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

STMicroelectronics TS431IZ-AP

Name: TS431IZ-AP
Brand: STMicroelectronics
SKU: TS431IZ-AP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS431IZ-AP

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

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

Datasheet:: TS431IZ-AP.pdf

Description:: IC VREF SHUNT ADJ 2% TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,520

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Product details

Overview

TS431IZ-AP from STMicroelectronics is an AEC-Q100 qualified, adjustable shunt voltage reference IC in TO92 package, delivering 2% initial voltage accuracy across 1.24–6 V output range with 100 ppm/°C temperature coefficient and 0.2 Ω low output impedance. It operates down to 60 µA cathode current and supports automotive-grade power regulation in isolated feedback loops.

For engineers reviewing the TS431IZ-AP datasheet, TS431IZ-AP pinout, TS431IZ-AP application, or TS431IZ-AP equivalent, this page provides verified technical context for precision voltage reference selection in 3.3 V/5 V switching power supplies, optocoupler-driven feedback paths, and automotive body control modules requiring stable low-current shunt operation.

Technical Context

The TS431IZ-AP functions as a three-terminal adjustable shunt reference where output voltage is set externally via two resistors between cathode, anode, and reference terminals. Its internal bandgap core delivers 1.24 V nominal reference voltage with guaranteed stability over −40 °C to +125 °C operating range and 60 µA minimum cathode current for regulation.

It features low dynamic impedance (0.2 Ω typ.), wide cathode current capability (60 µA–30 mA), and inherent stability with any capacitive load-enabling direct use in optocoupler-based feedback without external compensation. ESD protection meets 2 kV HBM and 200 V MM standards.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	1.24 V to 6 V - Adjustable via external resistor divider; enables flexible feedback design for 3.3 V, 5 V, and custom rail regulation.
Initial Accuracy	±2% - Guaranteed at 25 °C; defines maximum deviation before trimming or calibration in production systems.
Tempco	100 ppm/°C - Predictable drift over −40 °C to +125 °C; supports automotive under-hood thermal environments.
Cathode Current Range	60 µA to 30 mA - Enables ultra-low-power standby operation and robust regulation under full-load transient conditions.
Output Impedance	0.2 Ω typical - Ensures minimal voltage droop during fast load steps; critical for tight-loop feedback stability.
ESD Rating	2 kV HBM / 200 V MM - Meets automotive assembly handling requirements without additional protection circuitry.

Pinout & Package

TS431IZ-AP uses the TO92 plastic through-hole package (3-pin, straight lead configuration) with standard pin assignment: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Reference. This mechanical form factor supports manual soldering, wave soldering, and legacy PCB layouts in automotive and industrial power supplies.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Reference ground node	Connected to system ground or return path; establishes common reference potential for feedback network.
Cathode (Pin 2)	Regulated output node	Drives optocoupler LED or error amplifier input; sinks current proportional to output overvoltage condition.
Reference (Pin 3)	Adjustment input	Connects to resistor divider midpoint; senses output voltage and triggers cathode conduction when threshold exceeded.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 compliant (−40 °C to +125 °C), enabling use in engine control units and body electronics without derating.
Low-voltage operation	Starts regulation at 1.24 V cathode-anode voltage-supports 3.3 V supply rails where TL431 cannot initiate regulation.
Capacitive load immunity	Stable with any output capacitance-eliminates need for series resistance or compensation networks in feedback paths.
Ultra-low I_min	60 µA minimum cathode current-reduces quiescent power in always-on automotive modules and battery-backed systems.
Low output impedance	0.2 Ω static impedance-maintains <1 mV output shift under 10 mA load transients, improving closed-loop accuracy.

Applications

AC-DC Adapter Feedback

Automotive Body Control Module

Use Scenario: Regulating 5 V output in isolated flyback converters using PC817 optocoupler feedback loop.

IC Role / Device Role / Timing Role: Shunt reference providing precise voltage sensing at secondary side; controls optocoupler LED current to adjust primary-side PWM duty cycle.

Use Value: 2% accuracy and 100 ppm/°C tempco ensure ±3% output tolerance over full temperature range without trimming.

Use Scenario: Providing stable 3.3 V reference for microcontroller ADC and CAN transceiver bias in door module.

IC Role / Device Role / Timing Role: Low-current shunt reference supplying accurate voltage to analog subsystems during sleep/wake transitions.

Use Value: 60 µA I_min enables reliable regulation even during 10 µA standby current modes, reducing system leakage.

Industrial PLC Power Monitor

Medical Infusion Pump Supply

Use Scenario: Monitoring 24 V DC input rail integrity in programmable logic controller backplane power distribution.

IC Role / Device Role / Timing Role: Precision shunt element in comparator-based overvoltage/undervoltage detection circuit.

Use Value: 0.2 Ω output impedance ensures fast response (<1 µs) to rail faults, meeting SIL-2 functional safety timing constraints.

Use Scenario: Generating calibrated reference for pressure sensor signal conditioning in battery-powered infusion pump.

IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADC front-end, directly tied to sensor bridge excitation.

Use Value: 100 ppm/°C drift contributes <0.1% FS error over 0–40 °C operating range-within medical device accuracy requirement.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACZ	Higher minimum cathode current (1 mA), wider tempco (50–100 ppm/°C), no AEC-Q100 qualification	Not suitable for automotive under-hood use; requires higher bias current in low-power designs	Select only for cost-sensitive industrial applications where AEC-Q100 and sub-mA operation are not required.
MAX6008AEUR+T	Fixed 2.048 V output, SOT23-3 package, 20 ppm/°C tempco, 15 µA quiescent current	Lacks adjustability; optimized for low-power fixed-reference applications like sensor excitation	Choose when fixed output and ultra-low current dominate over flexibility and automotive compliance.

Compared with TL431ACZ and MAX6008AEUR+T, TS431IZ-AP uniquely combines AEC-Q100 qualification, 60 µA I_min, and 1.24–6 V adjustability-making it the only viable option for automotive isolated feedback where both low-current startup and wide output range are mandatory.

Availability

TS431IZ-AP is available at Aetrix Electronics and suitable for AC-DC adapter feedback, automotive body control modules, and industrial PLC power monitors requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TS431IZ-AP 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 high-reliability feedback regulation in isolated power supplies and automotive control units where accuracy, thermal stability, and qualification compliance are non-negotiable.

FAQ

What is the minimum cathode current required for regulation in TS431IZ-AP?

The TS431IZ-AP requires a minimum cathode current of 60 µA to maintain regulation, as specified in Table 2 of the datasheet under "Operating Conditions." This value is guaranteed across the full −40 °C to +125 °C temperature range and enables reliable startup in low-power automotive modules where bias current is tightly constrained.

Can TS431IZ-AP replace TL431 in existing designs?

TS431IZ-AP can replace TL431 in most TO92-based designs, but requires verification of cathode current margin: TL431 needs ≥1 mA, while TS431IZ-AP regulates down to 60 µA. Resistor values may need adjustment to ensure the new part operates within its 1.24–6 V output range and 60 µA–30 mA cathode current window.

Is TS431IZ-AP qualified for automotive applications?

Yes-TS431IZ-AP is AEC-Q100 qualified for Grade 1 (−40 °C to +125 °C) per the June 2018 datasheet revision. It undergoes stress testing including HTOL, TC, and ESD per AEC-Q100 Rev H, and is marked with automotive-specific order codes (e.g., TS431IYLT variants).

How does TS431IZ-AP handle capacitive loads in feedback circuits?

TS431IZ-AP is inherently stable with any capacitive load, as confirmed in Section 4 of the datasheet and Figure 14 (phase/gain vs. frequency). Unlike TL431, it requires no series resistor or compensation capacitor when driving optocouplers or high-capacitance nodes-simplifying layout and improving transient response.

TS431IZ-AP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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

Series:: -

Packaging:: Tape & Box (TB)

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:: ±2%

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

TS431IZ-AP FAQ

1.How can I place an order for TS431IZ-AP through Aetrix?

Please submit a Request for Quotation (RFQ) for TS431IZ-AP 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 TS431IZ-AP reliable?

The price and inventory of TS431IZ-AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS431IZ-AP is usually 5 days.

3.What payment methods are accepted for TS431IZ-AP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS431IZ-AP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS431IZ-AP?

TS431IZ-AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS431IZ-AP 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 TS431IZ-AP?

For technical support, including TS431IZ-AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS431IZ-AP requirements.

6.How does Aetrix verify that TS431IZ-AP is sourced from the original manufacturer or authorized distributors?

All TS431IZ-AP 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 TS431IZ-AP meets industry standards.

7.What is the process for return or replacement of TS431IZ-AP?

All TS431IZ-AP units undergo pre-shipment inspection (PSI). If there is an issue with TS431IZ-AP, 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 TS431IZ-AP part is unused and in its original packaging.

Return procedure for TS431IZ-AP:

1.Submit a request within 90 days.

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

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