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

Diodes Incorporated AP431SHAZTR-G1

Name: AP431SHAZTR-G1
Brand: Diodes Incorporated
SKU: AP431SHAZTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP431SHAZTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: AP431SHAZTR-G1.pdf

Description:: IC VREF SHUNT ADJ 0.5% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:3,399

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Product details

Overview

AP431SHAZTR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (2.495V), low 50μA typical minimum cathode current for regulation, 0.1Ω typical dynamic impedance, and operation from -40°C to +125°C. It replaces Zener diodes in feedback loops of switching power supplies, USB-C chargers, and precision voltage references where low-power regulation and thermal stability are critical.

For engineers reviewing the AP431SHAZTR-G1 datasheet, AP431SHAZTR-G1 pinout, AP431SHAZTR-G1 application, or AP431SHAZTR-G1 equivalent, this page delivers verified electrical specs, TO-92 package terminal mapping, real-world use cases in charger feedback and 5V/1A regulators, and validated alternatives with documented parameter-level differences.

Technical Context

The AP431SHAZTR-G1 implements a bandgap-referenced error amplifier with sharp turn-on characteristics and low temperature coefficient (11mV typical deviation over -40°C to +125°C). Its internal architecture enables stable regulation down to 50μA cathode current while maintaining 0.1Ω dynamic impedance across 1mA–100mA sink range.

It operates as a 2.495V reference with programmable output up to 36V via external resistor divider, supports capacitive loads without oscillation up to 100μF, and features high immunity to cathode voltage variation (ΔVREF/ΔVKA ≤ –2.7mV/V).

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.495V ±0.5% at +25°C - sets precise feedback threshold for output voltage programming
Min Cathode Current	50μA typical - enables regulation in ultra-low-power standby or light-load modes
Dynamic Impedance	0.1Ω typical - ensures minimal output voltage shift under load transients
Temp Stability	±11mV over -40°C to +125°C - maintains accuracy across automotive and industrial ambient ranges
Sink Current Range	100μA to 100mA - supports both signal-level error detection and high-current feedback paths
Cathode Voltage Max	36V - allows direct use in 24V system rails and wide-input SMPS designs
Package	TO-92 (Ammo Packing) - through-hole mounting compatible with legacy PCB assembly and prototyping

Pinout & Package

AP431SHAZTR-G1 is supplied in TO-92 (Ammo Packing) package with 3 leads: Pin 1 = REF (reference input), Pin 2 = ANODE (ground connection), Pin 3 = CATHODE (regulated output node). Thermal resistance θ_JC is 80°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 (REF)	Reference input	High-impedance node sensing voltage divider output; draws only 0.2–0.5μA
2 (ANODE)	Anode (ground)	Common return path for reference and cathode current; must be low-impedance ground
3 (CATHODE)	Cathode (output)	Sinks regulated current into feedback network; connects to optocoupler LED or error amplifier input

Key Features

Feature	Design Value
Low regulation current	50μA typical minimum cathode current enables <100μW quiescent power in feedback circuits
Programmable output	V_OUT = (1 + R1/R2) × 2.495V - supports 2.5V to 36V setpoints with standard resistors
Capacitive load stability	Stable with ≥100μF output capacitance - eliminates need for external compensation in adapter designs
Thermal drift control	11mV max ΔV_REF over full temperature range - reduces calibration burden in automotive modules
RoHS/Green compliance	Totally lead-free, halogen- and antimony-free - meets IPC-1752A material declaration requirements

Applications

USB-C PD Charger Feedback

Industrial 24V-to-5V SMPS

Use Scenario: Regulates 5V/3A output in isolated flyback converter using optocoupler-coupled feedback loop.

IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.495V reference to drive optocoupler LED; defines output voltage accuracy.

Use Value: 0.5% V_REF tolerance and 50μA I_K(min) ensure tight output regulation (<±1%) and fast light-load response in no-load standby mode.

Use Scenario: Stabilizes 5V rail in DIN-rail mounted 24V input industrial power supply with 1A load.

IC Role / Device Role / Timing Role: Adjustable shunt reference in secondary-side error amplifier circuit; compensates for transformer winding resistance and diode drop.

Use Value: 36V cathode rating and -40°C to +125°C operation allow direct integration into high-temp enclosures without derating.

PCIe Graphics Card VRM Monitor

Precision 5V/1A Linear Reference

Use Scenario: Monitors 5V auxiliary rail on GPU board using resistor-divider + AP431SHAZTR-G1 + comparator.

IC Role / Device Role / Timing Role: Precision voltage reference generating stable threshold for overvoltage protection circuit.

Use Value: 0.1Ω dynamic impedance prevents false triggering during GPU load transients; 11mV temp drift avoids thermal false alarms.

Use Scenario: Generates clean 5.00V reference for ADC biasing in test equipment using (R1=10kΩ, R2=9.96kΩ) divider.

IC Role / Device Role / Timing Role: Programmable shunt regulator configured as fixed 5.00V source with 0.5% absolute accuracy.

Use Value: TO-92 through-hole package simplifies hand-soldered calibration; low 50μA I_K(min) minimizes self-heating error in precision metrology.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431BIDBZR	2.495V reference, 1% tolerance, 100μA min cathode current, SOT23-3 package	Higher min cathode current increases standby power; surface-mount only limits prototyping flexibility	Select when SMT volume production and cost sensitivity outweigh low-power and through-hole advantages
AS431AZTR-E1	2.500V reference, 0.5% tolerance, 60μA min cathode current, TO-92 package	0.005V higher V_REF shifts programmed output by ~0.2%; identical thermal drift and dynamic impedance	Choose when existing BOM uses AS431 series and 5mV V_REF offset is acceptable in final calibration

Compared with TL431BIDBZR, AP431SHAZTR-G1 delivers 50μA vs. 100μA min cathode current and TO-92 compatibility for manual assembly; versus AS431AZTR-E1, it offers tighter 2.495V matching for USB-C 5V tolerance compliance but requires revalidation of resistor divider ratios.

Availability

AP431SHAZTR-G1 is available at Aetrix Electronics and suitable for USB-C PD charger feedback, industrial 24V-to-5V SMPS, and PCIe graphics card VRM monitor applications requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP431SHAZTR-G1 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and product lines qualified for automotive, industrial, and computing markets.

AP431SHAZTR-G1 belongs to Diodes' precision shunt regulator product line, engineered specifically for high-accuracy, low-quiescent-current feedback in isolated DC-DC converters and voltage monitoring systems.

FAQ

What is the maximum cathode voltage rating for AP431SHAZTR-G1?

The absolute maximum cathode voltage (V_KA) is 40V, with recommended continuous operation up to 36V. Exceeding 36V risks exceeding power dissipation limits in TO-92 package, especially above 25°C ambient. Derating curves in DS39195 Rev. 3-2 show safe operating area collapses rapidly above 36V at >85°C junction temperature.

Can AP431SHAZTR-G1 replace TL431 in existing designs without modification?

Yes, for most applications - it shares identical pinout, reference voltage (2.495V vs. TL431's 2.495V), and functional block diagram. However, its 50μA min cathode current is half that of standard TL431 (100μA), so existing resistor dividers may require adjustment to ensure regulation remains active under light loads.

Does AP431SHAZTR-G1 require an external capacitor for stability?

No external capacitor is required for basic regulation stability. The device is characterized stable with capacitive loads up to 100μF per Figure 12 in DS39195 Rev. 3-2. However, a 1nF ceramic capacitor between REF and ANODE is recommended in noisy environments to suppress high-frequency coupling into the reference node.

What does the "G1" suffix indicate in AP431SHAZTR-G1?

The "G1" suffix denotes Diodes Incorporated's Green compliance designation: fully lead-free, halogen-free (<900ppm Br/Cl, <1000ppm Sb), and compliant with EU RoHS 2015/863/EU (RoHS 3). It also indicates tape-and-reel packaging for automated assembly, though AP431SHAZTR-G1 uses ammo packing per ordering table - confirming "TR" refers to carrier type, not physical tape format.

AP431SHAZTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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

Series:: -

Packaging:: Cut Tape (CT)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Adjustable

Voltage - Output (Min/Fixed):: 2.495V

Voltage - Output (Max):: 36 V

Current - Output:: 100 mA

Tolerance:: ±0.5%

Temperature Coefficient:: -

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 100 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

AP431SHAZTR-G1 FAQ

1.How can I place an order for AP431SHAZTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP431SHAZTR-G1 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 AP431SHAZTR-G1 reliable?

The price and inventory of AP431SHAZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431SHAZTR-G1 is usually 5 days.

3.What payment methods are accepted for AP431SHAZTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431SHAZTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP431SHAZTR-G1?

AP431SHAZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP431SHAZTR-G1 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 AP431SHAZTR-G1?

For technical support, including AP431SHAZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431SHAZTR-G1 requirements.

6.How does Aetrix verify that AP431SHAZTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP431SHAZTR-G1 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 AP431SHAZTR-G1 meets industry standards.

7.What is the process for return or replacement of AP431SHAZTR-G1?

All AP431SHAZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431SHAZTR-G1, 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 AP431SHAZTR-G1 part is unused and in its original packaging.

Return procedure for AP431SHAZTR-G1:

1.Submit a request within 90 days.

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

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