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Diodes Incorporated AZ431LAKTR-E1
- Part No.:
- AZ431LAKTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AZ431LAKTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,038
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Product details
Overview
AZ431LAKTR-E1 from Diodes Incorporated is a low-voltage (1.24 V nominal), adjustable precision shunt regulator in SOT25 package, featuring 0.5% initial reference voltage tolerance, 20 ppm/°C typical temperature coefficient, and 0.05 Ω typical dynamic output impedance. It operates from −40°C to +125°C and sinks 0.1 mA to 100 mA, serving as a zener diode replacement in feedback loops of switching power supplies and motherboard voltage regulation circuits.
For engineers reviewing the AZ431LAKTR-E1 datasheet, AZ431LAKTR-E1 pinout, AZ431LAKTR-E1 application, or AZ431LAKTR-E1 equivalent, this page delivers verified electrical parameters, validated SOT25 terminal mapping, real-world use cases in PC power delivery and charger feedback networks, and technically differentiated alternatives for design-in flexibility.
Technical Context
The AZ431LAKTR-E1 implements a bandgap-based reference core with sharp turn-on characteristics and low output impedance, enabling stable regulation under capacitive loads up to 100 µF without oscillation. Its three-terminal architecture (REF, ANODE, CATHODE) supports programmable output voltages from 1.24 V to 18 V using two external resistors.
It functions as a precision current sink in feedback paths, where cathode current varies linearly with error voltage across the reference pin. The device maintains <4 mV total reference voltage deviation over −40°C to +125°C and exhibits −0.5 to −1.5 mV/V cathode voltage sensitivity (ΔVREF/ΔVKA), critical for high-accuracy closed-loop control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.240 V ±0.5% at 10 mA - sets base accuracy for programmable output voltage calibration |
| Tempco | 20 ppm/°C typical - ensures ≤4 mV drift over full −40°C to +125°C operating range |
| Dynamic Impedance | 0.05 Ω typical at 1–100 mA - minimizes AC error injection into feedback node |
| Cathode Current Range | 0.1 mA to 100 mA - supports light-load standby and high-current regulation in SMPS |
| Operating Temperature | −40°C to +125°C - qualified for industrial and extended-temperature motherboard applications |
| Output Noise | Low - enables clean feedback signaling without added filtering in sensitive analog loops |
| Thermal Resistance (θJC) | 84.84 °C/W (SOT25) - defines junction-to-case heat transfer limit for thermal design |
Pinout & Package
AZ431LAKTR-E1 is housed in a RoHS-compliant, green SOT25 surface-mount package (3.10 mm × 1.70 mm × 1.45 mm), with matte tin-plated leads and moisture sensitivity level 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node sensing voltage divider output; regulates when voltage ≥1.24 V |
| Pin 2 (ANODE) | Anode Connection | Connected to system ground or low-side return path; forms current sink path with cathode |
| Pin 3 (CATHODE) | Cathode Output | Sinks regulated current to adjust feedback voltage; tied to optocoupler LED or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 1.24 V to 18 V via two external resistors - eliminates need for multiple fixed-voltage references |
| Capacitive Load Stability | Stable with ≥100 µF output capacitance - avoids compensation network redesign in high-C filter applications |
| Low Reference Current | 0.15 µA typical at 25°C - reduces divider resistor power loss and improves light-load efficiency |
| Sharp Turn-On Characteristic | Fast regulation onset at VREF threshold - enables precise overvoltage detection and fast loop response |
| Low Tempco Drift | ≤4 mV total deviation over −40°C to +125°C - ensures consistent setpoint accuracy across environmental stress |
Applications
| PC Motherboard VRM Feedback | USB-C Charger Secondary-Side Regulation |
|---|---|
|
Use Scenario: Regulates 12 V/5 V/3.3 V rail outputs on ATX-compliant motherboards using optocoupler-coupled feedback to PWM controller. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5 V feedback voltage to isolated error amplifier. Use Value: Maintains ±1% output voltage accuracy across temperature and load transients without external trimming. |
Use Scenario: Sets secondary-side output voltage in 20–65 W USB PD chargers with flyback topology and digital controller. IC Role / Device Role / Timing Role: Adjustable reference feeding TL431-compatible optocoupler driver for isolated voltage sensing. Use Value: Enables single-BOM support for multiple output voltages (9 V/15 V/20 V) via resistor selection. |
| Industrial DC-DC Converter Trim | Graphic Card GPU Core Voltage Monitor |
|
Use Scenario: Fine-tunes output of wide-input industrial DC-DC modules (4.5–36 V input) for FPGA or microcontroller supply rails. IC Role / Device Role / Timing Role: Programmable shunt element in adjustable feedback divider network. Use Value: Achieves 0.5% setpoint accuracy while tolerating >100 kHz ripple on cathode node. |
Use Scenario: Monitors and stabilizes GPU core voltage (0.8–1.2 V) in PCIe graphics cards using multi-phase buck regulators. IC Role / Device Role / Timing Role: High-stability reference for remote sense amplifier and VID decoding circuitry. Use Value: Delivers <3 mV temperature-induced drift, ensuring voltage margin compliance during thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495 V nominal reference, ±0.5% tolerance, higher 0.2 Ω dynamic impedance | Requires different resistor scaling for same output voltage; less suitable for sub-2.5 V designs | Select when legacy TL431 footprint compatibility is required and 2.5 V reference suffices |
| AS431ASTZTR-G1 | 1.24 V reference, ±0.5%, but rated only to +85°C ambient and 50 mA max cathode current | Limited to commercial-grade applications; not qualified for extended-temperature industrial use | Choose only for cost-sensitive consumer designs with relaxed thermal and current requirements |
Compared with TL431ACDBVR and AS431ASTZTR-G1, AZ431LAKTR-E1 uniquely combines 1.24 V low-voltage operation, −40°C to +125°C rating, and 100 mA sink capability in a compact SOT25 package-making it optimal for space-constrained, high-reliability power management where precision and thermal robustness are critical.
Availability
AZ431LAKTR-E1 is available at Aetrix Electronics and suitable for PC motherboard VRM feedback, USB-C charger secondary regulation, and industrial DC-DC converter trim requiring stable component supply, long-term lifecycle assurance, and RoHS/Green compliance.
Supply support for AZ431LAKTR-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 high-performance, energy-efficient components for power management, signal integrity, and protection.
AZ431LAKTR-E1 belongs to Diodes' precision shunt regulator product line, engineered specifically for high-accuracy, low-drift voltage reference needs in switching power supplies, battery chargers, and computing infrastructure.
FAQ
What is the minimum cathode current required for regulation in AZ431LAKTR-E1?
The AZ431LAKTR-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 IKA(Min) and must be met by the external bias network to ensure stable reference operation.
Can AZ431LAKTR-E1 replace a standard Zener diode directly in existing designs?
Yes-AZ431LAKTR-E1 can directly replace Zener diodes in feedback or reference circuits due to its identical three-terminal configuration (REF/ANODE/CATHODE), sharp turn-on, and low dynamic impedance. However, external resistor values must be recalculated to target the desired output voltage using VOUT = VREF × (1 + R1/R2), where VREF = 1.24 V.
Does AZ431LAKTR-E1 require an external capacitor for stability?
No external capacitor is required for basic regulation stability. The AZ431LAKTR-E1 remains stable with capacitive loads up to 100 µF, as confirmed in the Performance Characteristics section. However, a small ceramic capacitor (e.g., 100 nF) across REF–ANODE is recommended in noisy environments to suppress high-frequency interference on the reference node.
What is the meaning of "E1" in the part number AZ431LAKTR-E1?
"E1" denotes Diodes Incorporated's RoHS-compliant, lead-free packaging standard-fully compliant with EU Directive 2015/863/EU (RoHS 3). It confirms the device uses matte tin-plated leads, contains no purposely added lead, and meets halogen- and antimony-free "Green" requirements (<900 ppm Br/Cl, <1000 ppm Sb).
AZ431LAKTR-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±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-23-5
AZ431LAKTR-E1 FAQ
1.How can I place an order for AZ431LAKTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LAKTR-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 AZ431LAKTR-E1 reliable?
The price and inventory of AZ431LAKTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LAKTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ431LAKTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LAKTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LAKTR-E1?
AZ431LAKTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LAKTR-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 AZ431LAKTR-E1?
For technical support, including AZ431LAKTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LAKTR-E1 requirements.
6.How does Aetrix verify that AZ431LAKTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ431LAKTR-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 AZ431LAKTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ431LAKTR-E1?
All AZ431LAKTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LAKTR-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 AZ431LAKTR-E1 part is unused and in its original packaging.
Return procedure for AZ431LAKTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LAKTR-E1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
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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
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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