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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Texas Instruments REF4132A33DBVRQ1

Name: REF4132A33DBVRQ1
Brand: Texas Instruments
SKU: REF4132A33DBVRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: REF4132A33DBVRQ1

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: SC-74A, SOT-753

Datasheet:: REF4132A33DBVRQ1.pdf

Description:: IC VREF SERIES 0.05% SOT23-5

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Product details

Overview

REF4132A33DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified precision series voltage reference delivering 3.3 V output with ±0.05% initial accuracy, 12 ppm/°C max temperature coefficient (A grade), and ±10 mA output current capability in a 5-pin SOT-23 package. It operates from −40°C to +125°C and supports high-resolution ADCs in ADAS front camera and traction inverter systems.

For engineers reviewing the REF4132A33DBVRQ1 datasheet, REF4132A33DBVRQ1 pinout, REF4132A33DBVRQ1 application, or REF4132A33DBVRQ1 equivalent, key selection criteria include dropout voltage (≤100 mV at 0 mA), low-frequency noise (15 µV_PP), quiescent current (≤100 µA), thermal hysteresis (≤35 ppm), and enable-controlled shutdown mode.

Technical Context

The REF4132A33DBVRQ1 implements a CMOS-based bandgap core with integrated output buffer and enable logic, supporting active and shutdown modes via the EN pin. Its architecture achieves low 1/f noise and minimal thermal hysteresis through matched die layout and stress-compensated design.

It features a 50–100 mV dropout voltage at zero load, maintains line regulation ≤2 ppm/V and load regulation ≤20 ppm/mA, and sustains stable operation with output capacitors from 0.1 µF to 10 µF - enabling use in space-constrained automotive sensor signal chains and isolated power domains.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.3 V nominal; enables direct interface with 3.3-V SAR and delta-sigma ADCs without level-shifting.
Initial Accuracy	±0.05% max at 25°C; reduces calibration burden in factory-trimmed automotive ECUs.
Temp Coefficient	12 ppm/°C max (A grade); ensures <±0.33 mV drift over −40°C to +125°C operating range.
Quiescent Current	≤100 µA max; supports always-on subsystems in battery-backed ADAS modules.
Dropout Voltage	100 mV max at 0 mA; allows operation from 3.4 V supply in 3.3-V rail-limited environments.
Low-Freq Noise	15 µV_PP (0.1–10 Hz); preserves ENOB in 24-bit precision data acquisition for motor control feedback.
Long-Term Drift	30 ppm/1000 hrs; supports 15-year functional safety compliance in ASIL-B systems.

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm body size), surface-mount, RoHS-compliant, automotive-grade molding compound.

Pin/Terminal	Circuit Role	Design Meaning
1 - N/C	No-connect	Internally unconnected; must remain floating per datasheet - no PCB trace or pull-up/down.
2 - GND	Ground reference	Primary return path for reference core and buffer; requires low-impedance connection to solid ground plane.
3 - EN	Enable control input	Active-high digital control: ≥1.6 V enables output; ≤0.5 V disables output and reduces IQ to ≤5 µA.
4 - VIN	Input supply	Accepts 3.4 V to 5.5 V; dropout headroom as low as 100 mV enables use with LDO-fed rails.
5 - VREF	Precision output	3.3 V buffered reference source capable of sourcing/sinking ±10 mA with <15 µV_PP noise.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40°C to +125°C ambient operation with HBM ESD ≥±2500 V - suitable for under-hood ECUs.
Enable-controlled shutdown	Reduces quiescent current to ≤5 µA while placing VREF in high-impedance state - ideal for duty-cycled sensor nodes.
Low thermal hysteresis	≤35 ppm output shift after −40°C → +125°C → 25°C cycling - critical for repeatable calibration in ADAS perception stacks.
Stable with ceramic output caps	Operates reliably with 0.1 µF to 10 µF X7R/X5R ceramics - eliminates need for tantalum or electrolytic capacitors in compact layouts.
High PSRR	≥60 dB rejection up to 10 kHz - suppresses switching noise from DC/DC converters feeding VIN.

Applications

ADAS Front Camera	Traction Inverter Control
Use Scenario: High-dynamic-range image sensor biasing and ADC reference in 8-MP automotive camera modules. IC Role / Device Role / Timing Role: Primary 3.3 V precision reference for 16-bit analog front-end and timing-critical pixel readout clocking. Use Value: 12 ppm/°C drift and 15 µV_PP noise maintain >92 dB SNR across full temperature range, meeting ISO 26262 ASIL-B requirements.	Use Scenario: Reference for current-sense amplifiers and isolation barrier drivers in 400-V battery-fed inverters. IC Role / Device Role / Timing Role: Stable 3.3 V reference for shunt-based phase current measurement and gate driver biasing. Use Value: ≤100 mV dropout enables direct use from 3.4 V auxiliary supply; 30 ppm/1000 hrs long-term stability minimizes recalibration frequency.
Automotive DC/DC Converter	HEV/EV On-Board Charger (OBC)
Use Scenario: Feedback reference for isolated flyback or forward converter regulating 12 V auxiliary rail. IC Role / Device Role / Timing Role: Secondary-side voltage reference in optocoupler- or digital-isolator-based feedback loop. Use Value: ±0.05% initial accuracy improves output regulation tolerance to ±0.5%; EN pin enables synchronized startup with primary controller.	Use Scenario: Reference for bidirectional AC/DC and DC/DC stages in 6.6 kW OBC with SiC MOSFETs. IC Role / Device Role / Timing Role: Precision reference for grid-synchronization ADCs and battery-voltage monitoring circuits. Use Value: −40°C to +125°C operation supports under-hood mounting; low IQ extends standby-time compliance for EU energy regulations.

ADAS Front Camera

Traction Inverter Control

Use Scenario: High-dynamic-range image sensor biasing and ADC reference in 8-MP automotive camera modules.

IC Role / Device Role / Timing Role: Primary 3.3 V precision reference for 16-bit analog front-end and timing-critical pixel readout clocking.

Use Value: 12 ppm/°C drift and 15 µV_PP noise maintain >92 dB SNR across full temperature range, meeting ISO 26262 ASIL-B requirements.

Use Scenario: Reference for current-sense amplifiers and isolation barrier drivers in 400-V battery-fed inverters.

IC Role / Device Role / Timing Role: Stable 3.3 V reference for shunt-based phase current measurement and gate driver biasing.

Use Value: ≤100 mV dropout enables direct use from 3.4 V auxiliary supply; 30 ppm/1000 hrs long-term stability minimizes recalibration frequency.

Automotive DC/DC Converter

HEV/EV On-Board Charger (OBC)

Use Scenario: Feedback reference for isolated flyback or forward converter regulating 12 V auxiliary rail.

IC Role / Device Role / Timing Role: Secondary-side voltage reference in optocoupler- or digital-isolator-based feedback loop.

Use Value: ±0.05% initial accuracy improves output regulation tolerance to ±0.5%; EN pin enables synchronized startup with primary controller.

Use Scenario: Reference for bidirectional AC/DC and DC/DC stages in 6.6 kW OBC with SiC MOSFETs.

IC Role / Device Role / Timing Role: Precision reference for grid-synchronization ADCs and battery-voltage monitoring circuits.

Use Value: −40°C to +125°C operation supports under-hood mounting; low IQ extends standby-time compliance for EU energy regulations.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4132AMF-3.3/NOPB	Same 3.3 V output and SOT-23-5 package, but B-grade tempco (30 ppm/°C) and ±0.1% initial accuracy.	Lacks AEC-Q100 qualification; not approved for automotive safety-critical functions.	Select only for non-automotive industrial or consumer designs where cost sensitivity outweighs drift and qualification requirements.
MAX6033AEUR+T	3.3 V output, ±0.06% initial accuracy, 15 ppm/°C tempco, but 6-pin SOT-23 package and no enable pin.	Higher noise (20 µV_PP) and no shutdown mode - unsuitable for low-power ADAS subsystems.	Consider only when board space permits 6-pin footprint and enable functionality is unnecessary.

Compared with LM4132AMF-3.3/NOPB and MAX6033AEUR+T, REF4132A33DBVRQ1 delivers tighter initial accuracy, lower drift, automotive qualification, and active-low enable - making it the sole choice for ASIL-B-compliant reference paths in HEV/EV powertrain and vision systems.

Availability

REF4132A33DBVRQ1 is available at Aetrix Electronics and suitable for ADAS front camera, traction inverter control, and automotive DC/DC converter applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for REF4132A33DBVRQ1 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 and automotive-grade components.

The REF4132-Q1 product line was designed specifically for high-accuracy, low-drift voltage referencing in automotive safety-critical systems - targeting ADAS, powertrain, and electrification applications demanding AEC-Q100 Grade 1 reliability.

FAQ

What is the maximum allowable input voltage for REF4132A33DBVRQ1?

The absolute maximum input voltage (VIN) for REF4132A33DBVRQ1 is 6 V, but the recommended operating maximum is 5.5 V. Exceeding 5.5 V risks violating absolute maximum ratings and may degrade long-term stability or cause permanent damage. The device operates down to VIN = VREF + VDO (≥3.4 V for 3.3 V output), with optimal performance between 3.4 V and 5.5 V.

Does REF4132A33DBVRQ1 support negative reference generation?

REF4132A33DBVRQ1 itself provides only a positive 3.3 V reference output. However, it can be used with an external op amp such as OPA735 in an inverting configuration to generate a matched negative reference - as shown in TI's official reference design SNAS795A Figure 27. This dual-rail approach relies on resistor matching and thermal coupling to preserve accuracy.

What is the typical turn-on time for REF4132A33DBVRQ1 after enabling?

The typical turn-on time for REF4132A33DBVRQ1 is 2.5 ms to 0.1% settling with a 1 µF output capacitor. This value increases with larger output capacitance - e.g., ~10 ms with 10 µF - due to RC time constant effects. For fast wake-up systems, TI recommends using ≤1 µF ceramic output capacitance and verifying transient response in the target application.

Can REF4132A33DBVRQ1 drive a 10 µF ceramic capacitor directly?

Yes, REF4132A33DBVRQ1 is explicitly characterized and specified for stable operation with output capacitors from 0.1 µF to 10 µF, including X5R and X7R ceramic types. No external series resistance is required. TI confirms stability across this range in SNAS795A Section 7.5 and Figure 10–13 load transient waveforms.

Is REF4132A33DBVRQ1 pin-compatible with LM4132-Q1?

Yes, REF4132A33DBVRQ1 is a pin-to-pin replacement for LM4132-Q1 in the same SOT-23-5 (DBV) package, sharing identical pinout (N/C, GND, EN, VIN, VREF) and footprint. TI explicitly states this in the datasheet description: "Packaged in the same SOT-23-5 package, REF4132-Q1 offers enhanced specifications and pin-to-pin replacement for LM4132-Q1."

REF4132A33DBVRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: SC-74A, SOT-753

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Series

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Current - Output:: 10 mA

Tolerance:: ±0.05%

Temperature Coefficient:: 12ppm/°C

Noise - 0.1Hz to 10Hz:: 15µVp-p

Noise - 10Hz to 10kHz:: 24µVrms

Voltage - Input:: 3.35V ~ 5.5V

Current - Supply:: 100µA

Current - Cathode:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

REF4132A33DBVRQ1 FAQ

1.How can I place an order for REF4132A33DBVRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for REF4132A33DBVRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for REF4132A33DBVRQ1 reliable?

The price and inventory of REF4132A33DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF4132A33DBVRQ1 is usually 5 days.

3.What payment methods are accepted for REF4132A33DBVRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF4132A33DBVRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for REF4132A33DBVRQ1?

REF4132A33DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your REF4132A33DBVRQ1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for REF4132A33DBVRQ1?

For technical support, including REF4132A33DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF4132A33DBVRQ1 requirements.

6.How does Aetrix verify that REF4132A33DBVRQ1 is sourced from the original manufacturer or authorized distributors?

All REF4132A33DBVRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that REF4132A33DBVRQ1 meets industry standards.

7.What is the process for return or replacement of REF4132A33DBVRQ1?

All REF4132A33DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF4132A33DBVRQ1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The REF4132A33DBVRQ1 part is unused and in its original packaging.

Return procedure for REF4132A33DBVRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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