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Diodes Incorporated AZ431BZ-AE1
- Part No.:
- AZ431BZ-AE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
AZ431BZ-AE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
AZ431BZ-AE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.8% reference voltage tolerance, 2.5V to 36V programmable output, and thermal stability across –40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and voltage adapters, delivering low 0.15Ω dynamic impedance and 4.5mV typical reference deviation over full temperature range.
For engineers reviewing the AZ431BZ-AE1 datasheet, AZ431BZ-AE1 pinout, AZ431BZ-AE1 application, or AZ431BZ-AE1 equivalent, key selection criteria include cathode voltage rating (36V max), sink current capability (1–100mA), TO92 package thermal resistance (165°C/W), and RoHS-compliant lead-free construction.
Technical Context
The AZ431BZ-AE1 operates as a two-input (REF, ANODE), one-output (CATHODE) shunt reference with internal bandgap-derived 2.5V reference and high-gain error amplifier. Its sharp turn-on and low output impedance enable stable regulation under capacitive loads up to 100µF without oscillation.
It functions in feedback loops where cathode voltage is set by external resistor dividers, supporting precision 5V/1A regulators and PWM converter references. The device maintains regulation down to 0.4mA minimum cathode current and exhibits <1.0µA off-state leakage at 36V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±0.8% (2.480–2.520V); sets precise regulation point for external divider networks |
| Cathode Voltage Range | 2.5V to 36V; enables wide-range output programming while maintaining regulation stability |
| Cathode Current Range | 1.0mA to 100mA; supports both low-power biasing and higher-current shunt regulation |
| Dynamic Impedance | 0.15Ω typical; ensures minimal output voltage variation under load transients |
| Temp. Coefficient | 20ppm/°C typical; guarantees <16mV total drift from –40°C to +125°C |
| Operating Temp. | –40°C to +125°C; qualified for industrial and automotive under-hood environments |
| Package | TO92 (Bulk); 165°C/W junction-to-ambient thermal resistance for passive heatsinking |
Pinout & Package
AZ431BZ-AE1 is housed in a through-hole TO92 package with 1000-unit bulk packaging. Pin assignments are standardized: Pin 1 = ANODE, Pin 2 = REFERENCE, Pin 3 = CATHODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Anode connection | Return path for reference current; tied to system ground or low-side return in shunt configurations |
| Pin 2 (REF) | Reference input | Senses divided cathode voltage; internal 2.5V comparator triggers regulation when this node reaches VREF |
| Pin 3 (CATHODE) | Cathode output | Regulated output node; sinks current to maintain set voltage via external resistor network |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.5V–36V via two-resistor divider; eliminates need for multiple fixed-voltage references |
| Low temperature drift | 4.5mV typical deviation over –40°C to +125°C; reduces calibration burden in wide-temp designs |
| High capacitive load stability | Stable with ≥100µF output capacitance; avoids external compensation in adapter and PSU applications |
| Low reference current | 0.7µA typical at 25°C; minimizes divider power loss and improves efficiency in battery-powered systems |
| RoHS-compliant TO92 | Lead-free, halogen-free, antimony-free "Green" construction; meets EU Directive 2015/863/EU |
Applications
| Switching Power Supply | Battery Charger |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler feedback loop to regulate output voltage. Use Value: 0.8% initial tolerance and 20ppm/°C TC ensure ±1.5% output accuracy across line/load/temperature. |
Use Scenario: Constant-voltage stage control in Li-ion USB wall adapters. IC Role / Device Role / Timing Role: Adjustable reference setting charge termination threshold (e.g., 4.2V ±0.03V). Use Value: Low 0.15Ω dynamic impedance prevents voltage droop during fast load steps during CC/CV transition. |
| Voltage Adapter | Graphic Card VRM Monitor |
Use Scenario: 12V-to-5V/3.3V local regulation on peripheral interface boards. IC Role / Device Role / Timing Role: Shunt-based post-regulator for noise-sensitive analog rails. Use Value: Low 0.7µA reference current enables high-resistor-divider design, reducing quiescent power below 100µW. |
Use Scenario: GPU core voltage monitoring and margining in desktop graphics cards. IC Role / Device Role / Timing Role: Precision reference for ADC input scaling in rail telemetry circuits. Use Value: 4.5mV max temp drift ensures <±5mV measurement error over full operating range, critical for closed-loop margining. |
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% tolerance, SOT23-5 package, 370mW PD, θJA = 380°C/W | Higher thermal resistance limits power handling; requires PCB copper pour for >50mA operation | Select when board space is constrained and thermal budget allows SOT23 mounting |
| KA431AZTA | 2% tolerance, TO92 package, no "Green" compliance, 1000-unit ammo pack only | Larger voltage drift (±50mV over temp) reduces accuracy in precision adapters | Select for cost-sensitive, non-RoHS industrial legacy designs where 2% tolerance is acceptable |
Compared with TL431ACDBVR and KA431AZTA, AZ431BZ-AE1 offers tighter 0.8% tolerance and guaranteed RoHS/Green compliance in TO92 bulk format-making it optimal for new industrial power designs requiring traceable sourcing, thermal robustness, and regulatory alignment without SMT rework.
Availability
AZ431BZ-AE1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and voltage adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole assembly.
Supply support for AZ431BZ-AE1 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 ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
AZ431BZ-AE1 belongs to Diodes' precision shunt regulator product line, designed specifically for high-stability, low-drift voltage reference applications in cost-sensitive, thermally demanding power conversion systems.
FAQ
What is the minimum cathode current required for regulation in AZ431BZ-AE1?
The AZ431BZ-AE1 requires a minimum cathode current of 0.4mA to maintain regulation, as specified in the Electrical Characteristics table (IKA(Min) parameter). This low threshold enables reliable operation even with high-value resistor dividers in low-power adapter designs.
Can AZ431BZ-AE1 replace a standard Zener diode directly?
Yes-AZ431BZ-AE1 is a functional drop-in replacement for Zener diodes in shunt regulator topologies. Its three-terminal architecture uses an external resistor divider to set output voltage, offering superior temperature stability (20ppm/°C vs. typical Zener's 5000ppm/°C) and sharper knee characteristics.
What is the maximum cathode voltage rating for continuous operation?
The maximum continuous cathode voltage for AZ431BZ-AE1 is 36V, per Recommended Operating Conditions. Absolute maximum rating is 40V, but sustained operation above 36V risks thermal runaway and reduced reliability, especially at elevated ambient temperatures.
Does AZ431BZ-AE1 require external compensation for stability?
No external compensation is required. The AZ431BZ-AE1 is internally compensated and remains stable with output capacitances up to 100µF, as verified in the Stability Boundary Conditions graph (Figure 8). This simplifies design in switching power supplies and battery charger feedback loops.
AZ431BZ-AE1 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):
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431BZ-AE1 FAQ
1.How can I place an order for AZ431BZ-AE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BZ-AE1 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 AZ431BZ-AE1 reliable?
The price and inventory of AZ431BZ-AE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BZ-AE1 is usually 5 days.
3.What payment methods are accepted for AZ431BZ-AE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BZ-AE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BZ-AE1?
AZ431BZ-AE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BZ-AE1 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 AZ431BZ-AE1?
For technical support, including AZ431BZ-AE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BZ-AE1 requirements.
6.How does Aetrix verify that AZ431BZ-AE1 is sourced from the original manufacturer or authorized distributors?
All AZ431BZ-AE1 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 AZ431BZ-AE1 meets industry standards.
7.What is the process for return or replacement of AZ431BZ-AE1?
All AZ431BZ-AE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BZ-AE1, 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 AZ431BZ-AE1 part is unused and in its original packaging.
Return procedure for AZ431BZ-AE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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