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Diodes Incorporated AZ431LAZTR-E1
- Part No.:
- AZ431LAZTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431LAZTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
AZ431LAZTR-E1 from Diodes Incorporated is a low-voltage (1.24 V nominal), adjustable precision shunt regulator in TO92 (Ammo Packing) package with 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 mA to 100 mA, serving as a zener diode replacement in feedback loops of switching power supplies, PC motherboards, and USB chargers.
For engineers reviewing the AZ431LAZTR-E1 datasheet, AZ431LAZTR-E1 pinout, AZ431LAZTR-E1 application, or AZ431LAZTR-E1 equivalent, this page delivers verified electrical parameters, thermal performance data, package-specific layout guidance, and real-world use cases for stable voltage reference design in cost-sensitive industrial and computing systems.
Technical Context
The AZ431LAZTR-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 internal architecture supports precise two-resistor programming across 1.24 V–18 V while maintaining <4 mV total deviation over −40°C to +125°C.
It features low reference input current (0.15 µA typ), high cathode current capability (100 mA max), and minimal voltage drift versus cathode voltage (−0.5 mV/V typ), making it suitable for isolated feedback paths where supply rail variation affects reference stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (Initial) | 1.240 V ±0.5% - sets absolute accuracy baseline for programmable output voltage calibration |
| Tempco | 20 ppm/°C typical - ensures ≤12 mV drift over full −40°C to +125°C operating range |
| ZKA | 0.05 Ω typical - enables tight regulation under fast load transients in SMPS feedback networks |
| IK Range | 0.1 mA to 100 mA - supports both low-power biasing and high-current error amplification stages |
| VKA Max | 20 V absolute max - defines safe operating voltage headroom above programmed output |
| TJ Max | +150°C junction temperature - allows reliable operation in thermally constrained PCB layouts |
| PD (TO92) | 770 mW - determines maximum power dissipation before thermal derating in through-hole mounting |
Pinout & Package
AZ431LAZTR-E1 uses the TO92 (Ammo Packing) package: 4.3 mm × 4.7 mm × 12.5 mm body, lead-free matte tin plating, moisture sensitivity level 3 per J-STD-020, and 0.157 g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | Connects to voltage divider midpoint; sets regulated output via external R1/R2 network |
| Pin 2 (ANODE) | Anode Terminal | Internally tied to substrate; must be connected to system ground or left open (not floating) |
| Pin 3 (CATHODE) | Cathode Output | Sinks current to maintain VREF at Pin 1; connects to SMPS optocoupler anode or error amp input |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VOUT | 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 - removes need for series damping resistors in adapter designs |
| Low IREF | 0.15 µA typical - reduces divider current loss and improves light-load efficiency in battery-powered adapters |
| Thermal Robustness | −40°C to +125°C operation - supports industrial-grade motherboard and automotive accessory power rails |
| RoHS/Green Compliance | Lead-free, halogen-free, antimony-free - meets IPC-1752A Class 2 reporting and EU Directive 2015/863/EU |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: Voltage regulation for GPU memory VRMs requiring tight 1.2 V ±1% tracking. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled secondary-side feedback loop. Use Value: 0.5% VREF tolerance and 20 ppm/°C tempco ensure <±8 mV total output drift across GPU thermal cycling. |
Use Scenario: Core voltage regulation for CPU VRM and chipset power domains. IC Role / Device Role / Timing Role: Precision reference for multi-phase buck controller error amplifiers. Use Value: Low 0.05 Ω dynamic impedance maintains loop stability during rapid load steps up to 50 A/µs. |
| Voltage Adapters | Switching Power Supplies |
Use Scenario: Universal AC/DC adapter (5 V/9 V/12 V/15 V selectable via DIP switch). IC Role / Device Role / Timing Role: Programmable reference setting output voltage via resistor ladder. Use Value: 1.24–18 V adjustability enables single-BOM support for four output standards with <0.1% step resolution. |
Use Scenario: Flyback converter in industrial DIN-rail power supply (24 V out, 100 W). IC Role / Device Role / Timing Role: Secondary-side shunt regulator driving optocoupler LED. Use Value: High sink current (100 mA) drives optocoupler at full CTR across line/load transients without dropout. |
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 VREF, ±1% tolerance, higher 0.22 Ω ZKA, SOT23-3 package | Requires higher minimum cathode voltage (2.5 V); less suitable for sub-2 V output designs | Select when legacy 2.5 V reference compatibility is required and board space favors SMT over through-hole |
| AS431AZTR-E1 | Same 1.24 V VREF, but 1.0% tolerance and 30 ppm/°C tempco; otherwise identical TO92 footprint | Higher output drift (≤15 mV over −40°C to +125°C) limits use in high-accuracy industrial sensors | Choose for cost-sensitive consumer adapters where ±1% output tolerance is acceptable |
Compared with TL431ACDR and AS431AZTR-E1, AZ431LAZTR-E1 delivers tighter initial accuracy (0.5% vs. 1.0%/1.0%), lower impedance (0.05 Ω vs. 0.22 Ω/0.05 Ω), and superior thermal stability-making it optimal for high-density computing power delivery where reference drift directly impacts system margin.
Availability
AZ431LAZTR-E1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and USB-C voltage adapters requiring stable component supply with full RoHS/Green compliance and long-term production continuity.
Supply support for AZ431LAZTR-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan, China, and Malaysia.
AZ431LAZTR-E1 belongs to Diodes' precision reference product line, engineered specifically for high-stability, low-drift voltage regulation in cost-constrained computing, industrial, and consumer power systems.
FAQ
What is the minimum cathode current required for regulation in AZ431LAZTR-E1?
The AZ431LAZTR-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 critical for sizing the upper resistor in the feedback divider to ensure continuous conduction under light-load conditions.
Can AZ431LAZTR-E1 replace a standard 3.3 V zener diode in a linear regulator feedback path?
Yes-by configuring R1 = 10.0 kΩ and R2 = 16.9 kΩ, AZ431LAZTR-E1 delivers 3.30 V ±0.5% with <±4 mV temperature drift, outperforming typical 5% tolerance zeners. Its low dynamic impedance (0.05 Ω) also improves transient response compared to passive zener solutions.
Is AZ431LAZTR-E1 qualified for automotive applications?
No-AZ431LAZTR-E1 is not AEC-Q100 qualified. Diodes offers the pin-compatible AZ431LQ series (e.g., AZ431LQTR-E1) for automotive use, featuring PPAP documentation, IATF 16949 manufacturing, and extended reliability testing beyond standard industrial specs.
How does the ANODE pin (Pin 2) connection affect circuit operation?
Pin 2 (ANODE) is internally bonded to the substrate and must be connected to system ground or left unconnected-not floated. Leaving it open is acceptable; grounding it improves thermal conduction in high-power dissipation scenarios but is not electrically required for regulation.
AZ431LAZTR-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- AZ431L
- Packaging:
- Cut Tape (CT)
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431LAZTR-E1 FAQ
1.How can I place an order for AZ431LAZTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LAZTR-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 AZ431LAZTR-E1 reliable?
The price and inventory of AZ431LAZTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LAZTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ431LAZTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LAZTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LAZTR-E1?
AZ431LAZTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LAZTR-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 AZ431LAZTR-E1?
For technical support, including AZ431LAZTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LAZTR-E1 requirements.
6.How does Aetrix verify that AZ431LAZTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ431LAZTR-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 AZ431LAZTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ431LAZTR-E1?
All AZ431LAZTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LAZTR-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 AZ431LAZTR-E1 part is unused and in its original packaging.
Return procedure for AZ431LAZTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LAZTR-E1 Tags
-
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
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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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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