Texas Instruments REF4132B40DBVRQ1

Overview

REF4132B40DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified series voltage reference delivering 4.096 V output with ±0.05% initial accuracy, 30 ppm/°C max temperature coefficient (B grade), and 100 µA max quiescent current in a 5-pin SOT-23 package. It serves as a precision analog reference for high-resolution ADCs in ADAS front camera and traction inverter systems.

For engineers reviewing the REF4132B40DBVRQ1 datasheet, REF4132B40DBVRQ1 pinout, REF4132B40DBVRQ1 application, or REF4132B40DBVRQ1 equivalent, key selection considerations include dropout voltage (100 mV at 0 mA), ±10 mA output drive capability, low 15 µV_PP (0.1–10 Hz) noise, thermal hysteresis (35 ppm), and enable-controlled shutdown mode.

Technical Context

The REF4132B40DBVRQ1 implements a CMOS-based bandgap core with integrated output buffer and enable logic. Its architecture supports stable operation with 0.1–10 µF capacitive loads and maintains accuracy across −40°C to +125°C ambient range.

It features active-mode regulation with 2 ppm/V line regulation and 20 ppm/mA load regulation, plus shutdown mode reducing quiescent current to 2.5 µA typical. The EN pin controls state transition with defined logic thresholds (1.6 V high, 0.5 V low), avoiding intermediate-voltage instability.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin 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 LM4132B40QDBVRQ1, REF4132B40DBVRQ1 adds enable functionality and improves tempco by 2.5×; versus REF4132A40DBVRQ1, it trades 12→30 ppm/°C drift for lower unit cost while retaining identical accuracy, noise, and package compatibility.

Availability

REF4132B40DBVRQ1 is available at Aetrix Electronics and suitable for ADAS front camera, traction inverter, and automotive DC/DC converter designs requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for REF4132B40DBVRQ1 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and communications markets.

REF4132B40DBVRQ1 belongs to TI's automotive-qualified precision voltage reference product line, engineered specifically for high-accuracy, low-drift, and low-power operation in safety-critical vehicle subsystems including ADAS, powertrain, and charging infrastructure.

FAQ

What is the maximum load current supported by the REF4132B40DBVRQ1?

The REF4132B40DBVRQ1 supports ±10 mA output current in active mode. This bidirectional capability allows it to source or sink up to 10 mA while maintaining specified accuracy and stability. At 10 mA load, dropout voltage rises to 500 mV, requiring minimum VIN of 4.596 V. Exceeding this limit risks output regulation loss and increased thermal stress.

Does the REF4132B40DBVRQ1 require external capacitors, and if so, what values are recommended?

Yes, the REF4132B40DBVRQ1 requires external capacitors for stability and noise reduction. A 0.1 µF ceramic capacitor is mandatory at the VIN pin, placed within 2 mm of the package. For VREF, a minimum 0.1 µF ceramic capacitor is required; 1–10 µF additional capacitance may be added for improved transient response, though this increases turn-on time. All capacitors must be low-ESR X5R/X7R types.

How does the enable (EN) pin function on the REF4132B40DBVRQ1?

The EN pin on the REF4132B40DBVRQ1 controls device state: ≥1.6 V enables normal operation with 100 µA max IQ; ≤0.5 V places the device in shutdown mode with <5 µA IQ and high-impedance VREF output. Voltages between 0.5 V and 1.6 V must be avoided, as they cause unstable current draw and potential startup failure. Tie EN directly to VIN if shutdown is unused.

What is the thermal hysteresis specification for the REF4132B40DBVRQ1, and why does it matter?

The REF4132B40DBVRQ1 has a maximum thermal hysteresis of 35 ppm, measured as output voltage deviation after cycling from 25°C → −40°C → +125°C → 25°C. This parameter matters in automotive applications where ECUs undergo repeated thermal cycling (e.g., engine start-stop), as hysteresis introduces non-repeatable offset errors affecting sensor calibration validity across service life.

Can the REF4132B40DBVRQ1 be used to generate a negative reference voltage?

Yes, the REF4132B40DBVRQ1 can generate a negative reference when paired with an op amp such as the OPA735, as shown in TI's reference design SNAS795A Figure 27. In that configuration, REF4132B40DBVRQ1 provides the +2.5 V node, and the OPA735 inverts and buffers to produce −2.5 V. Matching R1/R2 temperature coefficients is essential to preserve common-mode rejection across temperature.