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

Diodes Incorporated ZR431F005-7

Name: ZR431F005-7
Brand: Diodes Incorporated
SKU: ZR431F005-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR431F005-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZR431F005-7.pdf

Description:: IC VREF SHUNT ADJ 0.5% SOT23

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZR431F005-7 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.5% initial tolerance, 2.5 V reference voltage, 55 ppm/°C max temperature coefficient, and 50 μA to 100 mA cathode current capability-used in voltage monitoring, over/under-voltage protection, and switch-mode power supply feedback loops.

For engineers reviewing the ZR431F005-7 datasheet, ZR431F005-7 pinout, ZR431F005-7 application, or ZR431F005-7 equivalent, key selection criteria include reference voltage accuracy, dynamic impedance (0.75 Ω), temperature stability, cathode current range, and SOT23 package compatibility for space-constrained designs.

Technical Context

The ZR431F005-7 operates as a programmable shunt reference with internal bandgap-derived 2.5 V reference and high-gain error amplifier. Its output voltage is set externally via two resistors between cathode, anode, and reference pins, enabling precise regulation from 2.5 V to 20 V.

It features temperature-compensated operation across –40°C to +85°C, low 0.12–1.0 μA reference input current, and stable performance under varying load and line conditions-verified by <17 mV reference deviation over full temperature range and –1.0 to –2.7 mV/V ΔVREF/ΔVZ ratio.

Key Specifications

Parameter	Value and Actual Design Meaning
V_REF	2.50 V ±0.5% - sets minimum programmable output voltage and defines regulation threshold accuracy
Tempco	≤55 ppm/°C - ensures ≤17 mV reference drift over –40°C to +85°C for stable long-term calibration
I_Z(MIN)	35–50 µA - minimum cathode current required to maintain regulation; enables low-power standby operation
R_Z	0.75 Ω - low dynamic impedance improves transient response and reduces output ripple in feedback paths
I_Z Range	50 µA to 100 mA - supports wide load current handling without external pass devices
V_Z Max	20 V - maximum cathode-to-anode voltage rating; defines upper limit of programmable output range
P_D (SOT23)	330 mW - thermal limit at 25°C ambient; derates linearly above 25°C per published curve

Pinout & Package

Package: SOT23 - surface-mount, 3-pin, lead-free, RoHS-compliant plastic package with 2.4 mm × 1.3 mm footprint and 0.915 mm height.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Cathode)	Current sink node	Connects to regulated output node; sinks up to 100 mA to maintain V_OUT = V_REF(1 + R1/R2)
Pin 2 (Anode)	Reference ground return	Common return path for reference input and cathode current; must be tied to system ground
Pin 3 (Ref)	Internal reference input	High-impedance (≤1.0 μA) node used with external resistor divider to program output voltage

Key Features

Feature	Design Value
Adjustable output voltage	Programmable from 2.5 V to 20 V using only two external resistors-eliminates need for multiple fixed-voltage zeners
Low reference input current	0.12–1.0 μA typical - minimizes resistor-divider power loss and improves accuracy in high-impedance feedback networks
Stable temperature performance	≤17 mV V_REF deviation over –40°C to +85°C - enables reliable operation in industrial environments without external compensation
Low-noise regulation	0.75 Ω dynamic impedance - suppresses high-frequency noise coupling into feedback loops of SMPS and precision references
Green packaging	Halogen-free molding compound and lead-free finish - meets RoHS Directive 2002/95/EC with all applicable exemptions

Applications

Shunt Voltage Regulation

Over/Under-Voltage Protection

Use Scenario: Stabilizing output of unregulated DC rails in low-power converters where space and BOM count are constrained.

IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise 2.5–20 V reference-based feedback to control output voltage.

Use Value: Replaces discrete zener diodes with 5× tighter tolerance and 10× lower tempco-reducing calibration drift in field-deployed equipment.

Use Scenario: Monitoring battery or supply voltage in portable electronics to trigger shutdown before overvoltage damage or deep discharge.

IC Role / Device Role / Timing Role: Precision threshold detector using resistor-divided input to compare against 2.5 V reference.

Use Value: Enables ±0.5% trip-point accuracy across temperature-critical for Li-ion battery protection circuits.

SMPS Feedback Reference

Series Regulator Control Element

Use Scenario: Secondary-side voltage sensing in isolated flyback or forward converters requiring tight output regulation.

IC Role / Device Role / Timing Role: Primary reference element in optocoupler-coupled feedback loop, setting output voltage via TL431-compatible topology.

Use Value: 0.75 Ω dynamic impedance ensures minimal phase shift in feedback path-improving loop stability without added compensation.

Use Scenario: Improving regulation and dropout behavior of linear regulators (e.g., 78xx) by replacing fixed reference with adjustable one.

IC Role / Device Role / Timing Role: Programmable reference source controlling base/gate drive of external pass transistor in series configuration.

Use Value: Enables custom output voltages (e.g., 3.3 V, 5.0 V, 12 V) with same regulator IC-reducing inventory and design variants.

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	2.495 V reference, ±1% tolerance, 92 ppm/°C max tempco, 100 mA I_Z max	Higher initial tolerance and tempco; requires larger external resistors for same accuracy	Preferred when cost sensitivity outweighs precision requirements and legacy design reuse is needed
KIA431AP	2.5 V reference, ±1% tolerance, 50 ppm/°C max tempco, 100 mA I_Z max, SOT23-3	Same package and basic function but lacks 0.5% grade and has no published R_Z spec	Acceptable for non-critical industrial monitoring where 1% tolerance is sufficient

Compared with TL431ACDBVR and KIA431AP, ZR431F005-7 delivers superior initial accuracy (0.5% vs. 1%), lower tempco (55 vs. 92 ppm/°C), and verified 0.75 Ω dynamic impedance-making it optimal for high-stability feedback, battery protection, and calibration-critical systems.

Availability

ZR431F005-7 is available at Aetrix Electronics and suitable for shunt regulation, over/under-voltage protection, and SMPS feedback applications requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.

Supply support for ZR431F005-7 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, application-optimized components for power management, signal integrity, and protection.

The ZR431 product line delivers precision shunt regulation with enhanced temperature stability and low-noise performance-designed specifically for feedback control, voltage monitoring, and protection circuits in industrial, computing, and consumer power systems.

FAQ

What is the minimum cathode current required for regulation in ZR431F005-7?

The ZR431F005-7 requires a minimum cathode current of 35–50 µA to maintain regulation, as specified in the Electrical Characteristics table under I_Z(MIN). This value is measured at V_Z = V_REF and ensures stable reference operation even in ultra-low-power configurations such as battery-backed monitoring circuits.

Can ZR431F005-7 replace a standard 5.1 V zener diode directly?

No-ZR431F005-7 is a three-terminal device requiring external resistors to set output voltage and cannot be dropped in place of a two-terminal zener. However, when configured with R1 = 10.2 kΩ and R2 = 10 kΩ, it achieves 5.1 V output with ±0.5% accuracy and far better temperature stability than a typical 5.1 V zener.

Does ZR431F005-7 require an output capacitor for stability?

No external capacitor is required for basic shunt regulation, but a 100 pF–1 nF capacitor across the reference pin and anode improves high-frequency noise immunity in SMPS feedback applications. Stability boundary data shows stable operation up to 1 µF load capacitance when used with appropriate series resistance per the datasheet's Figure 7.

Is ZR431F005-7 qualified for automotive applications?

ZR431F005-7 is not AEC-Q200 qualified and is rated for –40°C to +85°C operation-suitable for industrial and commercial environments. For automotive use, Diodes Incorporated offers the AEC-Q101-qualified AP431x family, which shares functional equivalence but includes extended temperature and stress testing compliance.

ZR431F005-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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

Series:: -

Packaging:: Strip

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Adjustable

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

Voltage - Output (Max):: 20 V

Current - Output:: 100 mA

Tolerance:: ±0.5%

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

ZR431F005-7 FAQ

1.How can I place an order for ZR431F005-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR431F005-7 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 ZR431F005-7 reliable?

The price and inventory of ZR431F005-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR431F005-7 is usually 5 days.

3.What payment methods are accepted for ZR431F005-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR431F005-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR431F005-7?

ZR431F005-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR431F005-7 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 ZR431F005-7?

For technical support, including ZR431F005-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR431F005-7 requirements.

6.How does Aetrix verify that ZR431F005-7 is sourced from the original manufacturer or authorized distributors?

All ZR431F005-7 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 ZR431F005-7 meets industry standards.

7.What is the process for return or replacement of ZR431F005-7?

All ZR431F005-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZR431F005-7, 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 ZR431F005-7 part is unused and in its original packaging.

Return procedure for ZR431F005-7:

1.Submit a request within 90 days.

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

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