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

STMicroelectronics TLVH431AIL5T

Name: TLVH431AIL5T
Brand: STMicroelectronics
SKU: TLVH431AIL5T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLVH431AIL5T

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-74A, SOT-753

Datasheet:: TLVH431AIL5T.pdf

Description:: IC VREF SHUNT ADJ 0.5% SOT23-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TLVH431AIL5T from STMicroelectronics is a precision adjustable shunt voltage reference in SOT23-5L package, delivering 1.24 V to 18 V output via external resistor divider, ±0.5% initial accuracy at 25 °C, 100 µA minimum operating current, and 100 ppm/°C max temperature coefficient - used for feedback regulation in isolated DC-DC converters and battery charger voltage loops.

For engineers reviewing the TLVH431AIL5T datasheet, TLVH431AIL5T pinout, TLVH431AIL5T application, or TLVH431AIL5T equivalent, this page delivers verified electrical specs, thermal performance data, SOT23-5L terminal mapping, and validated alternatives for precision analog feedback design.

Technical Context

The TLVH431AIL5T operates as a 3-terminal adjustable shunt regulator with cathode (K), anode (A), and reference (REF) terminals; it maintains stable output voltage by sinking variable current through the cathode when VKA exceeds VREF × (1 + R1/R2). Its internal bandgap reference and error amplifier enable regulation across -40 °C to +125 °C.

It supports wide cathode current range (100 µA–60 mA) with dynamic impedance as low as 0.22 Ω and turn-on time under 70 µs, making it suitable for fast transient response in switch-mode power supply feedback paths where space-constrained SOT23-5L mounting is required.

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 scaling for diverse supply rails.
Initial Voltage Accuracy	±0.5% at 25 °C - ensures tight output tolerance without calibration in production systems.
Tempco (Max)	100 ppm/°C - limits voltage drift to ±26.7 mV over -40 °C to +125 °C for TLVH431A grade.
Min Operating Current	100 µA - allows ultra-low-power operation in battery-backed or energy-harvesting circuits.
Sink Current Capability	60 mA - supports direct drive of optocoupler LEDs or small-signal transistors in isolated feedback.
Dynamic Impedance	0.22 Ω typical - minimizes AC ripple injection into feedback node for improved PSRR and stability.
Turn-On Time	70 µs max - enables rapid response to load transients in digitally controlled SMPS applications.

Pinout & Package

TLVH431AIL5T is housed in a RoHS-compliant SOT23-5L surface-mount package (3.0 mm × 1.75 mm × 1.3 mm), optimized for high-density PCB layouts and reflow compatibility. Pin assignment follows standard top-view orientation per Figure 15 in ST DocID023303 Rev 8.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (K)	Current sink output	Connects to primary-side feedback node (e.g., optocoupler anode); sinks up to 60 mA to regulate VKA.
Anode (A)	Reference return path	Connected to system ground or secondary-side common; completes shunt current loop with cathode.
Reference (REF)	High-impedance sense input	Monitors divided output voltage; draws only 1.5–2.5 µA, minimizing divider loading error.
No-connect (NC1)	Unused terminal	Internally unconnected; must be left floating or tied to A for mechanical stability (not electrically required).
No-connect (NC2)	Unused terminal	Internally unconnected; no electrical function; layout may tie to thermal pad or ground plane for thermal relief.

Key Features

Feature	Design Value
Adjustable reference voltage	1.24–18 V range via two-resistor divider - eliminates need for multiple fixed-voltage references in multi-rail designs.
Low quiescent current	100 µA min operating current - extends battery life in portable chargers and reduces standby loss in always-on systems.
High temperature stability	Guaranteed ±0.5% accuracy over -40 °C to +125 °C - enables reliable operation in automotive under-hood and industrial motor control environments.
Low dynamic impedance	0.22 Ω typical - improves loop gain margin and reduces sensitivity to PCB trace inductance in high-frequency SMPS feedback paths.
Fast turn-on response	70 µs max setting time - supports burst-mode and adaptive frequency control in light-load efficiency optimization schemes.

Applications

Isolated Flyback Converter Feedback

Battery Charger Voltage Regulation

Use Scenario: Primary-side feedback loop in 5–24 V isolated flyback converters using optocoupler-coupled error signal.

IC Role / Device Role / Timing Role: Shunt reference providing precise voltage threshold to drive optocoupler LED; sets regulated output voltage via resistor divider on secondary side.

Use Value: Enables ±1% output regulation across line/load/temperature without secondary-side controller, reducing BOM cost and board area.

Use Scenario: Constant-voltage stage in Li-ion/LiPo battery charging circuits with microcontroller supervision.

IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference or comparator threshold; defines charge termination voltage (e.g., 4.2 V ±0.021 V).

Use Value: Delivers 0.5% accuracy at 100 µA bias, enabling accurate full-charge detection while minimizing self-heating error in compact handheld form factors.

Programmable Power Supply Setpoint

Data Acquisition Reference Scaling

Use Scenario: User-adjustable output voltage in benchtop or lab-grade DC power supplies with digital potentiometer interface.

IC Role / Device Role / Timing Role: Adjustable shunt reference generating programmable feedback reference for error amplifier; replaces fixed Zener diodes.

Use Value: Supports 1.24–18 V range with <100 ppm/°C drift, enabling stable setpoint accuracy over ambient temperature swings during extended test sessions.

Use Scenario: Gain-setting reference in 12–16-bit SAR ADC front-end for industrial sensor signal conditioning.

IC Role / Device Role / Timing Role: Low-noise (30 µV_RMS) voltage reference for scaling transducer outputs before digitization.

Use Value: Provides 0.22 Ω dynamic impedance and 100 µA operating current, minimizing reference interaction with multiplexer settling and improving channel-to-channel crosstalk.

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% accuracy, but higher 2.5 mA min cathode current and 500 ppm/°C tempco vs. TLVH431AIL5T's 100 µA/100 ppm/°C.	Less suitable for ultra-low-power or wide-temp industrial use; requires larger divider current and exhibits greater drift.	Select TL431BIDBZR only if legacy footprint compatibility or higher sink current (>60 mA) is needed; otherwise TLVH431AIL5T offers superior efficiency and stability.
MAX8503ESA+	±0.2% accuracy and 50 ppm/°C tempco, but fixed 2.5 V output and SOT23-8 package - not adjustable or pin-compatible.	Cannot replace TLVH431AIL5T in resistor-programmed topologies; limited to fixed-reference roles requiring tighter tolerance.	Choose MAX8503ESA+ only when fixed 2.5 V reference with best-in-class precision is required; TLVH431AIL5T remains optimal for adjustable, low-I_Q designs.

Compared with TL431BIDBZR and MAX8503ESA+, TLVH431AIL5T uniquely balances adjustability, ultra-low operating current, and wide-temperature precision - making it the preferred choice for space- and power-constrained feedback regulation where external resistor programming is essential.

Availability

TLVH431AIL5T is available at Aetrix Electronics and suitable for isolated power supplies, battery management systems, and programmable voltage sources requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TLVH431AIL5T 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, MCU, power, and sensing 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 power management and feedback control applications.

FAQ

What is the maximum cathode-to-anode voltage rating for TLVH431AIL5T?

The absolute maximum cathode-to-anode voltage (V_KA) is 22 V, per Table 2 in ST DocID023303 Rev 8. Operation above this risks permanent damage. For reliable regulation, V_KA must remain between V_REF and 18 V under normal conditions, as specified in Table 4's operating conditions.

Can TLVH431AIL5T replace TL431 in existing SOT23-3 designs?

No - TLVH431AIL5T uses SOT23-5L with two NC pins, while TL431 typically uses SOT23-3L. Direct replacement requires PCB redesign to accommodate the extra pins and updated footprint. Electrical behavior differs too: TLVH431AIL5T draws only 100 µA vs. TL431's 1 mA min, affecting divider resistor values and stability compensation.

Does TLVH431AIL5T require an output capacitor for stability?

No external capacitor is required for basic regulation, but a 1 nF–10 nF ceramic capacitor from cathode to anode improves high-frequency noise rejection and transient response. Figure 13 in the datasheet shows turn-on behavior with 10 nF load; omitting it increases susceptibility to ringing in fast-switching SMPS feedback paths.

How does the REF pin current affect resistor divider design?

The REF pin draws 1.5–2.5 µA (typical 2 µA), which loads the upper resistor in the divider. To limit error to <0.1%, total divider current should exceed 2 mA - e.g., use R1 = 10 kΩ and R2 = 100 kΩ for ~20 µA current, then scale down both resistors by factor of 100 to achieve 2 mA while preserving ratio and output voltage.

TLVH431AIL5T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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:: 60 mA

Tolerance:: ±0.5%

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-23-5

TLVH431AIL5T FAQ

1.How can I place an order for TLVH431AIL5T through Aetrix?

Please submit a Request for Quotation (RFQ) for TLVH431AIL5T 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 TLVH431AIL5T reliable?

The price and inventory of TLVH431AIL5T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AIL5T is usually 5 days.

3.What payment methods are accepted for TLVH431AIL5T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AIL5T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLVH431AIL5T?

TLVH431AIL5T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLVH431AIL5T 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 TLVH431AIL5T?

For technical support, including TLVH431AIL5T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AIL5T requirements.

6.How does Aetrix verify that TLVH431AIL5T is sourced from the original manufacturer or authorized distributors?

All TLVH431AIL5T 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 TLVH431AIL5T meets industry standards.

7.What is the process for return or replacement of TLVH431AIL5T?

All TLVH431AIL5T units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AIL5T, 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 TLVH431AIL5T part is unused and in its original packaging.

Return procedure for TLVH431AIL5T:

1.Submit a request within 90 days.

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

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