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Diodes Incorporated AZ431AZ-BE1
- Part No.:
- AZ431AZ-BE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
AZ431AZ-BE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,115
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Product details
Overview
AZ431AZ-BE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.4% reference voltage tolerance, 2.5V nominal VREF, and guaranteed thermal stability from –40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and voltage adapters by delivering sharp turn-on, low 0.2Ω dynamic impedance, and stable regulation under capacitive loads up to 10µF.
For engineers reviewing the AZ431AZ-BE1 datasheet, AZ431AZ-BE1 pinout, AZ431AZ-BE1 application, or AZ431AZ-BE1 equivalent, this device is selected for precision feedback loops requiring programmable 2.5–18V output, low temperature drift (4.5mV typical over full range), and robust operation in industrial-grade power management circuits.
Technical Context
The AZ431AZ-BE1 implements an internal bandgap reference and high-gain error amplifier driving a NPN pass transistor, enabling precise cathode-to-anode voltage control via external resistor dividers. Its functional block diagram confirms direct feedback from cathode to reference input, with no internal compensation-stability relies on external RC networks and load capacitance limits.
It operates as a two-quadrant shunt regulator: sinking 1–100mA cathode current while maintaining VREF accuracy across –40°C to +125°C ambient, with <2.7mV/V cathode voltage sensitivity and <1.2µA reference current drift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500V ±0.4% (2.490–2.510V) - sets minimum programmable output voltage in feedback divider networks |
| VKA Max | 18V - maximum cathode-to-anode voltage before regulation loss or damage |
| IKA Range | 1.0–100mA - operational sink current window for stable regulation and thermal safety |
| ΔVREF Temp | 4.5mV typical (–40°C to +125°C) - ensures ≤0.18% output voltage drift in wide-temperature systems |
| ZKA | 0.2–0.5Ω (1kHz, 1–100mA) - enables tight output regulation under dynamic load transients |
| θJC | 107.04°C/W (TO-92 package) - defines thermal resistance from junction to case for heatsinkless PCB designs |
| ESD HBM | 2000V - supports handling in standard manufacturing without special ESD controls |
Pinout & Package
AZ431AZ-BE1 is supplied in TO-92 bulk packaging (lead form: straight lead, 0.1" pitch). The package has 3 leads with standardized mechanical dimensions per DS41517 Rev. 4–2, including 12.5mm body length and Φ1.6mm max diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node connected to internal bandgap; sets regulation point when biased via external divider |
| 2 (ANODE) | Anode Terminal | Common return path for cathode current; must be tied to system ground or low-side rail |
| 3 (CATHODE) | Cathode Output | Sinks regulated current to maintain VREF × (1 + R1/R2); connects to feedback node of DC-DC converter |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.5V to 18V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Thermal Stability | 20ppm/°C typical tempco - maintains <±0.25% output error across automotive and industrial temperature ranges |
| Capacitive Load Tolerance | Stable with ≥10µF ceramic output caps - simplifies EMI filtering without external compensation |
| Low Noise Performance | Sub-10µV RMS noise (10Hz–10kHz) - preserves signal integrity in precision analog feedback paths |
| Wide Operating Range | –40°C to +125°C ambient - qualified for under-hood, industrial PLC, and telecom power applications |
Applications
| Switching Power Supply Feedback | Battery Charger Regulation |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for AC-DC adapters and PoE injectors. IC Role / Device Role / Timing Role: Precision shunt reference providing feedback to optocoupler-driven primary controller. Use Value: Enables ±1% output voltage accuracy across line/load/temperature with minimal BOM count. |
Use Scenario: Constant-voltage stage control in multi-cell Li-ion battery charging circuits. IC Role / Device Role / Timing Role: Adjustable reference setting charge termination threshold (e.g., 4.2V/cell). Use Value: Supports accurate cell balancing and prevents overcharge with <0.4% initial tolerance. |
| Voltage Adapter Reference | Graphics Card VRM Monitoring |
Use Scenario: Programmable 5V/3.3V/1.8V generation in USB-C PD sink adapters and FPGA I/O banks. IC Role / Device Role / Timing Role: Shunt-based reference for linear post-regulators or DAC-controlled buck feedback. Use Value: Delivers stable reference despite variable input voltage (5–20V) and transient load steps. |
Use Scenario: Real-time GPU core voltage monitoring and closed-loop adjustment in discrete graphics cards. IC Role / Device Role / Timing Role: High-stability reference for ADC input scaling in VRM telemetry circuits. Use Value: Ensures <±5mV measurement accuracy over –40°C to +105°C GPU junction temperatures. |
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% VREF tolerance, 2.495V min, SOT-23-6 package, higher IREF (1µA typ) | Requires different PCB footprint; slightly looser initial accuracy but wider supplier availability | Select when SOT-23-6 layout exists and RoHS+Green compliance is not mandatory |
| KA431AZTA | 0.8% VREF tolerance, TO-92 only, higher ΔVREF (16mV max over –40°C to +125°C) | Lower cost but reduced thermal stability; suitable for consumer-grade non-critical rails | Select for cost-sensitive applications where ±0.8% output tolerance is acceptable |
Compared with TL431ACDBVR and KA431AZTA, AZ431AZ-BE1 offers tighter 0.4% VREF tolerance and lower 4.5mV typical ΔVREF over temperature-critical for industrial power supplies demanding long-term calibration stability without periodic recalibration.
Availability
AZ431AZ-BE1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and voltage adapter reference applications requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AZ431AZ-BE1 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 ICs for power management, signal integrity, and connectivity solutions.
AZ431AZ-BE1 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy voltage reference and feedback applications in industrial, computing, and consumer power systems.
FAQ
What is the minimum cathode current required for regulation in AZ431AZ-BE1?
The minimum cathode current for stable regulation is 0.4mA (typical) and 1.0mA (max) at VREF, per Electrical Characteristics Table on page 5 of DS41517 Rev. 4–2. Below this threshold, the device exits regulation and VREF accuracy degrades rapidly-designs must ensure continuous IKA ≥1.0mA under all operating conditions including light-load and startup.
Can AZ431AZ-BE1 drive a 10µF ceramic capacitor directly at its cathode?
Yes-performance curves on page 8 confirm stable operation with ≥10µF ceramic output capacitance at VKA = 5V and 10V, with no oscillation observed. This eliminates need for series damping resistors in most DC-DC feedback applications, reducing component count and board space.
How does the 0.4% VREF tolerance impact output voltage accuracy in a 12V application?
In a 12V design using R1/R2 = 3.8, the 0.4% VREF tolerance contributes ≤0.048V (0.4%) to total output error. Combined with resistor tolerance (e.g., 1% R1/R2), total error remains within ±1.2%, meeting requirements for industrial power rails without trimming.
Is AZ431AZ-BE1 pin-compatible with standard TO-92 Zener diodes?
No-it is not pin-compatible with generic Zeners. While both use TO-92 packages, AZ431AZ-BE1 has active REF/ANODE/CATHODE terminals requiring correct external biasing; Zeners have only anode/cathode. Direct replacement requires circuit redesign to add the reference divider network.
AZ431AZ-BE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 18 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431AZ-BE1 FAQ
1.How can I place an order for AZ431AZ-BE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AZ-BE1 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 AZ431AZ-BE1 reliable?
The price and inventory of AZ431AZ-BE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AZ-BE1 is usually 5 days.
3.What payment methods are accepted for AZ431AZ-BE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AZ-BE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AZ-BE1?
AZ431AZ-BE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AZ-BE1 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 AZ431AZ-BE1?
For technical support, including AZ431AZ-BE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AZ-BE1 requirements.
6.How does Aetrix verify that AZ431AZ-BE1 is sourced from the original manufacturer or authorized distributors?
All AZ431AZ-BE1 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 AZ431AZ-BE1 meets industry standards.
7.What is the process for return or replacement of AZ431AZ-BE1?
All AZ431AZ-BE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AZ-BE1, 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 AZ431AZ-BE1 part is unused and in its original packaging.
Return procedure for AZ431AZ-BE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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