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

Diodes Incorporated TLV431BQE5TA

Name: TLV431BQE5TA
Brand: Diodes Incorporated
SKU: TLV431BQE5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLV431BQE5TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: SC-74A, SOT-753

Datasheet:: TLV431BQE5TA.pdf

Description:: IC VREF SHUNT 1.24V SC74A

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TLV431BQE5TA from Diodes Incorporated is an AEC-Q100 Grade 1 qualified, 0.5% initial tolerance adjustable shunt voltage reference with 1.24V nominal reference voltage, −40°C to +125°C operating range, and 20mA max cathode current. It replaces Zener diodes in precision automotive voltage monitoring, battery management, and power supply feedback loops where stable low-voltage regulation is required.

For engineers reviewing the TLV431BQE5TA datasheet, TLV431BQE5TA pinout, TLV431BQE5TA application, or TLV431BQE5TA equivalent, this device serves as a high-accuracy, temperature-stable shunt regulator for automotive-grade feedback networks, overvoltage protection circuits, and programmable voltage thresholds requiring ≤6mV VREF deviation across −40°C to +85°C.

Technical Context

The TLV431BQE5TA operates as a three-terminal shunt regulator using an internal bandgap reference and transconductance amplifier to maintain precise voltage at the REF pin via external resistor divider feedback. Its 0.25Ω typical dynamic output impedance ensures minimal load-induced voltage shift under varying cathode current (0.1–15mA).

It features 80µA minimum cathode current for regulation, 4–11mV VREF deviation across temperature ranges, and supports adjustable output from 1.24V to 18V. The SOT25 package integrates die-to-pin-2 thermal path, requiring pin 2 to be left floating or tied to pin 5 per layout guidelines.

Key Specifications

Parameter	Value and Actual Design Meaning
VREF	1.24V nominal; 0.5% initial tolerance (1.234–1.246V at +25°C) enables high-accuracy feedback in closed-loop regulators.
Temp Range	−40°C to +125°C operating ambient; qualified to AEC-Q100 Grade 1 for under-hood automotive use.
VREF Deviation	≤6mV over −40°C to +85°C; ensures <±0.05% output stability in engine control and battery sensing applications.
ZKA	0.25Ω typical dynamic output impedance; minimizes voltage droop during transient load changes in feedback paths.
IKMIN	80µA max minimum cathode current; allows low-power operation in always-on monitoring circuits.
VKA Max	20V cathode-anode rating; supports direct use with 12V/24V automotive rails without external clamping.
IKA Max	±20mA continuous cathode current; enables robust shunt regulation in overvoltage clamp and error amplifier applications.

Pinout & Package

TLV431BQE5TA is housed in a RoHS-compliant SOT25 surface-mount package (3.0mm × 2.8mm × 1.1mm), with pin 2 thermally connected to the die and requiring floating or connection to pin 5 per Diodes' layout guidance.

Pin/Terminal	Circuit Role	Design Meaning
1 - CATHODE	Current sink node	Primary shunt path; sinks variable current to regulate voltage at REF; rated for ±20mA continuous.
2 - ANODE	Reference return / thermal pad	Internally bonded to die substrate; must be left floating or connected to pin 5 to avoid parasitic conduction.
3 - N/C	No internal connection	Unused terminal; no electrical function; must remain unconnected per datasheet.
4 - REF	Feedback input	Sense point for external resistor divider; regulates cathode voltage to maintain 1.24V at this node.
5 - ANODE	Reference return / thermal pad	Redundant anode connection; ties to pin 2 electrically; used for PCB thermal relief and mechanical anchoring.

Key Features

Feature	Design Value
Adjustable reference range	1.24V to 18V via two external resistors; eliminates need for multiple fixed Zeners in multi-rail systems.
Low VREF drift	6mV max deviation over −40°C to +85°C; reduces calibration burden in automotive temperature-critical modules.
High accuracy tolerance	0.5% initial VREF tolerance (TLV431BQ grade); supports ±1% system-level output regulation without trimming.
Low quiescent current	0.15µA typical IREF; enables use in ultra-low-power wake-up monitors and battery-backed circuits.
AEC-Q100 qualification	Grade 1 (−40°C to +125°C), PPAP-capable, manufactured in IATF 16949 facilities; meets automotive change-control requirements.

Applications

Automotive Battery Monitoring

DC-DC Converter Feedback

Use Scenario: Real-time 12V/48V battery voltage tracking in start-stop systems and EV auxiliary power units.

IC Role / Device Role / Timing Role: Shunt reference in resistor-divider network feeding microcontroller ADC or comparator input.

Use Value: 0.5% VREF tolerance and 6mV temp drift ensure <±0.8% total measurement error across full vehicle temperature range.

Use Scenario: Precision feedback node in isolated flyback or forward DC-DC converters for infotainment and ADAS supplies.

IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing optocoupler-based feedback to improve loop stability and reduce component count.

Use Value: 0.25Ω ZKA minimizes gain variation across load transients, improving transient response and reducing output ripple.

Overvoltage Protection Circuit

Programmable Voltage Threshold Detector

Use Scenario: Clamp circuit protecting CAN transceivers and MCU I/O against load-dump surges up to 20V.

IC Role / Device Role / Timing Role: Active shunt element triggered when sensed voltage exceeds set threshold via R1/R2 divider.

Use Value: 20mA cathode current rating and 20V VKA rating allow direct clamping without series limiting resistor in many designs.

Use Scenario: Configurable brown-out or overvoltage detection for microcontroller reset generation in body control modules.

IC Role / Device Role / Timing Role: Reference source for comparator input; threshold set by external resistors to match system voltage margins.

Use Value: 80µA IKMIN enables reliable activation even with high-impedance divider networks, reducing standby power consumption.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV431BQFTA	SOT23 package (smaller footprint, lower thermal mass); same 0.5% tolerance and electrical specs.	Better suited for space-constrained PCBs; reduced θJA (380°C/W vs. 250°C/W) limits power handling in sustained 15mA operation.	Select for compact layouts where thermal dissipation <330mW is sufficient and board area is critical.
TLVH431BQDBVR	Texas Instruments part; 1.24V reference, 0.5% tolerance, SOT23-5 package; higher 25mA IKMAX and 0.2Ω ZKA.	Supports higher shunt current and lower impedance in high-precision feedback; not AEC-Q100 qualified.	Select only for non-automotive industrial applications requiring tighter impedance or higher current capability.

Compared with TLV431BQE5TA, the SOT23 TLV431BQFTA trades thermal performance for size, while TLVH431BQDBVR offers superior electrical specs but lacks automotive qualification-making TLV431BQE5TA the sole choice for AEC-Q100-compliant, thermally robust shunt regulation in production vehicles.

Availability

TLV431BQE5TA is available at Aetrix Electronics and suitable for automotive battery monitoring, DC-DC converter feedback, and overvoltage protection circuits requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TLV431BQE5TA 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

Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices, with design and manufacturing facilities certified to IATF 16949 for automotive-grade components.

The TLV431Q series is engineered specifically for automotive voltage reference and regulation applications, delivering AEC-Q100-compliant performance in harsh environments with tight tolerance, low drift, and robust thermal design.

FAQ

What is the maximum cathode-anode voltage (VKA) rating for TLV431BQE5TA?

The absolute maximum cathode-anode voltage is 20V, as specified in the Absolute Maximum Ratings table. This allows direct use with 12V and 24V automotive supply rails without additional clamping components, provided power dissipation remains within the 500mW limit of the SOT25 package at +25°C ambient.

Can TLV431BQE5TA replace a standard Zener diode in existing designs?

Yes-it functions as a 3-terminal active Zener replacement with superior temperature stability (6mV drift over −40°C to +85°C vs. typical Zener's >20mV), tighter initial tolerance (0.5% vs. 5–10%), and adjustable output (1.24–18V). External resistor selection determines the regulated voltage, and pin compatibility requires verifying SOT25 footprint alignment with legacy Zener footprints.

Why must pin 2 be left floating or connected to pin 5 in the SOT25 package?

Per Diodes' package documentation, pin 2 is electrically bonded to the die substrate in the SOT25 variant. Leaving it unconnected or tying it to pin 5 prevents unintended current paths and thermal coupling issues. Failure to observe this causes unpredictable regulation behavior and potential thermal runaway due to parasitic conduction through the substrate bond wire.

Is TLV431BQE5TA suitable for use in feedback loops of isolated power supplies?

Yes-its low 0.25Ω dynamic output impedance and 0.15µA reference input current minimize loading effects on optocoupler secondary-side feedback networks. Combined with AEC-Q100 qualification, it enables robust, high-accuracy regulation in isolated automotive DC-DC converters where reliability across temperature and lifetime is mandatory.

TLV431BQE5TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Adjustable

Voltage - Output (Min/Fixed):: 1.24V

Voltage - Output (Max):: 18 V

Current - Output:: 15 mA

Tolerance:: ±0.5%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 100 µA

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-25

TLV431BQE5TA FAQ

1.How can I place an order for TLV431BQE5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for TLV431BQE5TA 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 TLV431BQE5TA reliable?

The price and inventory of TLV431BQE5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BQE5TA is usually 5 days.

3.What payment methods are accepted for TLV431BQE5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431BQE5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLV431BQE5TA?

TLV431BQE5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLV431BQE5TA 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 TLV431BQE5TA?

For technical support, including TLV431BQE5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BQE5TA requirements.

6.How does Aetrix verify that TLV431BQE5TA is sourced from the original manufacturer or authorized distributors?

All TLV431BQE5TA 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 TLV431BQE5TA meets industry standards.

7.What is the process for return or replacement of TLV431BQE5TA?

All TLV431BQE5TA units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BQE5TA, 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 TLV431BQE5TA part is unused and in its original packaging.

Return procedure for TLV431BQE5TA:

1.Submit a request within 90 days.

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

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