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Diodes Incorporated AP431YG-13
- Part No.:
- AP431YG-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP431YG-13.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,632
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Product details
Overview
AP431YG-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, delivers sharp turn-on response, and replaces Zener diodes in feedback loops of AC/DC adapters and LED drivers.
For engineers reviewing the AP431YG-13 datasheet, AP431YG-13 pinout, AP431YG-13 application, or AP431YG-13 equivalent, key selection criteria include reference tolerance, cathode current range, temperature coefficient, package thermal performance, and compatibility with SOT89-based PCB layouts for high-current regulation.
Technical Context
The AP431YG-13 implements an internal bandgap reference and active error amplifier driving a high-gain NPN output stage, enabling precise regulation across -20°C to +85°C. Its 30ppm/°C equivalent full-range temperature coefficient ensures stable reference voltage under thermal cycling in industrial power supplies.
With 0.2Ω typical dynamic output impedance and 300μA minimum cathode current for regulation, it maintains tight output control even under light-load conditions. The device supports programmable output voltages up to 36V using only two external resistors, eliminating need for variable trimmers in cost-sensitive designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1% - sets base accuracy for all programmed output voltages |
| Sink Current Capability | 200mA - supports high-current shunt regulation without external pass transistor |
| Dynamic Output Impedance | 0.2Ω - minimizes output voltage deviation under load transients |
| Min Cathode Current | 300μA - enables stable regulation at ultra-light loads (e.g., standby mode) |
| Temp Coefficient | 30ppm/°C - ensures ≤±10mV drift over full -20°C to +85°C operating range |
| Output Voltage Range | 2.495V to 36V - programmable via resistor divider, no internal upper limit |
| Operating Temp Range | -20°C to +85°C - qualified for extended commercial environments including industrial SMPS |
Pinout & Package
SOT89 package: 3-pin surface-mount thermally enhanced outline with exposed anode pad for improved heat dissipation; pin 1 = Anode, pin 2 = Cathode, pin 3 = REF (reference input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current return path | Connected to system ground or low-side return; carries full cathode current |
| Pin 2 (Cathode) | Regulated output node | Connects to feedback point of switching converter or LED string cathode |
| Pin 3 (REF) | Reference voltage sense input | High-impedance input (1.4–3.5µA) used with resistor divider to set output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 2.495V ±1% tolerance eliminates need for post-production trimming |
| Low dynamic output impedance | 0.2Ω enables <10mV load regulation error across 1–200mA cathode current range |
| Fast turn-on response | Sharp knee characteristic allows clean startup in crowbar and overvoltage protection circuits |
| Programmable output voltage | Configurable from 2.495V to 36V using only two external resistors-no IC-level configuration required |
| Thermally robust SOT89 | 800mW power dissipation rating supports 150°C junction temperature in compact footprint |
Applications
| AC/DC Adapter Feedback | LED Constant-Current Sink |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters powering consumer electronics. IC Role / Device Role / Timing Role: Precision shunt reference providing feedback signal to optocoupler-driven primary controller. Use Value: ±1% reference tolerance enables ±2% output voltage accuracy without secondary-side compensation components. |
Use Scenario: High-brightness LED string current regulation in architectural lighting fixtures. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting constant current by sensing voltage drop across sense resistor. Use Value: 200mA sink capability directly drives LED strings up to 36V without external MOSFET, reducing BOM count. |
| Overvoltage Protection Circuit | Programmable Voltage Monitor |
|
Use Scenario: Crowbar circuit triggering SCR when DC bus exceeds safe threshold in motor drives. IC Role / Device Role / Timing Role: Precision comparator with built-in reference detecting overvoltage condition at cathode node. Use Value: 30ppm/°C tempco ensures trip point stability across ambient temperature swings, preventing false triggers. |
Use Scenario: Dual-threshold monitoring of battery pack voltage in portable medical devices. IC Role / Device Role / Timing Role: Configurable reference enabling high/low limit detection using resistor networks on REF pin. Use Value: Independent adjustment of upper and lower thresholds using separate R1/R2 dividers avoids dual IC solutions. |
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 ±0.5%, SO-8 package, 100mA max sink current | Limited thermal performance in high-power SOT89-replacement use cases | Select when tighter reference tolerance is required and power dissipation remains below 400mW |
| KA431AZTA | 2.5V ±2.2%, TO-92 package, 100mA sink current, higher tempco (50ppm/°C) | Lower accuracy and thermal stability; unsuitable for precision feedback loops | Accept only for cost-driven, non-critical voltage clamp applications where ±2.2% tolerance is acceptable |
Compared with TL431BIDBZR and KA431AZTA, AP431YG-13 offers superior thermal handling (800mW vs. 600mW/350mW), higher sink current (200mA vs. 100mA/100mA), and better temperature stability (30ppm/°C vs. 34ppm/°C/50ppm/°C), making it optimal for compact, high-current regulation in space-constrained SOT89 layouts.
Availability
AP431YG-13 is available at Aetrix Electronics and suitable for AC/DC adapters, LED drivers, overvoltage protection circuits, and programmable voltage monitors requiring stable component supply across production lifecycles.
Supply support for AP431YG-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 high-reliability power management and signal integrity solutions for industrial, computing, and consumer markets.
The AP431/AP431A series was designed specifically for precision shunt regulation in cost-sensitive, thermally demanding power supply feedback paths-emphasizing accuracy, thermal robustness, and Zener replacement capability.
FAQ
What is the maximum cathode voltage the AP431YG-13 can regulate?
The AP431YG-13 supports cathode voltages up to +36V absolute maximum rating. In normal operation, its regulated output voltage is programmable from 2.495V to 36V using external resistors. Exceeding 36V risks permanent damage per Absolute Maximum Ratings table in DS31002 Rev. 21-2.
Can AP431YG-13 replace a standard Zener diode directly?
Yes-AP431YG-13 functions as a 3-terminal Zener replacement with superior characteristics: sharper knee, lower dynamic impedance (0.2Ω vs. typical Zener's >5Ω), and ±1% reference tolerance versus ±5% for most Zeners. Requires only two external resistors for voltage setting instead of fixed-voltage selection.
Why does AP431YG-13 use SOT89 instead of SOT23?
SOT89 provides 800mW power dissipation (vs. 400mW for SOT23), essential for applications drawing >100mA cathode current. Its exposed anode pad enhances thermal conduction to PCB copper, enabling reliable operation at 200mA sink current without derating in ambient temperatures up to +85°C.
Is AP431YG-13 RoHS and "Green" compliant?
Yes-AP431YG-13 uses lead-free plating and halogen/antimony-free molding compound per Diodes Incorporated's "Green" definition (<900ppm Br, <900ppm Cl, <1000ppm Sb). It meets EU RoHS Directive 2011/65/EU and is fully compliant with JEDEC JS709C requirements.
AP431YG-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
AP431YG-13 FAQ
1.How can I place an order for AP431YG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431YG-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 AP431YG-13 reliable?
The price and inventory of AP431YG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431YG-13 is usually 5 days.
3.What payment methods are accepted for AP431YG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431YG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431YG-13?
AP431YG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431YG-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 AP431YG-13?
For technical support, including AP431YG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431YG-13 requirements.
6.How does Aetrix verify that AP431YG-13 is sourced from the original manufacturer or authorized distributors?
All AP431YG-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 AP431YG-13 meets industry standards.
7.What is the process for return or replacement of AP431YG-13?
All AP431YG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP431YG-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 AP431YG-13 part is unused and in its original packaging.
Return procedure for AP431YG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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