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Diodes Incorporated AZ431AZ-ATRE1
- Part No.:
- AZ431AZ-ATRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431AZ-ATRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
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Product details
Overview
AZ431AZ-ATRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.4% reference voltage tolerance, 2.5V to 36V programmable output, and guaranteed thermal stability over −40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references, delivering low 0.15Ω dynamic impedance and 4.5mV typical reference voltage deviation across temperature.
For engineers reviewing the AZ431AZ-ATRE1 datasheet, AZ431AZ-ATRE1 pinout, AZ431AZ-ATRE1 application, or AZ431AZ-ATRE1 equivalent, key selection criteria include cathode voltage range (up to 36V), sink current capability (1–100mA), TO92 package compatibility, and RoHS-compliant lead-free construction for industrial and consumer power regulation designs.
Technical Context
The AZ431AZ-ATRE1 operates as a two-input, one-output shunt reference: the REF pin senses internal 2.5V bandgap, while the CATHODE pin sinks adjustable current to maintain regulated voltage via external resistor divider. Its sharp turn-on and low 20ppm/°C temperature coefficient enable stable feedback in isolated DC-DC converters and adaptive charging circuits.
It functions without external compensation under capacitive loads up to 100µF, supported by high small-signal gain (>50dB at 1kHz) and low 0.7µA typical reference input current. The device maintains regulation down to 0.4mA cathode current and exhibits <1µA off-state leakage at 36V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±0.4% - sets precise regulation point for external resistor divider networks |
| Output Voltage Range | 2.5V to 36V - programmable via two-resistor feedback, enabling flexible system-level voltage scaling |
| Cathode Current Range | 1mA to 100mA - supports both low-power biasing and high-current shunt regulation |
| Temp Coefficient | 20ppm/°C typical - ensures ≤16mV drift over −40°C to +125°C, critical for automotive ambient operation |
| Dynamic Impedance | 0.15Ω typical - minimizes output voltage perturbation during load transients in feedback loops |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, industrial SMPS, and embedded power rails |
| Package | TO92 (Ammo Packing) - through-hole compatible, 2000-unit reel, suitable for wave soldering and legacy PCBs |
Pinout & Package
Package: TO92 (Ammo Packing), 3-pin through-hole, lead-free and RoHS compliant per EU Directive 2015/863/EU. Dimensions: 4.3–4.7mm body width, 12.5–14.5mm length, 1.27mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode connection | Connected to ground or lowest potential node; completes shunt current path |
| Pin 2 (Ref) | Reference input | Senses internal 2.5V bandgap; tied to resistor divider midpoint for voltage setting |
| Pin 3 (Cathode) | Cathode output | Sinks adjustable current to regulate external voltage rail; connects to supply output |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output | 2.5V–36V via external resistors - eliminates need for multiple fixed-voltage references |
| Capacitive Load Stability | Stable with ≥100µF output capacitance - enables direct use in noisy switcher outputs without added compensation |
| Low Temp Drift | 4.5mV typical deviation over full range - reduces calibration burden in precision analog systems |
| Sink Current Capacity | 100mA max continuous - supports high-gain optocoupler interfaces in isolated flyback controllers |
| RoHS/Green Compliance | Halogen- and antimony-free, <900ppm Br+Cl - meets IPC-1752A material declaration requirements |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Reference |
|---|---|
|
Use Scenario: Primary-side feedback in isolated flyback converters using optocoupler-coupled error amplification. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.5V reference to drive optocoupler LED, closing secondary-side voltage regulation loop. Use Value: Enables ±1% output voltage accuracy across line/load/temperature, replacing discrete Zener + transistor solutions. |
Use Scenario: Constant-voltage stage in multi-cell Li-ion charger ICs or discrete charge controllers. IC Role / Device Role / Timing Role: Adjustable reference setting termination voltage (e.g., 4.2V/cell) via resistor network on REF pin. Use Value: Achieves 0.4% initial accuracy and <16mV thermal drift, ensuring cell safety and cycle life compliance. |
| Voltage Adapter Regulation | Graphic Card VRM Monitoring |
|
Use Scenario: Low-cost 5V/12V adapter board requiring stable output despite input ripple and load variation. IC Role / Device Role / Timing Role: Shunt-based linear regulator operating in parallel with switching stage to suppress residual ripple. Use Value: Delivers <10mVpp output noise and 0.15Ω impedance, improving transient response vs. Zener-only designs. |
Use Scenario: Precision voltage monitoring circuit on GPU power delivery boards for real-time rail validation. IC Role / Device Role / Timing Role: Reference source for ADC input scaling or comparator threshold in rail health detection. Use Value: Maintains 2.5V reference stability across −40°C to +125°C junction temp, enabling reliable fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 0.5% VREF tolerance, SOIC-8 package, higher 1.0mA min cathode current | SMT-only layout; requires PCB redesign for TO92 footprint replacement | Preferred for new SMT designs needing tighter long-term drift spec (50ppm/°C max) |
| KA431AZTA | 0.8% VREF tolerance, same TO92 package, 10µA higher IREF (typ 1.0µA) | Lower cost but reduced initial accuracy; acceptable where ±1% system tolerance suffices | Drop-in replacement if 0.4% accuracy not required and cost sensitivity dominates |
Compared with TL431ACDR and KA431AZTA, AZ431AZ-ATRE1 offers superior initial accuracy (0.4% vs. 0.5%/0.8%) and lower temperature drift (20ppm/°C vs. 50ppm/°C/30ppm/°C), making it optimal for high-stability feedback paths where TO92 through-hole assembly is retained.
Availability
AZ431AZ-ATRE1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and voltage adapters requiring stable component supply with full industrial temperature support and RoHS compliance.
Supply support for AZ431AZ-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 devices for industrial, computing, and consumer markets.
The AZ431-A series targets precision voltage regulation in cost-sensitive, thermally demanding power systems-designed specifically to replace Zener diodes with improved accuracy, stability, and design flexibility.
FAQ
What is the minimum cathode current required for regulation in AZ431AZ-ATRE1?
The AZ431AZ-ATRE1 requires a minimum cathode current of 0.4mA to maintain regulation, verified per datasheet Section 5 (Electrical Characteristics). This low threshold enables stable operation even with high-value feedback resistors, reducing quiescent power in battery-powered systems.
Can AZ431AZ-ATRE1 be used with ceramic output capacitors exceeding 10µF?
Yes-AZ431AZ-ATRE1 remains stable with ceramic capacitors up to 100µF, as confirmed in Figure 8 (Stability Boundary Conditions vs. Load Capacitance). No external compensation is needed, simplifying layout in space-constrained switcher outputs.
How does the 0.4% reference voltage tolerance impact system-level accuracy?
The 0.4% VREF tolerance directly limits total output voltage error in resistor-divider configurations. For a 5V setpoint (R1/R2 = 1), worst-case error is ±20mV before considering resistor tolerance and temperature drift-enabling Class I accuracy in mid-tier power supplies.
Is AZ431AZ-ATRE1 pin-compatible with standard TO92 Zener diodes?
No-while both use TO92 packaging, AZ431AZ-ATRE1 has three terminals (Anode, Ref, Cathode) versus two-terminal Zeners. Direct replacement requires modifying the PCB to route the REF pin to the feedback node, but it eliminates Zener's poor temperature stability and sharp knee limitations.
AZ431AZ-ATRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431AZ-ATRE1 FAQ
1.How can I place an order for AZ431AZ-ATRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AZ-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 AZ431AZ-ATRE1 reliable?
The price and inventory of AZ431AZ-ATRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AZ-ATRE1 is usually 5 days.
3.What payment methods are accepted for AZ431AZ-ATRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AZ-ATRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AZ-ATRE1?
AZ431AZ-ATRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AZ-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 AZ431AZ-ATRE1?
For technical support, including AZ431AZ-ATRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AZ-ATRE1 requirements.
6.How does Aetrix verify that AZ431AZ-ATRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431AZ-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 AZ431AZ-ATRE1 meets industry standards.
7.What is the process for return or replacement of AZ431AZ-ATRE1?
All AZ431AZ-ATRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AZ-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 AZ431AZ-ATRE1 part is unused and in its original packaging.
Return procedure for AZ431AZ-ATRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431AZ-ATRE1 Tags
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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