Texas Instruments REF4132B50DBVR

Overview

REF4132B50DBVR from Texas Instruments is a precision 5.0 V CMOS series voltage reference with ±0.05% initial accuracy, 30 ppm/°C max temperature coefficient (B grade), 100 µA max quiescent current, and ±10 mA output drive capability-designed for high-resolution data acquisition systems requiring stable excitation in PLC analog I/O modules.

For engineers reviewing the REF4132B50DBVR datasheet, REF4132B50DBVR pinout, REF4132B50DBVR application, or REF4132B50DBVR equivalent, key selection criteria include dropout voltage (100 mV at 10 mA), low 15 µV_PP (0.1–10 Hz) noise, long-term stability (30 ppm/1000 hrs), thermal hysteresis (35 ppm), and SOT-23-5 package compatibility with LM4132/LM4128.

Technical Context

The REF4132B50DBVR implements a low-drift bandgap core with integrated enable-controlled shutdown mode, delivering regulated 5.0 V output from input voltages as low as V_REF + V_DO (5.1 V min). Its CMOS architecture enables ultra-low quiescent current (≤100 µA) across −40°C to +125°C while maintaining 120 ppm/mA max load regulation and 55 ppm/V max line regulation at 5 V output.

It features a dedicated EN pin for active-high enable logic (1.6 V threshold), internal buffer for ±10 mA sourcing/sinking, and supports stable operation with 0.1–10 µF output capacitance. Thermal hysteresis (35 ppm) and long-term drift (30 ppm/1000 hrs) are characterized per JEDEC JESD22-A110 and JESD22-A108 standards.

Key Specifications

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm), surface-mount, RoHS-compliant, rated for −40°C to +125°C operating temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4132BMF-5.0/NOPB, REF4132B50DBVR delivers tighter initial accuracy and lower drift at identical package size and lower power; versus ADR4550BRZ, it trades some accuracy for 90% lower IQ and 40% smaller footprint-ideal for portable, high-channel-count DAQ.

Availability

REF4132B50DBVR is available at Aetrix Electronics and suitable for PLC analog I/O modules, field transmitters, and battery test equipment requiring stable component supply with guaranteed long-term availability and traceable lot control.

Supply support for REF4132B50DBVR 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 since 1930.

The REF4132 product line delivers low-drift, low-power voltage references optimized for high-resolution data acquisition in industrial automation, test equipment, and sensor signal chains.

FAQ

What is the maximum load current supported by the REF4132B50DBVR?

The REF4132B50DBVR supports ±10 mA output current-capable of sourcing and sinking up to 10 mA each. This enables direct driving of multiple ADC reference inputs or sensor excitation circuits without external buffers. Exceeding this limit risks output voltage deviation beyond specifications and potential thermal stress; short-circuit protection limits current to 18 mA. Always verify power dissipation using R_θJA = 185 °C/W under worst-case ambient conditions.

Does the REF4132B50DBVR require an external output capacitor?

Yes, the REF4132B50DBVR requires a minimum 0.1 µF ceramic capacitor on the VREF pin for stability, as specified in the datasheet. A 1–10 µF bulk capacitor may be added in parallel to improve transient response under dynamic load changes, though doing so increases turn-on time. Low-ESR X5R/X7R dielectrics are recommended; electrolytic capacitors must be paralleled with 0.1 µF ceramic to maintain stability. Omitting the 0.1 µF capacitor risks oscillation and degraded noise performance.

How does the EN pin function on the REF4132B50DBVR?

The EN pin on the REF4132B50DBVR is an active-high enable input: applying ≥1.6 V places the device in active mode with full 5.0 V output and ≤100 µA quiescent current; applying ≤0.5 V disables the output (high-impedance state) and reduces quiescent current to ≤2.5 µA. Voltages between 0.5 V and 1.6 V must be avoided-they cause unstable operation and elevated supply current. If unused, tie EN directly to VIN to ensure continuous operation.

What is the dropout voltage specification for the REF4132B50DBVR at full load?

The REF4132B50DBVR has a maximum dropout voltage of 500 mV at 10 mA load current, meaning it requires a minimum input voltage of 5.5 V to maintain regulation at full output current. At zero load, dropout is 50–100 mV (5.05–5.10 V min). This low dropout enables efficient operation from tightly regulated 5.5 V rails in space-constrained industrial modules, minimizing heat generation compared to older references requiring >1 V headroom.

Can the REF4132B50DBVR be used to generate a negative reference voltage?

Yes, the REF4132B50DBVR can be used with an op amp such as the OPA735 to generate a matched negative reference (e.g., –2.5 V) from a single +5 V supply, as shown in TI's reference design. The REF4132B50DBVR provides the stable +2.5 V node (via resistor divider from 5.0 V), and the OPA735 inverts and buffers it. Critical design considerations include matching R1/R2 temperature coefficients and minimizing thermal gradients-this configuration leverages the REF4132B50DBVR's low drift and noise to preserve overall bipolar reference accuracy.