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Diodes Incorporated AP431AYG-13
- Part No.:
- AP431AYG-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431AYG-13.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,804
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Product details
Overview
AP431AYG-13 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 2.495V ±0.5% reference voltage, 0.2Ω dynamic output impedance, and 200mA sink current capability. It operates from 2.495V to 36V output via external resistor divider and is used in feedback loops of isolated DC-DC converters, voltage monitors, and current sources.
For engineers reviewing the AP431AYG-13 datasheet, AP431AYG-13 pinout, AP431AYG-13 application, or AP431AYG-13 equivalent, key selection criteria include reference tolerance (±0.5%), cathode current range (0.19–250mA), temperature coefficient (30ppm/°C), and SOT89 package thermal performance (800mW PD).
Technical Context
The AP431AYG-13 implements a bandgap-based precision reference with active output circuitry enabling sharp turn-on and low dynamic impedance. Its internal error amplifier compares REF pin voltage to 2.495V reference and drives the cathode-anode path to maintain regulation.
It functions as a programmable shunt element: when configured with R1/R2 resistors, VOUT = VREF(1 + R1/R2); minimum cathode current for regulation is 0.19mA, and off-state leakage is ≤1.0µA at 36V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% - enables stable feedback without trim potentiometer in most designs |
| Sink Current Range | 0.19mA to 200mA - supports regulation across light-load standby and full-output conditions |
| Dynamic Output Impedance | 0.2Ω typical - ensures minimal output voltage deviation under load transients |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV drift over −20°C to +85°C operating range |
| Max Cathode Voltage | +36V - allows use in 24V industrial rails and flyback secondary-side sensing |
| Min Cathode Current | 0.19mA - defines lowest usable bias current for stable regulation |
| Output Noise | Low - supports clean reference in ADC references and precision current sources |
Pinout & Package
AP431AYG-13 is supplied in RoHS-compliant, halogen-free SOT89 package (3-pin, single-ended leadframe) with 800mW power dissipation rating and thermal resistance θJA ≈ 150°C/W. Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = REF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current return path | Connected to system ground or low-side return; carries full cathode current minus REF current |
| Pin 2 (Cathode) | Regulated output node | Connected to feedback point (e.g., optocoupler LED anode); sinks current to maintain VREF at Pin 3 |
| Pin 3 (REF) | Precision reference input | High-impedance node (IREF ≤3.5µA); forms voltage divider with R1/R2 to set output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495V to 36V using two external resistors - eliminates need for multiple fixed-voltage regulators |
| Sharp turn-on response | Fast regulation onset due to active output stage - improves transient immunity vs. Zener diodes |
| Low reference input current | 1.4–3.5µA typical - minimizes resistor-divider power loss and voltage error |
| Stable over temperature | 30ppm/°C TC and ±8mV max VREF drift from −20°C to +85°C - enables untrimmed designs |
| Green packaging | SOT89 meets RoHS, halogen-free (<900ppm Br/Cl), and antimony-free standards - compliant for global industrial shipments |
Applications
| Isolated Flyback Converter Feedback | Voltage Monitor / Window Detector |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in AC-DC adapters with optocoupler feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise reference to optocoupler LED, closing control loop across isolation barrier. Use Value: ±0.5% VREF tolerance ensures <±1% output voltage accuracy without post-production calibration. |
Use Scenario: Detecting overvoltage and undervoltage conditions on 12V automotive rail. IC Role / Device Role / Timing Role: Dual-threshold comparator formed by two AP431AYG-13 units with resistor dividers. Use Value: 30ppm/°C tempco maintains detection thresholds within ±50mV over −20°C to +85°C ambient. |
| Constant-Current LED Driver | Programmable Current Limiter |
|
Use Scenario: Driving high-brightness LEDs in signage with thermal foldback. IC Role / Device Role / Timing Role: Shunt regulator sinking current through sense resistor to fix LED current. Use Value: 0.2Ω dynamic impedance ensures current stability despite input ripple up to 100kHz. |
Use Scenario: Protecting USB-C power delivery circuits from overcurrent faults. IC Role / Device Role / Timing Role: Precision shunt element in adjustable current-limit foldback circuit. Use Value: 200mA sink capability and 0.19mA min regulation current enable accurate 100mA–1.5A limit setting. |
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 | ±1% VREF, SO-8 package, 100mA IK max, higher 0.3Ω ZKA | Limited to lower-power feedback; requires PCB area for SO-8 vs. SOT89 thermal efficiency | Choose if SO-8 footprint already standardized and ±1% tolerance acceptable |
| AS431ATZ | Same ±0.5% VREF, SC59 package, 400mW PD, 0.22Ω ZKA, same pinout as AP431 | Lower power dissipation margin; less suitable for >150mA continuous sink | Choose only for space-constrained layouts where SOT89 thermal mass is unnecessary |
Compared with TL431ACDBVR and AS431ATZ, AP431AYG-13 delivers superior thermal performance (800mW vs. 400–600mW), tighter reference tolerance than TL431, and higher sink current headroom than AS431ATZ-making it optimal for high-reliability, medium-power shunt regulation.
Availability
AP431AYG-13 is available at Aetrix Electronics and suitable for isolated DC-DC converter feedback, voltage monitoring systems, constant-current LED drivers, and programmable current limiters requiring stable component supply across industrial and consumer production cycles.
Supply support for AP431AYG-13 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 devices, with design centers in Asia, Europe, and the U.S., serving industrial, computing, and consumer markets.
AP431AYG-13 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy voltage reference and feedback applications in power conversion, protection, and sensing circuits.
FAQ
What is the maximum cathode voltage rating for AP431AYG-13?
The absolute maximum cathode voltage is +36V. Exceeding this risks permanent damage. In normal operation, cathode voltage must remain ≥VREF (2.495V) for regulation; typical applications operate between 3.3V and 24V. Derating is recommended above 85°C ambient.
Can AP431AYG-13 replace a Zener diode directly?
Yes-AP431AYG-13 serves as a precision, low-impedance Zener replacement. Unlike passive Zeners, it provides sharp turn-on, programmable voltage via resistors, and ±0.5% reference accuracy. No additional biasing is needed beyond the R1/R2 divider network.
What is the minimum cathode current required for regulation?
The minimum cathode current for stable regulation is 0.19mA (190µA) at TA = +25°C, rising to 0.50mA over full temperature range. Below this, regulation degrades; ensure external circuit supplies sufficient current even at light loads.
Does AP431AYG-13 require an output capacitor for stability?
No bulk output capacitor is required for basic regulation, but stability depends on load capacitance and series resistance. Per Figure 8 in DS31002, oscillation may occur with CL >10µF unless series resistance ≥150Ω is added. For crowbar or timer applications, RC networks must be sized per stability boundary curves.
AP431AYG-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 200 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 500 µA
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP431AYG-13 FAQ
1.How can I place an order for AP431AYG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431AYG-13 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 AP431AYG-13 reliable?
The price and inventory of AP431AYG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431AYG-13 is usually 5 days.
3.What payment methods are accepted for AP431AYG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431AYG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431AYG-13?
AP431AYG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431AYG-13 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 AP431AYG-13?
For technical support, including AP431AYG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431AYG-13 requirements.
6.How does Aetrix verify that AP431AYG-13 is sourced from the original manufacturer or authorized distributors?
All AP431AYG-13 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 AP431AYG-13 meets industry standards.
7.What is the process for return or replacement of AP431AYG-13?
All AP431AYG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP431AYG-13, 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 AP431AYG-13 part is unused and in its original packaging.
Return procedure for AP431AYG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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