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Diodes Incorporated AZ431BN-ATRE1
- Part No.:
- AZ431BN-ATRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431BN-ATRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,411
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Product details
Overview
AZ431BN-ATRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.8% reference voltage tolerance, 2.5V to 36V programmable output, and ±4.5mV typical temperature drift over –40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and voltage adapters where stable, low-impedance voltage reference is required.
For engineers reviewing the AZ431BN-ATRE1 datasheet, AZ431BN-ATRE1 pinout, AZ431BN-ATRE1 application, or AZ431BN-ATRE1 equivalent, key selection criteria include cathode current range (1–100mA), dynamic impedance (0.15Ω typ), thermal coefficient (20ppm/°C typ), and SOT23 package compatibility with high-density PCB layouts.
Technical Context
The AZ431BN-ATRE1 operates as a two-input, one-output shunt reference: the REF pin senses voltage via external resistor divider, while the CATHODE sinks adjustable current to maintain VREF = 2.500V ±20mV. Its internal bandgap core delivers sharp turn-on and low noise (<10µVRMS).
It functions within a 1mA–100mA cathode current range and supports capacitive loads up to 100µF without oscillation, enabled by internal compensation and <0.5Ω dynamic impedance at 10kHz. Thermal stability is ensured by 20ppm/°C typical tempco and 135.48°C/W junction-to-case resistance in SOT23.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500V ±20mV (0.8% tolerance; sets precise regulation point for external resistor network) |
| VKA Max | 36V (maximum cathode-to-anode voltage; enables use in 24V industrial rails and 32V adapter outputs) |
| IKA Range | 1mA to 100mA (supports both low-power biasing and high-current error amplification paths) |
| ZKA | 0.15Ω typical (low dynamic impedance ensures minimal output voltage shift under load transients) |
| Tempco | 20ppm/°C typical (enables ±4.5mV max drift across –40°C to +125°C; critical for automotive ambient operation) |
| θJA | 380°C/W (SOT23 thermal resistance; dictates derating above 70°C ambient without heatsinking) |
| IREF | 0.7–4µA (ultra-low reference input current reduces divider power loss and improves accuracy) |
Pinout & Package
AZ431BN-ATRE1 is packaged in RoHS-compliant, lead-free SOT23 (TO-236AB) with gull-wing leads and 1.9mm × 2.8mm footprint. The package supports reflow soldering per J-STD-020 and provides 380°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Reference ground return path; must be tied to system GND or feedback node common point |
| Pin 2 (Ref) | Reference input | Senses divided output voltage; connects to resistor divider midpoint for adjustable regulation |
| Pin 3 (Cathode) | Cathode output | Sinks regulated current to control external pass element (e.g., MOSFET base/gate or optocoupler LED) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5V to 36V set by two external resistors - eliminates need for multiple fixed-voltage references |
| Capacitive load stability | Stable with ≥100µF output capacitance - enables direct use in SMPS feedback loops without phase compensation |
| Low temperature drift | ±4.5mV max over –40°C to +125°C - ensures consistent regulation in automotive under-hood and industrial environments |
| High sink current capability | 100mA continuous cathode current - drives optocouplers, transistor bases, or small gate drivers directly |
| Low output noise | <10µVRMS (10Hz–10kHz) - preserves signal integrity in precision ADC reference and analog sensor circuits |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Regulation |
|---|---|
|
Use Scenario: Used in secondary-side feedback loop of isolated flyback converters to regulate 5V/12V/24V outputs. IC Role / Device Role / Timing Role: Shunt reference providing error signal to optocoupler LED, enabling primary-side PWM controller adjustment. Use Value: 0.15Ω dynamic impedance minimizes output voltage deviation during load steps; 20ppm/°C tempco maintains ±0.5% output accuracy across temperature. |
Use Scenario: Sets constant-voltage threshold in Li-ion/LiPo charger ICs or discrete linear charger designs. IC Role / Device Role / Timing Role: Precision voltage reference for comparator input or DAC feedback in CC/CV charge profile control. Use Value: 0.8% VREF tolerance ensures ±20mV absolute voltage accuracy at 2.5V sense point, critical for cell-level voltage compliance. |
| Voltage Adapter Reference | Graphic Card VRM Monitoring |
|
Use Scenario: Provides stable reference for 3.3V/5V DC-DC converter modules in industrial I/O adapters and fieldbus interfaces. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing Zener diode in compact, low-cost adapter PCBs with no dedicated reference IC space. Use Value: SOT23 package fits 2.8mm × 1.9mm area; 1mA minimum cathode current allows operation with high-value resistor dividers, reducing quiescent power. |
Use Scenario: Monitors GPU core voltage (e.g., 0.8–1.3V) via resistor divider scaling into AZ431BN-ATRE1 REF pin for rail health reporting. IC Role / Device Role / Timing Role: High-accuracy voltage sensing node feeding ADC or supervisor IC; not part of closed-loop regulation. Use Value: 4.5mV max temp drift ensures voltage reading remains within ±0.5% error across full GPU operating range (0–95°C junction). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | 0.5% VREF tolerance, 2.495–2.505V; higher IREF (2µA min); 0.22Ω ZKA | Higher accuracy but tighter layout sensitivity due to 0.22Ω ZKA and lower noise floor | Select when ±0.5% output regulation is mandatory and board space permits larger SOT23-5 footprint |
| AS431ARTDT | 0.8% VREF, same 2.5V nominal, but 100µA max IREF; 0.3Ω ZKA; -40°C to +105°C only | Limited temperature range and higher reference current reduce suitability for automotive or extended industrial use | Acceptable for cost-sensitive consumer adapters where ambient stays below 85°C and divider power budget allows 100µA draw |
Compared with TL431BIDBVR and AS431ARTDT, AZ431BN-ATRE1 offers optimal balance of 0.8% tolerance, 125°C operation, ultra-low IREF, and proven capacitive-load stability - making it preferred for high-reliability industrial power supplies and automotive charging systems.
Availability
AZ431BN-ATRE1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger voltage regulation, and voltage adapter reference requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AZ431BN-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
AZ431BN-ATRE1 belongs to Diodes' precision shunt regulator product line, designed specifically for high-stability, low-drift voltage reference in isolated power conversion and battery management systems.
FAQ
What is the minimum cathode current required for regulation in AZ431BN-ATRE1?
The minimum cathode current for stable regulation is 0.4mA, with 1.0mA recommended for guaranteed performance across temperature and voltage extremes. Below this threshold, reference voltage accuracy degrades beyond 0.8% tolerance, and dynamic impedance rises significantly above 0.5Ω.
Can AZ431BN-ATRE1 replace a standard 3.3V Zener diode directly?
No - AZ431BN-ATRE1 is a three-terminal adjustable shunt regulator, not a two-terminal Zener. It requires an external resistor divider on the REF pin to set output voltage. For 3.3V, use R1 = 10kΩ and R2 ≈ 32.5kΩ between cathode and anode to achieve VOUT = 2.5V × (1 + R2/R1).
Is AZ431BN-ATRE1 qualified for automotive applications?
Yes - it is rated for –40°C to +125°C operating ambient temperature, has AEC-Q200-compatible construction, and meets RoHS 3 and halogen-free "Green" requirements. However, it is not AEC-Q100 qualified as a standalone IC; system-level qualification is required for automotive use.
Does AZ431BN-ATRE1 require an external capacitor for stability?
No external capacitor is required for basic stability. The device remains stable with capacitive loads up to 100µF, verified across all operating conditions. Adding >1nF ceramic capacitor from REF to ANODE may improve noise rejection in high-EMI environments but is not mandatory.
AZ431BN-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:
- ±0.8%
- 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
AZ431BN-ATRE1 FAQ
1.How can I place an order for AZ431BN-ATRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BN-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 AZ431BN-ATRE1 reliable?
The price and inventory of AZ431BN-ATRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BN-ATRE1 is usually 5 days.
3.What payment methods are accepted for AZ431BN-ATRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BN-ATRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BN-ATRE1?
AZ431BN-ATRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BN-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 AZ431BN-ATRE1?
For technical support, including AZ431BN-ATRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BN-ATRE1 requirements.
6.How does Aetrix verify that AZ431BN-ATRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431BN-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 AZ431BN-ATRE1 meets industry standards.
7.What is the process for return or replacement of AZ431BN-ATRE1?
All AZ431BN-ATRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BN-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 AZ431BN-ATRE1 part is unused and in its original packaging.
Return procedure for AZ431BN-ATRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431BN-ATRE1 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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