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

Nexperia USA Inc. TLVH431NACDBZR-QR

Name: TLVH431NACDBZR-QR
Brand: Nexperia USA Inc.
SKU: TLVH431NACDBZR-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLVH431NACDBZR-QR

Manufacturer:: Nexperia USA Inc.

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: TLVH431NACDBZR-QR.pdf

Description:: IC VREF SHUNT 1.24V SOT23-3

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Inventory:3,735

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Product details

Overview

TLVH431NACDBZR-Q from Nexperia is an A-grade (±1.0 %) adjustable precision shunt regulator in SOT23 package, delivering 1.24 V reference voltage with 0.1 Ω dynamic cathode-anode impedance and sink current capability from 80 µA to 70 mA. It operates across -40 °C to 125 °C, qualified to AEC-Q100 Grade 1, and functions as a programmable voltage reference in isolated SMPS feedback loops.

For engineers reviewing the TLVH431NACDBZR-Q datasheet, TLVH431NACDBZR-Q pinout, TLVH431NACDBZR-Q application, or TLVH431NACDBZR-Q equivalent, this device supports precision current limiting, shunt regulation, and automotive-grade feedback control where tight reference tolerance and low output impedance are critical.

Technical Context

The TLVH431NACDBZR-Q implements a three-terminal shunt topology with internal bandgap reference and active error amplifier, enabling programmable output voltages from 1.24 V to 14 V via two external resistors. Its sharp turn-on characteristic and 0.1 Ω typical Z_KA support stable regulation under dynamic load conditions.

It features A-grade reference voltage tolerance (1228–1252 mV at 25 °C), low reference current (0.19–0.30 µA), and thermal stability optimized for automotive ambient ranges (−40 °C to +125 °C), with specified ΔV_ref/ΔT of ≤ ±2.2 mV over full temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference voltage	1240 mV ±1.0 % (A-grade); sets precise threshold for feedback or current-sense circuits
Cathode current range	80 µA to 70 mA; enables operation from ultra-low-power biasing to high-current shunt regulation
Dynamic impedance	0.10 Ω typical; ensures minimal output voltage deviation during fast load transients
Temperature range	−40 °C to +125 °C; supports under-hood automotive and industrial environments without derating
Output voltage range	1.24 V to 14 V (programmable); allows flexible design of regulated rails or current sources
AEC-Q100 qualification	Grade 1 qualified; validated for automotive powertrain and body electronics applications
Package	SOT23 (TO-236AB); surface-mount compatible with standard reflow profiles and compact PCB layouts

Pinout & Package

SOT23 (TO-236AB) package with normal pinning configuration: 3-pin plastic surface-mounted outline, 1.9 mm × 1.1 mm footprint, 0.95 mm height, and standard reflow-compatible solder lands per Figure 30.

Pin/Terminal	Circuit Role	Design Meaning
1 - REF	Reference input	High-impedance node sensing external resistor divider; sets regulation point with <0.3 µA bias current
2 - K	Cathode	Current-sink output terminal; carries full load/sink current up to 70 mA with <0.1 Ω effective impedance
3 - A	Anode	Return path to system ground or negative rail; forms cathode-anode voltage (V_KA) across which regulation occurs

Key Features

Feature	Design Value
Programmable output voltage	1.24 V to 14 V using two external resistors; eliminates need for multiple fixed-voltage regulators
A-grade reference tolerance	±1.0 % at 25 °C; reduces calibration overhead in precision feedback and current-limit designs
Low dynamic impedance	0.10 Ω typical; maintains regulation accuracy during rapid current changes in SMPS feedback paths
Automotive qualification	AEC-Q100 Grade 1 compliant; guarantees reliability in engine control, ADAS, and infotainment systems
Low reference current	0.19–0.30 µA; minimizes resistor-divider power loss and improves efficiency in battery-powered circuits

Applications

Shunt Regulator

Precision Current Sink

Use Scenario: Stabilizing 5 V or 3.3 V rail in automotive microcontroller power domain using external resistive divider and series pass transistor.

IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference to control base/gate of series pass element.

Use Value: Maintains ±1 % output accuracy over −40 °C to +125 °C without trimming, reducing BOM count vs. fixed LDOs.

Use Scenario: Driving LED strings in automotive interior lighting with constant current independent of supply variation.

IC Role / Device Role / Timing Role: Precision current sink controlling LED current via sense resistor and REF/K/A terminals.

Use Value: Delivers stable 100 mA sink with <0.1 Ω impedance, eliminating thermal drift-induced brightness shifts.

Isolated SMPS Feedback

Precision Current Limiter

Use Scenario: Secondary-side voltage sensing in flyback converter for USB-C PD adapter, feeding optocoupler input.

IC Role / Device Role / Timing Role: Adjustable shunt reference generating error signal proportional to output voltage deviation.

Use Value: Enables <1 % output regulation accuracy across line/load/temperature with minimal component count.

Use Scenario: Protecting 12 V CAN transceiver interface against short-circuit faults by limiting fault current to 250 mA.

IC Role / Device Role / Timing Role: Adjustable current limiter clamping sink current via REF/K/A configuration and sense resistor.

Use Value: Provides repeatable 250 mA trip threshold with ±1 % tolerance, avoiding thermal shutdown delays.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431ACDBZR	Commercial-grade (−40 °C to +85 °C), 1.5 % V_ref tolerance, non-AEC-Q100	Not qualified for automotive use; suitable only for industrial/commercial power supplies	Select when AEC-Q100 and extended temperature are not required; lower cost alternative
TL431ACDR	TI part with 2.495 V nominal V_ref, 2 % tolerance, SO-8 package, no AEC-Q100 grade	Fixed 2.495 V reference; requires different resistor scaling; larger footprint and higher thermal resistance	Choose if legacy TI design compatibility is needed; avoid for new automotive designs due to tolerance and qualification gaps

Compared with TLVH431ACDBZR and TL431ACDR, the TLVH431NACDBZR-Q offers tighter 1.0 % reference tolerance, guaranteed −40 °C to +125 °C operation, and AEC-Q100 Grade 1 qualification-making it uniquely suited for next-generation automotive feedback and protection circuits where precision and reliability are non-negotiable.

Availability

TLVH431NACDBZR-Q is available at Aetrix Electronics and suitable for automotive powertrain control, isolated DC-DC converters, and precision current-limiting circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLVH431NACDBZR-Q 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

The TLVH431N-Q family targets automotive-grade precision analog regulation, designed specifically to replace Zener diodes in safety-critical feedback, current sensing, and voltage monitoring applications demanding AEC-Q100 compliance and tight parametric control.

FAQ

What is the minimum cathode current required for regulation?

The TLVH431NACDBZR-Q requires a minimum cathode current (I_K(min)) of 55 µA to maintain regulation, verified across −40 °C to +125 °C. This value ensures stable operation even in ultra-low-power bias networks where resistor dividers draw minimal current, and is significantly lower than legacy TL431 variants.

How does the mirrored pinning variant differ from TLVH431NACDBZR-Q?

TLVH431NACDBZR-Q uses normal SOT23 pinning (Pin 1 = REF, Pin 2 = K, Pin 3 = A). Mirrored variants like TLVH431NAMQDBZR-Q swap REF and K (Pin 1 = K, Pin 2 = REF), requiring PCB layout revision. Pinout mismatch causes functional failure-no electrical compatibility exists between normal and mirrored versions.

Can TLVH431NACDBZR-Q replace TL431 in existing designs?

Yes, with circuit adjustments: TLVH431NACDBZR-Q has 1.24 V reference (vs. TL431's 2.495 V), requiring resistor divider recalculations. Its lower V_ref, tighter tolerance, and AEC-Q100 qualification make it superior for new automotive designs-but direct drop-in replacement is not possible without modifying feedback network values.

What is the maximum power dissipation at 85 °C ambient?

At T_amb = 85 °C, maximum power dissipation is derated to approximately 420 mW on FR4 PCB with standard footprint (based on R_th(j-a) = 360 K/W and T_j(max) = 150 °C). This assumes no copper pour enhancement; adding 1 cm² anode pad increases limit to ~680 mW per datasheet Figure 2 curve (2).

TLVH431NACDBZR-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Adjustable

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

Voltage - Output (Max):: 14 V

Current - Output:: 70 mA

Tolerance:: ±1%

Temperature Coefficient:: -

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 80 µA

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

TLVH431NACDBZR-QR FAQ

1.How can I place an order for TLVH431NACDBZR-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for TLVH431NACDBZR-QR 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 TLVH431NACDBZR-QR reliable?

The price and inventory of TLVH431NACDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431NACDBZR-QR is usually 5 days.

3.What payment methods are accepted for TLVH431NACDBZR-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431NACDBZR-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLVH431NACDBZR-QR?

TLVH431NACDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLVH431NACDBZR-QR 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 TLVH431NACDBZR-QR?

For technical support, including TLVH431NACDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431NACDBZR-QR requirements.

6.How does Aetrix verify that TLVH431NACDBZR-QR is sourced from the original manufacturer or authorized distributors?

All TLVH431NACDBZR-QR 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 TLVH431NACDBZR-QR meets industry standards.

7.What is the process for return or replacement of TLVH431NACDBZR-QR?

All TLVH431NACDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431NACDBZR-QR, 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 TLVH431NACDBZR-QR part is unused and in its original packaging.

Return procedure for TLVH431NACDBZR-QR:

1.Submit a request within 90 days.

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

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