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Diodes Incorporated AZ431LBNTR-E1
- Part No.:
- AZ431LBNTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431LBNTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,318
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Product details
Overview
AZ431LBNTR-E1 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 control in switching power supplies, PC motherboards, and chargers. It delivers stable regulation from 1.24 V to 18 V using two external resistors, features 0.05 Ω typical dynamic impedance, operates across –40°C to +125°C, and supports cathode current up to 100 mA.
For engineers reviewing the AZ431LBNTR-E1 datasheet, AZ431LBNTR-E1 pinout, AZ431LBNTR-E1 application, or AZ431LBNTR-E1 equivalent, this page provides verified electrical parameters, thermal performance data, package-specific layout guidance, and validated alternative options for feedback loop design and BOM optimization in high-reliability power systems.
Technical Context
The AZ431LBNTR-E1 implements a bandgap-based precision reference core with sharp turn-on characteristics and low temperature coefficient (20 ppm/°C typical), enabling accurate voltage setting without external trimming. Its internal architecture ensures stable operation under capacitive loads up to 100 nF while maintaining low output noise and minimal drift over temperature.
It functions as a programmable shunt regulator where the REF pin senses the divided output voltage, ANODE connects to system ground or return path, and CATHODE sinks current into the error amplifier of a PWM controller. The device's low 0.15 µA typical reference input current minimizes divider network loading errors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.240 V ±1.0% (guaranteed at 10 mA cathode current; sets minimum programmable output) |
| Output Voltage Range | 1.24 V to 18 V (programmable via external resistor divider; enables flexible feedback scaling) |
| Dynamic Impedance | 0.05 Ω typical (ensures minimal AC voltage deviation during load transients in closed-loop systems) |
| Cathode Current Range | 0.1 mA to 100 mA (supports wide-range sink capability for diverse controller interface requirements) |
| Temperature Coefficient | 20 ppm/°C typical (limits reference drift to ≤2.5 mV over –40°C to +125°C ambient) |
| Operating Temperature | –40°C to +125°C (qualified for industrial and extended-temperature motherboard and adapter applications) |
| Thermal Resistance (θJC) | 84.84 °C/W (SOT23 package; informs heatsinking needs for >370 mW power dissipation scenarios) |
Pinout & Package
AZ431LBNTR-E1 is supplied in RoHS-compliant, lead-free SOT23 package (3-pin, surface-mount). Pin 1 = REF (reference input), Pin 2 = ANODE (ground connection), Pin 3 = CATHODE (current-sink output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | Senses divided output voltage; high-impedance node (0.15 µA typical input current) requiring minimal divider loading |
| Pin 2 (ANODE) | Ground Reference | Connected to system ground or return path; internally tied to substrate; must not be left floating |
| Pin 3 (CATHODE) | Current Sink Output | Drives error amplifier input or optocoupler LED; sinks up to 100 mA; voltage headroom ≥1.24 V required |
Key Features
| Feature | Design Value |
|---|---|
| Programmable reference range | 1.24 V to 18 V - enables single-part support for 3.3 V, 5 V, 12 V, and custom rail designs |
| Low dynamic output resistance | 0.05 Ω typical - maintains tight regulation during fast load steps in SMPS feedback paths |
| Capacitive load stability | Stable with ≥100 nF output capacitance - eliminates need for external compensation in most adapter designs |
| Wide operating temperature range | –40°C to +125°C - qualified for under-hood automotive adapters and industrial power modules |
| Low reference input current | 0.15 µA typical - reduces power loss and voltage error in high-resistance feedback dividers |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
|
Use Scenario: Precision 1.2 V GPU core voltage regulation using isolated flyback converter with optocoupler feedback. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V feedback threshold to optocoupler LED driver. Use Value: Enables ±1% output accuracy across –25°C to +85°C GPU junction temperature swing without calibration. |
Use Scenario: Multi-rail VRM monitoring and sequencing on ATX mainboard with dual 12 V/5 V/3.3 V outputs. IC Role / Device Role / Timing Role: Independent reference for each rail's overvoltage protection comparator and PMBus margining circuit. Use Value: Guarantees <±10 mV reference drift over full board thermal profile, ensuring reliable fault detection. |
| Voltage Adapters | Switching Power Supplies |
|
Use Scenario: Universal-input 12 V/2 A wall adapter with primary-side sensing and secondary-side shunt regulation. IC Role / Device Role / Timing Role: Secondary-side voltage reference feeding TL431-compatible optocoupler feedback loop. Use Value: Achieves <±1.5% line/load regulation across 90–264 VAC input and 0–100% load, meeting Level VI efficiency specs. |
Use Scenario: 48 V input, 5 V/10 A telecom DC-DC module with synchronous buck topology and remote sense. IC Role / Device Role / Timing Role: Precision shunt reference for remote-sense amplifier biasing and output voltage trimming. Use Value: Maintains ±0.5% output accuracy at point-of-load despite 50 mΩ PCB trace resistance between regulator and connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | 2.495 V fixed reference; higher 0.2 Ω dynamic impedance; 1% tolerance; SOT23-3 | Requires resistor divider to scale below 2.495 V; less suitable for sub-2 V rails | Select when fixed 2.5 V reference suffices and legacy TL431 footprint compatibility is required |
| AS431ASTZTR-G1 | 1.24 V adjustable; 0.5% tolerance; same SOT23 package; 0.03 Ω dynamic impedance | Higher precision and lower impedance, but tighter tolerance increases cost and may over-specify non-critical rails | Select for applications demanding <±0.62 mV reference error over temperature, e.g., metrology-grade power modules |
Compared with TL431BIDBVR, AZ431LBNTR-E1 offers lower minimum reference voltage and superior dynamic impedance for modern low-voltage rails; compared with AS431ASTZTR-G1, it trades 0.5% tolerance for cost-sensitive designs where ±12.4 mV total error remains within system margin.
Availability
AZ431LBNTR-E1 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-E1 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 solutions for industrial, computing, and consumer markets.
AZ431LBNTR-E1 belongs to Diodes' precision shunt regulator product line, engineered specifically for high-accuracy, low-drift voltage reference in compact, thermally constrained power conversion systems.
FAQ
What is the minimum cathode current required for regulation in AZ431LBNTR-E1?
The AZ431LBNTR-E1 requires a minimum cathode current of 55 µA (typical) to maintain regulation, as specified in its Electrical Characteristics table. This value ensures stable reference operation even under light-load conditions typical in standby or low-power modes of switching regulators. Operation below this threshold may result in reference voltage deviation exceeding tolerance limits.
Can AZ431LBNTR-E1 replace a standard Zener diode in existing designs?
Yes - AZ431LBNTR-E1 can directly replace Zener diodes in feedback networks due to its three-terminal configuration, sharp turn-on, and programmable output. Unlike Zeners, it offers guaranteed thermal stability, lower temperature coefficient (20 ppm/°C vs. 5000 ppm/°C for typical Zeners), and precise 1.24 V base reference, eliminating calibration during manufacturing.
Is AZ431LBNTR-E1 qualified for automotive applications?
AZ431LBNTR-E1 itself is not AEC-Q100 qualified; however, Diodes offers automotive-grade variants (e.g., AZ431LAXTR-G1) with PPAP documentation and IATF 16949 manufacturing. For non-automotive industrial use, its –40°C to +125°C operating range and RoHS/Green compliance meet extended-temperature requirements in automotive-adjacent systems like infotainment power supplies.
How does the SOT23 package affect thermal performance in high-current operation?
In SOT23, AZ431LBNTR-E1 has a junction-to-case thermal resistance of 84.84 °C/W and a maximum power dissipation of 370 mW. At 100 mA cathode current and 5 V cathode-anode differential, power dissipation reaches 500 mW - exceeding rating. Designers must limit VKA × IKA product or add copper pour to reduce effective θJA, ensuring TJ stays below 150°C under worst-case ambient.
AZ431LBNTR-E1 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:
- Obsolete
- 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-E1 FAQ
1.How can I place an order for AZ431LBNTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LBNTR-E1 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-E1 reliable?
The price and inventory of AZ431LBNTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LBNTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ431LBNTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LBNTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LBNTR-E1?
AZ431LBNTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LBNTR-E1 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-E1?
For technical support, including AZ431LBNTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LBNTR-E1 requirements.
6.How does Aetrix verify that AZ431LBNTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ431LBNTR-E1 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-E1 meets industry standards.
7.What is the process for return or replacement of AZ431LBNTR-E1?
All AZ431LBNTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LBNTR-E1, 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-E1 part is unused and in its original packaging.
Return procedure for AZ431LBNTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LBNTR-E1 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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