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Diodes Incorporated AP431AWL-7
- Part No.:
- AP431AWL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431AWL-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC59
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
AP431AWL-7 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 2.495V ±0.5% reference voltage tolerance, 0.2Ω dynamic output impedance, and 200mA sink current capability. It operates over –20°C to +85°C and sets programmable output voltages from 2.495V to 36V using two external resistors-enabling high-accuracy voltage monitoring and regulation in offline AC/DC power supplies.
For engineers reviewing the AP431AWL-7 datasheet, AP431AWL-7 pinout, AP431AWL-7 application, or AP431AWL-7 equivalent, this device serves as a Zener diode replacement in feedback loops of isolated flyback converters, overvoltage protection circuits, and precision current sources where tight reference stability and low temperature drift are required.
Technical Context
The AP431AWL-7 implements an internal bandgap reference and transconductance amplifier driving an NPN output stage, delivering sharp turn-on characteristics and fast transient response. Its reference input current remains below 3.5µA at 25°C and deviates less than 1.2µA across full temperature range.
It achieves 30ppm/°C equivalent full-range temperature coefficient and maintains stable regulation down to 300μA cathode current. The device's low 0.2Ω dynamic output impedance ensures minimal output voltage variation under load step changes up to 15mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% - enables fixed-output or programmable regulation without trim potentiometers in cost-sensitive designs |
| Sink Current Capability | 200mA - supports direct drive of optocoupler LEDs or secondary-side error amplifiers in isolated SMPS |
| Dynamic Output Impedance | 0.2Ω - minimizes output voltage deviation during load transients in feedback networks |
| Min Cathode Current | 300μA - allows stable regulation even in ultra-low-power standby modes of AC/DC adapters |
| Temp Coefficient | 30ppm/°C - ensures ≤±12mV drift over –20°C to +85°C, critical for industrial-grade voltage monitors |
| Output Voltage Range | 2.495V to 36V - set via external resistor divider, enabling flexible design of overvoltage crowbar or undervoltage lockout |
| Operating Temperature | –20°C to +85°C - qualified for extended commercial applications including LED drivers and industrial power modules |
Pinout & Package
AP431AWL-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 node | Connects to primary-side feedback network or optocoupler anode; carries full regulated output current |
| Anode (Pin 2) | Reference return path | Ground reference for internal amplifier; must be tied to system ground or isolated return in flyback designs |
| REF (Pin 3) | Reference input | High-impedance node sensing divided output voltage; bias current <3.5µA avoids loading divider accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference voltage | 2.495V ±0.5% - eliminates need for post-production trimming in factory-set power supplies |
| Low dynamic output impedance | 0.2Ω - sustains regulation accuracy despite PCB trace inductance or capacitor ESR in feedback paths |
| Fast turn-on response | Sub-microsecond rise time - prevents overshoot during startup or line transients in regulated DC outputs |
| Programmable output voltage | 2.495V–36V via R1/R2 divider - enables single BOM part across multiple output voltage variants (e.g., 5V/12V/24V adapters) |
| Lead-free & halogen-free | SC59 package compliant with RoHS 2 and JEDEC J-STD-020 - meets global environmental compliance for industrial shipments |
Applications
| Offline AC/DC Adapter Feedback | Overvoltage Crowbar Protection |
|---|---|
Use Scenario: Regulating 5V/12V output in isolated flyback converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable reference to optocoupler LED, closing control loop with <±1% output tolerance. Use Value: Replaces discrete Zener + transistor combo, reducing component count by 2–3 parts while improving thermal stability over –20°C to +70°C ambient. |
Use Scenario: Triggering SCR-based crowbar when DC bus exceeds 33V in telecom power systems. IC Role / Device Role / Timing Role: Adjustable voltage monitor comparing bus voltage against 33V threshold via R1/R2 divider; drives gate of thyristor upon overvoltage. Use Value: Enables precise, temperature-stable trip point (±0.5% ref + 30ppm/°C drift) without calibration, preventing false triggering during thermal cycling. |
| LED Constant-Current Driver | Industrial Voltage Monitor |
Use Scenario: Setting accurate 350mA current for high-brightness LED strings in streetlight drivers. IC Role / Device Role / Timing Role: Shunt regulator configured as current source with sense resistor; sinks current proportional to VREF/RSENSE. Use Value: Delivers ±1% current accuracy over temperature-critical for lumen consistency-without active op-amp compensation circuitry. |
Use Scenario: Monitoring 24V PLC I/O rail for undervoltage lockout (UVLO) at 21.5V and overvoltage shutdown (OVSD) at 27.5V. IC Role / Device Role / Timing Role: Dual-threshold comparator built using two AP431AWL-7 units with independent resistor dividers on same rail. Use Value: Achieves dual-window detection with <±0.1V absolute threshold error, eliminating need for dedicated window comparator ICs and associated BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.5V ±0.5% reference, 100mA max sink, SO-8 package, higher 0.3Ω output impedance | Limited to lower-current feedback loops; SO-8 footprint incompatible with SC59 PCB layout | Select when board space permits larger package and design tolerates 0.1Ω higher output impedance |
| AS431ATZTR-G1 | 2.495V ±0.5%, 100mA sink, SOT-23 package, 0.25Ω output impedance, not recommended for new designs | Same electrical specs but obsolete status increases long-term supply risk and obsolescence management overhead | Prefer AP431AWL-7 for new designs requiring guaranteed 10+ year availability and RoHS/halogen-free compliance |
Compared with TL431ACDBVR and AS431ATZTR-G1, AP431AWL-7 delivers identical reference accuracy and lower output impedance in a smaller SC59 package, while offering active production status and full environmental compliance-making it optimal for cost-sensitive, high-volume industrial power designs requiring long-term sourcing stability.
Availability
AP431AWL-7 is available at Aetrix Electronics and suitable for offline AC/DC adapters, industrial voltage monitors, LED constant-current drivers, and overvoltage protection circuits requiring stable component supply across multi-year production cycles.
Supply support for AP431AWL-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with emphasis on power management, signal integrity, and protection solutions for industrial and consumer markets.
AP431AWL-7 belongs to Diodes' precision shunt regulator product line, designed specifically for high-accuracy voltage reference and feedback applications in cost-constrained, thermally demanding power conversion systems.
FAQ
What is the minimum cathode current required for regulation in AP431AWL-7?
The AP431AWL-7 requires a minimum cathode current of 300μA to maintain regulation, verified per DS31002 Rev. 21–2 Section 6.2. This low threshold enables stable operation in standby or light-load conditions of switch-mode power supplies, where feedback current may drop below 1mA without compromising reference accuracy.
Can AP431AWL-7 replace a standard Zener diode in existing designs?
Yes-AP431AWL-7 directly replaces Zener diodes in voltage reference and regulation roles, offering superior 0.5% initial tolerance, 30ppm/°C temperature coefficient, and sharp turn-on characteristics. Unlike Zeners, it requires only two external resistors for programmability and draws <3.5µA reference current, minimizing divider loading errors.
What is the maximum power dissipation for AP431AWL-7 in SC59 package?
The AP431AWL-7 in SC59 package has a maximum power dissipation of 400mW at +25°C ambient, per Absolute Maximum Ratings Table in DS31002. Derating is required above +25°C at 4.0mW/°C, limiting usable power to ~280mW at +55°C ambient in typical PCB layouts without copper pour enhancement.
Is AP431AWL-7 suitable for automotive applications?
No-AP431AWL-7 is specified for extended commercial temperature range (–20°C to +85°C) and is not AEC-Q200 qualified. For automotive use, Diodes Incorporated offers the AP431Q series (AEC-Q200 Grade 2, –40°C to +105°C), which shares identical electrical specs but undergoes automotive-grade qualification testing.
AP431AWL-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:
- ±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:
- SC-59-3
AP431AWL-7 FAQ
1.How can I place an order for AP431AWL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431AWL-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 AP431AWL-7 reliable?
The price and inventory of AP431AWL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431AWL-7 is usually 5 days.
3.What payment methods are accepted for AP431AWL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431AWL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431AWL-7?
AP431AWL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431AWL-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 AP431AWL-7?
For technical support, including AP431AWL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431AWL-7 requirements.
6.How does Aetrix verify that AP431AWL-7 is sourced from the original manufacturer or authorized distributors?
All AP431AWL-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 AP431AWL-7 meets industry standards.
7.What is the process for return or replacement of AP431AWL-7?
All AP431AWL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431AWL-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 AP431AWL-7 part is unused and in its original packaging.
Return procedure for AP431AWL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431AWL-7 Tags
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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