Texas Instruments REF4132B33DBVR

Overview

REF4132B33DBVR from Texas Instruments is a precision 3.3 V series voltage reference IC with ±0.05% initial accuracy, 30 ppm/°C max temperature coefficient (B grade), and 100 µA max quiescent current - designed for high-resolution data acquisition systems requiring stable, low-noise reference voltage under industrial temperature conditions (−40°C to +125°C).

For engineers reviewing the REF4132B33DBVR datasheet, REF4132B33DBVR pinout, REF4132B33DBVR application, or REF4132B33DBVR equivalent, key selection considerations include dropout voltage (100 mV max at 0 mA), ±10 mA output drive capability, 15 µV_PP (0.1–10 Hz) noise performance, and SOT-23-5 package compatibility with space-constrained analog signal chains.

Technical Context

The REF4132B33DBVR implements a CMOS-based bandgap core with integrated enable-controlled shutdown mode and low-output-impedance buffer. Its architecture delivers 3.3 V output with thermal hysteresis of 35 ppm and long-term stability of 30 ppm/1000 hrs - critical for metrology-grade instrumentation where drift-induced calibration errors must be minimized over time and temperature cycling.

It operates as a series reference with VIN-to-VREF dropout as low as 50 mV (typical) and supports capacitive loads from 0.1 µF to 10 µF. The EN pin enables precise power sequencing in multi-rail systems, while its 2.5 µA shutdown current supports battery-powered portable test equipment requiring ultra-low standby consumption.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body size, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF4132B33DBVR, REF4332B33DBVR offers superior temperature stability at higher quiescent current, while LM4132BMF-3.3/NOPB provides lower-cost fixed-operation reference without enable control - making REF4132B33DBVR the optimal balance of precision, power efficiency, and design flexibility for modern industrial DAQ.

Availability

REF4132B33DBVR is available at Aetrix Electronics and suitable for data acquisition systems, PLC analog I/O modules, and field transmitters requiring stable component supply with guaranteed long-term availability and consistent parametric performance across production lots.

Supply support for REF4132B33DBVR 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 communications markets.

The REF4132 product line was developed to deliver high-accuracy, low-drift voltage references for high-resolution data converters in demanding industrial environments - emphasizing thermal stability, low noise, and robust packaging for extended field reliability.

FAQ

What is the maximum load current supported by the REF4132B33DBVR?

The REF4132B33DBVR supports ±10 mA output current - meaning it can source up to 10 mA to external loads and sink up to 10 mA from them. This capability allows direct driving of multiple op-amp bias networks or reference inputs of high-precision ADCs/DACs without external buffers. Exceeding this limit may degrade output regulation or trigger internal short-circuit protection.

Does the REF4132B33DBVR require an external output capacitor?

Yes, the REF4132B33DBVR requires a minimum 0.1 µF ceramic capacitor connected between VREF and GND for stability and noise reduction. TI recommends X5R or X7R dielectric types with low ESR. An additional 1–10 µF capacitor may be added in parallel to improve transient response, though this increases turn-on time. Omitting the 0.1 µF capacitor risks oscillation or degraded noise performance in the REF4132B33DBVR.

How does the enable (EN) pin function on the REF4132B33DBVR?

The EN pin on the REF4132B33DBVR controls active/shutdown modes: applying ≥1.6 V enables normal operation with 100 µA max quiescent current, while ≤0.5 V places the device in shutdown with 2.5 µA max IQ and high-impedance VREF output. Voltages between 0.5 V and 1.6 V must be avoided - they cause unstable current draw and potential startup failure. For always-on use, tie EN directly to VIN.

What is the dropout voltage specification for the REF4132B33DBVR at full load?

The dropout voltage for the REF4132B33DBVR is 500 mV maximum at 10 mA load current. At zero load, it drops to 50 mV typical (100 mV max). This means the minimum required input voltage is 3.3 V + 0.5 V = 3.8 V under full 10 mA sourcing conditions. Designers must verify that VIN remains above VREF + VDO across all operating temperatures and load conditions to maintain regulation in the REF4132B33DBVR.

Can the REF4132B33DBVR be used to generate a negative reference voltage?

The REF4132B33DBVR itself provides only a positive 3.3 V output, but it can serve as the precision positive reference in a dual-supply configuration when paired with an op-amp such as the OPA735. In that topology, the REF4132B33DBVR sets the +3.3 V rail, and the OPA735 inverts and buffers it to create a matched −3.3 V rail - enabling split-supply operation for bipolar signal conditioning circuits without compromising reference accuracy.