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Diodes Incorporated AZ431LBNTR-G1
- Part No.:
- AZ431LBNTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431LBNTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:61,150
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Product details
Overview
AZ431LBNTR-G1 from Diodes Incorporated is a 1.0% tolerance, low-voltage (1.24 V nominal) adjustable precision shunt regulator in SOT23 package, designed for voltage reference and feedback regulation in switching power supplies, PC motherboards, and chargers. It delivers stable 1.24 V reference with ±1.2 mV typical deviation over –40°C to +125°C, 0.05 Ω dynamic impedance, and supports sink current from 0.1 mA to 100 mA.
For engineers reviewing the AZ431LBNTR-G1 datasheet, AZ431LBNTR-G1 pinout, AZ431LBNTR-G1 application, or AZ431LBNTR-G1 equivalent, this page provides verified electrical parameters, thermal performance data, SOT23 pin mapping, real-world use cases in voltage adapters and PWM converters, and validated alternative parts for design flexibility.
Technical Context
The AZ431LBNTR-G1 operates as a three-terminal programmable shunt reference, using an internal bandgap circuit to generate a precise 1.24 V reference at the REF pin. Its cathode-anode path behaves like a controllable current sink whose conduction threshold is set by external resistor dividers.
It features sharp turn-on characteristics and maintains regulation across 1.24 V–18 V output range with ≤20 ppm/°C temperature coefficient and high stability under capacitive loads up to 10 µF. The device remains functional from –40°C to +125°C ambient and exhibits <0.1 µA off-state cathode leakage at 18 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.240 V ±1.2 mV (1.0% tolerance; sets accurate feedback point for closed-loop regulation) |
| Temperature Coefficient | 20 ppm/°C typical (ensures <±2 mV drift over full –40°C to +125°C range) |
| Dynamic Impedance (ZKA) | 0.05 Ω typical (minimizes output voltage variation under load transients) |
| Cathode Current Range | 0.1 mA to 100 mA (supports wide-range feedback loop biasing and error amplifier drive) |
| Operating Temperature | –40°C to +125°C (enables use in industrial and automotive-adjacent power systems) |
| Thermal Resistance (θJC) | 84.84 °C/W (SOT23 package; defines junction-to-case heat dissipation limit) |
| Max Cathode Voltage (VKA) | 20 V absolute maximum (sets safe operating voltage headroom for 18 V regulated outputs) |
Pinout & Package
SOT23 package: 3-pin, surface-mount, lead-free and RoHS-compliant "Green" molding compound; 2.3 mm × 1.2 mm footprint; 0.95 mm pitch; 0.009 g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Current Sink Output | Connects to switched node or feedback divider top; sinks regulated current to maintain VREF |
| Pin 2 (Anode) | Current Return Path | Connected to system ground or low-side return; completes shunt current path |
| Pin 3 (REF) | Reference Input | High-impedance (0.15 µA typical IREF) node that senses divided output voltage; sets regulation threshold |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.24 V to 18 V via two external resistors - enables single BOM part across multiple output rails |
| Low Dynamic Output Resistance | 0.05 Ω typical - suppresses ripple and improves transient response in feedback loops |
| Capacitive Load Stability | Stable with ≥10 µF ceramic output capacitance - eliminates need for series damping resistors |
| Wide Operating Temperature | –40°C to +125°C - qualified for industrial-grade motherboard and charger environments |
| Low Reference Current | 0.15 µA typical IREF - reduces divider power loss and improves accuracy at high-resistance settings |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: Providing precise 1.2 V GPU core voltage reference in multi-phase VRMs. IC Role / Device Role / Timing Role: Shunt reference for error amplifier input in synchronous buck controller feedback network. Use Value: 20 ppm/°C tempco ensures <±3 mV reference drift across GPU thermal cycling, maintaining voltage accuracy under load. |
Use Scenario: Generating stable 3.3 V and 5 V standby rail references on ATX power delivery circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting feedback point for secondary-side DC-DC converters. Use Value: 0.05 Ω dynamic impedance minimizes output perturbation during CPU sleep/wake transitions. |
| Voltage Adapters | Switching Power Supplies |
Use Scenario: Enabling compact 12 V to 5 V USB-C PD adapter designs with tight output tolerance. IC Role / Device Role / Timing Role: Precision reference for optocoupler-coupled feedback in isolated flyback controllers. Use Value: 1.0% initial tolerance and low tempco meet USB PD v3.1 ±5% output spec without trimming. |
Use Scenario: Regulating auxiliary 15 V bias supply in industrial AC-DC front-end converters. IC Role / Device Role / Timing Role: Programmable shunt reference defining upper threshold of TL431-compatible feedback loop. Use Value: 100 mA sink capability supports direct drive of optocoupler LED without external transistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | 2.495 V nominal reference; 0.5% tolerance; higher VREF, lower tempco (50 ppm/°C), SOT23-3 | Requires redesign of resistor divider for 2.495 V base; better for >3 V outputs but less flexible below 2 V | Select when higher reference voltage improves noise immunity or matches legacy TL431-based designs |
| AS431ASTZTR-G1 | 1.24 V nominal; 1.0% tolerance; identical SOT23-3 pinout; 0.1 µA max IREF; 0.1 Ω ZKA | Same functional replacement; slightly higher dynamic impedance impacts high-frequency ripple rejection | Use for drop-in qualification where Diodes' AZ431LBNTR-G1 is unavailable; verify loop stability with 0.1 Ω ZKA |
Compared with TL431BIDBVR and AS431ASTZTR-G1, AZ431LBNTR-G1 offers optimal trade-off for sub-3 V regulation: lowest VREF (1.24 V), tightest low-voltage accuracy, and lowest dynamic impedance - critical for modern low-voltage, high-efficiency SMPS designs.
Availability
AZ431LBNTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and voltage adapters requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AZ431LBNTR-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AZ431L series belongs to Diodes' precision reference product line, engineered specifically for cost-sensitive, space-constrained power supply feedback applications demanding low-voltage operation and robust thermal performance.
FAQ
What is the minimum cathode current required for regulation in AZ431LBNTR-G1?
The AZ431LBNTR-G1 requires a minimum cathode current of 55 µA (typical) to maintain regulation, as specified in the Electrical Characteristics table under IKA(Min). This value ensures stable reference voltage generation even at light loads, enabling reliable operation in low-power standby circuits.
Can AZ431LBNTR-G1 replace TL431 in existing designs?
Yes, but only with resistor divider recalibration: AZ431LBNTR-G1 has 1.24 V reference versus TL431's 2.495 V, requiring ~2× reduction in upper divider resistor value. Pinout is identical in SOT23, but thermal and dynamic impedance differences must be validated in the target application.
Is AZ431LBNTR-G1 qualified for automotive applications?
No - AZ431LBNTR-G1 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AZ431LxxTR-A) with PPAP support and IATF 16949 manufacturing; this part is rated for industrial temperature range (–40°C to +125°C) but lacks automotive change control or stress testing certification.
What is the maximum power dissipation for AZ431LBNTR-G1 in SOT23 package?
The maximum continuous power dissipation for AZ431LBNTR-G1 in SOT23 is 370 mW at TA = 25°C, as stated in Absolute Maximum Ratings. Derating is required above 25°C per the θJA = 220°C/W thermal characteristic; junction temperature must remain ≤+150°C under all operating conditions.
AZ431LBNTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
AZ431LBNTR-G1 FAQ
1.How can I place an order for AZ431LBNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LBNTR-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 AZ431LBNTR-G1 reliable?
The price and inventory of AZ431LBNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LBNTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ431LBNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LBNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LBNTR-G1?
AZ431LBNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LBNTR-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 AZ431LBNTR-G1?
For technical support, including AZ431LBNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LBNTR-G1 requirements.
6.How does Aetrix verify that AZ431LBNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ431LBNTR-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 AZ431LBNTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ431LBNTR-G1?
All AZ431LBNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LBNTR-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 AZ431LBNTR-G1 part is unused and in its original packaging.
Return procedure for AZ431LBNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LBNTR-G1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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