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

Diodes Incorporated ZR431F01TA

Name: ZR431F01TA
Brand: Diodes Incorporated
SKU: ZR431F01TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR431F01TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZR431F01TA.pdf

Description:: IC VREF SHUNT ADJ 1% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:68,942

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Product details

Overview

ZR431F01TA from Diodes Incorporated is a three-terminal adjustable precision shunt regulator in SOT23 package, offering 1% initial tolerance, 72ppm/°C max temperature coefficient, and 50μA–100mA cathode current capability. It replaces discrete Zener diodes in voltage reference, overvoltage protection, and switch-mode power supply feedback loops where stable 2.5–20V programmable output is required.

For engineers reviewing the ZR431F01TA datasheet, ZR431F01TA pinout, ZR431F01TA application, or ZR431F01TA equivalent, this page delivers verified electrical specs, SOT23 terminal mapping, real-world use cases in shunt regulation and undervoltage detection, and validated alternative parts with documented tolerance and package differences.

Technical Context

The ZR431F01TA operates as a two-input, one-output shunt reference: its REF pin senses a resistive divider voltage, while the cathode (K) sinks current to maintain VREF = 2.50V ±1% at 10mA. Its internal bandgap core enables stable operation across –40°C to +125°C without external compensation.

Dynamic impedance is ≤0.75Ω at VZ = VREF, and ΔVREF over full temperature range is ≤30mV. The device exhibits low output noise and supports open-loop gain >60dB up to 10kHz, enabling fast transient response in feedback-controlled regulators.

Key Specifications

Parameter	Value and Actual Design Meaning
VREF	2.50V ±1% at 10mA - sets precise reference point for resistor-programmed output voltages from 2.5V to 20V
Tempco	≤72ppm/°C - ensures <±30mV drift over –40°C to +125°C, critical for industrial temperature stability
I_Z(MIN)	35–50µA - minimum cathode current needed to enter regulation, enabling ultra-low-power monitoring circuits
R_Z	≤0.75Ω - low dynamic impedance maintains tight output regulation under load transients in SMPS feedback paths
I_Z Range	50µA to 100mA - wide sink current range supports both low-power sensing and higher-current shunt regulation
V_Z Max	20V - maximum cathode-to-ground voltage defines safe operating ceiling for overvoltage clamp designs

Pinout & Package

Package: SOT23 - surface-mount, 3-pin, lead-free, RoHS-compliant package with 0.915mm typical body height and 2.40mm length (JEDEC TO-236AB).

Pin/Terminal	Circuit Role	Design Meaning
K (Cathode)	Current sink node	Connects to regulated rail; sinks all excess current to ground via external pass element or directly
A (Anode)	Ground reference	Low-impedance return path; must be tied to system ground for accurate reference establishment
REF	Reference input	Senses voltage divider output; regulates when V_REF = 2.50V ±1%; high-impedance (≤1.0µA I_REF) minimizes divider loading

Key Features

Feature	Design Value
Adjustable output voltage	Programmable 2.5–20V via two external resistors - eliminates need for multiple fixed Zener values
Temperature-compensated core	Bandgap-derived reference with ≤30mV total deviation over –40°C to +125°C - no external compensation required
Low quiescent current	I_REF ≤1.0µA - enables high-resistance divider networks, reducing power loss in battery-powered monitors
Stable under capacitive loads	Operates stably with ≥10pF to 1µF load capacitance - simplifies layout in noisy power supply environments
Automotive-ready variants available	AEC-Q100 qualified versions exist (e.g., ZR431xTA-A) - supports functional safety-critical voltage supervision in automotive ECUs

Applications

Shunt Voltage Regulation

Overvoltage Protection

Use Scenario: Stabilizing 12V rail in industrial PLC I/O module using external PNP transistor as pass element.

IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5V threshold to control base drive of series pass transistor.

Use Value: Maintains ±1.2% output accuracy over temperature vs. ±5% typical for 12V Zener diodes.

Use Scenario: Detecting >15.5V condition on automotive 12V battery line to trigger crowbar circuit.

IC Role / Device Role / Timing Role: Adjustable threshold comparator reference with hysteresis enabled via resistor network.

Use Value: Enables exact trip point setting (e.g., 15.5V = 2.5V × (1 + 5.2kΩ/1kΩ)) without trimming.

SMPS Feedback Reference

Undervoltage Lockout (UVLO)

Use Scenario: Secondary-side voltage sensing in isolated flyback converter powering telecom equipment.

IC Role / Device Role / Timing Role: Precision reference for optocoupler-driven feedback loop regulating 5V/3.3V outputs.

Use Value: Low R_Z (≤0.75Ω) and fast pulse response (<1µs) minimize output ripple and improve load step recovery.

Use Scenario: Enabling microcontroller reset when 3.3V LDO output drops below 2.97V during brownout.

IC Role / Device Role / Timing Role: Programmable threshold detector feeding comparator input; REF pin biased by resistive divider from monitored rail.

Use Value: 1% tolerance ensures UVLO triggers within ±29.7mV of setpoint, meeting IEC 61000-4-11 immunity requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDBVR (TI)	2.495V ±0.5% reference, SO-8 package, 100mA I_Z, 0.22Ω R_Z	Higher precision but larger footprint; requires PCB area not suitable for space-constrained SOT23 layouts	Select when tighter initial tolerance (0.5%) and lower R_Z outweigh size constraints
KA431AZTA (ON Semiconductor)	2.5V ±2%, SOT23 package, 100mA I_Z, 0.9Ω R_Z, 100ppm/°C tempco	Lower cost but looser tolerance and higher tempco - acceptable for non-critical biasing or LED current control	Select for cost-sensitive consumer power supplies where ±2% output tolerance is permissible

Compared with TL431ACDBVR and KA431AZTA, ZR431F01TA delivers optimal balance of 1% precision, SOT23 compactness, and 72ppm/°C stability-making it preferred for industrial power monitors and space-limited SMPS feedback where performance and footprint are both critical.

Availability

ZR431F01TA is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery management systems, and telecom DC-DC converters requiring stable component supply with guaranteed long-term continuity.

Supply support for ZR431F01TA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

ZR431 belongs to Diodes' precision reference product line, engineered specifically for applications demanding stable, programmable shunt regulation with minimal external components and robust thermal performance.

FAQ

What is the minimum cathode current required for ZR431F01TA to regulate?

The ZR431F01TA requires a minimum cathode current (I_Z(MIN)) of 35–50µA to maintain regulation at VREF = 2.50V. This value is specified at full temperature range and ensures stable operation even in low-power monitoring circuits where divider currents are minimized.

Can ZR431F01TA replace a standard Zener diode directly?

Yes - ZR431F01TA can directly replace Zener diodes in shunt regulator configurations, but requires two external resistors to set the output voltage. Unlike passive Zeners, it provides superior temperature stability (≤72ppm/°C), tighter tolerance (±1%), and lower dynamic impedance (≤0.75Ω), improving overall system accuracy.

Is ZR431F01TA suitable for automotive applications?

The base ZR431F01TA is not AEC-Q100 qualified, but Diodes offers automotive-grade variants (e.g., ZR431F01TA-A) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. For non-safety-critical automotive subsystems, the standard part may be used with customer qualification.

How does the REF pin's input current affect resistor selection?

The REF pin draws ≤1.0µA (typical 0.12µA), allowing high-value resistor dividers (e.g., 100kΩ + 10kΩ) without significant loading error. This enables low-power operation and reduces heat generation in battery-powered voltage monitors compared to Zeners requiring ≥1mA bias current.

ZR431F01TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Adjustable

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: 20 V

Current - Output:: 100 mA

Tolerance:: ±1%

Temperature Coefficient:: 55ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 50 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZR431F01TA FAQ

1.How can I place an order for ZR431F01TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR431F01TA 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 ZR431F01TA reliable?

The price and inventory of ZR431F01TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR431F01TA is usually 5 days.

3.What payment methods are accepted for ZR431F01TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR431F01TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR431F01TA?

ZR431F01TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR431F01TA 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 ZR431F01TA?

For technical support, including ZR431F01TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR431F01TA requirements.

6.How does Aetrix verify that ZR431F01TA is sourced from the original manufacturer or authorized distributors?

All ZR431F01TA 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 ZR431F01TA meets industry standards.

7.What is the process for return or replacement of ZR431F01TA?

All ZR431F01TA units undergo pre-shipment inspection (PSI). If there is an issue with ZR431F01TA, 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 ZR431F01TA part is unused and in its original packaging.

Return procedure for ZR431F01TA:

1.Submit a request within 90 days.

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

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