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

STMicroelectronics TS431BIZ

Name: TS431BIZ
Brand: STMicroelectronics
SKU: TS431BIZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS431BIZ

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: TS431BIZ.pdf

Description:: IC VREF SHUNT ADJ 0.5% TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,337

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Product details

Overview

TS431BIZ from STMicroelectronics is an AEC-Q100-qualified, adjustable shunt voltage reference IC in TO-92 package, delivering 0.5% initial voltage precision (1.24 V to 6 V), 100 ppm/°C temperature coefficient, and stable operation from 60 µA to 30 mA cathode current. It serves as a precision feedback element in automotive 3.3 V switching power supplies regulating optocoupler-driven isolated flyback converters.

For engineers reviewing the TS431BIZ datasheet, TS431BIZ pinout, TS431BIZ application, or TS431BIZ equivalent, key selection criteria include its low-voltage start-up (1.24 V), ultra-low minimum cathode current (60 µA), automotive-grade qualification, and compatibility with capacitive loads without external compensation.

Technical Context

The TS431BIZ implements a three-terminal bandgap-based shunt reference architecture with internal reference voltage (V_REF = 1.24 V) and high-impedance reference input. Its output voltage is set externally via two resistors (R₁, R₂) between cathode, anode, and reference terminals, enabling programmable regulation across 1.24–6 V.

It operates over –40 °C to +125 °C with guaranteed 0.5% initial accuracy and 21 mV total output voltage drift over full temperature range. The device features 0.2 Ω static impedance, 2 kV HBM ESD rating, and inherent stability with any capacitive load - eliminating need for external phase compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	1.24 V to 6 V - Programmable via external resistor divider; enables flexible feedback design for 3.3 V, 5 V, or custom rail regulation.
Initial Voltage Precision	±0.5% at 25 °C - Tight tolerance reduces system calibration burden and improves closed-loop accuracy in automotive SMPS feedback paths.
Temperature Coefficient	100 ppm/°C - Predictable drift supports stable regulation across –40 °C to +125 °C ambient, meeting automotive thermal requirements.
Cathode Current Range	60 µA to 30 mA - Enables operation at ultra-low bias (e.g., standby mode) and robust regulation under full-load transient conditions.
Static Impedance	0.2 Ω (typ.) - Low output impedance ensures minimal load-induced voltage deviation during dynamic current steps in feedback loops.
ESD Protection	2 kV HBM - Meets automotive board-level ESD robustness requirements without additional protection circuitry.

Pinout & Package

TS431BIZ is supplied in TO-92 plastic package (3-lead, through-hole), with lead finish Pb-free per ECOPACK® standards. Pin assignment follows standard TO-92 orientation: viewed from bottom (flat side up), leads are Anode (left), Cathode (center), Reference (right).

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Reference ground return path	Connected to system ground or feedback node common point; sets reference potential for internal bandgap core.
Cathode (K)	Regulated output terminal	Delivers precise shunt current to maintain programmed output voltage; sinks current into optocoupler LED or error amplifier.
Reference (R)	Adjustment input	High-impedance (≤160 nA) input sensing voltage divider ratio; determines regulated cathode voltage via V_K = V_REF(1 + R₁/R₂) + I_REFR₁.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 certified (–40 °C to +125 °C), enabling use in engine control, body electronics, and ADAS power rails.
Low-voltage operation	Starts regulation at 1.24 V cathode-anode voltage - supports direct 1.8 V/2.5 V logic-compatible feedback without level-shifting.
Capacitive load stability	No external compensation required for any capacitive load - simplifies layout and eliminates risk of oscillation in isolated SMPS designs.
Ultra-low minimum cathode current	60 µA regulation threshold - enables efficient light-load and standby operation in energy-conscious automotive systems.

Applications

Automotive DC-DC Feedback

Industrial Isolated PSU

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

IC Role / Device Role / Timing Role: Shunt voltage reference providing precision feedback to optocoupler-coupled secondary-side error amplifier.

Use Value: 0.5% initial accuracy and 100 ppm/°C TC ensure ±1.5% output tolerance over temperature, meeting ASIL-B functional safety margin requirements.

Use Scenario: Stabilizing 5 V output in a DIN-rail mounted industrial AC-DC adapter with wide input range.

IC Role / Device Role / Timing Role: Adjustable shunt reference setting feedback threshold for TL431-replacement topology with improved low-current performance.

Use Value: 60 µA minimum cathode current enables stable regulation down to 10% load, reducing no-load power loss by 35% vs. legacy TL431.

Medical Sensor Power Rail

Energy Meter Reference

Use Scenario: Generating stable 2.5 V reference for 24-bit sigma-delta ADC in portable patient monitor front-end.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference establishing ADC full-scale input range.

Use Value: 21 mV max ΔV_REF over –40 °C to +125 °C limits ADC gain error to <0.1%, supporting Class I medical accuracy compliance.

Use Scenario: Providing accurate 1.24 V reference for metrology-grade energy metering IC (e.g., ADE7880) in smart grid meters.

IC Role / Device Role / Timing Role: Primary shunt reference defining voltage channel scaling factor in polyphase electricity measurement.

Use Value: 0.2 Ω output impedance prevents loading-induced error when driving high-impedance metering IC inputs, preserving 0.1% energy measurement accuracy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACZ	2% initial accuracy, 50 µA min cathode current, no AEC-Q100 qualification	Limited to commercial/industrial grade; unsuitable for automotive under-hood environments	Select when cost sensitivity outweighs automotive qualification and tighter accuracy needs.
MAX6008AEUR+T	0.2% accuracy, SOT23-3 package, 10 µA max supply current, but only 1.25 V fixed output	Fixed-output only; lacks adjustability and higher current capability of TS431BIZ	Choose only for space-constrained, fixed-voltage applications where 1.25 V suffices and 30 mA sink capability is unnecessary.

Compared with TL431ACZ and MAX6008AEUR+T, TS431BIZ uniquely combines automotive qualification, 0.5% adjustability, 30 mA sink capability, and TO-92 through-hole reliability - making it the only drop-in solution for AEC-Q100-compliant, programmable 3.3 V/5 V SMPS feedback in production automotive modules.

Availability

TS431BIZ is available at Aetrix Electronics and suitable for automotive power management, industrial isolated power supplies, medical sensor signal chains, and smart energy metering requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TS431BIZ 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The TS431 belongs to ST's precision analog voltage reference product line, engineered specifically for automotive-grade feedback regulation in isolated DC-DC converters where reliability, accuracy, and low-power operation are critical.

FAQ

What is the maximum cathode-to-anode voltage rating for TS431BIZ?

The absolute maximum cathode-to-anode voltage (V_KA) is 10 V, as specified in Table 1 of the datasheet. Operation above this value risks permanent damage. For reliable 6 V programmable output applications, a 10 V rating provides 4 V headroom - sufficient for typical flyback snubber transients and input ripple margins in automotive 12 V systems.

Can TS431BIZ replace TL431 in existing designs?

Yes, TS431BIZ is pin-compatible with TL431 in TO-92 packages and offers superior specs: lower minimum cathode current (60 µA vs. 1 mA), tighter accuracy (0.5% vs. 2%), and AEC-Q100 qualification. No circuit changes are needed, but verify that the 0.2 Ω output impedance and improved stability allow removal of optional compensation capacitors used with TL431.

Does TS431BIZ require external capacitors for stability?

No - the TS431BIZ is internally compensated and remains stable with any capacitive load, including large bulk electrolytics or ceramic output caps commonly used in SMPS outputs. This eliminates the need for series resistance or feedforward capacitors required by many legacy references, simplifying layout and improving transient response.

What is the marking code for TS431BIZ in TO-92 packaging?

The TS431BIZ is marked "TS431BI" on the TO-92 package body, as confirmed in Table 8 of the datasheet. This distinguishes it from the SOT23-5 variants (e.g., TS431BILT marked "L270") and ensures correct identification during manual assembly or visual inspection in automotive production lines.

TS431BIZ Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

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:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

TS431BIZ FAQ

1.How can I place an order for TS431BIZ through Aetrix?

Please submit a Request for Quotation (RFQ) for TS431BIZ 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 TS431BIZ reliable?

The price and inventory of TS431BIZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS431BIZ is usually 5 days.

3.What payment methods are accepted for TS431BIZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS431BIZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS431BIZ?

TS431BIZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS431BIZ 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 TS431BIZ?

For technical support, including TS431BIZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS431BIZ requirements.

6.How does Aetrix verify that TS431BIZ is sourced from the original manufacturer or authorized distributors?

All TS431BIZ 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 TS431BIZ meets industry standards.

7.What is the process for return or replacement of TS431BIZ?

All TS431BIZ units undergo pre-shipment inspection (PSI). If there is an issue with TS431BIZ, 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 TS431BIZ part is unused and in its original packaging.

Return procedure for TS431BIZ:

1.Submit a request within 90 days.

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

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