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Diodes Incorporated AP431WL-7
- Part No.:
- AP431WL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431WL-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC59
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
AP431WL-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 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 AP431WL-7 datasheet, AP431WL-7 pinout, AP431WL-7 application, or AP431WL-7 equivalent, this device is selected for precision voltage monitoring, overvoltage protection, and constant-current sink designs where temperature-stable reference performance and low-output-impedance regulation are required.
Technical Context
The AP431WL-7 implements an internal bandgap reference and high-gain error amplifier driving an NPN pass transistor, enabling precise cathode-to-reference voltage regulation. Its active output stage ensures fast turn-on (sub-microsecond pulse response) and stable operation with capacitive loads up to 10µF under defined R1/R2 bias conditions.
It features programmable output voltage via external resistive divider, with reference input current as low as 1.4µA typical and minimum cathode current for regulation at 0.19mA. Temperature coefficient is specified at 30ppm/°C over –20°C to +85°C, supporting stable operation in industrial power supplies.
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 boost |
| Dynamic Output Impedance | 0.2Ω - ensures minimal output voltage deviation under load transients |
| Min Cathode Current | 0.19mA - enables regulation at ultra-low bias currents, reducing standby power |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV drift across full operating temperature range |
| Operating Temp Range | –20°C to +85°C - validated for extended commercial industrial environments |
| Output Voltage Range | 2.495V to 36V - configurable via two external resistors, no internal trimming needed |
Pinout & Package
AP431WL-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 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Regulated output node | Connects to supply rail being monitored; sinks current to maintain VREF at REF pin |
| REF (Pin 2) | Reference input | High-impedance (1.4µA typ) node tied to voltage divider midpoint; sets regulation threshold |
| Anode (Pin 3) | Ground return path | Completes current path; must be low-impedance connection to system ground |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference tolerance | ±1% at 25°C - eliminates need for post-assembly calibration or trim potentiometers |
| Low dynamic output impedance | 0.2Ω - maintains tight regulation during rapid load steps in SMPS feedback paths |
| Fast turn-on response | Sub-microsecond rise time - enables reliable crowbar and overvoltage latch detection |
| Programmable output voltage | 2.495V–36V - single device replaces multiple fixed Zener diodes across product families |
| Lead-free & halogen-free | SC59 package meets RoHS 2 and JEDEC J-STD-609 Class 1a standards |
Applications
| AC/DC Adapter Feedback | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters. IC Role / Device Role / Timing Role: Shunt regulator providing error signal to optocoupler input, closing voltage control loop. Use Value: ±1% reference tolerance ensures ±2% output voltage accuracy across line/load/temperature without secondary-side controller IC. |
Use Scenario: Monitoring DC bus voltage in motor drives or battery chargers. IC Role / Device Role / Timing Role: Precision threshold detector triggering SCR-based crowbar or shutdown logic. Use Value: 30ppm/°C tempco and 0.19mA min cathode current enable reliable trip point stability over –20°C to +85°C ambient. |
| Constant-Current LED Driver | Programmable Voltage Monitor |
|
Use Scenario: Low-cost, high-efficiency current sink for indicator or status LEDs. IC Role / Device Role / Timing Role: Regulated shunt element setting LED current via sense resistor (ILED = VREF/Rsense). Use Value: 200mA sink capability and 0.2Ω output impedance ensure <1% current variation across LED forward voltage spread. |
Use Scenario: Dual-threshold monitoring of microcontroller supply rails (e.g., 3.3V ±5%). IC Role / Device Role / Timing Role: Configured as window comparator using two AP431WL-7 units and discrete logic. Use Value: Independent upper/lower trip points set by resistor dividers; 1.4µA REF current minimizes monitoring circuit power overhead. |
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% reference tolerance, SO-8 package, higher 100mA max cathode current | Requires larger PCB area; lower reference current (1.5µA) but tighter initial accuracy | Preferred when ±0.5% absolute accuracy is mandatory and SO-8 footprint is acceptable |
| AS431ATZ33 | Same 2.495V ±1% spec, SOT-23 package, 100mA sink rating, 0.3Ω output impedance | Lower power handling; not rated for >100mA continuous sink; smaller thermal mass | Select when board space is constrained and load current remains below 100mA |
Compared with TL431BIDBZR and AS431ATZ33, the AP431WL-7 offers superior thermal performance in SC59 (800mW derated power vs. 400mW for SOT-23), higher 200mA sink capacity for robust crowbar operation, and identical reference accuracy-making it optimal for industrial power supplies requiring sustained current delivery and stable temperature behavior.
Availability
AP431WL-7 is available at Aetrix Electronics and suitable for AC/DC adapters, overvoltage protection circuits, and constant-current LED drivers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP431WL-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 high-reliability power management, signal integrity, and protection solutions for industrial and consumer markets.
The AP431/AP431A series was designed specifically for precision voltage regulation in cost-sensitive power supply feedback paths, offering Zener replacement functionality with improved temperature stability, lower output impedance, and programmable output capability.
FAQ
What is the maximum cathode voltage the AP431WL-7 can regulate?
The AP431WL-7 supports cathode-to-anode voltages up to +36V continuously, as specified in its Absolute Maximum Ratings. This allows direct use in 24V and 36V industrial systems without external clamping, provided power dissipation remains within the SC59 package's 400mW limit at ambient temperature.
Can AP431WL-7 replace a standard Zener diode in existing designs?
Yes-AP431WL-7 directly replaces Zener diodes in shunt regulator configurations. Its three-terminal architecture requires only two external resistors to set output voltage, while delivering sharper knee characteristics, lower dynamic impedance (0.2Ω vs. typical Zener's 5–20Ω), and guaranteed ±1% reference accuracy over temperature.
Is AP431WL-7 suitable for crowbar circuit applications?
Yes-its fast turn-on response (<1µs), 200mA sink capability, and stable regulation down to 0.19mA cathode current make it well-suited for crowbar circuits. When paired with an SCR, it reliably triggers overvoltage shutdown before downstream components exceed safe stress limits.
Does AP431WL-7 require a minimum load current to maintain regulation?
Yes-the device requires a minimum cathode current of 0.19mA (typical) to sustain regulation. This is satisfied by the current through the external resistor divider network; design must ensure divider current exceeds this value across all operating conditions, including lowest input voltage and highest temperature.
AP431WL-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
AP431WL-7 FAQ
1.How can I place an order for AP431WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431WL-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 AP431WL-7 reliable?
The price and inventory of AP431WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431WL-7 is usually 5 days.
3.What payment methods are accepted for AP431WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431WL-7?
AP431WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431WL-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 AP431WL-7?
For technical support, including AP431WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431WL-7 requirements.
6.How does Aetrix verify that AP431WL-7 is sourced from the original manufacturer or authorized distributors?
All AP431WL-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 AP431WL-7 meets industry standards.
7.What is the process for return or replacement of AP431WL-7?
All AP431WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431WL-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 AP431WL-7 part is unused and in its original packaging.
Return procedure for AP431WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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