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Diodes Incorporated AZ431LANTR-E1
- Part No.:
- AZ431LANTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431LANTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:32,833
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Product details
Overview
AZ431LANTR-E1 from Diodes Incorporated is a low-voltage (1.24 V nominal), 0.5% tolerance, adjustable precision shunt regulator in SOT23 package, designed to replace Zener diodes in feedback loops of switching power supplies, PC motherboards, and chargers. It delivers stable reference voltage from 1.24 V to 18 V via two external resistors, supports sink current from 0.1 mA to 100 mA, and operates across –40°C to +125°C.
For engineers reviewing the AZ431LANTR-E1 datasheet, AZ431LANTR-E1 pinout, AZ431LANTR-E1 application, or AZ431LANTR-E1 equivalent, this page provides verified electrical parameters, thermal performance data, package-specific layout guidance, and validated alternative options for voltage reference design-in.
Technical Context
The AZ431LANTR-E1 functions as a three-terminal adjustable shunt reference with internal bandgap core, delivering precise 1.24 V reference voltage with ±0.5% initial tolerance and 20 ppm/°C typical temperature coefficient. Its sharp turn-on and low dynamic output impedance (0.05 Ω typical) enable stable regulation under capacitive loads up to 100 µF without oscillation.
It operates over cathode voltage range VKA = VREF to 18 V, with minimum cathode current of 55 µA for regulation and off-state leakage below 0.1 µA at 18 V. The device is rated for 370 mW power dissipation in SOT23 and features RoHS-compliant, lead-free matte tin plating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (Typical) | 1.240 V - stable bandgap-derived reference voltage at 25°C, 10 mA cathode current |
| Voltage Tolerance | ±0.5% - ensures tight output setting accuracy for high-precision feedback networks |
| Temp Coefficient | 20 ppm/°C typical - minimal drift over –40°C to +125°C, critical for industrial ambient stability |
| ZKA (Dynamic Impedance) | 0.05 Ω typical - enables fast transient response and low noise in closed-loop regulation |
| IK(A) Range | 0.1 mA to 100 mA - supports wide-range current sinking for diverse load and compensation topologies |
| Operating Temp | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments |
| Power Dissipation | 370 mW (SOT23) - defines maximum continuous thermal budget before derating required |
Pinout & Package
AZ431LANTR-E1 is packaged in RoHS-compliant, lead-free SOT23 (TO-236AB) with 3-pin configuration and matte tin-plated leads. Package dimensions: 2.90 × 1.30 × 1.00 mm (L × W × H); weight ≈ 0.009 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode terminal | Connected to system ground or low-side return path; forms current sink path with cathode |
| Pin 2 (Cathode) | Cathode terminal | High-side connection point; sinks regulated current into feedback node or error amplifier input |
| Pin 3 (Ref) | Reference input | Senses divided output voltage; sets regulation threshold via external resistor divider (R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.24 V to 18 V - set by external R1/R2 ratio, enabling single BOM part across multiple output rails |
| Capacitive Load Stability | Stable with ≥100 µF - eliminates need for series damping resistors in high-capacitance SMPS outputs |
| Low Temp Drift | 4 mV max deviation over –40°C to +125°C - reduces calibration burden in wide-temperature systems |
| Low IREF | 0.15 µA typical - minimizes divider current loss and improves light-load efficiency |
| High Sink Current | 100 mA max - supports direct drive of optocoupler LEDs or error amplifier inputs without buffering |
Applications
| PC Motherboard VRM Feedback | USB-C PD Charger Reference |
|---|---|
|
Use Scenario: Precision voltage sensing in multi-phase CPU/GPU VRMs with dynamic load steps. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.24 V threshold for error amplifier comparison in feedback loop. Use Value: 0.5% tolerance and 20 ppm/°C TC ensure <±5 mV output deviation across full thermal range, maintaining SoC voltage compliance. |
Use Scenario: Secondary-side voltage regulation in isolated 20–100 W USB-C PD adapters. IC Role / Device Role / Timing Role: Adjustable reference driving optocoupler LED to close isolation barrier feedback loop. Use Value: 100 mA sink capability directly drives common optocouplers (e.g., PC817, LTV-817) without external transistor, reducing BOM count. |
| Industrial DC-DC Converter | Graphic Card Power Rail Monitor |
|
Use Scenario: Programmable 5 V/12 V/15 V output regulation in DIN-rail mounted 24 V input converters. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting output voltage via potentiometer-adjusted R1/R2 network. Use Value: Wide 1.24–18 V programming range allows one reference IC to support multiple output configurations on same PCB. |
Use Scenario: GPU core voltage (VDDC) monitoring and fine-tuning in PCIe-based graphics cards. IC Role / Device Role / Timing Role: High-stability reference feeding ADC input or digital controller for closed-loop VDDC trimming. Use Value: Low 0.05 Ω dynamic impedance ensures minimal noise coupling into sensitive analog monitor paths, preserving ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDBVR | 0.5% tolerance, 30 ppm/°C TC, 1.24 V ref, SOT23 - higher temp coefficient than AZ431LANTR-E1 | Lower thermal stability limits use in >85°C ambient without derating; requires tighter layout for noise immunity | Preferred where TI ecosystem compatibility or SPICE model availability is prioritized over ultra-low drift |
| AS431ASTZTR-G1 | 0.5% tolerance, 20 ppm/°C TC, 1.24 V ref, SOT23 - identical spec envelope but different manufacturer qualification flow | No AEC-Q200 stress screening; not recommended for automotive-grade designs requiring PPAP documentation | Valid drop-in for industrial/commercial boards where Diodes' IATF 16949 manufacturing traceability is not required |
Compared with TLV431BIDBVR and AS431ASTZTR-G1, AZ431LANTR-E1 offers superior thermal stability (20 ppm/°C vs. 30 ppm/°C) and full industrial temperature validation (–40°C to +125°C), making it optimal for high-reliability embedded power systems where long-term reference drift must be minimized.
Availability
AZ431LANTR-E1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and USB-C charger designs requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for AZ431LANTR-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design and manufacturing facilities certified to IATF 16949 and ISO 9001 standards.
AZ431LANTR-E1 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy voltage reference in power management feedback circuits across computing, consumer, and industrial applications.
FAQ
What is the minimum cathode current required for regulation in AZ431LANTR-E1?
The AZ431LANTR-E1 requires a minimum cathode current of 55 µA (typical) to maintain regulation at 25°C, rising to 80 µA maximum across –40°C to +125°C. This value is specified in the Electrical Characteristics table under IK(A)(Min) and determines the upper bound of the feedback resistor divider's total resistance to ensure reliable startup and steady-state operation.
Can AZ431LANTR-E1 replace a standard Zener diode in existing designs?
Yes - AZ431LANTR-E1 is explicitly designed as a Zener diode replacement, offering superior voltage accuracy (±0.5% vs. ±5% typical for Zeners), lower temperature drift (20 ppm/°C vs. 5000 ppm/°C), and programmable output (1.24–18 V). No circuit topology change is needed beyond replacing the Zener with the 3-pin AZ431L and adding two external resistors for voltage setting.
Is AZ431LANTR-E1 qualified for automotive applications?
AZ431LANTR-E1 is not AEC-Q100 qualified and is marked NRND (Not Recommended for New Design) per Diodes' ordering information. While it operates across –40°C to +125°C, it lacks automotive-specific stress testing, PPAP documentation, and IATF 16949 traceability for safety-critical vehicle subsystems. For automotive use, Diodes recommends contacting their sales team for AEC-Q100-qualified alternatives.
What is the thermal resistance (θJA) of AZ431LANTR-E1 in SOT23 package?
The datasheet specifies θJC = 84.84 °C/W for SOT23, but does not publish θJA. Typical θJA for SOT23 on 1-in² 2-layer board with 1 oz copper is ~200–250 °C/W. For thermal design, users must calculate junction temperature using PD = IK × VK, apply derating above 25°C ambient, and verify against the 150°C max junction rating - especially at >50 mA sink current.
AZ431LANTR-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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- 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
AZ431LANTR-E1 FAQ
1.How can I place an order for AZ431LANTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LANTR-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 AZ431LANTR-E1 reliable?
The price and inventory of AZ431LANTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LANTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ431LANTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LANTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LANTR-E1?
AZ431LANTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LANTR-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 AZ431LANTR-E1?
For technical support, including AZ431LANTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LANTR-E1 requirements.
6.How does Aetrix verify that AZ431LANTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ431LANTR-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 AZ431LANTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ431LANTR-E1?
All AZ431LANTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LANTR-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 AZ431LANTR-E1 part is unused and in its original packaging.
Return procedure for AZ431LANTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LANTR-E1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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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
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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