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

STMicroelectronics TLVH431BIL3T

Name: TLVH431BIL3T
Brand: STMicroelectronics
SKU: TLVH431BIL3T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLVH431BIL3T

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: TLVH431BIL3T.pdf

Description:: IC VREF SHUNT ADJ 0.25% SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:30,330

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Product details

Overview

TLVH431BIL3T from STMicroelectronics is a precision adjustable shunt voltage reference with 0.25% initial accuracy, 1.24 V to 18 V programmable output, and operation from 100 µA to 60 mA sink current across –40 °C to +125 °C. It delivers 0.22 Ω typical dynamic impedance and 100 ppm/°C max temperature coefficient in SOT23-3L package, used for feedback regulation in isolated DC-DC converters.

For engineers reviewing the TLVH431BIL3T datasheet, TLVH431BIL3T pinout, TLVH431BIL3T application, or TLVH431BIL3T equivalent, key selection criteria include output voltage adjustability, low operating current, thermal stability over industrial temperature range, and SOT23-3L footprint compatibility with space-constrained power supply designs.

Technical Context

The TLVH431BIL3T functions as a 2-terminal (anode/cathode) or 3-terminal (anode/cathode/reference) shunt regulator, where output voltage is set by external resistor divider between cathode and reference pins. Its internal bandgap reference and error amplifier enable precise voltage regulation without external compensation.

It operates in continuous conduction mode with guaranteed regulation down to 100 µA cathode current and supports up to 60 mA sink capability. The device exhibits 0.22 Ω dynamic impedance at 10–60 mA, ensuring stable loop response in feedback networks of flyback and forward converters.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	1.24 V to 18 V - Programmable via external resistive divider; enables single-part support across multiple output rails.
Initial Accuracy	±0.25% at 25 °C - Ensures tight output tolerance without post-manufacturing calibration in battery charger feedback paths.
Temp Coefficient	≤100 ppm/°C - Limits output drift to ±23.5 mV over –40 °C to +125 °C, critical for energy metering references.
Sink Current Range	100 µA to 60 mA - Supports ultra-low-power standby regulation and high-current transient response in SMPS feedback loops.
Dynamic Impedance	0.22 Ω typical - Minimizes AC error contribution in closed-loop control, improving PSRR and load step response.
Operating Temp	–40 °C to +125 °C - Qualified for under-hood automotive power modules and industrial motor drive auxiliary supplies.

Pinout & Package

TLVH431BIL3T is housed in a 3-pin SOT23-3L surface-mount package (JEDEC MO-178AA), with 1.3 mm × 2.9 mm footprint and 1.12 mm height. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference - configured as a 3-terminal shunt regulator when all pins are used, or 2-terminal mode with anode tied to ground.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Cathode)	Regulated output node	Connects to primary-side feedback winding or optocoupler LED anode; sinks current to maintain set voltage.
Pin 2 (Anode)	Ground reference terminal	Typically connected to system ground or return path; defines common reference for voltage divider network.
Pin 3 (Reference)	Feedback input	High-impedance input (2.5 µA typical) that samples divided output voltage; sets regulation point via R1/R2 ratio.

Key Features

Feature	Design Value
Adjustable output voltage	1.24 V to 18 V - Enables reuse across multiple power rail designs without changing BOM, reducing inventory SKUs.
Low operating current	100 µA minimum - Allows regulation in always-on circuits (e.g., battery fuel gauges) without compromising standby life.
0.25% voltage precision	Guaranteed at 25 °C - Eliminates need for trimming in factory programming of portable medical device power supplies.
100 ppm/°C tempco	Max over full range - Maintains <±0.5% output variation in solar inverter auxiliary supplies exposed to ambient extremes.
SOT23-3L package	1.3 mm × 2.9 mm footprint - Fits into <3 mm² PCB area, enabling compact isolated bias supplies on multi-layer server PSU boards.

Applications

Isolated Flyback Converter Feedback

Battery Charger Voltage Regulation

Use Scenario: Primary-side feedback in 5–24 V isolated DC-DC converters using optocoupler-coupled TLVH431BIL3T on secondary side.

IC Role / Device Role / Timing Role: Shunt reference providing precise voltage sampling to drive optocoupler LED; defines regulated output voltage via resistor divider.

Use Value: 0.22 Ω dynamic impedance ensures minimal phase lag in feedback loop, supporting >500 kHz switching frequencies without instability.

Use Scenario: Constant-voltage stage in Li-ion battery chargers with 4.2 V ±0.5% output tolerance requirement.

IC Role / Device Role / Timing Role: Precision shunt reference in linear or buck converter feedback network, setting charge termination voltage.

Use Value: ±0.25% initial accuracy and ≤100 ppm/°C tempco meet JEITA charging spec limits across –10 °C to +45 °C ambient.

Industrial Data Acquisition Reference

Energy Management System Monitoring

Use Scenario: Stable 2.5 V or 5 V reference for 16-bit SAR ADCs in PLC analog input modules.

IC Role / Device Role / Timing Role: Low-noise (30 µV_RMS) voltage reference supplying excitation to precision resistor dividers and ADC reference inputs.

Use Value: 100 µA min operating current allows direct connection to microcontroller GPIO-driven bias networks, eliminating LDO overhead.

Use Scenario: Voltage monitoring node in smart meter auxiliary power supply detecting brownout conditions below 10 V.

IC Role / Device Role / Timing Role: Adjustable shunt clamp regulating auxiliary rail while signaling undervoltage via cathode current change to MCU comparator.

Use Value: 60 mA sink capability enables direct driving of status LEDs or opto-isolators during fault events without external transistor.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIL3T	0.5% initial accuracy, same SOT23-3L package and electrical specs	Accepts wider output tolerance in cost-sensitive consumer adapters where ±0.5% is sufficient	Select when BOM cost reduction is prioritized over tight regulation in non-safety-critical systems
TL431BIDBZR	Texas Instruments part; 0.5% accuracy, higher 2.5 Ω dynamic impedance, 700 µA min cathode current	Requires larger resistor divider values and cannot support ultra-low-power modes below 500 µA	Choose only if legacy TI design reuse is required; avoid for new designs needing <100 µA operation

Compared with TLVH431AIL3T and TL431BIDBZR, TLVH431BIL3T offers superior precision and lower minimum operating current-enabling tighter voltage control in battery-powered equipment and extended thermal stability in automotive under-hood environments.

Availability

TLVH431BIL3T is available at Aetrix Electronics and suitable for isolated power supplies, battery management systems, and precision data acquisition requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TLVH431BIL3T 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The TLVH431 belongs to ST's precision analog reference product line, engineered specifically for high-accuracy, low-power shunt regulation in space-constrained and thermally demanding power conversion applications.

FAQ

What is the minimum cathode current required for regulation at –40 °C?

At –40 °C, TLVH431BIL3T requires a minimum cathode current of 160 µA to maintain regulation, per Table 5 in the datasheet. This increases from the 25 °C value of 100 µA due to semiconductor physics effects at low temperature, and must be accounted for in feedback resistor sizing.

Can TLVH431BIL3T operate with no external capacitor on the cathode?

Yes - TLVH431BIL3T is internally compensated and stable without an external cathode capacitor. However, adding a 1 nF to 10 nF ceramic capacitor improves transient response and reduces noise coupling in noisy switch-mode environments, as shown in Figure 13 of the datasheet.

How does the reference input current vary with temperature?

The reference input current (I_REF) ranges from 1.5 µA to 2.5 µA at 25 °C and increases to a maximum of 3.5 µA over –40 °C to +125 °C. This variation directly affects resistor divider power loss and voltage division ratio accuracy in high-impedance configurations.

What is the maximum cathode-to-anode voltage rating?

The absolute maximum cathode-to-anode voltage (V_KA) is 22 V, as specified in Table 2. Continuous operation above 18 V is not recommended - the device is rated for regulation up to 18 V, and exceeding 22 V risks permanent damage even for short durations.

TLVH431BIL3T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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):: 18 V

Current - Output:: 60 mA

Tolerance:: ±0.25%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 30mVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 200 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

TLVH431BIL3T FAQ

1.How can I place an order for TLVH431BIL3T through Aetrix?

Please submit a Request for Quotation (RFQ) for TLVH431BIL3T 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 TLVH431BIL3T reliable?

The price and inventory of TLVH431BIL3T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BIL3T is usually 5 days.

3.What payment methods are accepted for TLVH431BIL3T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BIL3T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLVH431BIL3T?

TLVH431BIL3T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLVH431BIL3T 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 TLVH431BIL3T?

For technical support, including TLVH431BIL3T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BIL3T requirements.

6.How does Aetrix verify that TLVH431BIL3T is sourced from the original manufacturer or authorized distributors?

All TLVH431BIL3T 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 TLVH431BIL3T meets industry standards.

7.What is the process for return or replacement of TLVH431BIL3T?

All TLVH431BIL3T units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BIL3T, 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 TLVH431BIL3T part is unused and in its original packaging.

Return procedure for TLVH431BIL3T:

1.Submit a request within 90 days.

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

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