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Diodes Incorporated AZ431AR-ATRE1
- Part No.:
- AZ431AR-ATRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AZ431AR-ATRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:637
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Product details
Overview
AZ431AR-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 ±4.5mV typical temperature drift over –40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references where low dynamic impedance (0.15Ω typ), sharp turn-on, and capacitive-load stability are required.
For engineers reviewing the AZ431AR-ATRE1 datasheet, AZ431AR-ATRE1 pinout, AZ431AR-ATRE1 application, or AZ431AR-ATRE1 equivalent, this device serves as a thermally stable, low-noise, adjustable voltage reference with sink current capability up to 100mA and RoHS-compliant SOT89 packaging for high-reliability power regulation designs.
Technical Context
The AZ431AR-ATRE1 operates as a two-input, one-output shunt regulator: the REF pin senses a fraction of cathode voltage via external resistive divider, while the internal bandgap reference (2.500V typ) compares it to generate error-driven cathode current. Its architecture enables precise closed-loop regulation without external op-amps.
It features low output impedance (0.15Ω typ at 1–100mA), 20ppm/°C typical temperature coefficient, and stable operation with load capacitance up to 100µF-enabling direct use in feedback networks of DC-DC converters and linear post-regulators without phase-compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±0.4% (2.490–2.510V): Enables accurate 3.3V, 5V, or custom rail generation with minimal resistor tolerance dependency. |
| Output Voltage Range | 2.5V to 36V (programmable): Supports wide-range adapter, charger, and industrial supply designs using only two external resistors. |
| Temp Coefficient | 20ppm/°C typical: Ensures ≤±16mV drift across –40°C to +125°C, critical for automotive and industrial ambient stability. |
| Cathode Current | 1.0–100mA operating range: Delivers sufficient sink current for TL431-class feedback loops and current-source configurations. |
| Dynamic Impedance | 0.15Ω typical (1–100mA, ≤1kHz): Provides low-noise, high-PSRR regulation unaffected by ripple or transient load steps. |
| Thermal Resistance | 29.80°C/W (θJC, SOT89): Enables >1W dissipation capability with proper PCB copper area, supporting high-current shunt applications. |
| Operating Temp | –40°C to +125°C ambient: Qualified for under-hood automotive, industrial control, and telecom power systems. |
Pinout & Package
Package: SOT89 (3-pin, surface-mount, exposed thermal pad). Pin assignments confirmed per Diodes DS36721 Rev.6-2, Figure 1 (SOT89 Option 1 top view): Pin 1 = ANODE, Pin 2 = REF, Pin 3 = CATHODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Anode connection to ground or low-side return path | Completes shunt current loop; must be low-impedance to GND for stable regulation and thermal performance. |
| Pin 2 (REF) | Reference input node | Senses divided cathode voltage; high-impedance (0.7–4µA typical) to minimize divider loading error. |
| Pin 3 (CATHODE) | Regulated output terminal | Sinks adjustable current to maintain set voltage; connects to feedback node of PWM controller or error amplifier. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reference voltage | Set precisely from 2.5V to 36V using two external resistors-no trimming or calibration needed. |
| Capacitive-load stability | Stable with ≥100µF output capacitance-eliminates need for compensation networks in SMPS feedback paths. |
| Low temperature drift | ±4.5mV max deviation over full –40°C to +125°C range-ensures consistent regulation in harsh environments. |
| High sink current capacity | 100mA continuous cathode current-supports high-gain optocoupler drivers and fast transient response. |
| RoHS-compliant & green | Lead-free, halogen- and antimony-free SOT89 package (G43A marking)-meets EU RoHS 3 and environmental compliance mandates. |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Reference |
|---|---|
|
Use Scenario: Primary-side feedback in isolated flyback or forward converters using optocoupler-coupled error signal. IC Role / Device Role / Timing Role: Precision shunt reference generating stable error voltage proportional to output rail. Use Value: Replaces discrete Zener + transistor with 0.4% initial accuracy and <0.2Ω dynamic impedance for tighter output regulation. |
Use Scenario: Constant-voltage stage in Li-ion or lead-acid battery charging circuits with microcontroller supervision. IC Role / Device Role / Timing Role: Adjustable voltage reference setting charge termination threshold (e.g., 4.2V/cell). Use Value: Enables ±5mV absolute accuracy at 4.2V using 1% resistors-critical for cell longevity and safety compliance. |
| Voltage Adapter Regulation | Graphics Card VRM Monitoring |
|
Use Scenario: Low-cost AC/DC adapter or USB-C PD sink with fixed or selectable output voltages (5V/9V/12V). IC Role / Device Role / Timing Role: Programmable shunt regulator defining output voltage via resistor network on secondary side. Use Value: Achieves <1% total output variation across line/load/temp with no active pass element-reducing BOM cost and footprint. |
Use Scenario: Precision voltage monitoring and margining circuitry on GPU power delivery rails (e.g., 0.8–1.2V core). IC Role / Device Role / Timing Role: High-stability reference for ADC input scaling or comparator threshold in rail health monitoring. Use Value: 20ppm/°C TC and 0.4% tolerance ensure <±10mV error over full board temperature range-improving fault detection reliability. |
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 (Texas Instruments) | 0.5% VREF tolerance, 2.495–2.505V; higher IREF (1–4µA); θJA = 210°C/W (SOIC-8) | Larger SOIC-8 footprint; lower thermal performance than SOT89; requires derating above 60°C ambient | Select when legacy TI design compatibility or SOIC layout reuse is prioritized over thermal density. |
| KA431AZTA (ON Semiconductor) | 2.5V ±0.5% tolerance; TO92 package only; 165°C/W θJA; -25°C to +85°C temp range | Through-hole mounting; limited industrial temperature support; unsuitable for automotive or extended-range designs | Select only for cost-sensitive, non-automotive, non-industrial consumer applications with manual assembly. |
Compared with TL431ACDR and KA431AZTA, AZ431AR-ATRE1 offers superior thermal performance (29.8°C/W θJC), wider operating temperature (–40°C to +125°C), and tighter 0.4% reference tolerance-making it optimal for high-density, high-reliability power regulation where thermal management and precision are critical.
Availability
AZ431AR-ATRE1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and voltage adapters requiring stable component supply, long-term lifecycle assurance, and RoHS/green compliance.
Supply support for AZ431AR-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-performance power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AZ431-A series was designed as a drop-in, high-precision replacement for Zener diodes in feedback and reference applications-emphasizing thermal stability, low noise, and wide voltage programmability for next-generation power systems.
FAQ
What is the minimum cathode current required for regulation in AZ431AR-ATRE1?
The AZ431AR-ATRE1 requires a minimum cathode current of 0.4mA (typical) and 1.0mA (max) to maintain regulation, as specified in the Electrical Characteristics table (IKA(Min) parameter). This ensures stable operation even under light-load conditions in feedback circuits where optocoupler LED current may be low.
Can AZ431AR-ATRE1 replace a standard Zener diode directly in existing designs?
Yes-AZ431AR-ATRE1 can directly replace Zener diodes in most shunt regulator applications. Its three-terminal configuration requires adding a resistor divider between cathode and reference pins, but eliminates Zener's poor temperature stability and high dynamic impedance, improving overall system accuracy and transient response.
Does AZ431AR-ATRE1 require external compensation for stability?
No external compensation is required. The AZ431AR-ATRE1 is internally compensated and remains stable with output capacitance up to 100µF, as verified in the Stability Boundary Conditions vs. Load Capacitance plot (DS36721 p.8). This simplifies design in SMPS feedback loops and eliminates compensation component selection effort.
What is the maximum power dissipation capability of AZ431AR-ATRE1 in SOT89 package?
In SOT89 package, AZ431AR-ATRE1 has a junction-to-case thermal resistance (θJC) of 29.80°C/W and a maximum junction temperature of +150°C. With 25°C ambient and 1-inch² 2oz copper pad, it supports up to ~1.2W continuous dissipation-sufficient for 100mA sink at 12V differential (1.2W), validated in Absolute Maximum Ratings (PD = 1.2W implied by θJC and TJ limits).
AZ431AR-ATRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- 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-89-3
AZ431AR-ATRE1 FAQ
1.How can I place an order for AZ431AR-ATRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AR-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 AZ431AR-ATRE1 reliable?
The price and inventory of AZ431AR-ATRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AR-ATRE1 is usually 5 days.
3.What payment methods are accepted for AZ431AR-ATRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AR-ATRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AR-ATRE1?
AZ431AR-ATRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AR-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 AZ431AR-ATRE1?
For technical support, including AZ431AR-ATRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AR-ATRE1 requirements.
6.How does Aetrix verify that AZ431AR-ATRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431AR-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 AZ431AR-ATRE1 meets industry standards.
7.What is the process for return or replacement of AZ431AR-ATRE1?
All AZ431AR-ATRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AR-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 AZ431AR-ATRE1 part is unused and in its original packaging.
Return procedure for AZ431AR-ATRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431AR-ATRE1 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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