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

STMicroelectronics TLVH431BICT

Name: TLVH431BICT
Brand: STMicroelectronics
SKU: TLVH431BICT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLVH431BICT

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: TLVH431BICT.pdf

Description:: IC VREF SHNT ADJ 0.25% SOT323-6L

Quantity:: RFQ Add To RFQ list

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Inventory:5,451

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Product details

Overview

TLVH431BICT from STMicroelectronics is a 0.25% precision adjustable shunt voltage reference in SOT323-6L package, operating from 1.24 V to 18 V with 100 µA minimum cathode current, 100 ppm/°C max tempco, and -40°C to +125°C range-used for feedback regulation in isolated DC-DC converters.

For engineers reviewing the TLVH431BICT datasheet, TLVH431BICT pinout, TLVH431BICT application, or TLVH431BICT equivalent, key selection criteria include output voltage adjustability, low quiescent current, thermal stability across automotive temperature range, and SOT323-6L footprint compatibility in space-constrained power supervision circuits.

Technical Context

The TLVH431BICT functions as a 2-terminal programmable shunt regulator where the reference input (REF) senses voltage via external resistor divider, and cathode-anode conduction adjusts to maintain V_REF = 1.24 V ±0.25% at 25°C. Its internal bandgap core ensures stable operation over -40°C to +125°C.

It delivers 60 mA sink capability with dynamic impedance of 0.22 Ω (typ), supports wide regulation current range (100 µA–60 mA), and exhibits low wideband noise (30 µV_RMS, 10 Hz–100 kHz), making it suitable for precision feedback loops in flyback and forward converters.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	1.24 V to 18 V - set externally via resistor divider; enables flexible feedback design across multiple output rails.
Voltage Precision	±0.25% at 25°C - guarantees tight initial accuracy for high-efficiency SMPS requiring minimal post-regulation trimming.
Tempco (Max)	100 ppm/°C - ensures ≤±23.5 mV total V_REF drift over full -40°C to +125°C range, critical for automotive battery chargers.
Min Operating Current	100 µA - allows stable regulation in ultra-low-power systems like energy-harvesting sensors or standby power supplies.
Sink Current Capacity	60 mA - supports direct drive of optocoupler LEDs in isolated feedback paths without external amplification.
Dynamic Impedance	0.22 Ω (typ) - minimizes output voltage perturbation under load transients, improving loop stability in closed-loop converters.
Wideband Noise	30 µV_RMS (10 Hz–100 kHz) - reduces jitter in voltage-controlled oscillator (VCO) biasing and ADC reference applications.

Pinout & Package

TLVH431BICT uses the SOT323-6L surface-mount package (1.8 mm × 1.35 mm × 0.8 mm), optimized for high-density PCB layouts in compact power modules and portable electronics.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Cathode)	Current sink node	Connects to primary-side switch node or optocoupler anode; carries full regulation current up to 60 mA.
Pin 2 (Anode)	Reference return path	Ground reference for internal bandgap; must be low-impedance connection to avoid regulation error.
Pin 3 (REF)	Feedback input	Senses divided output voltage; high-impedance (2.5 µA typ I_REF) enables high-resistor-divider designs.
Pins 4–6	Thermal pad / NC	Internally connected to anode for enhanced thermal dissipation; soldered to PCB copper for R_thJA = 221 °C/W.

Key Features

Feature	Design Value
Adjustable reference voltage	Set precisely between 1.24 V and 18 V using two external resistors-eliminates need for multiple fixed-voltage references.
Low operating current	100 µA minimum cathode current enables regulation in always-on circuits with <100 µW quiescent loss.
High temperature stability	Guaranteed ±0.25% accuracy over -40°C to +125°C supports under-hood automotive and industrial power supply designs.
Low dynamic impedance	0.22 Ω typical ensures minimal output voltage deviation during fast load steps, simplifying compensation in isolated feedback loops.
SOT323-6L thermal performance	Integrated thermal pad lowers junction-to-ambient resistance to 221 °C/W-enables 60 mA operation without heatsink in 4-layer boards.

Applications

Isolated Flyback Converter Feedback

Battery Charger Voltage Regulation

Use Scenario: Primary-side feedback in 5–24 V isolated AC/DC adapters using optocoupler-coupled TLVH431BICT on secondary side.

IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V reference to optocoupler LED, enabling accurate output voltage sensing and regulation.

Use Value: ±0.25% initial accuracy and 100 ppm/°C tempco ensure ±1.5% total output tolerance over temperature-meeting USB PD and medical power standards.

Use Scenario: Constant-voltage stage in Li-ion battery charger ICs where TLVH431BICT sets termination threshold at 4.2 V ±0.01 V.

IC Role / Device Role / Timing Role: Adjustable shunt reference generating precise feedback voltage for charger controller error amplifier.

Use Value: 100 µA min operating current allows regulation even during trickle-charge phase, preventing premature CV mode exit.

Industrial Data Acquisition Reference

Energy Meter Voltage Scaling

Use Scenario: Precision scaling of 0–10 V sensor outputs into 0–3.3 V ADC input range in PLC analog input modules.

IC Role / Device Role / Timing Role: Programmable shunt reference establishing stable 2.5 V reference for op-amp gain-setting network.

Use Value: 30 µV_RMS wideband noise avoids introducing quantization error in 16-bit SAR ADC systems.

Use Scenario: High-accuracy voltage divider biasing in Class 0.5 smart electricity meters measuring 230 VAC mains.

IC Role / Device Role / Timing Role: Shunt reference setting exact 1.24 V reference point for metrology ADC front-end scaling resistors.

Use Value: ±0.25% precision and 100 ppm/°C tempco contribute <0.1% error to overall meter voltage channel accuracy over temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431BIDBZR	0.5% initial accuracy, higher 200 ppm/°C max tempco, SOT23-3L package with no thermal pad	Lacks thermal pad and tighter tempco; unsuitable for >40 mA continuous operation or automotive ambient temps	Select when cost sensitivity outweighs thermal and accuracy requirements in consumer-grade non-isolated supplies
MAX8502ESA+	0.1% initial accuracy, 50 ppm/°C tempco, but requires 500 µA min cathode current and only supports up to 12 V output	Higher accuracy but incompatible with 15–18 V SMPS outputs and increases standby power by 5×	Select only for ultra-precision <12 V rails where 100 µA standby current is not constrained

Compared with TL431BIDBZR and MAX8502ESA+, TLVH431BICT uniquely balances 0.25% accuracy, 100 µA min current, 18 V headroom, and SOT323-6L thermal performance-making it optimal for automotive-grade isolated power supplies requiring long-term stability and space efficiency.

Availability

TLVH431BICT is available at Aetrix Electronics and suitable for isolated flyback converters, battery charger feedback circuits, and industrial data acquisition systems requiring stable component supply with guaranteed long-term availability.

Supply support for TLVH431BICT 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 microcontrollers, power management ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The TLVH431 belongs to ST's precision voltage reference product line, engineered specifically for high-stability feedback regulation in isolated DC-DC converters and battery management systems where accuracy, low power, and thermal robustness are critical.

FAQ

What is the maximum cathode-to-anode voltage rating for TLVH431BICT?

The absolute maximum cathode-to-anode voltage (V_KA) is 22 V. Operation above this risks permanent damage. For reliable regulation, V_KA must remain within V_REF to 18 V per datasheet operating conditions-ensuring safe margin below absolute max while supporting common 15 V and 18 V output rails.

Can TLVH431BICT replace TL431 in existing designs?

Yes, with layout adaptation: TLVH431BICT is functionally compatible but uses SOT323-6L (6-pin) versus TL431's SOT23-3L (3-pin). Pin 1 (cathode), Pin 2 (anode), and Pin 3 (REF) map directly, but Pins 4–6 require thermal pad connection. No circuit redesign is needed beyond footprint and thermal relief updates.

Does TLVH431BICT support operation below 100 µA?

No-100 µA is the guaranteed minimum cathode current for regulation. Below this, V_REF deviates significantly (e.g., +200 µA variation at -40°C). Designs requiring sub-100 µA operation must use alternative references like TLVH431A with tighter I_Kmin spec or add bias current.

How does the SOT323-6L thermal pad affect PCB layout?

The thermal pad (Pins 4–6) must be soldered to a dedicated PCB copper pour connected to the anode net. This reduces R_thJA from 300+ °C/W (no pad) to 221 °C/W, enabling 60 mA operation at +85°C ambient. A minimum 3 mm² exposed copper area with 4+ thermal vias to inner ground planes is recommended.

TLVH431BICT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 6-TSSOP, SC-88, SOT-363

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-323-6L

TLVH431BICT FAQ

1.How can I place an order for TLVH431BICT through Aetrix?

Please submit a Request for Quotation (RFQ) for TLVH431BICT 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 TLVH431BICT reliable?

The price and inventory of TLVH431BICT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BICT is usually 5 days.

3.What payment methods are accepted for TLVH431BICT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BICT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLVH431BICT?

TLVH431BICT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLVH431BICT 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 TLVH431BICT?

For technical support, including TLVH431BICT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BICT requirements.

6.How does Aetrix verify that TLVH431BICT is sourced from the original manufacturer or authorized distributors?

All TLVH431BICT 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 TLVH431BICT meets industry standards.

7.What is the process for return or replacement of TLVH431BICT?

All TLVH431BICT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BICT, 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 TLVH431BICT part is unused and in its original packaging.

Return procedure for TLVH431BICT:

1.Submit a request within 90 days.

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

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