Texas Instruments REF4132A50DBVR

Overview

REF4132A50DBVR from Texas Instruments is a precision 5.0 V series voltage reference IC with ±0.05% initial accuracy, 12 ppm/°C max temperature coefficient (A grade), 100 µA max quiescent current, ±10 mA output drive capability, and 15 µV_PP (0.1–10 Hz) low-frequency noise - deployed in high-resolution data acquisition systems requiring stable excitation for 24-bit ADCs.

For engineers reviewing the REF4132A50DBVR datasheet, REF4132A50DBVR pinout, REF4132A50DBVR application, or REF4132A50DBVR equivalent, key selection criteria include dropout voltage at 10 mA load (500 mV max), thermal hysteresis (35 ppm), long-term stability (30 ppm/1000 hrs), enable-pin logic thresholds (1.6 V high / 0.5 V low), and SOT-23-5 package compatibility with space-constrained industrial sensor nodes.

Technical Context

The REF4132A50DBVR implements a CMOS-based bandgap core with integrated output buffer and enable-controlled shutdown circuitry. Its architecture delivers rail-to-rail output regulation with line regulation of 2 ppm/V and load regulation of 20 ppm/mA under nominal conditions.

It operates across −40°C to +125°C with input voltage as low as V_REF + 50 mV (5.05 V min for 5.0 V output), supports capacitive loads from 0.1 µF to 10 µF, and features internal protection against short-circuit currents up to 18 mA while maintaining 35 ppm thermal hysteresis and 30 ppm/1000 hrs long-term drift.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5050AIDR and ADR4550BRZ, REF4132A50DBVR uniquely balances 5.0 V operation from 5.5 V supply, SOT-23-5 footprint, 100 µA I_Q, and 12 ppm/°C tempco - making it optimal for space- and power-constrained industrial edge nodes where moderate accuracy suffices.

Availability

REF4132A50DBVR is available at Aetrix Electronics and suitable for PLC analog I/O modules, battery test equipment, and motor drive control modules requiring stable component supply across extended production lifecycles.

Supply support for REF4132A50DBVR 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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and communications markets.

The REF4132 product line delivers low-drift, low-power, small-footprint series voltage references optimized for high-accuracy data acquisition in harsh environments - targeting applications where long-term stability and thermal robustness outweigh ultra-fine initial accuracy.

FAQ

What is the maximum load current supported by the REF4132A50DBVR?

The REF4132A50DBVR supports ±10 mA output current - meaning it can source up to +10 mA and sink up to –10 mA while maintaining specified accuracy and noise performance. At 10 mA load, dropout voltage is 500 mV max, requiring VIN ≥5.5 V. Exceeding ±10 mA may trigger internal current limiting or degrade regulation.

Does the REF4132A50DBVR require an external output capacitor?

Yes, the REF4132A50DBVR requires a minimum 0.1 µF ceramic capacitor (X5R/X7R) on the VREF pin for stability. TI specifies stable operation with 0.1 µF to 10 µF output capacitance. Larger values improve transient response but increase turn-on time; a 10 µF capacitor yields ~2.5 ms settling vs. 0.1 µF's faster response.

How does the enable pin (EN) function on the REF4132A50DBVR?

The EN pin on the REF4132A50DBVR controls active/shutdown modes: ≥1.6 V enables normal operation (100 µA I_Q); ≤0.5 V places the device in shutdown (2.5 µA I_Q) with 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. Tie EN to VIN if always-on operation is required.

What is the thermal hysteresis specification for the REF4132A50DBVR?

The REF4132A50DBVR has a thermal hysteresis of 35 ppm - measured as the output voltage change after cycling from 25°C → –40°C → +125°C → 25°C. This represents a worst-case 0.175 mV shift for the 5.0 V output, critical for applications requiring repeatable calibration after thermal stress, such as field-deployed sensor transmitters.

Can the REF4132A50DBVR be used to generate a negative reference voltage?

Yes, the REF4132A50DBVR can generate a precise negative reference when paired with an op-amp like OPA735 in an inverting configuration. Figure 19 in the datasheet shows a verified circuit using matched resistors (R1 = R2 = 10 Ω) to derive –2.5 V from the 5.0 V output. Matching resistor tempcos is essential to preserve net drift below 10 ppm/°C.