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Diodes Incorporated AP431IANTR-G1
- Part No.:
- AP431IANTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP431IANTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,758
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Product details
Overview
AP431IANTR-G1 from Diodes Incorporated is a 3-terminal adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (2.500 V at +25°C), 50 µA typical minimum cathode current for regulation, and operation up to 36 V cathode voltage. It replaces Zener diodes in feedback loops of switching power supplies, battery chargers, and voltage adapters where low-power, high-stability regulation is required.
For engineers reviewing the AP431IANTR-G1 datasheet, AP431IANTR-G1 pinout, AP431IANTR-G1 application, or AP431IANTR-G1 equivalent, key selection criteria include its ultra-low IK(A,min), tight VREF tolerance across -40°C to +125°C, low dynamic impedance (0.1 Ω), and SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The AP431IANTR-G1 implements a bandgap-referenced error amplifier driving an NPN output stage, enabling precise two-resistor programmable output voltage from 2.5 V to 36 V. Its internal architecture delivers sharp turn-on characteristics and stable regulation even under capacitive loads up to 100 µF.
It operates over full industrial temperature range (-40°C to +125°C) with only 11 mV typical deviation in VREF, and maintains sink current capability from 100 µA to 100 mA while exhibiting <0.3 Ω dynamic impedance and <0.5 µA reference input current - critical for high-efficiency, low-quiescent designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (Initial Tolerance) | 2.500 V ±0.5% at +25°C - enables accurate 5 V, 12 V, or custom output setting with minimal resistor trimming |
| IK(A,min) | 50 µA typical - allows regulation in ultra-low-power bias networks and energy-harvesting circuits |
| ZKA (Dynamic Impedance) | 0.1 Ω typical - ensures stable feedback loop response and minimal output voltage ripple under load transients |
| VKA(max) | 36 V - supports wide-input DC-DC converters including 24 V industrial and 32 V automotive auxiliary rails |
| TA Range | -40°C to +125°C - qualified for under-hood, industrial control, and graphics card VRM applications |
| Package | SOT-23 (N code) - surface-mount footprint compatible with automated assembly and thermal relief pad design |
| RoHS/Green | Fully lead-free, halogen- and antimony-free - meets IPC-1752A Class 3 material declarations |
Pinout & Package
SOT-23 package (code N) with gull-wing leads; compact 2.9 mm × 1.3 mm footprint; JEDEC MO-178 compliant; thermal resistance θJC = 140°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node connected to voltage divider midpoint; draws only 0.2–0.5 µA - minimizes divider current error |
| 2 (ANODE) | Anode Terminal | Connected to system ground or return path; forms current sink path with cathode; requires low-inductance grounding |
| 3 (CATHODE) | Cathode Terminal | Output node tied to primary-side feedback of isolated flyback or secondary-side error amplifier; sinks up to 100 mA |
Key Features
| Feature | Design Value |
|---|---|
| Low IK(A,min) | 50 µA typical enables regulation in standby modes where total system current is <100 µA |
| Programmable VOUT | Set from 2.5 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage references |
| Thermal Stability | 11 mV VREF drift over -40°C to +125°C - reduces calibration burden in wide-temperature deployments |
| Capacitive Load Stability | Stable with ≥100 µF output capacitance - simplifies EMI filter design without external compensation |
| Dynamic Impedance | 0.1 Ω typical - maintains <1 mV output perturbation during 10 mA load steps at 100 kHz |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Regulation |
|---|---|
Use Scenario: Primary-side feedback in isolated flyback converters for AC/DC adapters and USB PD power bricks. IC Role / Device Role / Timing Role: Shunt regulator providing precise error signal to optocoupler input, closing the isolation barrier control loop. Use Value: 0.5% VREF tolerance ensures ±1% output voltage accuracy across line/load/temperature - meeting CoC Tier 2 and DoE Level VI requirements. |
Use Scenario: Constant-voltage stage in Li-ion/LiPo battery charging circuits for portable electronics and power tools. IC Role / Device Role / Timing Role: Precision voltage reference in linear or buck-based CV loop, interfacing with charge management IC or microcontroller ADC. Use Value: 50 µA IK(A,min) allows regulation during trickle-charge and sleep states without compromising battery shelf life. |
| Voltage Adapter Reference | Graphics Card VRM Monitoring |
Use Scenario: Output voltage setting and monitoring in DC-DC step-down modules converting 12 V or 19 V to 5 V/3.3 V for embedded systems. IC Role / Device Role / Timing Role: Adjustable shunt reference used in external feedback network of synchronous buck controllers (e.g., MP2315, RT7290). Use Value: Low 0.1 Ω ZKA prevents gain error in feedback path - maintaining tight regulation (<±15 mV) under dynamic GPU load transients. |
Use Scenario: Real-time rail monitoring and overvoltage protection in discrete GPU power delivery networks. IC Role / Device Role / Timing Role: High-stability reference feeding comparator inputs for +12 V, +1.05 V, or +0.8 V GPU core/memory rails. Use Value: -40°C to +125°C operation and 11 mV VREF drift ensure reliable fault detection across ambient and junction temperature extremes. |
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 | Higher IK(A,min) (100 µA typ), same VREF tolerance (0.5%), but no guaranteed 125°C operation | Limited to commercial temp range (0°C to 70°C); unsuitable for under-hood or industrial environments | Select when cost sensitivity outweighs extended temperature or ultra-low IK(A,min) needs |
| AS431ATBZTR-E1 | Same 0.5% VREF, 50 µA IK(A,min), but TO-92 only - no SOT-23 option | Through-hole assembly required; incompatible with high-density SMT layouts | Choose only for legacy through-hole designs or prototyping with breadboard-friendly packages |
Compared with TL431ACDBVR and AS431ATBZTR-E1, the AP431IANTR-G1 uniquely combines SOT-23 packaging, guaranteed -40°C to +125°C operation, and 50 µA regulation threshold - making it optimal for next-generation compact, thermally demanding, and low-power applications.
Availability
AP431IANTR-G1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger voltage regulation, and voltage adapter reference applications requiring stable component supply, RoHS-compliant sourcing, and long-term lifecycle support.
Supply support for AP431IANTR-G1 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, computing, and consumer markets.
The AP431i series belongs to Diodes' precision reference product line, engineered specifically for high-accuracy, low-power shunt regulation in feedback-critical power conversion systems - emphasizing thermal stability, low quiescent current, and robust capacitive-load immunity.
FAQ
What is the maximum cathode voltage the AP431IANTR-G1 can regulate?
The AP431IANTR-G1 supports cathode voltages up to 36 V under recommended operating conditions, with absolute maximum rating of 40 V. This allows direct use in 24 V industrial rails and 32 V automotive auxiliary systems without external clamping, provided power dissipation remains within SOT-23 limits (350 mW).
How does the 0.5% reference voltage tolerance impact output accuracy in a 5 V power supply?
With 0.5% VREF tolerance (±12.5 mV at 2.500 V), and assuming ideal resistors, the resulting 5 V output has ±1% accuracy before considering resistor tolerances and temperature drift. In practice, combined with 1% feedback resistors, total output error stays within ±1.5%, meeting most industrial and computing power spec requirements.
Can the AP431IANTR-G1 drive an optocoupler directly in a flyback converter?
Yes - its 100 mA sink capability exceeds typical optocoupler LED forward currents (5–20 mA). Combined with low dynamic impedance (0.1 Ω), it delivers clean, low-noise error signals across the isolation barrier, supporting stable loop bandwidth up to 50 kHz without external compensation.
Is the AP431IANTR-G1 pin-compatible with standard TL431 footprints?
No - although electrically similar, the AP431IANTR-G1 uses SOT-23 (3-pin, gull-wing) with REF-ANODE-CATHODE pinout, whereas common TL431 variants use TO-92 or SO-8 packages with different pin assignments. PCB layout must follow Diodes' SOT-23 pad dimensions (2.9 mm × 1.3 mm, 0.95 mm pitch).
AP431IANTR-G1 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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP431IANTR-G1 FAQ
1.How can I place an order for AP431IANTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP431IANTR-G1 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 AP431IANTR-G1 reliable?
The price and inventory of AP431IANTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP431IANTR-G1 is usually 5 days.
3.What payment methods are accepted for AP431IANTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP431IANTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP431IANTR-G1?
AP431IANTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP431IANTR-G1 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 AP431IANTR-G1?
For technical support, including AP431IANTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP431IANTR-G1 requirements.
6.How does Aetrix verify that AP431IANTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP431IANTR-G1 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 AP431IANTR-G1 meets industry standards.
7.What is the process for return or replacement of AP431IANTR-G1?
All AP431IANTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP431IANTR-G1, 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 AP431IANTR-G1 part is unused and in its original packaging.
Return procedure for AP431IANTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP431IANTR-G1 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
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