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Diodes Incorporated AP431AYL-13
- Part No.:
- AP431AYL-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431AYL-13.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,170
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Product details
Overview
AP431AYL-13 from Diodes Incorporated is an adjustable precision shunt regulator with 2.495V ±1% reference voltage, 0.2Ω dynamic output impedance, and 200mA sink current capability. It operates over -20°C to +85°C and supports programmable output voltages from 2.495V to 36V using two external resistors-commonly deployed in feedback loops of isolated DC-DC converters and voltage monitor circuits.
For engineers reviewing the AP431AYL-13 datasheet, AP431AYL-13 pinout, AP431AYL-13 application, or AP431AYL-13 equivalent, key selection criteria include reference voltage tolerance, cathode current regulation threshold (300μA), temperature coefficient (30ppm/°C), and SOT89 thermal performance (800mW power dissipation).
Technical Context
The AP431AYL-13 implements a bandgap-based precision reference with active output circuitry enabling sharp turn-on characteristics. Its internal architecture delivers stable regulation across input voltage variations from VREF to 36V while maintaining low dynamic output impedance (0.2Ω typical) and minimal reference current drift (±1.2μA over temperature).
It functions as a 3-terminal programmable shunt: cathode sinks current to ground when REF-to-anode voltage exceeds 2.495V, enabling precise voltage sensing and error amplification in closed-loop power systems. The device requires no external compensation for basic regulation but exhibits defined stability boundaries with capacitive loads up to 100μF depending on series resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% - sets minimum programmable output; enables fixed-voltage or resistor-divider-adjusted regulation |
| Sink Current Capability | 200mA - determines maximum load current handling in shunt-mode configurations |
| Dynamic Output Impedance | 0.2Ω - ensures tight regulation under fast load transients; reduces output ripple sensitivity |
| Min Cathode Current | 300μA - defines lowest operating current for stable regulation; critical for low-power standby modes |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV drift over -20°C to +85°C; suitable for industrial-grade feedback accuracy |
| Power Dissipation | 800mW (SOT89) - supports higher continuous power vs. SOT23/SOT25; enables use in >1W converter designs |
| Operating Temp Range | -20°C to +85°C - validated for extended commercial environments; excludes automotive or industrial extremes |
Pinout & Package
AP431AYL-13 is packaged in RoHS-compliant, halogen-free SOT89 with exposed thermal pad (pin 2). This thermally enhanced package supports 800mW power dissipation and improves long-term reliability in high-ambient applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Reference return path | Connected to system ground or feedback node; completes reference loop with cathode and REF |
| 2 (Cathode) | Current sink terminal | Primary current-handling node; connects to transformer secondary or regulator output for error sampling |
| 3 (REF) | Precision voltage sense input | Monitors divided output voltage; triggers regulation when ≥2.495V; sets output via R1/R2 ratio |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495V to 36V using only two external resistors-eliminates need for multiple fixed-voltage regulators |
| Low reference current | 1.4–3.5μA typical - minimizes divider network power loss and improves light-load efficiency |
| Fast turn-on response | Sharp knee at regulation threshold - enables accurate overvoltage detection and fast transient recovery in SMPS feedback |
| Low output noise | Sub-mV RMS noise floor - preserves signal integrity in precision voltage monitoring and analog control loops |
| Lead-free & green packaging | SOT89 meets RoHS 2 and halogen-free standards (<900ppm Br/Cl, <1000ppm Sb) - compliant for eco-sensitive industrial deployments |
Applications
| Isolated DC-DC Converter Feedback | Voltage Monitor / Supervisor |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback path of flyback or forward converters to regulate output voltage across primary-secondary isolation barrier. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable 2.495V reference for error amplifier comparison; controls optocoupler LED current based on output deviation. Use Value: Enables ±1% output regulation without secondary-side LDO; reduces component count and improves cross-regulation in multi-output designs. | Use Scenario: Monitors battery or rail voltage to trigger shutdown or alert when crossing preset high/low thresholds. IC Role / Device Role / Timing Role: Adjustable comparator with built-in reference; compares divided input against internal VREF to drive MOSFET gate or logic signal. Use Value: Replaces discrete Zener + op-amp solutions; achieves 30ppm/°C threshold stability without trimming or calibration. |
| Constant-Current Sink | Crowbar Overvoltage Protection |
Use Scenario: Provides stable current source for LED biasing or sensor excitation where load voltage varies. IC Role / Device Role / Timing Role: Shunt regulator configured with single resistor between cathode and supply; sinks precise current independent of load voltage fluctuations. Use Value: Delivers 1% current accuracy over temperature; eliminates need for matched resistor networks or dedicated current-source ICs. | Use Scenario: Triggers SCR gate when output exceeds safe limit, shorting supply to protect downstream circuitry. IC Role / Device Role / Timing Role: High-speed shunt reference detecting overvoltage condition; drives SCR gate through series resistor upon threshold breach. Use Value: Responds within microseconds due to sharp turn-on; provides fail-safe hardware-level protection without microcontroller intervention. |
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 | ±0.5% reference tolerance, SO-8 package, 100mA max sink current | Limited thermal capacity vs. SOT89; lower max current restricts use in >5W converters | Select when tighter reference accuracy is required and power dissipation ≤400mW |
| AS431AZTR-E1 | Same 2.495V ±1% spec, SC59 package, 400mW power rating | Smaller footprint and lower thermal mass; less effective for sustained >150mA operation | Choose for space-constrained PCBs where peak current ≤100mA and ambient <70°C |
Compared with TL431BIDBZR and AS431AZTR-E1, AP431AYL-13 offers superior thermal performance (800mW) and higher sink current (200mA) in SOT89, making it optimal for medium-power isolated supplies and crowbar circuits where reliability under sustained load matters most.
Availability
AP431AYL-13 is available at Aetrix Electronics and suitable for isolated DC-DC converters, voltage supervision systems, and constant-current sink circuits requiring stable component supply and long-term manufacturability.
Supply support for AP431AYL-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 for power management, signal integrity, and connectivity applications.
The AP431/AP431A product line delivers precision shunt regulation for cost-sensitive, high-reliability power systems-designed specifically to replace Zener diodes in feedback, monitoring, and protection circuits across consumer, industrial, and telecom markets.
FAQ
What is the minimum cathode current required for regulation in AP431AYL-13?
The AP431AYL-13 requires a minimum cathode current of 300μA to maintain regulation. This value is guaranteed across the full operating temperature range (-20°C to +85°C) and ensures stable reference behavior even in ultra-low-power standby modes. Below this threshold, the device may exit regulation and exhibit increased output voltage drift.
Can AP431AYL-13 be used in place of a Zener diode?
Yes-AP431AYL-13 is explicitly designed as an improved replacement for Zener diodes in voltage reference, regulation, and error-sensing applications. Its 0.2Ω dynamic impedance, sharp turn-on, and ±1% reference tolerance provide significantly better regulation accuracy, temperature stability, and transient response than standard Zeners-especially above 2.495V.
Does AP431AYL-13 require external compensation for stability?
No external compensation is needed for basic shunt regulation. However, stability depends on output capacitance and series resistance: oscillation risk increases with >10μF capacitive loads unless series resistance exceeds 150Ω. Application Figure 9 in DS31002 shows verified stability boundaries for common configurations including crowbar and delay timer circuits.
What does the "YL-13" suffix indicate in AP431AYL-13?
The "YL-13" suffix denotes SOT89 package (Y), lead-free and green compliance (L), and 2500-piece tape-and-reel packaging (13). It confirms RoHS 2 and halogen-free status per Diodes Incorporated's definitions, with bromine/chlorine <900ppm and antimony <1000ppm-verified in manufacturing and documented in AP02007 packaging specifications.
AP431AYL-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
AP431AYL-13 FAQ
1.How can I place an order for AP431AYL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431AYL-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 AP431AYL-13 reliable?
The price and inventory of AP431AYL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431AYL-13 is usually 5 days.
3.What payment methods are accepted for AP431AYL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431AYL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431AYL-13?
AP431AYL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431AYL-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 AP431AYL-13?
For technical support, including AP431AYL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431AYL-13 requirements.
6.How does Aetrix verify that AP431AYL-13 is sourced from the original manufacturer or authorized distributors?
All AP431AYL-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 AP431AYL-13 meets industry standards.
7.What is the process for return or replacement of AP431AYL-13?
All AP431AYL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP431AYL-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 AP431AYL-13 part is unused and in its original packaging.
Return procedure for AP431AYL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431AYL-13 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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