My Inquiry
My Account
Diodes Incorporated AP431WG-7
- Part No.:
- AP431WG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431WG-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP431WG-7 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 replaces Zener diodes in feedback loops of AC/DC adapters, LED drivers, and voltage monitors where programmable regulation from 2.495V to 36V is required.
For engineers reviewing the AP431WG-7 datasheet, AP431WG-7 pinout, AP431WG-7 application, or AP431WG-7 equivalent, this device supports stable voltage reference design in isolated flyback converters, overvoltage protection circuits, and constant-current LED biasing-requiring precise cathode-to-reference voltage tracking, low temperature drift (30ppm/°C), and minimal minimum cathode current (300μA).
Technical Context
The AP431WG-7 implements an internal bandgap reference and high-gain transconductance amplifier driving an NPN output stage. Its active sink circuitry delivers sharp turn-on response and low 0.2Ω dynamic output impedance across 0.1–15mA cathode current variation.
It operates as a 2-terminal programmable shunt regulator when configured with external R1/R2 resistive divider, enabling output voltage setting via VOUT = VREF(1 + R1/R2). The reference input current remains stable at 1.4–3.5μA over −20°C to +85°C, supporting high-impedance feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.495V ±1% - sets absolute accuracy of regulated output voltage in feedback networks |
| Sink Current | 200mA max - supports high-power shunt regulation without external pass transistor |
| Dynamic Impedance | 0.2Ω typical - ensures tight output voltage stability under load transients |
| Temp Coefficient | 30ppm/°C - enables stable reference performance across industrial temperature range |
| Min Cathode Current | 300μA - allows operation with high-value feedback resistors, reducing power loss |
| Output Voltage Range | 2.495V to 36V - programmable via two external resistors for flexible system-level regulation |
| Operating Temp | −20°C to +85°C - qualified for commercial and industrial power supply environments |
Pinout & Package
AP431WG-7 is packaged in SC59 (SOT-23-3 compatible outline), a lead-free, RoHS-compliant surface-mount package with 1.6mm × 2.8mm footprint and 0.95mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current Sink Terminal | Connects to regulated node; carries full load current up to 200mA |
| Reference (Pin 2) | Feedback Input | High-impedance node sensing divided output voltage; draws only 1.4–3.5μA |
| Anode (Pin 3) | Ground Reference | Common return path for cathode current and reference bias; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 2.495V ±1% tolerance eliminates need for trim potentiometers in production |
| Low dynamic output impedance | 0.2Ω ensures <1mV output shift under 10mA load step, critical for ripple-sensitive supplies |
| Sharp turn-on response | Enables fast error correction in switching regulator feedback loops without phase compensation |
| Programmable output voltage | Supports 2.495V–36V regulation using standard resistor values, simplifying BOM management |
| Low reference input current | 1.4–3.5μA allows >1MΩ feedback dividers, minimizing standby power in energy-efficient designs |
Applications
| AC/DC Adapter Feedback | LED Constant-Current Driver |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters with optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5V reference to optocoupler LED anode, enabling accurate primary-side duty cycle control. Use Value: ±1% VREF and 30ppm/°C tempco ensure ±2% output voltage regulation across line/load/temperature without trimming. |
Use Scenario: High-efficiency constant-current bias for multi-string white LEDs in signage and backlighting. IC Role / Device Role / Timing Role: Shunt regulator configured as current sink, setting LED current via ILED = VREF/Rsense. Use Value: 200mA sink capacity and 0.2Ω impedance maintain ±1% current accuracy despite input voltage variation up to 36V. |
| Overvoltage Protection Circuit | Programmable Voltage Monitor |
|
Use Scenario: Crowbar or latch-off protection triggered when DC bus exceeds safe threshold (e.g., 24V rail). IC Role / Device Role / Timing Role: Adjustable shunt reference comparing divided bus voltage against VREF; drives SCR gate when threshold exceeded. Use Value: Programmable trip point (e.g., 25.5V via R1/R2) with <100μA quiescent current preserves system efficiency during normal operation. |
Use Scenario: Dual-threshold monitoring for battery charge status (e.g., low/high voltage alerts). IC Role / Device Role / Timing Role: Dual-resistor network configures AP431WG-7 as window comparator by feeding REF pin from two independent dividers. Use Value: Sharp turn-on and low input current enable clean logic-level transitions without hysteresis components or external comparators. |
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% VREF, 100ppm/°C tempco, SO-8 package | Higher accuracy but larger footprint and higher cost; requires PCB redesign | Choose for tighter regulation specs where board space permits SO-8 mounting |
| AS431ATZ | Same 2.495V ±1% spec, SC59 package, but rated for −40°C to +125°C | Extended temperature range suits automotive under-hood use; not drop-in due to different marking and date code format | Choose for extended-temp industrial or automotive applications requiring same footprint |
Compared with TL431BIDBZR and AS431ATZ, AP431WG-7 offers optimal balance of commercial-grade accuracy, SC59 compactness, and cost efficiency for AC/DC and LED driver designs operating within −20°C to +85°C.
Availability
AP431WG-7 is available at Aetrix Electronics and suitable for AC/DC adapters, LED lighting systems, and industrial voltage monitors requiring stable component supply with consistent parametric performance and long-term sourcing continuity.
Supply support for AP431WG-7 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 solutions for industrial, computing, and consumer markets.
AP431WG-7 belongs to Diodes' precision shunt regulator product line, designed specifically for cost-sensitive, space-constrained power supply feedback and voltage monitoring applications demanding high accuracy and thermal stability.
FAQ
What is the maximum cathode voltage rating for AP431WG-7?
The absolute maximum cathode voltage is +36V. Exceeding this value risks permanent damage to the internal reference and output transistor. In practice, continuous operation above 32V requires careful thermal derating due to power dissipation limits in the SC59 package (400mW at +25°C ambient).
Can AP431WG-7 replace a Zener diode directly in existing designs?
Yes, it can replace Zener diodes in shunt regulator configurations, but requires three connections (cathode, anode, reference) instead of two. The reference pin must be connected to a resistive divider tapping the regulated node; direct Zener substitution without adding the divider will not function.
Does AP431WG-7 require external capacitors for stability?
Stability depends on output capacitance and series resistance. Per Figure 8 in DS31002, oscillation may occur with >10μF load capacitance unless a series resistor ≥150Ω is added. For most applications with ≤1μF output caps, no external compensation is needed.
Is AP431WG-7 suitable for automotive applications?
No-AP431WG-7 is specified for −20°C to +85°C operation and is not AEC-Q200 qualified. For automotive use, Diodes' AS431ATZ (−40°C to +125°C, same SC59 package) is the designated alternative with extended temperature validation and automotive-grade screening.
AP431WG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SC-59-3
AP431WG-7 FAQ
1.How can I place an order for AP431WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431WG-7 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 AP431WG-7 reliable?
The price and inventory of AP431WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431WG-7 is usually 5 days.
3.What payment methods are accepted for AP431WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431WG-7?
AP431WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431WG-7 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 AP431WG-7?
For technical support, including AP431WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431WG-7 requirements.
6.How does Aetrix verify that AP431WG-7 is sourced from the original manufacturer or authorized distributors?
All AP431WG-7 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 AP431WG-7 meets industry standards.
7.What is the process for return or replacement of AP431WG-7?
All AP431WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431WG-7, 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 AP431WG-7 part is unused and in its original packaging.
Return procedure for AP431WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431WG-7 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
