ ≤3 µA) when ENABLE is ≤0.5 V. This function is explicitly specified in TI SBAS942B and enables precise power gating in battery-operated field instruments-ensuring REF3433MDBVTEP contributes minimal standby current while retaining fast wake-up response.

How does the force/sense architecture of REF3433MDBVTEP improve accuracy?

REF3433MDBVTEP uses separate force (OUT_F, GND_F) and sense (OUT_S, GND_S) terminals to implement a 4-wire Kelvin connection. This architecture eliminates voltage errors caused by PCB trace resistance between the reference and load-critical in high-accuracy systems where even 100 mΩ of trace resistance introduces 1 mV error at 10 mA. By routing sense lines directly to the ADC reference input, REF3433MDBVTEP maintains true 3.3 V potential at the point of use, preserving sub-0.01% gain accuracy.

What is the noise performance of REF3433MDBVTEP, and how is it measured?

REF3433MDBVTEP delivers 3.8 µV_PP (0.1–10 Hz) output voltage noise per volt of output-confirmed in TI SBAS942B for the REF3433-EP variant. At its 3.3 V output, this equates to ~12.5 µV_PP. The measurement follows JEDEC-standard low-frequency noise protocols using precision integrating voltmeters. This ultra-low 1/f noise ensures REF3433MDBVTEP does not degrade ENOB in 24-bit delta-sigma converters such as ADS1287 used in seismic and metrology applications.

Is REF3433MDBVTEP qualified for extended temperature and high-reliability applications?

Yes, REF3433MDBVTEP is explicitly qualified for –55°C to 125°C operation with controlled baseline, single fabrication/assembly site, extended product life cycle, and full traceability-meeting requirements for defense, aerospace, and medical applications. Its specifications-including 10 ppm/°C tempco, 25 ppm/1000 hrs long-term stability, and 2500 V HBM ESD rating-are guaranteed across this full range, distinguishing REF3433MDBVTEP from commercial-grade references not tested beyond 85°C.