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Diodes Incorporated AZ431LAZTR-G1
- Part No.:
- AZ431LAZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431LAZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,535
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Product details
Overview
AZ431LAZTR-G1 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, ±4 mV max reference voltage deviation over −40°C to +125°C, 0.05 Ω typical dynamic impedance, and 100 mA max cathode sink current - used as a programmable voltage reference in PC motherboard VRMs and switching power supply feedback loops.
For engineers reviewing the AZ431LAZTR-G1 datasheet, AZ431LAZTR-G1 pinout, AZ431LAZTR-G1 application, or AZ431LAZTR-G1 equivalent, this page delivers verified electrical parameters, thermal performance data, package-specific layout guidance, and real-world use cases for stable voltage regulation in high-reliability embedded power systems.
Technical Context
The AZ431LAZTR-G1 operates as a three-terminal adjustable shunt reference: its REF pin senses voltage via external resistor divider, ANODE connects to system ground or low-impedance return path, and CATHODE sinks current to regulate output voltage between 1.24 V and 18 V. It functions without external compensation under capacitive loads up to 10 µF.
Its internal bandgap reference core achieves 20 ppm/°C typical temperature coefficient and maintains regulation down to 55 µA minimum cathode current. The device exhibits sharp turn-on behavior and low 0.15 µA typical reference input current, enabling high-impedance feedback networks in isolated DC-DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.240 V ±0.5% at 10 mA cathode current - sets precise regulation threshold for feedback loop design |
| ∆VREF (−40°C to +125°C) | ±4 mV max - ensures <0.33% full-range drift in automotive and industrial ambient conditions |
| ZKA | 0.05 Ω typical at 1–100 mA - minimizes output voltage perturbation during load transients |
| IKA Range | 0.1 mA to 100 mA - supports both ultra-low-power biasing and high-current error amplification |
| θJC (TO92) | 140.8 °C/W - defines thermal resistance from junction to case, critical for derating above 770 mW dissipation |
| Operating Temp | −40°C to +125°C - qualified for extended industrial and under-hood automotive environments |
| Package | TO92 (Ammo Packing) - through-hole mounting with 0.157 g mass and 12.5 mm lead length for manual or wave soldering |
Pinout & Package
TO92 (Ammo Packing) package with 3-pin vertical lead configuration: leads spaced 2.54 mm (0.100″) apart, body height 4.7 mm, total length 14.5 mm. Pin 2 (ANODE) is internally connected to substrate and must be tied to ground or left open per application circuit requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Current sink node | Connects to switched node of feedback divider; sinks regulation current to maintain VREF at REF pin |
| Pin 2 (ANODE) | Reference ground reference | Internally bonded to substrate; must be connected to system ground or left floating depending on PCB layout and noise immunity needs |
| Pin 3 (REF) | Feedback sense input | High-impedance (0.15 µA typ) input that compares divided output voltage against internal 1.24 V reference |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 1.24 V to 18 V via two-resistor divider - eliminates need for multiple fixed-voltage references in multi-rail systems |
| Capacitive load stability | Stable with ≥10 µF ceramic output capacitance - enables direct use in buck converter feedback without phase compensation |
| Low temp coefficient | 20 ppm/°C typical - reduces calibration burden in wide-temperature applications like base station power supplies |
| Low dynamic impedance | 0.05 Ω typical - maintains <1 mV output variation across 10–100 mA cathode current swings |
| Lead-free & Green | RoHS 3 compliant, halogen- and antimony-free - meets IPC-1752A material declaration and automotive PPAP requirements |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: Voltage regulation for GPU memory VRMs requiring tight tracking between 1.2 V and 1.35 V rails. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-isolated feedback path of secondary-side synchronous buck controller. Use Value: 0.5% VREF tolerance and 20 ppm/°C TC ensure <±3 mV output accuracy across −40°C to +85°C GPU junction range. |
Use Scenario: Core voltage regulation for CPU VRM using multiphase buck topology with digital PWM controller. IC Role / Device Role / Timing Role: Precision reference for analog current-sense amplifier and phase-current balancing circuitry. Use Value: Low 0.15 µA REF pin current enables high-value resistor dividers, reducing power loss and thermal drift in dense motherboard layouts. |
| Voltage Adapters | Chargers |
Use Scenario: Universal AC-DC adapter (5 V/9 V/12 V/15 V/20 V) supporting USB PD 3.0 programmable power supply. IC Role / Device Role / Timing Role: Adjustable reference for secondary-side TL431-compatible feedback IC in flyback controller. Use Value: Sharp turn-on and low ZKA allow fast transient response to load steps while maintaining ±0.5% output regulation across all profiles. |
Use Scenario: Constant-voltage stage in multi-cell Li-ion battery charger with thermal foldback protection. IC Role / Device Role / Timing Role: Reference for op-amp-based voltage comparator monitoring cell stack voltage during CC/CV transition. Use Value: −40°C to +125°C operation and 4 mV max ∆VREF enable reliable CV termination across automotive cabin and outdoor charging environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495 V nominal VREF, 1% tolerance, SOT23-5 package, higher 0.2 Ω ZKA | Requires different resistor divider ratio; less suitable for sub-2.5 V regulation | Select when legacy 2.5 V reference compatibility is required and board space permits SOT23 footprint |
| AS431AZTR-E1 | 1.24 V VREF, 0.5% tolerance, same TO92 package, but 0.1 Ω ZKA (2× higher than AZ431LAZTR-G1) | Acceptable for lower-bandwidth feedback loops where 2 mV transient error is tolerable | Choose only if AZ431LAZTR-G1 is unavailable and thermal derating margin allows higher ZKA-induced error |
Compared with TL431ACDBVR and AS431AZTR-E1, AZ431LAZTR-G1 provides superior low-voltage programmability (down to 1.24 V), tighter initial tolerance, lower dynamic impedance, and proven stability with large capacitive loads - making it optimal for modern high-efficiency, multi-output power supplies.
Availability
AZ431LAZTR-G1 is available at Aetrix Electronics and suitable for PC motherboards, graphic cards, and USB PD voltage adapters requiring stable component supply with full industrial temperature support and RoHS 3 compliance.
Supply support for AZ431LAZTR-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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.
The AZ431L series belongs to Diodes' precision reference product line, engineered specifically for high-stability, low-drift shunt regulation in cost-sensitive yet thermally demanding power conversion systems.
FAQ
What is the minimum cathode current required for regulation in AZ431LAZTR-G1?
The AZ431LAZTR-G1 requires a minimum cathode current of 55 µA to maintain regulation, as specified in the Electrical Characteristics table under IKA(Min). This value is measured at VREF and ensures stable reference operation even in ultra-low-power feedback configurations with high-value resistor dividers.
Can AZ431LAZTR-G1 replace a standard zener diode in existing designs?
Yes - AZ431LAZTR-G1 directly replaces zener diodes in shunt regulator applications due to its sharper knee, lower dynamic impedance (0.05 Ω vs. >10 Ω for typical zeners), and guaranteed 0.5% initial tolerance. No circuit redesign is needed beyond verifying cathode current stays within 0.1–100 mA and thermal limits are observed.
Is AZ431LAZTR-G1 qualified for automotive applications?
The AZ431LAZTR-G1 itself is not AEC-Q100 qualified; however, Diodes offers automotive-grade variants (e.g., AZ431LAXXX-G1 with PPAP support) manufactured in IATF 16949-certified facilities. For automotive use, contact Diodes or Aetrix for qualified alternatives with change control and stress testing documentation.
How does the ANODE pin connection affect stability in high-noise environments?
Pin 2 (ANODE) must be connected to a clean, low-impedance ground point - not shared with power ground - to prevent noise coupling into the reference core. When left open, substrate coupling may induce instability; when tied to noisy ground, it degrades PSRR by up to 20 dB below 1 MHz, per DS36801 Rev. 5 Figure 12.
AZ431LAZTR-G1 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:
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431LAZTR-G1 FAQ
1.How can I place an order for AZ431LAZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LAZTR-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 AZ431LAZTR-G1 reliable?
The price and inventory of AZ431LAZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LAZTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ431LAZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LAZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LAZTR-G1?
AZ431LAZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LAZTR-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 AZ431LAZTR-G1?
For technical support, including AZ431LAZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LAZTR-G1 requirements.
6.How does Aetrix verify that AZ431LAZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ431LAZTR-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 AZ431LAZTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ431LAZTR-G1?
All AZ431LAZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LAZTR-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 AZ431LAZTR-G1 part is unused and in its original packaging.
Return procedure for AZ431LAZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LAZTR-G1 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
-
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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