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Diodes Incorporated AZ431LARTR-G1
- Part No.:
- AZ431LARTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AZ431LARTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,066
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Product details
Overview
AZ431LARTR-G1 from Diodes Incorporated is a low-voltage (1.24 V nominal), adjustable precision shunt regulator in SOT89 package, featuring 0.5% initial 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 0.1–100 mA cathode current, serving as a high-stability replacement for Zener diodes in feedback loops of switching power supplies and motherboard VRMs.
For engineers reviewing the AZ431LARTR-G1 datasheet, AZ431LARTR-G1 pinout, AZ431LARTR-G1 application, or AZ431LARTR-G1 equivalent, this page delivers verified electrical parameters, validated SOT89 pin configuration, real-world use cases in PC power delivery and charger regulation, and confirmed alternative parts with documented functional differences.
Technical Context
The AZ431LARTR-G1 implements a bandgap-based reference core with internal error amplifier and output stage, enabling precise 1.24–18 V programmable output via two external resistors. Its sharp turn-on characteristic and low 3 mV typical temperature deviation ensure stable regulation across automotive and industrial ambient ranges.
It functions as a three-terminal shunt device: REF senses the reference node, ANODE connects to system ground or return path, and CATHODE sinks current into the regulated rail. The device maintains stability under capacitive loads up to 100 µF and exhibits <0.1 µA off-state cathode leakage at 18 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.240 V ±0.5% - sets base accuracy for feedback loop calibration |
| Tempco | 20 ppm/°C typical - ensures ≤4 mV drift over -40°C to +125°C |
| Dynamic Impedance | 0.05 Ω typical - minimizes output voltage perturbation during load transients |
| Cathode Current Range | 0.1–100 mA - supports wide-range sink capability for diverse feedback networks |
| Operating Temp | -40°C to +125°C - qualified for under-hood and industrial PCB environments |
| Thermal Resistance (θJC) | 29.8 °C/W - enables 770 mW power dissipation in SOT89 package |
| Output Noise | Low - critical for low-noise voltage monitoring without added filtering |
Pinout & Package
SOT89 package: 3-pin surface-mount, thermally enhanced plastic case with exposed thermal pad (pin 2 connected to substrate). Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. Pin 2 must be connected to system ground or left open per design requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | Senses divider network midpoint; high-impedance input (0.15 µA typical IREF) |
| 2 (ANODE) | Anode Terminal | Internally tied to substrate; must connect to ground or remain floating per layout guidelines |
| 3 (CATHODE) | Cathode Output | Sinks regulated current into feedback node; handles up to 100 mA continuous |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Range | 1.24 V to 18 V - set by external resistor ratio, no internal trimming required |
| Capacitive Load Stability | Stable with ≥100 µF - eliminates need for series damping resistors in bulk-capacitor applications |
| Low Temp Deviation | 3 mV typical over full range - reduces calibration overhead in temperature-critical systems |
| Lead-Free & Green | RoHS 3 compliant, halogen/antimony-free - meets IPC-1752A environmental compliance requirements |
| High Sink Current Capacity | 100 mA max - supports high-gain optocoupler drivers in isolated SMPS feedback paths |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: Voltage margining and GPU core rail feedback in PCIe-based graphics cards. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler-coupled secondary-side regulation loop. Use Value: Enables ±1% output voltage accuracy across -25°C to +85°C GPU junction range using only two resistors. | Use Scenario: 12 V → 1.0 V VRM feedback sensing on ATX motherboard power planes. IC Role / Device Role / Timing Role: Adjustable reference for multiphase buck controller error amplifiers. Use Value: Maintains 0.5% reference stability despite 40°C PCB temperature gradients near CPU socket. |
| Voltage Adapters | Chargers |
Use Scenario: Universal AC/DC adapter output regulation (5 V/9 V/12 V selectable via DIP switch). IC Role / Device Role / Timing Role: Programmable shunt element in TL431-replacement feedback network. Use Value: Achieves <10 mV load regulation error across 0–2 A output with single-component reconfiguration. | Use Scenario: USB PD fast-charging brick output voltage control (9 V/15 V/20 V profiles). IC Role / Device Role / Timing Role: High-accuracy reference for digital DAC-controlled flyback feedback. Use Value: Delivers 0.5% factory-set voltage accuracy without post-production trimming, reducing test time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.495 V nominal reference, ±1% tolerance, higher 0.2 Ω dynamic impedance | Requires different resistor scaling; less suitable for sub-3 V rails | Select when legacy 2.5 V reference compatibility is mandatory and tempco <50 ppm/°C suffices |
| AS431ASTRT | 1.24 V reference, ±0.5%, but rated only to +85°C ambient and 50 mA max cathode current | Limited thermal headroom in high-power adapters or automotive under-hood use | Choose for cost-sensitive consumer-grade chargers where extended temperature operation is not required |
Compared with TL431ACDR and AS431ASTRT, the AZ431LARTR-G1 provides superior low-voltage programmability, tighter tolerance, wider temperature range, and higher current capability-making it optimal for next-generation compact, high-efficiency power supplies demanding 1.24 V baseline accuracy.
Availability
AZ431LARTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and USB PD chargers requiring stable component supply, RoHS 3 compliance, and production-ready tape-and-reel packaging (1000 pcs/reel).
Supply support for AZ431LARTR-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in certified ISO/TS 16949 facilities.
The AZ431L series belongs to Diodes' precision reference product line, engineered specifically for high-accuracy, low-drift shunt regulation in space-constrained power management systems where Zener diodes fall short in stability and programmability.
FAQ
What is the minimum cathode current required for regulation in AZ431LARTR-G1?
The AZ431LARTR-G1 requires a minimum cathode current of 55 µA (typical) to maintain regulation, as specified in the Electrical Characteristics table under IKA(Min). This low threshold enables reliable startup and stable operation even with high-value feedback resistors or low-power optocouplers in isolated topologies.
Can AZ431LARTR-G1 replace TL431 in existing designs without circuit modification?
No direct drop-in replacement is possible due to differing reference voltages: AZ431LARTR-G1 uses 1.24 V while TL431 uses 2.495 V. Resistor values in the feedback divider must be recalculated to achieve the same output voltage, and thermal layout should be reviewed since SOT89 offers lower θJC than common TL431 packages like TO92.
Does AZ431LARTR-G1 require an external capacitor for stability?
No external capacitor is required for basic stability-the AZ431LARTR-G1 remains stable with capacitive loads up to 100 µF per the datasheet's "Stable" region in the Cathode Current vs. Load Capacitance plot. However, a 1 nF ceramic capacitor between REF and ANODE is recommended in noisy environments to suppress high-frequency coupling.
What does the 'G1' suffix indicate in AZ431LARTR-G1?
The 'G1' suffix denotes Diodes Incorporated's Green-compliant packaging: fully RoHS 3 compliant (2015/863/EU), halogen-free (<900 ppm Br/Cl, <1000 ppm Sb), and antimony-free. It confirms the SOT89 package uses environmentally optimized molding compound and matte tin-plated leads meeting MIL-STD-202 solderability standards.
AZ431LARTR-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:
- ±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-89-3
AZ431LARTR-G1 FAQ
1.How can I place an order for AZ431LARTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LARTR-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 AZ431LARTR-G1 reliable?
The price and inventory of AZ431LARTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LARTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ431LARTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LARTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LARTR-G1?
AZ431LARTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LARTR-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 AZ431LARTR-G1?
For technical support, including AZ431LARTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LARTR-G1 requirements.
6.How does Aetrix verify that AZ431LARTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ431LARTR-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 AZ431LARTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ431LARTR-G1?
All AZ431LARTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LARTR-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 AZ431LARTR-G1 part is unused and in its original packaging.
Return procedure for AZ431LARTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LARTR-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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