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Diodes Incorporated AZ431AN-ATRE1
- Part No.:
- AZ431AN-ATRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431AN-ATRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:30,632
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Product details
Overview
AZ431AN-ATRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator IC with 0.4% reference voltage tolerance, 2.5V to 36V programmable output, and guaranteed thermal stability from –40°C to +125°C. It replaces Zener diodes in feedback loops of switching power supplies, battery chargers, and precision voltage references, delivering low 0.15Ω dynamic impedance and 4.5mV typical reference deviation over full temperature range.
For engineers reviewing the AZ431AN-ATRE1 datasheet, AZ431AN-ATRE1 pinout, AZ431AN-ATRE1 application, or AZ431AN-ATRE1 equivalent, key selection criteria include cathode current capability (1–100mA), low temperature coefficient (20ppm/°C typical), stable operation under capacitive loads up to 100µF, and SOT23 package compatibility with high-density PCB layouts.
Technical Context
The AZ431AN-ATRE1 functions as a 2.5V bandgap-based precision reference with adjustable output via external resistor divider. Its internal architecture provides sharp turn-on characteristics and low output impedance, enabling stable regulation even with varying cathode voltage (VKA) from VREF to 36V and sink current from 1mA to 100mA.
It operates across –40°C to +125°C ambient, maintaining reference accuracy via low 20ppm/°C temperature coefficient and <4.5mV total deviation over full range. The device exhibits high immunity to cathode voltage variation (ΔVREF/ΔVKA ≤ –2.7mV/V) and ultra-low reference input current (0.7–4µA typical), minimizing divider network loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±0.4% (2.490–2.510V) - sets precise regulation threshold for feedback networks |
| Output Voltage Range | 2.5V to 36V - programmable via external resistive divider without additional components |
| Cathode Current Range | 1mA to 100mA - supports both low-power biasing and high-current shunt regulation |
| Dynamic Impedance | 0.15Ω typical - ensures minimal output voltage perturbation under load transients |
| Temp Coefficient | 20ppm/°C typical - guarantees <±8mV drift over –40°C to +125°C for stable long-term performance |
| Reference Input Current | 0.7–4µA typical - enables high-value resistor dividers (>1MΩ), reducing power loss and heat |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
Supplied in RoHS-compliant SOT23 package (2.9mm × 1.3mm × 1.0mm), AZ431AN-ATRE1 uses standard 3-pin configuration with anode, reference, and cathode terminals. Thermal resistance θJA is 380°C/W, requiring minimal copper area for thermal management in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Common return path for reference and cathode currents; tied to system ground or low-side return |
| Pin 2 (Ref) | Reference input | Senses divided output voltage; high-impedance node (<4µA input) enabling high-R divider networks |
| Pin 3 (Cathode) | Cathode output | Current-sinking terminal delivering regulated voltage; connects to feedback node of PWM controller or error amplifier |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5V to 36V set by two external resistors - eliminates need for multiple fixed-voltage references |
| High capacitive load stability | Stable with ≥100µF output capacitance - avoids oscillation in noisy or high-ESR power rail applications |
| Low temperature drift | 4.5mV typical deviation over –40°C to +125°C - ensures consistent regulation across environmental extremes |
| Low noise & impedance | 0.15Ω dynamic impedance and low output noise - preserves signal integrity in precision feedback paths |
| Wide operating range | –40°C to +125°C ambient with 150°C junction limit - supports industrial, computing, and automotive under-hood use |
Applications
| Switching Power Supply Feedback | Battery Charger Regulation |
|---|---|
|
Use Scenario: Primary-side feedback loop in isolated flyback or forward converters where optocoupler-coupled voltage sensing is required. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5V threshold to drive optocoupler LED, enabling accurate secondary-side voltage regulation. Use Value: Enables ±1% output voltage accuracy over line, load, and temperature while supporting compact SOT23 footprint on primary-side PCB. |
Use Scenario: Constant-voltage stage in multi-stage Li-ion or lead-acid battery chargers with adaptive termination. IC Role / Device Role / Timing Role: Adjustable reference setting charge termination voltage (e.g., 4.2V per cell) via resistor divider in linear or buck charger IC feedback path. Use Value: Delivers 0.4% reference accuracy and low temp drift to maintain tight charge voltage tolerance, extending battery cycle life and safety. |
| Voltage Adapter Reference | Graphic Card VRM Monitoring |
|
Use Scenario: Output voltage scaling and monitoring in universal AC/DC adapters with multiple USB-PD or legacy DC barrel outputs. IC Role / Device Role / Timing Role: Programmable shunt reference generating precise feedback thresholds for secondary-side supervisor ICs or microcontroller ADC inputs. Use Value: Supports rapid reconfiguration of output voltages (5V/9V/12V/15V/20V) using single BOM variant and resistor programming. |
Use Scenario: Real-time GPU core voltage (VDDC) monitoring and fine-tuning in high-performance graphics cards. IC Role / Device Role / Timing Role: High-stability reference feeding into analog comparator or ADC circuit that validates VRM output against GPU specification. Use Value: Ensures <±5mV measurement accuracy at 1.2V nominal, critical for detecting overvoltage faults before GPU damage occurs. |
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% initial tolerance, 50ppm/°C tempco, higher 2µA max IREF, SOT23-5 package with NC pin | Requires 5-pin layout; less stable over temperature than AZ431AN-ATRE1's 20ppm/°C spec | Choose when legacy TI design reuse is prioritized over lowest drift or smallest footprint |
| KA431AZTA | 0.8% tolerance, TO92 package only, 50ppm/°C tempco, 100µA max IREF | Through-hole mounting; unsuitable for high-density SMT boards or wide-temp industrial use | Acceptable for cost-sensitive, non-automotive consumer adapters where 0.4% accuracy is not required |
Compared with TL431ACDBVR and KA431AZTA, AZ431AN-ATRE1 offers superior thermal stability (20ppm/°C vs. 50ppm/°C), tighter 0.4% tolerance, lower reference current (0.7–4µA), and SOT23-3 footprint-making it optimal for space-constrained, high-accuracy, wide-temperature applications like server PSUs and EV chargers.
Availability
AZ431AN-ATRE1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and voltage adapter reference applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for AZ431AN-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 for industrial, computing, and consumer markets.
AZ431AN-ATRE1 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy voltage reference and feedback applications in power conversion systems where Zener replacement, thermal stability, and small-footprint SMT integration are critical.
FAQ
What is the maximum cathode voltage rating for AZ431AN-ATRE1?
The absolute maximum cathode-to-anode voltage (VKA) is 40V, but the recommended operating range is 2.5V to 36V. Exceeding 40V risks permanent damage; operation above 36V violates recommended conditions and may degrade reference accuracy or long-term reliability.
Can AZ431AN-ATRE1 drive a 100µF capacitor directly without oscillation?
Yes-datasheet Figure 8 confirms stable operation with ≥100µF load capacitance across cathode current levels from 1mA to 100mA. This is enabled by internal compensation and low 0.15Ω dynamic impedance, eliminating need for external stabilization components in most applications.
How does the 0.4% reference tolerance impact output voltage accuracy in a 12V application?
In a 12V design using R1/R2 divider, the 0.4% VREF tolerance contributes ±0.4% base error. With typical resistor tolerances (1%), total output error remains within ±1.5%, meeting requirements for Class II power supplies and industrial adapters without trimming.
Is AZ431AN-ATRE1 suitable for automotive under-hood applications?
Yes-it is rated for –40°C to +125°C ambient operation and qualified to AEC-Q200 stress test standards per Diodes Incorporated's automotive-grade variants. While AZ431AN-ATRE1 itself is NRND, its functional equivalents (e.g., AZ431AN-ATRG1) are in production and automotive-qualified.
AZ431AN-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:
- ±0.4%
- 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
AZ431AN-ATRE1 FAQ
1.How can I place an order for AZ431AN-ATRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AN-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 AZ431AN-ATRE1 reliable?
The price and inventory of AZ431AN-ATRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AN-ATRE1 is usually 5 days.
3.What payment methods are accepted for AZ431AN-ATRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AN-ATRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AN-ATRE1?
AZ431AN-ATRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AN-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 AZ431AN-ATRE1?
For technical support, including AZ431AN-ATRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AN-ATRE1 requirements.
6.How does Aetrix verify that AZ431AN-ATRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431AN-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 AZ431AN-ATRE1 meets industry standards.
7.What is the process for return or replacement of AZ431AN-ATRE1?
All AZ431AN-ATRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AN-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 AZ431AN-ATRE1 part is unused and in its original packaging.
Return procedure for AZ431AN-ATRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431AN-ATRE1 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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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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