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Diodes Incorporated AN431AN-ATRE1
- Part No.:
- AN431AN-ATRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AN431AN-ATRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,530
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Product details
Overview
AN431AN-ATRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.5% reference voltage tolerance, 2.5V to 36V programmable output range, and low dynamic impedance (0.15Ω typical). It operates from –40°C to +125°C and replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references.
For engineers reviewing the AN431AN-ATRE1 datasheet, AN431AN-ATRE1 pinout, AN431AN-ATRE1 application, or AN431AN-ATRE1 equivalent, this device delivers stable two-resistor-programmable regulation with sharp turn-on, low temperature drift (±4.5mV over full range), and high capacitive load stability-critical for feedback loop integrity in isolated DC-DC converters and adaptive voltage rails.
Technical Context
The AN431AN-ATRE1 functions as a programmable 2.5V bandgap reference with internal error amplifier and NPN output stage, configured in shunt topology to sink cathode current (1–100mA) based on external resistor divider feedback. Its reference input (REF) senses voltage at the junction of R1/R2, enabling precise VOUT = VREF × (1 + R1/R2).
It features low output impedance (0.15Ω), minimal reference current (0.7µA typical), and negligible cathode voltage sensitivity (∆VREF/∆VKA ≤ –2.7mV/V), allowing stable operation across wide input voltage swings and varying load conditions without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±0.5% - sets base accuracy for all programmed output voltages |
| Output Range | 2.5V to 36V - enables flexible voltage setting via external resistors |
| Temp Coefficient | 20ppm/°C typical - ensures <±10mV drift over –40°C to +125°C |
| Dynamic Impedance | 0.15Ω typical - maintains regulation under fast load transients |
| Sink Current | 1mA to 100mA - supports direct feedback control in SMPS and linear regulators |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood and industrial environments |
| Package | SOT-23 - surface-mount compatible with high-density PCB layouts |
Pinout & Package
AN431AN-ATRE1 is housed in a standard SOT-23 package (2.90 × 1.30 × 1.00 mm), with gull-wing leads and RoHS-compliant lead-free finish. Pin assignments are verified per Diodes Inc. DS37414 Rev. 3–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Current return path | Connected to system ground or low-side reference point; completes shunt current loop |
| 2 (Cathode) | Regulated output node | Sinks adjustable current to maintain programmed VOUT; connects to feedback node of PWM controller or linear regulator |
| 3 (Ref) | Reference input | High-impedance sense terminal for resistor-divider feedback; determines output voltage ratio |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | Set precisely from 2.5V to 36V using only two external resistors-no trimming required |
| Low temperature drift | ±4.5mV max deviation over –40°C to +125°C-enables stable reference in uncontrolled thermal environments |
| Capacitive load stability | Stable with ≥10µF output capacitance-eliminates need for series resistance in adapter or charger outputs |
| Low reference current | 0.7µA typical-minimizes divider power loss and improves efficiency in battery-powered systems |
| High ESD rating | 2000V HBM-supports robust handling during automated assembly and field service |
Applications
| Switching Power Supply Feedback | Battery Charger Reference |
|---|---|
Use Scenario: Isolated flyback converter requiring accurate secondary-side voltage regulation. IC Role / Device Role / Timing Role: Shunt regulator providing precise feedback signal to optocoupler input, closing regulation loop without primary-side sensing. Use Value: Enables ±1% output accuracy across line/load/temperature with no auxiliary winding or transformer redesign. | Use Scenario: Constant-voltage/constant-current lithium-ion charger with programmable termination voltage. IC Role / Device Role / Timing Role: Adjustable reference setting CV threshold (e.g., 4.2V) and CC current limit via resistor network. Use Value: Achieves <±5mV reference error at 25°C and <±15mV over full temperature range-critical for cell longevity. |
| Voltage Adapter Module | Graphics Card VRM Monitoring |
Use Scenario: Low-cost 12V-to-5V adapter board for legacy peripherals. IC Role / Device Role / Timing Role: Precision shunt regulating 5V rail using external resistors and pass transistor. Use Value: Delivers 5.00V ±0.025V at 1A load with <0.1% line regulation-replaces discrete Zener + transistor solution. | Use Scenario: GPU voltage rail monitoring and fine-tuning in high-performance computing systems. IC Role / Device Role / Timing Role: Reference source for ADC-based rail telemetry and closed-loop DAC adjustment. Use Value: Provides stable 2.5V reference with <10µV RMS noise-ensures <0.5% ADC measurement accuracy for rail health diagnostics. |
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 reference, 0.5% tolerance, but higher temp coefficient (50ppm/°C typical) and 37Ω typical ZKA | Limited to commercial temp range (0°C to +70°C); unsuitable for extended industrial use | Select when cost sensitivity outweighs thermal stability requirements and ambient stays below 70°C |
| AS431ASTZTR-G1 | Same 0.5% tolerance and SOT-23 package, but 100ppm/°C temp coefficient and 1.2Ω ZKA | Higher output impedance degrades transient response in high-frequency SMPS feedback paths | Prefer only for non-critical biasing or low-bandwidth voltage monitoring where regulation speed is not essential |
Compared with TL431ACDBVR and AS431ASTZTR-G1, AN431AN-ATRE1 offers superior thermal stability (20ppm/°C vs. ≥50ppm/°C), lower dynamic impedance (0.15Ω vs. ≥1.2Ω), and full –40°C to +125°C qualification-making it optimal for automotive, industrial, and high-reliability power management designs.
Availability
AN431AN-ATRE1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger reference, and voltage adapter modules requiring stable component supply with guaranteed long-term continuity.
Supply support for AN431AN-ATRE1 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.
The AN431 product line delivers precision shunt regulation for feedback-critical power systems, targeting applications demanding tight voltage accuracy, wide temperature operation, and robustness in cost-sensitive designs.
FAQ
What is the minimum cathode current required for regulation?
The AN431AN-ATRE1 requires a minimum cathode current of 0.4mA (typical) to maintain regulation, with 1.0mA specified as the guaranteed minimum under all conditions. This ensures reliable startup and stability even with high-value feedback resistors or light-load scenarios in adapter and standby circuits.
Can AN431AN-ATRE1 replace a Zener diode directly?
Yes-it functions as a 3-pin drop-in replacement for Zener diodes in shunt regulator configurations, offering superior voltage accuracy (0.5% vs. typical 5% Zener tolerance), lower temperature drift, and programmable output. No circuit redesign is needed beyond adding the REF pin connection to the resistor divider midpoint.
Is AN431AN-ATRE1 suitable for high-frequency PWM feedback loops?
Yes-its 0.15Ω dynamic impedance and stable phase margin up to 10µF capacitive load enable clean response in flyback and forward converter feedback paths operating up to 500kHz. The low reference current (0.7µA) also minimizes divider-induced delay in fast-loop designs.
What does the "E1" suffix indicate in AN431AN-ATRE1?
The "E1" suffix denotes lead-free, RoHS-compliant packaging in tape-and-reel format (3000 units per reel), with Diodes Incorporated's standard green molding compound (halogen- and antimony-free). It confirms compliance with EU Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1.
AN431AN-ATRE1 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:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AN431AN-ATRE1 FAQ
1.How can I place an order for AN431AN-ATRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AN431AN-ATRE1 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 AN431AN-ATRE1 reliable?
The price and inventory of AN431AN-ATRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AN431AN-ATRE1 is usually 5 days.
3.What payment methods are accepted for AN431AN-ATRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AN431AN-ATRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AN431AN-ATRE1?
AN431AN-ATRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AN431AN-ATRE1 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 AN431AN-ATRE1?
For technical support, including AN431AN-ATRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AN431AN-ATRE1 requirements.
6.How does Aetrix verify that AN431AN-ATRE1 is sourced from the original manufacturer or authorized distributors?
All AN431AN-ATRE1 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 AN431AN-ATRE1 meets industry standards.
7.What is the process for return or replacement of AN431AN-ATRE1?
All AN431AN-ATRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AN431AN-ATRE1, 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 AN431AN-ATRE1 part is unused and in its original packaging.
Return procedure for AN431AN-ATRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AN431AN-ATRE1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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