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Diodes Incorporated AZ431BR-ATRE1
- Part No.:
- AZ431BR-ATRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AZ431BR-ATRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
AZ431BR-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 guaranteed thermal stability from −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 deviation over full temperature range.
For engineers reviewing the AZ431BR-ATRE1 datasheet, AZ431BR-ATRE1 pinout, AZ431BR-ATRE1 application, or AZ431BR-ATRE1 equivalent, key selection criteria include cathode current capability (1–100mA), low temperature coefficient (20ppm/°C typical), capacitive load stability, and SOT89 package compatibility for high-power dissipation designs.
Technical Context
The AZ431BR-ATRE1 operates as a two-input (REF, ANODE), one-output (CATHODE) shunt reference with internal bandgap-derived 2.5V reference. Its feedback loop enables precise external resistor-based voltage programming between VREF and 36V, while maintaining regulation down to 0.4mA minimum cathode current.
It features sharp turn-on characteristics and low 0.15Ω dynamic impedance at 1–100mA cathode current, enabling stable operation under varying load and line conditions. The device sustains reliable performance across −40°C to +125°C ambient with ≤16mV total reference drift and <1.2µA reference current variation over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±0.8% (2.480–2.520V); sets precise regulation threshold for external resistor divider |
| Cathode Voltage Range | 2.5V to 36V; supports wide-range adjustable output without external op-amp |
| Cathode Current Range | 1mA to 100mA continuous; enables direct sink control for medium-power regulation |
| Dynamic Impedance | 0.15Ω typical at 1–100mA; ensures minimal output voltage shift under load transients |
| Temp. Coefficient | 20ppm/°C typical; guarantees ≤16mV reference drift over −40°C to +125°C |
| Reference Current | 0.7–4µA typical; minimizes divider resistor power loss and improves efficiency |
| Operating Temp. | −40°C to +125°C; qualified for industrial and automotive under-hood environments |
Pinout & Package
AZ431BR-ATRE1 is packaged in RoHS-compliant, lead-free SOT89 (Option 1) with thermal pad on lead 3 (CATHODE) for enhanced power dissipation. Package outline matches JEDEC TO-243AA standard; θJA = 165°C/W, θJC = 29.8°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ANODE) | Anode connection | Connects to system ground or low-side return path; completes shunt current loop |
| 2 (REF) | Reference input | High-impedance node for external resistor divider; sets regulated output voltage |
| 3 (CATHODE) | Cathode output | High-current sink terminal; connects to regulated rail and dissipates power |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output | 2.5V to 36V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Capacitive Load Stability | Stable up to 100µF load capacitance - supports low-ESR ceramic output caps without oscillation |
| Low Reference Drift | 4.5mV typical deviation over −40°C to +125°C - reduces calibration overhead in field-deployed systems |
| High Sink Current | 100mA continuous cathode current - drives optocoupler LEDs or error amplifier inputs directly |
| Low Power Dissipation | 0.7–4µA reference current - enables high-value divider resistors, minimizing quiescent power |
Applications
| Switching Power Supply Feedback | Battery Charger Regulation |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 5V or 12V feedback threshold to optocoupler LED anode. Use Value: Enables ±1% output regulation across line/load/temperature with single external resistor pair and no secondary-side LDO. |
Use Scenario: Constant-voltage stage control in multi-cell Li-ion charger circuits. IC Role / Device Role / Timing Role: Precision voltage clamp setting termination voltage (e.g., 8.4V for 2S pack) before CC/CV transition. Use Value: Replaces discrete Zener + transistor stack, reducing BOM count and improving thermal tracking of reference point. |
| Voltage Adapter Reference | Graphic Card VRM Monitoring |
|
Use Scenario: Generating stable 3.3V or 5V auxiliary rails from higher intermediate bus (e.g., 12V). IC Role / Device Role / Timing Role: Shunt regulator acting as programmable voltage setpoint for linear post-regulator or supervisor IC input. Use Value: Delivers <100ppm/°C effective reference stability, eliminating need for trimming in cost-sensitive adapter modules. |
Use Scenario: Real-time GPU core voltage monitoring and margining in PCIe graphics cards. IC Role / Device Role / Timing Role: High-stability reference feeding ADC input or comparator for rail health verification. Use Value: Provides 2.5V基准 with <16mV total drift, enabling accurate ±10mV voltage margining across extended temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 0.5% initial tolerance, 0.5Ω typical ZKA, −40°C to +125°C, SOT23-5 | Higher accuracy but lower cathode current (100mA max), less robust under >10µF capacitive loads | Preferred when tighter initial tolerance is required and thermal dissipation is constrained |
| KA431AZTA | 2% initial tolerance, 1.0Ω ZKA, −25°C to +85°C, TO92 | Lower cost, wider package availability, but limited temp range and higher drift (±50mV) | Acceptable for consumer-grade adapters where cost dominates and ambient stays <70°C |
Compared with TL431CDBVR and KA431AZTA, AZ431BR-ATRE1 offers superior thermal stability (20ppm/°C vs. 35–50ppm/°C), higher cathode current headroom, and SOT89 thermal performance-making it optimal for industrial power supplies requiring long-term regulation integrity.
Availability
AZ431BR-ATRE1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and voltage adapter reference applications requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for AZ431BR-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-reliability power management, signal integrity, and protection solutions.
AZ431BR-ATRE1 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy, thermally stable voltage reference in cost-sensitive industrial and computing power systems.
FAQ
What is the minimum cathode current required for regulation in AZ431BR-ATRE1?
The AZ431BR-ATRE1 requires a minimum cathode current of 0.4mA to maintain regulation at VKA = VREF. This low turn-on threshold allows stable operation even with high-value feedback resistors, reducing standby power consumption in energy-sensitive applications like battery-powered adapters.
Can AZ431BR-ATRE1 drive a 100µF ceramic output capacitor without oscillation?
Yes-AZ431BR-ATRE1 maintains stability with up to 100µF capacitive load, as verified in the datasheet's "Stability Boundary Conditions vs. Load Capacitance" plot. Its internal compensation and low output impedance prevent ringing or sustained oscillation, supporting modern low-ESR ceramic capacitor designs.
How does the 0.8% reference tolerance affect output voltage accuracy in a 12V design?
In a 12V configuration using R1/R2 divider, the 0.8% VREF tolerance contributes ±0.02V error to the 2.5V reference, translating to ±0.096V (±0.8%) at 12V output-assuming ideal resistors. Total system error also depends on resistor tolerance and temperature drift, but the IC itself contributes minimal uncertainty.
Is AZ431BR-ATRE1 pin-compatible with TL431 in SOT89 footprint?
No-TL431 is not offered in SOT89; common TL431 packages are SO-8, TO-92, and SOT23-5. AZ431BR-ATRE1 uses SOT89 (3-pin, tab-connected cathode), which has different pinout (ANODE-REF-CATHODE) and thermal layout than TL431 variants. PCB redesign is required for substitution.
AZ431BR-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:
- ±0.8%
- 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-89-3
AZ431BR-ATRE1 FAQ
1.How can I place an order for AZ431BR-ATRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BR-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 AZ431BR-ATRE1 reliable?
The price and inventory of AZ431BR-ATRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BR-ATRE1 is usually 5 days.
3.What payment methods are accepted for AZ431BR-ATRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BR-ATRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BR-ATRE1?
AZ431BR-ATRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BR-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 AZ431BR-ATRE1?
For technical support, including AZ431BR-ATRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BR-ATRE1 requirements.
6.How does Aetrix verify that AZ431BR-ATRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431BR-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 AZ431BR-ATRE1 meets industry standards.
7.What is the process for return or replacement of AZ431BR-ATRE1?
All AZ431BR-ATRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BR-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 AZ431BR-ATRE1 part is unused and in its original packaging.
Return procedure for AZ431BR-ATRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431BR-ATRE1 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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