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Diodes Incorporated AP431ASRG-7
- Part No.:
- AP431ASRG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431ASRG-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23R
- Quantity:
- Payment:
- Shipping:
Inventory:4,936
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Product details
Overview
AP431ASRG-7 from Diodes Incorporated is an adjustable precision shunt regulator with 2.495V ±0.5% reference voltage, 200mA sink current capability, and 0.2Ω dynamic output impedance. It operates from 2.495V to 36V output via external resistor divider, features 30ppm/°C tempco, and replaces Zener diodes in feedback loops of AC-DC adapters and LED drivers.
For engineers reviewing the AP431ASRG-7 datasheet, AP431ASRG-7 pinout, AP431ASRG-7 application, or AP431ASRG-7 equivalent, this page delivers verified electrical specs, SOT23R package details, thermal stability data, and real-world use cases for voltage monitoring, current limiting, and overvoltage protection circuits.
Technical Context
The AP431ASRG-7 implements a bandgap-based reference core with active cathode output stage, enabling sharp turn-on and low dynamic impedance. Its internal architecture supports stable regulation down to 300μA minimum cathode current and maintains ±0.5% reference accuracy across –20°C to +85°C.
It functions as a 3-terminal programmable shunt: cathode sinks current when REF voltage exceeds 2.495V, with anode tied to ground or low-impedance return path. The device's 1.4–3.5μA reference input current and <1.0μA off-state leakage ensure minimal power loss in standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% - enables precise, drift-free voltage setting without trim potentiometers |
| Sink Current Capacity | 200mA - supports direct regulation of medium-power feedback networks and error amplifiers |
| Dynamic Output Impedance | 0.2Ω - ensures tight output voltage regulation under fast load transients |
| Temp Coefficient | 30ppm/°C - guarantees ≤±8mV total reference drift over full operating temperature range |
| Min Cathode Current | 300μA - allows stable operation in ultra-low-power biasing and sensing applications |
| Output Voltage Range | 2.495V to 36V - programmable via two-resistor divider, compatible with wide-input SMPS designs |
| Off-State Leakage | ≤1.0μA at 36V - minimizes quiescent current in shutdown or fault conditions |
Pinout & Package
SOT23R package: 3-pin surface-mount, RoHS-compliant, halogen-free, 1.3mm × 2.9mm footprint with 0.95mm height and 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current Sink Terminal | Primary output node; sinks up to 200mA to maintain regulated voltage at REF |
| Anode (Pin 2) | Ground Reference | Return path for internal reference and output stage; must be low-impedance to system ground |
| REF (Pin 3) | Voltage Sense Input | High-impedance (≤3.5μA) input that triggers regulation when voltage exceeds 2.495V |
Key Features
| Feature | Design Value |
|---|---|
| Precision reference tolerance | ±0.5% - eliminates need for post-production trimming in cost-sensitive power supplies |
| Low dynamic output impedance | 0.2Ω - sustains regulation during rapid load steps without external compensation |
| Fast turn-on response | Sub-microsecond rise time - enables accurate pulse-width detection in crowbar and delay timer circuits |
| Programmable output range | 2.495V–36V - supports single-part design across multiple output voltages in adapter families |
| Lead-free & green packaging | SOT23R with <900ppm Br/Cl, <1000ppm Sb - meets global environmental compliance without performance trade-offs |
Applications
| AC-DC Adapter Feedback | LED Constant-Current Driver |
|---|---|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters powering consumer electronics. IC Role / Device Role / Timing Role: Shunt regulator providing optocoupler bias and error signal to primary controller via TL431-compatible interface. Use Value: ±0.5% reference accuracy ensures ±1.5% output voltage tolerance across line/load/temperature, meeting USB PD and ENERGY STAR requirements. | Use Scenario: High-efficiency constant-current sink for multi-string LED lighting modules. IC Role / Device Role / Timing Role: Precision current reference driving MOSFET gate through op-amp feedback loop. Use Value: 30ppm/°C tempco and 0.2Ω output impedance maintain ±2% current stability over –20°C to +70°C ambient. |
| Voltage Monitor Circuit | Overvoltage Protection (OVP) |
Use Scenario: Dual-threshold detection for brown-in/brown-out in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Comparator-mode operation using internal reference to trigger logic-level alerts at preset thresholds. Use Value: 1.4–3.5μA REF input current enables high-impedance resistor dividers, reducing standby power to <10μW. | Use Scenario: Crowbar-triggered shutdown in telecom DC-DC front-ends exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting shunt element that shorts input rail when sensed voltage exceeds safe limit. Use Value: Sub-μs turn-on response and 200mA sink capacity reliably fire SCRs or thyristors before downstream ICs sustain damage. |
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 | ±0.5% reference, SO-8 package, higher 0.35Ω output impedance | Requires larger PCB area; less suitable for space-constrained SMT layouts | Preferred where legacy SO-8 footprint compatibility is required |
| KA431AZTA | ±2% reference tolerance, SOT-23 package, 0.3Ω output impedance | Lower accuracy limits use in precision feedback; acceptable for cost-driven consumer adapters | Select only when ±2% output tolerance is acceptable and BOM cost is primary constraint |
Compared with TL431ACDBVR and KA431AZTA, the AP431ASRG-7 delivers tighter reference accuracy and lower output impedance in the compact SOT23R package-making it optimal for next-generation compact AC-DC adapters and LED drivers where size, precision, and thermal stability are critical.
Availability
AP431ASRG-7 is available at Aetrix Electronics and suitable for AC-DC adapter feedback, LED constant-current driver, and overvoltage protection circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP431ASRG-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 design centers in Asia, Europe, and the US.
The AP431 series belongs to Diodes' precision reference product line, engineered for high-accuracy voltage regulation in power management systems where reliability, thermal stability, and small-footprint packaging are essential.
FAQ
What is the maximum cathode voltage rating for AP431ASRG-7?
The absolute maximum cathode voltage is +36V. Exceeding this value risks permanent damage to the internal reference circuitry and output transistor. Operation above 36V requires external clamping or zener protection, as confirmed in DS31002 Rev. 21–2 Section "Absolute Maximum Ratings".
Can AP431ASRG-7 replace TL431 in existing designs?
Yes-AP431ASRG-7 is pin-compatible with TL431 in SOT23R footprint and shares identical electrical behavior: same 3-terminal topology, 2.495V reference, and cathode-sink operation. However, its ±0.5% tolerance and 30ppm/°C tempco exceed standard TL431 (±1%, 50ppm/°C), enabling drop-in upgrades in precision applications.
What is the minimum cathode current needed for regulation?
The minimum cathode current for stable regulation is 300μA, verified across –20°C to +85°C per Electrical Characteristics table (IKA(MIN) = 0.19–0.50mA typical). Below this threshold, the device may enter unregulated state with increased output impedance and reference drift.
Does AP431ASRG-7 require external compensation for stability?
No external compensation is required for basic shunt regulation. Stability boundary curves in DS31002 show stable operation with CL ≤ 100nF and R2 ≥ 1kΩ. For delay timers or comparator-mode use, consult AN78 for RC network guidelines to avoid oscillation in high-gain configurations.
AP431ASRG-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:
- SOT23R
AP431ASRG-7 FAQ
1.How can I place an order for AP431ASRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431ASRG-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 AP431ASRG-7 reliable?
The price and inventory of AP431ASRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431ASRG-7 is usually 5 days.
3.What payment methods are accepted for AP431ASRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431ASRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431ASRG-7?
AP431ASRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431ASRG-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 AP431ASRG-7?
For technical support, including AP431ASRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431ASRG-7 requirements.
6.How does Aetrix verify that AP431ASRG-7 is sourced from the original manufacturer or authorized distributors?
All AP431ASRG-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 AP431ASRG-7 meets industry standards.
7.What is the process for return or replacement of AP431ASRG-7?
All AP431ASRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP431ASRG-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 AP431ASRG-7 part is unused and in its original packaging.
Return procedure for AP431ASRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431ASRG-7 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
Diodes Incorporated
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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