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

STMicroelectronics TS431AIYLT

Name: TS431AIYLT
Brand: STMicroelectronics
SKU: TS431AIYLT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS431AIYLT

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-74A, SOT-753

Datasheet:: TS431AIYLT.pdf

Description:: IC VREF SHUNT ADJ 1% SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,889

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Product details

Overview

TS431AIYLT from STMicroelectronics is an AEC-Q100 qualified, adjustable shunt voltage reference IC in SOT23-5 package, delivering 1.24 V to 6 V output with 1% initial precision, 0.2 Ω output impedance, and operation down to 60 µA cathode current. It serves as a precision feedback element in automotive-grade 3.3 V switching power supplies, especially when driving optocouplers in isolated flyback regulators.

For engineers reviewing the TS431AIYLT datasheet, TS431AIYLT pinout, TS431AIYLT application, or TS431AIYLT equivalent, this page delivers verified electrical parameters, automotive qualification status, thermal resistance data (R_thJA = 250 °C/W), stable capacitive load behavior, and direct comparison with TL431-class alternatives for design-in validation.

Technical Context

The TS431AIYLT implements a bandgap-based three-terminal shunt reference with internal error amplifier and NPN pass transistor. Its reference input (REF) senses voltage across external resistive dividers, enabling programmable output while maintaining regulation at cathode currents from 60 µA to 30 mA.

It features low temperature coefficient (100 ppm/°C), guaranteed stability with any capacitive load, and ESD robustness (2 kV HBM). The device operates across −40 °C to +125 °C and meets AEC-Q100 Grade 1 requirements for automotive under-hood applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	1.24 V to 6 V - Programmable via two external resistors; enables flexible feedback design without discrete Zener selection.
Initial Voltage Precision	±1% at 25 °C - Ensures tight output tolerance in closed-loop regulation without post-manufacturing trimming.
Cathode Current Range	60 µA to 30 mA - Supports ultra-low-power standby modes and high-current transient response in SMPS feedback paths.
Output Impedance	0.2 Ω typical - Minimizes load-induced voltage droop and improves loop stability in optocoupler-driven feedback networks.
Tempco	100 ppm/°C - Predictable drift over −40 °C to +125 °C; enables accurate voltage setpoint maintenance in engine control units.
ESD Rating	2 kV HBM - Meets automotive assembly handling requirements without additional protection circuitry.
Package	SOT23-5 - Surface-mount, thermally enhanced plastic micropackage with R_thJA = 250 °C/W for compact PCB layouts.

Pinout & Package

SOT23-5 plastic micropackage with exposed pad not electrically connected; 5-pin configuration optimized for low-inductance feedback routing and thermal dissipation in space-constrained automotive modules.

Pin/Terminal	Circuit Role	Design Meaning
K (Cathode)	Current sink output terminal	Connects to primary-side SMPS controller feedback node; sinks regulated current to maintain V_KA = V_REF × (1 + R1/R2).
A (Anode)	Reference ground return	Common return path for cathode current and reference divider; must be low-impedance to avoid regulation error.
REF	Internal reference input	Senses voltage across external R1–R2 divider; high-impedance (70 nA typ.) minimizes loading on feedback network.
NC	No connect	Internally unconnected pin; left floating per datasheet - no PCB trace or solder required.
NC	No connect	Second internally unconnected pin; electrically isolated - omitted from schematic symbol and layout routing.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 certified (−40 °C to +125 °C), including stress testing and failure analysis per automotive reliability standards.
Low-voltage start-up	Operates down to 1.24 V cathode-anode voltage - enables use in low-input-voltage DC-DC converters where TL431 fails to regulate.
Capacitive load immunity	Stable with any value of output capacitance - eliminates need for series damping resistors in optocoupler LED drive circuits.
Low quiescent current	60 µA minimum cathode current for regulation - extends battery life in always-on automotive subsystems (e.g., CAN wake-up receivers).
High PSRR	2.7 mV/V typical ΔV_REF/ΔV_KA - rejects ripple on cathode supply rail, improving feedback accuracy in noisy power domains.

Applications

Automotive Power Supply Regulation

Industrial Isolated Feedback Loop

Use Scenario: Regulating 3.3 V output in AEC-Q100-compliant flyback converter for ADAS camera module power rail.

IC Role / Device Role / Timing Role: Shunt reference providing precise voltage feedback to optocoupler LED, closing secondary-side regulation loop.

Use Value: 1% initial precision and 100 ppm/°C tempco ensure ±2% output tolerance across full automotive temperature range without calibration.

Use Scenario: Secondary-side voltage sensing in industrial PLC power supply with reinforced isolation barrier.

IC Role / Device Role / Timing Role: Adjustable shunt reference setting feedback threshold for optocoupler-coupled PWM controller.

Use Value: 60 µA minimum cathode current allows reliable regulation even during light-load conditions common in factory automation standby states.

Low-Power Battery Management

Medical Sensor Reference

Use Scenario: Precision voltage reference for battery cell monitoring in automotive 12 V system with sleep-mode current budget <100 µA.

IC Role / Device Role / Timing Role: Low-quiescent shunt reference enabling accurate ADC reference scaling during extended vehicle-off periods.

Use Value: 60 µA regulation threshold and 2 kV HBM ESD rating support direct integration into battery-sensed analog front-end without external current sources.

Use Scenario: Stable excitation source for bridge-based pressure transducers in portable diagnostic equipment.

IC Role / Device Role / Timing Role: Programmable 2.5 V reference derived from 1.24 V base, powering Wheatstone bridge with minimal thermal drift.

Use Value: 0.2 Ω output impedance prevents loading-induced gain error; 100 ppm/°C tempco ensures <0.1% full-scale error over clinical operating range (10–40 °C).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDR	2.5 V fixed reference; ±1% precision; requires ≥1 mA cathode current for regulation; no AEC-Q100 qualification.	Not suitable for automotive under-hood use; higher minimum current limits efficiency in battery-powered systems.	Select only for cost-sensitive non-automotive designs where fixed 2.5 V output suffices and thermal grade is not required.
MAX6008AEUR+T	Fixed 1.25 V output; ±0.2% precision; 30 ppm/°C tempco; SOT23-3; max 20 mA cathode current.	Lacks adjustability and automotive qualification; limited to low-current, high-precision fixed-reference roles.	Choose only when ultra-low tempco and fixed voltage are mandatory, and AEC-Q100 compliance is unnecessary.

Compared with TL431ACDR and MAX6008AEUR+T, TS431AIYLT uniquely combines automotive qualification, 1.24–6 V adjustability, 60 µA regulation threshold, and SOT23-5 packaging-making it the only drop-in solution for AEC-Q100-compliant, programmable shunt references in space-constrained power systems.

Availability

TS431AIYLT is available at Aetrix Electronics and suitable for automotive power supply regulation, industrial isolated feedback loops, low-power battery management, and medical sensor reference applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TS431AIYLT 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 components, and automotive-grade silicon.

TS431AIYLT belongs to ST's precision analog reference product line, engineered specifically for AEC-Q100-compliant feedback regulation in automotive power conversion and industrial isolation systems.

FAQ

What is the minimum cathode current required for regulation in TS431AIYLT?

The TS431AIYLT maintains regulation at a minimum cathode current of 60 µA, verified across −40 °C to +125 °C. This enables reliable operation in ultra-low-power automotive subsystems such as always-on CAN transceivers and battery monitoring circuits where current budgets are tightly constrained.

Does TS431AIYLT require external compensation for stability?

No external compensation is required. The TS431AIYLT is designed to remain stable with any capacitive load, including large optocoupler LED capacitances and bulk output capacitors. This eliminates the need for series damping resistors or RC networks in feedback paths, simplifying layout and reducing BOM count.

How does TS431AIYLT differ from standard TS431 variants?

TS431AIYLT is the automotive-grade version: it carries AEC-Q100 Grade 1 qualification, undergoes enhanced screening per AEC-Q001/Q002, and is packaged in SOT23-5 with marking code L276. Standard TS431AILT shares electrical specs but lacks automotive qualification and associated reliability testing.

Can TS431AIYLT replace TL431 in existing designs?

Yes, with minor resistor recalculations: TS431AIYLT matches TL431 pinout in SOT23-5 (K-A-REF-NC-NC), supports identical feedback topology, and offers lower minimum current (60 µA vs. 1 mA) and better thermal performance. However, TL431 lacks AEC-Q100 certification and cannot be used in automotive safety-critical applications without requalification.

TS431AIYLT 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):: 6 V

Current - Output:: 30 mA

Tolerance:: ±1%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 60 µA

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

TS431AIYLT FAQ

1.How can I place an order for TS431AIYLT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS431AIYLT 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 TS431AIYLT reliable?

The price and inventory of TS431AIYLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS431AIYLT is usually 5 days.

3.What payment methods are accepted for TS431AIYLT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS431AIYLT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS431AIYLT?

TS431AIYLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS431AIYLT 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 TS431AIYLT?

For technical support, including TS431AIYLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS431AIYLT requirements.

6.How does Aetrix verify that TS431AIYLT is sourced from the original manufacturer or authorized distributors?

All TS431AIYLT 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 TS431AIYLT meets industry standards.

7.What is the process for return or replacement of TS431AIYLT?

All TS431AIYLT units undergo pre-shipment inspection (PSI). If there is an issue with TS431AIYLT, 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 TS431AIYLT part is unused and in its original packaging.

Return procedure for TS431AIYLT:

1.Submit a request within 90 days.

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

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