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Diodes Incorporated AZ431LBRTR-G1
- Part No.:
- AZ431LBRTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AZ431LBRTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,264
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Product details
Overview
AZ431LBRTR-G1 from Diodes Incorporated is a 1.0% tolerance, adjustable precision shunt voltage reference IC in SOT89 package, designed for cathode-anode-reference three-terminal configuration. It delivers stable 1.24V to 18V output via two external resistors, features 0.05Ω typical dynamic impedance, ±4mV max reference voltage deviation over –40°C to +125°C, and supports sink current from 0.1mA to 100mA - used in switching power supply feedback loops and motherboard VRM reference circuits.
For engineers reviewing the AZ431LBRTR-G1 datasheet, AZ431LBRTR-G1 pinout, AZ431LBRTR-G1 application, or AZ431LBRTR-G1 equivalent, this page provides verified pin assignments across SOT89 variants, thermal resistance (29.8°C/W), RoHS/Green compliance status, and direct substitution guidance against TL431B variants with validated parameter-level differences.
Technical Context
The AZ431LBRTR-G1 implements a bandgap-based precision reference core with internal error amplifier and output stage optimized for shunt regulation. Its sharp turn-on characteristic and low 20ppm/°C temperature coefficient ensure minimal drift across industrial temperature range (–40°C to +125°C).
It operates as a programmable 3-terminal shunt regulator: REF pin senses divided output voltage, ANODE connects to system ground or return path, and CATHODE sinks current to maintain regulated voltage. The device remains stable under capacitive loads up to 100nF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.240 V nominal, ±1.0% tolerance (1.228–1.252 V) at 10mA cathode current - sets absolute accuracy of regulated output voltage. |
| Dynamic Impedance (ZKA) | 0.05 Ω typical (≤0.15 Ω max) at 1–100mA - ensures minimal output voltage variation under load transients. |
| Temperature Coefficient | 20 ppm/°C typical - guarantees ≤±4 mV total drift from –40°C to +125°C, critical for high-accuracy feedback paths. |
| Cathode Current Range | 0.1 mA to 100 mA - supports wide-range biasing and high-current sinking in SMPS error amplifiers and current sources. |
| Operating Temperature | –40°C to +125°C ambient - enables use in automotive under-hood and industrial power-conversion environments. |
| Thermal Resistance (θJC) | 29.8°C/W for SOT89 package - allows ≥770 mW power dissipation before junction exceeds 150°C limit. |
| Output Noise | Low broadband noise - maintains signal integrity in precision analog feedback networks without added filtering. |
Pinout & Package
SOT89 package: 3-pin surface-mount, thermally enhanced plastic case with exposed tab (pin 2) electrically connected to ANODE. Dimensions: 4.40 × 2.60 × 1.60 mm (max), 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Current Sink Output | Connects to SMPS controller COMP pin or optocoupler anode; sinks error current to adjust duty cycle. |
| Pin 2 (ANODE) | Ground Reference / Thermal Pad | Must be connected to PCB ground plane for thermal management and circuit reference; electrically tied to substrate. |
| Pin 3 (REF) | Precision Voltage Sense Input | High-impedance input (0.15–0.4 µA typical IREF) that samples resistor-divider output to regulate VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.24 V to 18 V set by two external resistors - eliminates need for multiple fixed-voltage references in multi-rail systems. |
| Capacitive Load Stability | Stable with ≥100 nF output capacitance - removes requirement for series damping resistor in compact PSU designs. |
| Low Temp Drift | ±4 mV max ΔVREF over full –40°C to +125°C range - enables single-part qualification across industrial and extended-temp applications. |
| Green & RoHS Compliance | Halogen- and antimony-free SOT89 package (G41B marking) - meets IPC-1752A material declaration and EU environmental directives. |
| High Sink Current Capacity | 100 mA continuous cathode current - supports direct drive of optocouplers and high-gain error amplifiers without external transistors. |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: Precision 12V/5V/3.3V VRM feedback loop on GPU power delivery subsystem. IC Role / Device Role / Timing Role: Shunt reference providing stable voltage setpoint to PWM controller error amplifier. Use Value: Enables ±1% output regulation under dynamic GPU load steps while maintaining thermal stability at 85°C board temperature. |
Use Scenario: Core voltage regulation for CPU VRM and memory termination supplies. IC Role / Device Role / Timing Role: Adjustable reference for multiphase buck converter feedback network. Use Value: Supports programmable VDDIO and VDDQ tracking with <10 mV total error across –40°C to +125°C ambient. |
| Voltage Adapters | Switching Power Supplies |
Use Scenario: Universal-input AC/DC adapter with multiple DC output rails (5V/9V/12V/15V). IC Role / Device Role / Timing Role: Programmable shunt reference in secondary-side feedback circuit. Use Value: Allows single BOM variant to support multiple output voltages via resistor change, reducing inventory SKUs. |
Use Scenario: Isolated flyback or forward converter in industrial power modules. IC Role / Device Role / Timing Role: Primary-side referenced shunt regulator driving optocoupler LED. Use Value: Delivers <0.5% line/load regulation with 0.05Ω output impedance, minimizing cross-regulation between outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 2.5% initial tolerance (vs. AZ431LBRTR-G1's 1.0%), higher 35 ppm/°C tempco, 0.2Ω ZKA | Acceptable in cost-sensitive consumer adapters where ±2% output tolerance is sufficient | Select when lower accuracy and higher impedance are acceptable to reduce BOM cost. |
| AS431ATR-E1 | 0.5% tolerance, but only rated to +85°C ambient (vs. +125°C), 0.08Ω ZKA, no Green/Halogen-free certification | Limited to commercial-grade PC peripherals and non-automotive embedded systems | Choose only for ambient ≤85°C applications where RoHS-only (non-Green) compliance suffices. |
Compared with TL431BIDBZR and AS431ATR-E1, AZ431LBRTR-G1 offers tighter 1.0% tolerance, superior thermal stability to +125°C, lower 0.05Ω dynamic impedance, and full halogen/antimony-free Green compliance - making it optimal for industrial and high-reliability power designs requiring long-term parametric consistency.
Availability
AZ431LBRTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and voltage adapters requiring stable component supply, consistent parametric performance across temperature, and full RoHS/Green compliance.
Supply support for AZ431LBRTR-G1 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, with design centers in Asia, Europe, and the U.S., and manufacturing in ISO/TS 16949-certified facilities.
The AZ431L series belongs to Diodes' precision reference product line, engineered specifically for high-stability shunt regulation in power conversion feedback paths where accuracy, thermal robustness, and long-term reliability are critical.
FAQ
What is the minimum cathode current required for regulation in AZ431LBRTR-G1?
The AZ431LBRTR-G1 requires a minimum cathode current (IKA(Min)) of 55 µA to maintain regulation at 25°C, rising to 80 µA across the full –40°C to +125°C range. This value is specified in the Electrical Characteristics table under "IKA (Min)" and must be met by the external bias network to ensure stable reference operation.
Can AZ431LBRTR-G1 replace TL431 in existing designs without layout changes?
Yes - AZ431LBRTR-G1 uses the same SOT89 pinout (CATHODE–ANODE–REF) and identical electrical interface as TL431 variants in SOT89. No PCB layout revision is needed, though the tighter 1.0% tolerance and lower dynamic impedance may improve regulation accuracy and transient response without circuit modification.
Is AZ431LBRTR-G1 qualified for automotive applications?
No - AZ431LBRTR-G1 is not AEC-Q100 qualified. While it operates from –40°C to +125°C and is RoHS/Green compliant, Diodes explicitly states that automotive-grade parts require separate qualification (PPAP, IATF 16949 manufacturing, AEC-Q100 stress testing), and this part is intended for industrial and commercial power applications only.
What does the "G1" suffix indicate in AZ431LBRTR-G1?
The "G1" suffix denotes Diodes' Green-compliant packaging: halogen- and antimony-free molding compound meeting <900 ppm Br, <900 ppm Cl (<1500 ppm Br+Cl), and <1000 ppm Sb limits. It also confirms RoHS 3 (2015/863/EU) compliance and is marked with "G41B" on the SOT89 body per Diodes' ordering information table.
AZ431LBRTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- Series:
- AZ431L
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AZ431LBRTR-G1 FAQ
1.How can I place an order for AZ431LBRTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LBRTR-G1 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 AZ431LBRTR-G1 reliable?
The price and inventory of AZ431LBRTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LBRTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ431LBRTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LBRTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LBRTR-G1?
AZ431LBRTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LBRTR-G1 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 AZ431LBRTR-G1?
For technical support, including AZ431LBRTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LBRTR-G1 requirements.
6.How does Aetrix verify that AZ431LBRTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ431LBRTR-G1 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 AZ431LBRTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ431LBRTR-G1?
All AZ431LBRTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LBRTR-G1, 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 AZ431LBRTR-G1 part is unused and in its original packaging.
Return procedure for AZ431LBRTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LBRTR-G1 Tags
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TL431AIDBZR
Texas Instruments
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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
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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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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