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

STMicroelectronics TS431BIYLT

Name: TS431BIYLT
Brand: STMicroelectronics
SKU: TS431BIYLT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS431BIYLT

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: SC-74A, SOT-753

Datasheet:: TS431BIYLT.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TS431BIYLT from STMicroelectronics is an AEC-Q100 qualified, adjustable shunt voltage reference IC in SOT23-5 package, delivering 0.5% initial voltage precision (1.24 V to 6 V), 100 ppm/°C temperature coefficient, and stable 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 TS431BIYLT datasheet, TS431BIYLT pinout, TS431BIYLT application, or TS431BIYLT equivalent, key selection criteria include cathode current range (60 µA–30 mA), low output impedance (0.2 Ω), capacitive load stability, AEC-Q100 qualification, and SOT23-5 thermal resistance (R_thJA = 250 °C/W).

Technical Context

The TS431BIYLT implements a bandgap-based three-terminal shunt reference architecture with internal error amplifier and reference voltage node (V_REF = 1.24 V). Its regulation relies on external resistor divider feedback between cathode and reference terminals, enabling programmable output voltage up to 6 V while maintaining 0.5% accuracy over –40 °C to +125 °C.

It operates with ultra-low minimum cathode current (60 µA), outperforming TL431 in low-power startup and standby conditions. Dynamic response is optimized above 500 µA cathode current, and its 0.2 Ω static impedance ensures minimal load-induced voltage deviation across 0.1–15 mA operating range.

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 for 3.3 V, 5 V, or custom rail regulation.
Voltage Precision	±0.5% at 25 °C - Guarantees tight output tolerance without trimming; reduces system calibration burden in automotive applications.
Cathode Current Range	60 µA to 30 mA - Supports low-power standby modes and full-load regulation in isolated SMPS feedback loops.
Temperature Coefficient	100 ppm/°C - Ensures ≤12.5 mV drift over –40 °C to +125 °C (ΔT = 165 °C), critical for automotive thermal robustness.
Output Impedance	0.2 Ω typical - Minimizes voltage shift under dynamic load transients; maintains regulation during optocoupler LED current variations.
ESD Protection	HBM: 2 kV, MM: 200 V - Meets automotive board-level ESD requirements per ISO 10605 without external protection.
Operating Temperature	–40 °C to +125 °C - Fully specified for under-hood automotive environments; validated per AEC-Q100 Grade 1.

Pinout & Package

SOT23-5 plastic micropackage (ECOPACK® compliant), 5-pin surface-mount device with exposed pad not connected internally. Package dimensions: 2.80–3.00 mm × 1.50–1.75 mm × 0.90–1.45 mm height; R_thJA = 250 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (K)	Output terminal; sinks current to ground via external load	Primary regulation node; connects to SMPS transformer secondary or optocoupler anode; handles up to 30 mA continuous current.
Anode (A)	Reference return path; tied to system ground	Provides common reference point for feedback loop; must be low-impedance ground connection to avoid regulation error.
Reference (R)	High-impedance input sensing V_REF node	Connects to resistor divider midpoint; draws only 70–160 nA, minimizing divider current loss and power consumption.
No Connect (NC)	Unbonded internal pin	Must remain unconnected; no electrical function; improves manufacturability and test yield in SOT23-5 layout.
No Connect (NC)	Unbonded internal pin	Second NC pin; electrically isolated; allows 5-pin package standardization across TS431 variants without redesign.

Key Features

Feature	Design Value
AEC-Q100 qualified (Grade 1)	Validated for automotive use including temperature cycling, HTOL, and ESD; eliminates need for additional qualification testing.
Stable with any capacitive load	Eliminates need for series damping resistors or compensation networks; simplifies PCB layout in noisy automotive environments.
Low 60 µA minimum cathode current	Enables reliable startup and regulation in ultra-low-power auxiliary supplies, reducing standby losses in ADAS modules.
0.2 Ω output impedance	Ensures <1 mV output shift under 5 mA load step; critical for maintaining tight voltage tolerance in closed-loop feedback.
100 ppm/°C tempco	Guarantees <±21 mV total drift over full automotive temperature range; meets ASIL-B functional safety margin requirements.

Applications

Automotive DC-DC Converter Feedback

Industrial Isolated Power Supply

Use Scenario: Regulating 3.3 V output in a flyback converter powering automotive infotainment MCU.

IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise feedback voltage to optocoupler-driven PWM controller.

Use Value: 0.5% precision and AEC-Q100 qualification ensure consistent output regulation across vehicle lifetime and temperature extremes.

Use Scenario: Secondary-side voltage reference in a 24 V to 5 V isolated industrial power module.

IC Role / Device Role / Timing Role: Cathode-sinking reference establishing stable 5 V setpoint for optocoupler-coupled feedback loop.

Use Value: 60 µA minimum cathode current enables reliable regulation even during light-load burst-mode operation.

Programmable Voltage Monitor

Low-Power Sensor Bias Reference

Use Scenario: Threshold detection circuit comparing battery voltage against configurable trip point in EV battery management.

IC Role / Device Role / Timing Role: Adjustable reference input to comparator; sets accurate overvoltage/undervoltage thresholds.

Use Value: 100 ppm/°C tempco ensures trip point stability across –40 °C to +85 °C ambient, avoiding false alarms.

Use Scenario: Providing stable 2.5 V bias to MEMS pressure sensor in engine control unit.

IC Role / Device Role / Timing Role: Low-drift, low-current shunt reference supplying excitation voltage to sensor bridge.

Use Value: 70 nA typical reference input current minimizes loading error on high-impedance sensor interface.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDR	2% initial tolerance, higher 100 µA min cathode current, no AEC-Q100 qualification	Not suitable for automotive production; requires external compensation for >1 nF capacitive loads	Select only for cost-sensitive non-automotive industrial designs where 2% tolerance is acceptable.
MAX6008AEUR+T	0.2% precision, 50 µA min cathode current, but fixed 2.5 V output (non-adjustable)	Lacks programmability; cannot replace TS431BIYLT in variable-output or optocoupler-feedback topologies	Choose only when fixed 2.5 V reference suffices and ultra-low startup current is mandatory.

Compared with TL431ACDR and MAX6008AEUR+T, the TS431BIYLT uniquely combines automotive qualification, 0.5% adjustability, and robust capacitive-load stability-making it the sole fit for AEC-Q100-compliant, programmable feedback in isolated SMPS.

Availability

TS431BIYLT is available at Aetrix Electronics and suitable for automotive power conversion, industrial isolated supplies, programmable voltage monitoring, and low-power sensor biasing requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TS431BIYLT 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 ICs, analog components, and automotive-grade semiconductors.

The TS431 belongs to ST's precision analog reference product line, engineered specifically for automotive and industrial feedback systems demanding high accuracy, low power, and AEC-Q100 reliability.

FAQ

What is the maximum cathode-to-anode voltage the TS431BIYLT can withstand?

The TS431BIYLT has an absolute maximum cathode-to-anode voltage (V_KA) rating of 10 V. Operation beyond this value risks permanent damage. In normal regulation, V_KA equals the programmed output voltage (1.24 V to 6 V); the 10 V limit provides safe margin for transient overvoltage events in automotive systems.

Can the TS431BIYLT replace TL431 in existing designs without modification?

Pin-for-pin replacement is possible in SOT23-5 layouts, but design validation is required. The TS431BIYLT offers lower minimum cathode current (60 µA vs. 100 µA) and superior capacitive-load stability, potentially allowing removal of damping resistors. However, its tighter 0.5% tolerance may affect feedback loop gain margins and should be verified in final system testing.

Does the TS431BIYLT require external compensation for stability?

No external compensation is required. The TS431BIYLT is designed to remain stable with any capacitive load, including large bulk capacitors (>10 µF) commonly used in automotive power supplies. This eliminates the need for series resistors or RC networks typically required with TL431, simplifying layout and improving transient response.

How does the AEC-Q100 qualification impact the TS431BIYLT's use in non-automotive applications?

AEC-Q100 qualification confirms enhanced reliability, including extended temperature operation (–40 °C to +125 °C), rigorous stress testing, and improved parametric consistency. While not required outside automotive, these attributes directly benefit industrial, medical, and aerospace applications demanding long-term stability and field reliability-without increasing cost or complexity.

TS431BIYLT 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:: ±0.5%

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

TS431BIYLT FAQ

1.How can I place an order for TS431BIYLT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS431BIYLT 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 TS431BIYLT reliable?

The price and inventory of TS431BIYLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS431BIYLT is usually 5 days.

3.What payment methods are accepted for TS431BIYLT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS431BIYLT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS431BIYLT?

TS431BIYLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS431BIYLT 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 TS431BIYLT?

For technical support, including TS431BIYLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS431BIYLT requirements.

6.How does Aetrix verify that TS431BIYLT is sourced from the original manufacturer or authorized distributors?

All TS431BIYLT 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 TS431BIYLT meets industry standards.

7.What is the process for return or replacement of TS431BIYLT?

All TS431BIYLT units undergo pre-shipment inspection (PSI). If there is an issue with TS431BIYLT, 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 TS431BIYLT part is unused and in its original packaging.

Return procedure for TS431BIYLT:

1.Submit a request within 90 days.

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

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