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Diodes Incorporated AP431YL-13
- Part No.:
- AP431YL-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431YL-13.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,267
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Product details
Overview
AP431YL-13 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 2.495V ±1% 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-limiting circuits.
For engineers reviewing the AP431YL-13 datasheet, AP431YL-13 pinout, AP431YL-13 application, or AP431YL-13 equivalent, this device serves as a Zener diode replacement requiring precise voltage regulation, low temperature drift (30ppm/°C), stable cathode current control down to 300μA, and compatibility with SOT89 thermal performance in power supply feedback paths.
Technical Context
The AP431YL-13 implements an internal bandgap reference and high-gain transconductance amplifier driving an NPN pass transistor, enabling sharp turn-on and programmable regulation without external compensation. Its reference input draws only 1.4–3.5μA and maintains ±1% accuracy across –20°C to +85°C.
Dynamic output impedance remains at 0.2Ω up to 15mA cathode current variation, supporting stable loop response in flyback and forward converter feedback networks. The device achieves 8mV max reference deviation over full temperature range and exhibits <1μA off-state current at 36V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% - sets minimum programmable output; enables fixed-voltage or adjustable regulation without trim potentiometer |
| Sink Current Capability | 200mA - supports high-current feedback paths in >10W isolated supplies without external amplification |
| Dynamic Output Impedance | 0.2Ω - ensures minimal output voltage shift under load transients, critical for tight-regulation SMPS designs |
| Min Cathode Current | 300μA - allows operation with high-value feedback resistors, reducing standby power in energy-efficient converters |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV reference drift over –20°C to +85°C, suitable for industrial-grade power systems |
| Operating Temp Range | –20°C to +85°C - validated for extended commercial environments including industrial power adapters and LED drivers |
| Package | SOT89 - thermally robust 3-pin surface-mount package with 800mW power dissipation rating at +25°C ambient |
Pinout & Package
SOT89 package: 3-pin single-ended surface-mount outline with exposed thermal pad (non-electrical), 1.4–1.6mm body height, and 4.4–4.6mm length. Designed for PCB heat sinking in medium-power shunt regulation applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current return path | Connected to system ground or negative rail; completes cathode-to-anode current loop for regulation |
| Pin 2 (Cathode) | Output node / error amplifier output | Drives optocoupler LED or voltage divider; sinks up to 200mA; voltage setpoint determined by REF-to-CATHODE potential |
| Pin 3 (REF) | Reference input | High-impedance (≤3.5μA) node sensing divided output voltage; regulates when REF = 2.495V; controls CATHODE conduction |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference tolerance | ±1% at 25°C - eliminates need for post-production trimming in cost-sensitive AC-DC adapters |
| Low dynamic output impedance | 0.2Ω - maintains regulation stability during rapid load steps in constant-voltage/constant-current LED drivers |
| Sharp turn-on response | Sub-microsecond rise time - prevents overshoot in crowbar and overvoltage protection circuits |
| Programmable output range | 2.495V to 36V - supports universal input (85–265VAC) SMPS feedback across multiple output voltages with one BOM item |
| Lead-free & halogen-free | RoHS 2 compliant, Br/Cl <900ppm, Sb <1000ppm - meets IPC-1752A material declaration requirements for global OEMs |
Applications
| Isolated Flyback Converter Feedback | Voltage Monitor Circuit |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 12V/24V offline flyback converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.495V reference to bias optocoupler LED; cathode current modulates primary-side PWM duty cycle. Use Value: Enables ±1% output regulation across line/load/temperature without secondary-side LDO, reducing component count and BOM cost. |
Use Scenario: Dual-threshold detection for battery pack overvoltage/undervoltage alarms in portable medical devices. IC Role / Device Role / Timing Role: Precision reference source for comparator inputs; REF pin compares divided battery voltage against 2.495V threshold. Use Value: Achieves 20mV detection resolution using standard 1% resistors, eliminating need for dedicated voltage monitor ICs. |
| Constant-Current LED Driver | Crowbar Overvoltage Protection |
|
Use Scenario: Linear current sink for high-brightness LED strings in architectural lighting with dimming interface. IC Role / Device Role / Timing Role: Adjustable shunt regulating current through sense resistor; REF pin sets current via IOUT = VREF/RSENSE. Use Value: Delivers 1% current accuracy over temperature, replacing discrete op-amp + MOSFET solutions with single SOT89 device. |
Use Scenario: Fast-acting overvoltage clamp on 5V rail protecting FPGA I/O banks during power-up sequencing faults. IC Role / Device Role / Timing Role: Trigger element in SCR-gated crowbar; REF senses rail voltage; cathode surge current fires SCR when threshold exceeded. Use Value: Responds within 1μs to overvoltage events up to 36V, preventing latch-up in sensitive logic interfaces. |
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, 70ppm/°C tempco, SO-8 package, 100mA sink current | Limited to lower-power feedback; requires larger footprint; higher tempco increases drift in wide-temp industrial use | Select when tighter initial tolerance is required and thermal budget permits SO-8 mounting |
| AS431AZTR-E1 | Same 2.495V ±1% spec, but rated for –40°C to +125°C; SC59 package; 100mA sink current | Extended temperature support suits automotive under-hood applications; lower current limits use in high-power converters | Select for AEC-Q100-qualified designs where ambient exceeds +85°C or automotive qualification is mandatory |
Compared with TL431BIDBZR and AS431AZTR-E1, AP431YL-13 offers superior thermal performance in SOT89 (800mW vs. 600mW SO-8), lower tempco (30ppm/°C vs. 70ppm/°C), and higher sink current (200mA vs. 100mA), making it optimal for compact, high-efficiency industrial power supplies.
Availability
AP431YL-13 is available at Aetrix Electronics and suitable for isolated DC-DC converters, voltage monitoring systems, constant-current LED drivers, and crowbar protection circuits requiring stable component supply and RoHS-compliant sourcing.
Supply support for AP431YL-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection devices for industrial, computing, and consumer markets.
The AP431 series belongs to Diodes' precision reference product line, designed specifically for cost-sensitive, high-volume power supply feedback and voltage monitoring applications demanding ±1% accuracy and robust thermal performance.
FAQ
What is the maximum cathode voltage the AP431YL-13 can regulate?
The AP431YL-13 supports cathode voltages up to +36V absolute maximum, with guaranteed regulation performance across its full 2.495V to 36V programmable output range. This rating is validated per DS31002 Rev. 21–2 Absolute Maximum Ratings table and applies under continuous operation at TA = +25°C with appropriate PCB copper area for thermal dissipation in SOT89 package.
Can AP431YL-13 replace a Zener diode directly in existing designs?
Yes - AP431YL-13 functions as a 3-terminal Zener replacement: connect cathode to regulated node, anode to ground, and REF to voltage divider midpoint. Its 0.2Ω dynamic impedance and sharp turn-on provide superior regulation accuracy and transient response compared to standard Zeners, especially above 10mA load currents.
Does AP431YL-13 require external compensation for stability?
No external compensation is needed for basic shunt regulation. Stability boundaries are defined in DS31002 Figure 8 (Stability Boundary Conditions), showing stable operation with CL ≤ 100nF and R2 ≥ 1kΩ. For crowbar or comparator-mode use, consult Application Note AN78 for layout and timing guidance.
Is AP431YL-13 suitable for automotive applications?
AP431YL-13 is specified for –20°C to +85°C operation and RoHS-compliant, but is not AEC-Q100 qualified. For automotive under-hood use, Diodes recommends AS431AZTR-E1 (–40°C to +125°C, SC59) or AP431AWL-7 (SC59, same temp range). AP431YL-13 is appropriate for cabin-infotainment or non-safety-critical subsystems meeting extended commercial specs.
AP431YL-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:
- ±1%
- 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
AP431YL-13 FAQ
1.How can I place an order for AP431YL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431YL-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 AP431YL-13 reliable?
The price and inventory of AP431YL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431YL-13 is usually 5 days.
3.What payment methods are accepted for AP431YL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431YL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431YL-13?
AP431YL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431YL-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 AP431YL-13?
For technical support, including AP431YL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431YL-13 requirements.
6.How does Aetrix verify that AP431YL-13 is sourced from the original manufacturer or authorized distributors?
All AP431YL-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 AP431YL-13 meets industry standards.
7.What is the process for return or replacement of AP431YL-13?
All AP431YL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP431YL-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 AP431YL-13 part is unused and in its original packaging.
Return procedure for AP431YL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431YL-13 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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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
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