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Diodes Incorporated AP432AYG-13
- Part No.:
- AP432AYG-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AP432AYG-13.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,775
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Product details
Overview
AP432AYG-13 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 1.24V ±0.5% reference voltage, 200mA sink current capability, and 0.2Ω dynamic output impedance, designed for voltage regulation, over/under-voltage protection, and current limiting in power supply feedback loops.
For engineers reviewing the AP432AYG-13 datasheet, AP432AYG-13 pinout, AP432AYG-13 application, or AP432AYG-13 equivalent, this device serves as a high-accuracy Zener replacement in SMPS feedback, battery management, and programmable voltage monitoring circuits where tight tolerance and low temperature drift are critical.
Technical Context
The AP432A uses an internal bandgap reference and active output stage to deliver sharp turn-on characteristics and stable regulation across –20°C to +85°C. Its 30 ppm/°C temperature coefficient ensures minimal VREF drift over temperature, enabling fixed or adjustable output configurations up to 20V via external resistor dividers.
It operates as a two-quadrant shunt regulator: cathode sinks current when VKA exceeds (1+R1/R2)×VREF, while maintaining low 150μA minimum cathode current for regulation. The 0.2Ω dynamic impedance supports fast transient response in closed-loop feedback systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24V ±0.5% - enables precise, drift-resistant voltage setting without trim potentiometers |
| Sink Current Capability | 200mA - supports direct regulation of medium-power feedback paths without external amplification |
| Dynamic Output Impedance | 0.2Ω - ensures stable loop gain and minimal output voltage deviation under load transients |
| Min Cathode Current | 150μA - allows reliable regulation even in ultra-low-power standby or biasing circuits |
| Temp Coefficient | 30 ppm/°C - guarantees ≤±3mV VREF shift over full –20°C to +85°C operating range |
| Output Voltage Range | 1.24V to 20V - programmable via external R1/R2 divider, supporting wide-range SMPS and LDO designs |
| Package | SOT89-3 - thermally robust 3-pin surface-mount package with 800mW power dissipation rating |
Pinout & Package
SOT89-3 package with exposed thermal pad (pin 2), optimized for power dissipation in compact DC-DC feedback applications. Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = REF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Ground reference terminal | Connected to system ground or return path; establishes common reference for feedback network |
| 2 (Cathode) | Current-sinking output | Sinks up to 200mA to regulate voltage at feedback node; requires thermal pad soldering for full power rating |
| 3 (REF) | Reference input | Connects to voltage divider midpoint; senses regulated output and triggers conduction when threshold exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference tolerance | ±0.5% (AP432A grade) - eliminates need for post-production trimming in cost-sensitive power supplies |
| Low dynamic output impedance | 0.2Ω - maintains tight regulation during rapid load steps in switch-mode converters |
| Fast turn-on response | Sharp knee conduction - reduces overshoot in overvoltage crowbar and protection circuits |
| Programmable output range | 1.24V–20V - supports single-part design across multiple output voltages using only passive resistors |
| Thermal performance | 800mW power dissipation (SOT89-3) - enables higher-current regulation than SOT23/SOT25 variants |
Applications
| SMPS Feedback Regulation | Battery Overvoltage Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt regulator providing precise reference to error amplifier; sets feedback threshold determining primary-side duty cycle. Use Value: ±0.5% VREF and 30 ppm/°C drift ensure <±1% output accuracy across temperature, reducing need for secondary-side calibration. |
Use Scenario: Monitoring lithium-ion cell voltage to disable charging above 4.3V. IC Role / Device Role / Timing Role: Adjustable shunt element triggering cutoff transistor when cell voltage exceeds programmed threshold. Use Value: Programmable trip point (e.g., 4.3V = 1.24V × (1 + R1/R2)) with <0.5% initial error enables accurate end-of-charge detection. |
| Constant-Current Sink | Voltage Monitor with Hysteresis |
|
Use Scenario: Providing stable bias current for LED drivers or sensor excitation circuits. IC Role / Device Role / Timing Role: Precision current source formed by connecting REF to cathode through sense resistor (IOUT = VREF / RCL). Use Value: 0.2Ω output impedance and ±0.5% VREF yield <1% current accuracy over temperature and line variations. |
Use Scenario: Detecting brown-out or overvoltage conditions in microcontroller power rails. IC Role / Device Role / Timing Role: Dual-threshold comparator built using two resistor networks feeding REF pin to set upper/lower limits. Use Value: Independent high/low trip points (e.g., 4.7V/4.2V) with <10mV hysteresis prevent chatter during slow-ramping supply transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AZ431L | 1.24V ±0.5%, 100mA sink, 0.35Ω impedance, SOT23/SOT25 | Lower current rating and higher impedance limit use in >100mA feedback or fast-transient designs | Select AZ431L only for space-constrained, lower-power applications where thermal margin is sufficient |
| TL431BIDBZR | 2.495V ±0.5%, 100mA sink, 0.22Ω impedance, SOT23 | Fixed 2.495V reference requires different resistor scaling; not drop-in compatible for 1.24V-based designs | Choose TL431B only when redesigning feedback network around 2.5V reference and accepting higher minimum output voltage |
Compared with AZ431L and TL431BIDBZR, AP432AYG-13 offers higher sink current (200mA vs. 100mA) and superior thermal capability in SOT89-3, making it optimal for higher-power SMPS feedback where stability under load transients and thermal reliability are prioritized.
Availability
AP432AYG-13 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, battery protection circuitry, and precision current source applications requiring stable component supply and long-term manufacturability.
Supply support for AP432AYG-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, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP432A belongs to Diodes' precision shunt regulator product line, engineered specifically for high-accuracy voltage reference and regulation in cost-sensitive, thermally demanding power conversion systems.
FAQ
What is the maximum output voltage achievable with AP432AYG-13?
The AP432AYG-13 supports programmable output voltages from 1.24V up to 20V using external resistors R1 and R2 in a voltage divider configuration. This upper limit is defined by the absolute maximum cathode voltage rating of 20V and applies across the full operating temperature range of –20°C to +85°C.
Can AP432AYG-13 replace a standard Zener diode directly?
Yes - AP432AYG-13 functions as a 3-terminal active Zener replacement with superior performance: ±0.5% reference accuracy versus typical ±5% Zener tolerance, 0.2Ω dynamic impedance versus 10–100Ω Zener impedance, and sharp turn-on characteristics that eliminate soft knee issues in regulation and protection circuits.
Is thermal pad connection required for AP432AYG-13 in SOT89-3?
Yes - the SOT89-3 package features an exposed thermal pad on pin 2 (Cathode). To achieve the rated 800mW power dissipation and maintain junction temperature within limits, the pad must be soldered to a copper pour or thermal land per the recommended PCB layout in DS31003 Rev. 19.
Why is AP432/AP432A marked "NOT RECOMMENDED FOR NEW DESIGN"?
This designation reflects Diodes Incorporated's product lifecycle guidance: while AP432A remains fully manufactured and supported, new designs are encouraged to evaluate AZ431L - a functionally equivalent, pin-compatible successor with identical electrical specs and enhanced process consistency, offering longer-term supply assurance.
AP432AYG-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):
- 1.24V
- Voltage - Output (Max):
- 20 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:
- 300 µA
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP432AYG-13 FAQ
1.How can I place an order for AP432AYG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP432AYG-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 AP432AYG-13 reliable?
The price and inventory of AP432AYG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP432AYG-13 is usually 5 days.
3.What payment methods are accepted for AP432AYG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP432AYG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP432AYG-13?
AP432AYG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP432AYG-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 AP432AYG-13?
For technical support, including AP432AYG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP432AYG-13 requirements.
6.How does Aetrix verify that AP432AYG-13 is sourced from the original manufacturer or authorized distributors?
All AP432AYG-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 AP432AYG-13 meets industry standards.
7.What is the process for return or replacement of AP432AYG-13?
All AP432AYG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP432AYG-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 AP432AYG-13 part is unused and in its original packaging.
Return procedure for AP432AYG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP432AYG-13 Tags
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