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

Texas Instruments REF4132B33DBVRQ1

Name: REF4132B33DBVRQ1
Brand: Texas Instruments
SKU: REF4132B33DBVRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: REF4132B33DBVRQ1

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: SC-74A, SOT-753

Datasheet:: REF4132B33DBVRQ1.pdf

Description:: IC VREF SERIES 0.05% SOT23-5

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Product details

Overview

REF4132B33DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, low-drift (30 ppm/°C max), low-power (100 µA max) series voltage reference delivering a precise 3.3 V output with ±0.05% initial accuracy and ±10 mA sourcing/sinking capability. It operates across −40°C to +125°C and is used in high-reliability ADAS front camera and traction inverter reference circuits.

For engineers reviewing the REF4132B33DBVRQ1 datasheet, REF4132B33DBVRQ1 pinout, REF4132B33DBVRQ1 application, or REF4132B33DBVRQ1 equivalent, key selection criteria include dropout voltage at 10 mA (500 mV), 0.1–10 Hz noise (15 µV_PP), thermal hysteresis (35 ppm), long-term stability (30 ppm/1000 hrs), and enable-pin logic thresholds (1.6 V high / 0.5 V low).

Technical Context

The REF4132B33DBVRQ1 implements a precision CMOS bandgap core with integrated output buffer and enable-controlled shutdown mode. Its architecture supports stable operation with 0.1–10 µF capacitive loads and maintains accuracy under line regulation (≤15 ppm/V) and load regulation (≤120 ppm/mA) across temperature.

It features a dedicated EN pin for active-high control, a no-connect (N/C) pin for package compatibility, and a GND-referenced VIN-to-VREF topology optimized for low-dropout performance (50 mV typical at zero load). The device's thermal hysteresis and solder heat shift are characterized per AEC-Q100 requirements for automotive deployment.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.3 V nominal; enables accurate ADC biasing and sensor excitation in 3.3 V systems.
Initial Accuracy	±0.05% max; reduces calibration overhead in high-resolution data acquisition.
Temp Coefficient	30 ppm/°C max (B grade); ensures ≤3.9 ppm drift over −40°C to +125°C operating range.
Quiescent Current	100 µA max active / 5 µA max shutdown; supports always-on automotive modules with ultra-low standby power.
Dropout Voltage	500 mV max at 10 mA load; allows operation from 3.8 V supply in battery-sag conditions.
Output Noise	15 µV_PP (0.1–10 Hz); preserves SNR in 20+ bit SAR and delta-sigma converters.
Long-Term Stability	30 ppm/1000 hrs; minimizes recalibration frequency in safety-critical ECU subsystems.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
1 - N/C	No-connect	Internally unconnected; must remain floating-no external tie or trace.
2 - GND	Ground reference	Primary return path for VIN, VREF, and EN; requires low-impedance solid ground plane.
3 - EN	Enable control input	Active-high digital input; ≥1.6 V enables output, ≤0.5 V disables output to high-Z state.
4 - VIN	Input supply	Accepts 3.35 V to 5.5 V; supplies internal bandgap and buffer; bypass with 0.1 µF ceramic.
5 - VREF	Precision output	3.3 V regulated output; capable of ±10 mA; requires 0.1 µF ceramic capacitor for stability.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40°C to +125°C ambient operation in automotive ECUs with HBM ESD ≥±2500 V.
Low-output hysteresis	35 ppm max thermal hysteresis ensures repeatable reference voltage after temperature cycling.
Shutdown mode	Reduces quiescent current to ≤5 µA, enabling power-gating in sleep-state vehicle networks.
Capacitive load tolerance	Stable with 0.1–10 µF output capacitance-supports robust filtering without oscillation risk.
Pin-to-pin replacement	Direct drop-in for LM4132-Q1 and LM4128-Q1 in existing SOT-23-5 layouts.

Applications

ADAS Front Camera	Automotive DC/DC Converter
Use Scenario: Provides stable 3.3 V reference for image signal processor (ISP) ADCs and analog front-end comparators in forward-facing collision avoidance systems. IC Role / Device Role / Timing Role: Precision voltage reference for analog-to-digital conversion and sensor biasing; not a timing or clocking function. Use Value: ±0.05% initial accuracy and 30 ppm/°C drift maintain <0.5 LSB error in 16-bit imaging ADCs across full automotive temperature range.	Use Scenario: Supplies reference voltage to feedback loop error amplifiers and PWM controllers in 12 V to 3.3 V/5 V automotive buck converters. IC Role / Device Role / Timing Role: Stable DC reference for closed-loop regulation; enables tight output voltage tolerance (<±1%) under dynamic load transients. Use Value: 15 µV_PP low-frequency noise prevents ripple-induced jitter in control loop sampling, improving transient response fidelity.
Traction Inverter Control	HEV/EV On-Board Charger
Use Scenario: References current-sense amplifiers and isolation amplifier inputs monitoring motor phase currents in IGBT/SiC gate driver subsystems. IC Role / Device Role / Timing Role: High-stability analog reference for isolated current measurement chains; immune to EMI from high dv/dt switching nodes. Use Value: 30 ppm/1000 hrs long-term stability avoids drift-induced torque estimation errors during extended vehicle operation.	Use Scenario: Supplies reference to isolated ADCs measuring AC grid voltage, DC bus voltage, and battery pack cell voltages in bidirectional OBC systems. IC Role / Device Role / Timing Role: Primary system reference for multi-channel, high-accuracy energy metering and safety monitoring functions. Use Value: AEC-Q100 qualification and −40°C to +125°C operation ensure reliability in under-hood OBC enclosures with minimal derating.

ADAS Front Camera

Automotive DC/DC Converter

Use Scenario: Provides stable 3.3 V reference for image signal processor (ISP) ADCs and analog front-end comparators in forward-facing collision avoidance systems.

IC Role / Device Role / Timing Role: Precision voltage reference for analog-to-digital conversion and sensor biasing; not a timing or clocking function.

Use Value: ±0.05% initial accuracy and 30 ppm/°C drift maintain <0.5 LSB error in 16-bit imaging ADCs across full automotive temperature range.

Use Scenario: Supplies reference voltage to feedback loop error amplifiers and PWM controllers in 12 V to 3.3 V/5 V automotive buck converters.

IC Role / Device Role / Timing Role: Stable DC reference for closed-loop regulation; enables tight output voltage tolerance (<±1%) under dynamic load transients.

Use Value: 15 µV_PP low-frequency noise prevents ripple-induced jitter in control loop sampling, improving transient response fidelity.

Traction Inverter Control

HEV/EV On-Board Charger

Use Scenario: References current-sense amplifiers and isolation amplifier inputs monitoring motor phase currents in IGBT/SiC gate driver subsystems.

IC Role / Device Role / Timing Role: High-stability analog reference for isolated current measurement chains; immune to EMI from high dv/dt switching nodes.

Use Value: 30 ppm/1000 hrs long-term stability avoids drift-induced torque estimation errors during extended vehicle operation.

Use Scenario: Supplies reference to isolated ADCs measuring AC grid voltage, DC bus voltage, and battery pack cell voltages in bidirectional OBC systems.

IC Role / Device Role / Timing Role: Primary system reference for multi-channel, high-accuracy energy metering and safety monitoring functions.

Use Value: AEC-Q100 qualification and −40°C to +125°C operation ensure reliability in under-hood OBC enclosures with minimal derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4132B33QDBVRQ1	Same 3.3 V output, but higher tempco (50 ppm/°C max) and lower initial accuracy (±0.1%).	Lacks REF4132B33DBVRQ1's low-noise (15 µV_PP) and enhanced long-term stability (30 ppm/1000 hrs vs 50 ppm/1000 hrs).	Choose when cost sensitivity outweighs noise and stability requirements in non-safety-critical modules.
MAX6033BAUT33+T	3.3 V, ±0.06% initial accuracy, 20 ppm/°C tempco-but not AEC-Q100 qualified and rated only to +85°C.	Not suitable for under-hood or ADAS applications requiring Grade 1 automotive qualification.	Select only for non-automotive industrial or commercial designs where extended temperature and qualification are unnecessary.

Compared with LM4132B33QDBVRQ1 and MAX6033BAUT33+T, REF4132B33DBVRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 30 ppm/°C tempco, 15 µV_PP noise, and 30 ppm/1000 hrs stability-making it the only option qualified for safety-critical ADAS and traction inverter reference roles.

Availability

REF4132B33DBVRQ1 is available at Aetrix Electronics and suitable for ADAS front camera, traction inverter, and HEV/EV on-board charger applications requiring stable component supply, automotive-grade lifecycle assurance, and traceable sourcing.

Supply support for REF4132B33DBVRQ1 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, power management, and automotive ICs.

The REF4132-Q1 product line delivers high-accuracy, low-drift voltage references engineered specifically for automotive ADAS, powertrain, and electrification systems demanding AEC-Q100 qualification and long-term reliability.

FAQ

What is the maximum load current supported by the REF4132B33DBVRQ1?

The REF4132B33DBVRQ1 supports ±10 mA output current-capable of both sourcing and sinking up to 10 mA while maintaining specified accuracy and dropout performance. At 10 mA load, dropout voltage is guaranteed ≤500 mV, and output voltage remains within ±0.05% initial accuracy across −40°C to +125°C. Short-circuit current is internally limited to 18 mA for protection.

Does the REF4132B33DBVRQ1 require an external output capacitor?

Yes, the REF4132B33DBVRQ1 requires a minimum 0.1 µF ceramic capacitor directly at the VREF pin for stability. TI recommends X5R or X7R dielectrics with low ESR/ESL. An additional 1–10 µF capacitor may be added in parallel to improve transient response, though this increases turn-on time. Output capacitance outside the 0.1–10 µF range risks instability or degraded noise performance.

What is the enable pin behavior of the REF4132B33DBVRQ1?

The EN pin of the REF4132B33DBVRQ1 is active-high: output is enabled when EN ≥1.6 V and disabled (high-Z) when EN ≤0.5 V. Between these thresholds (0.5–1.6 V), supply current rises unpredictably and startup may fail. In shutdown mode, quiescent current drops to ≤5 µA. If unused, EN must be tied directly to VIN-not left floating-to ensure reliable operation.

Is the REF4132B33DBVRQ1 pin-compatible with other voltage references?

Yes, the REF4132B33DBVRQ1 is pin-to-pin compatible with LM4132-Q1 and LM4128-Q1 in the SOT-23-5 (DBV) package. Pin mapping (N/C, GND, EN, VIN, VREF) matches exactly, allowing direct replacement without PCB changes. This compatibility extends to footprint, thermal pad absence, and mechanical dimensions (2.90 mm × 1.60 mm).

How does the REF4132B33DBVRQ1 perform in terms of long-term stability?

The REF4132B33DBVRQ1 exhibits 30 ppm maximum long-term stability over 1000 hours at 35°C, measured per JEDEC JESD22-A117. This value reflects typical drift in production units and supports extended calibration intervals in automotive ECUs. Note that long-term stability is statistical-not guaranteed-and may vary with operating temperature, voltage stress, and PCB thermal environment.

REF4132B33DBVRQ1 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:: 30ppm/°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

REF4132B33DBVRQ1 FAQ

1.How can I place an order for REF4132B33DBVRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for REF4132B33DBVRQ1 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 REF4132B33DBVRQ1 reliable?

The price and inventory of REF4132B33DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF4132B33DBVRQ1 is usually 5 days.

3.What payment methods are accepted for REF4132B33DBVRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF4132B33DBVRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for REF4132B33DBVRQ1?

REF4132B33DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your REF4132B33DBVRQ1 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 REF4132B33DBVRQ1?

For technical support, including REF4132B33DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF4132B33DBVRQ1 requirements.

6.How does Aetrix verify that REF4132B33DBVRQ1 is sourced from the original manufacturer or authorized distributors?

All REF4132B33DBVRQ1 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 REF4132B33DBVRQ1 meets industry standards.

7.What is the process for return or replacement of REF4132B33DBVRQ1?

All REF4132B33DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF4132B33DBVRQ1, 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 REF4132B33DBVRQ1 part is unused and in its original packaging.

Return procedure for REF4132B33DBVRQ1:

1.Submit a request within 90 days.

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

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