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Diodes Incorporated AP431AG-13
- Part No.:
- AP431AG-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP431AG-13.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
AP431AG-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 DC/DC converters.
For engineers reviewing the AP431AG-13 datasheet, AP431AG-13 pinout, AP431AG-13 application, or AP431AG-13 equivalent, this device is selected for stable voltage reference, overvoltage protection, and current limiting circuits where temperature stability (30ppm/°C), low reference current (1.4–3.5µA), and tight initial tolerance are critical.
Technical Context
The AP431AG-13 implements an internal bandgap reference and high-gain transconductance amplifier driving an NPN output stage, enabling precise regulation through external R1/R2 feedback. Its active output circuitry ensures fast turn-on and low dynamic impedance across cathode currents from 0.19mA to 250mA.
It functions as a programmable shunt element: cathode voltage is regulated by comparing REF terminal voltage to internal 2.495V reference, then sinking current through the cathode to maintain VOUT = VREF(1 + R1/R2). Minimum cathode current for regulation is 0.19mA, and off-state leakage is ≤1.0µA at 36V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.495V ±1% - sets minimum programmable output voltage and defines accuracy baseline for feedback networks |
| Sink Current | 200mA max - supports high-current shunt regulation without external pass transistor |
| Dynamic 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, critical for industrial power supplies |
| IK(A-MIN) | 0.19mA - lowest cathode current sustaining regulation, enabling ultra-low-power standby modes |
| IREF | 1.4–3.5µA - ultra-low reference input current reduces divider power loss and improves efficiency |
| VK(A-MAX) | +36V - allows direct use in 24V and 32V bus applications without pre-regulation |
Pinout & Package
AP431AG-13 is packaged in SO-8 (lead-free, RoHS-compliant, "Green" molding compound). Pin assignments are standardized per Diodes Incorporated datasheet DS31002 Rev. 21-2: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Anode, Pin 4 = REF, Pin 5 = Anode, Pin 6 = Anode, Pin 7 = Anode, Pin 8 = Anode. Pins 2, 3, 5, 6, 7, and 8 are internally connected to Anode for thermal and current-handling enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (C) | Main current-sinking terminal; connects to regulated output node and feedback divider top |
| Pins 2,3,5,6,7,8 | Anode (A) | Common return path; multiple pins reduce thermal resistance and enable 200mA continuous operation |
| Pin 4 | Reference (R) | High-impedance sense input; connects to voltage divider midpoint for precise feedback control |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 2.495V ±1% enables fixed-output or programmable regulation without trimming potentiometers |
| Low dynamic output impedance | 0.2Ω maintains output stability during rapid load changes in SMPS feedback paths |
| Fully lead-free & halogen-free | RoHS 2 compliant with <900ppm Br/Cl and <1000ppm Sb - meets automotive and industrial environmental mandates |
| Sharp turn-on response | Fast activation eliminates overshoot in overvoltage crowbar and delay timer circuits |
| Wide operating temperature | −20°C to +85°C range supports deployment in industrial power supplies and telecom equipment |
Applications
| AC/DC Adapter Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating 5V/12V outputs in offline flyback converters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision shunt reference providing error signal to optocoupler LED driver. Use Value: ±1% VREF and 30ppm/°C TC ensure ±2% total output tolerance across line/load/temperature without calibration. |
Use Scenario: Triggering SCR-based crowbar when input rail exceeds safe threshold (e.g., 28V in 24V system). IC Role / Device Role / Timing Role: Adjustable voltage comparator with hysteresis via external resistors. Use Value: Programmable trip point up to 36V and 0.19mA IK(A-MIN) enable low-power, always-on monitoring. |
| Constant-Current Sink | Delay Timer Circuit |
Use Scenario: Biasing LED strings or charging capacitors with stable current independent of supply variation. IC Role / Device Role / Timing Role: Shunt regulator configured as two-terminal current source using single resistor. Use Value: 200mA sink capacity and 0.2Ω impedance deliver <±3% current accuracy across 5–30V input range. |
Use Scenario: Generating fixed time delays (e.g., 100ms–5s) in power sequencing or fault recovery logic. IC Role / Device Role / Timing Role: Voltage comparator with RC timing network on REF pin. Use Value: Ultra-low 1.4–3.5µA reference current minimizes RC discharge error and extends timing range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDR | 2.495V ±0.5%, higher 100mA sink rating, SO-8 package, 0.22Ω impedance | Lower reference tolerance but reduced thermal derating above 70°C; requires larger heatsinking at full load | Select when tighter initial accuracy is prioritized over maximum current capability |
| AS431ATZ | 2.495V ±0.5%, 100mA sink, SOT-23 package, 0.3Ω impedance, not recommended for new design | Smaller footprint but limited power dissipation (400mW); unsuitable for >150mA continuous operation | Select only for space-constrained legacy designs where thermal margin is adequate |
Compared with AP431AG-13, TL431BIDR offers superior initial accuracy but lower thermal robustness in SO-8, while AS431ATZ sacrifices current capacity and long-term availability for size reduction-making AP431AG-13 optimal for industrial 200mA shunt regulation with RoHS/Green compliance.
Availability
AP431AG-13 is available at Aetrix Electronics and suitable for AC/DC adapters, overvoltage protection circuits, and constant-current LED drivers requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for AP431AG-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 and consumer markets.
The AP431 series belongs to Diodes' precision voltage reference product line, designed specifically for cost-sensitive, high-volume power supply feedback and protection applications demanding accuracy, stability, and regulatory compliance.
FAQ
What is the minimum cathode current required for regulation in AP431AG-13?
The AP431AG-13 requires a minimum cathode current of 0.19mA to maintain regulation, as specified in its Electrical Characteristics table. This low threshold enables reliable operation in high-impedance feedback networks and ultra-low-power standby circuits where current budgets are constrained below 1mA.
Can AP431AG-13 replace a Zener diode directly in existing designs?
Yes-AP431AG-13 can directly replace Zener diodes in shunt regulator configurations. Its three-terminal architecture (Cathode, Anode, REF) requires adding two external resistors to set output voltage, but provides superior accuracy (±1% vs. ±5% typical for Zeners), lower dynamic impedance (0.2Ω vs. 5–50Ω), and sharper turn-on characteristics without sacrificing board space in SO-8.
Is AP431AG-13 suitable for automotive applications?
No-AP431AG-13 is rated for −20°C to +85°C operation and is not AEC-Q200 qualified. While it meets industrial temperature requirements, automotive applications requiring extended temperature range (−40°C to +125°C) or qualification should use Diodes' AEC-Q200-compliant alternatives such as the AZ431 series.
How does the SO-8 package of AP431AG-13 improve thermal performance over SOT-23 variants?
The SO-8 package provides six paralleled Anode pins and larger copper area, reducing thermal resistance to 110°C/W (vs. ~200°C/W for SOT-23), enabling full 200mA sink current at +85°C ambient without derating. This makes AP431AG-13 suitable for high-power density AC/DC adapters where SOT-23 versions would require significant current derating above 70°C.
AP431AG-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SO
AP431AG-13 FAQ
1.How can I place an order for AP431AG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431AG-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 AP431AG-13 reliable?
The price and inventory of AP431AG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431AG-13 is usually 5 days.
3.What payment methods are accepted for AP431AG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431AG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431AG-13?
AP431AG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431AG-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 AP431AG-13?
For technical support, including AP431AG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431AG-13 requirements.
6.How does Aetrix verify that AP431AG-13 is sourced from the original manufacturer or authorized distributors?
All AP431AG-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 AP431AG-13 meets industry standards.
7.What is the process for return or replacement of AP431AG-13?
All AP431AG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP431AG-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 AP431AG-13 part is unused and in its original packaging.
Return procedure for AP431AG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431AG-13 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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