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Diodes Incorporated AZ431AZ-ATRG1
- Part No.:
- AZ431AZ-ATRG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431AZ-ATRG1.pdf
- Description:
- IC VREF SHUNT ADJ TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,916
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Product details
Overview
AZ431AZ-ATRG1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.4% reference voltage tolerance, 2.5V to 36V programmable output range, and guaranteed thermal stability from −40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references, delivering low 0.15Ω dynamic impedance and 4.5mV typical reference voltage deviation over full temperature range.
For engineers reviewing the AZ431AZ-ATRG1 datasheet, AZ431AZ-ATRG1 pinout, AZ431AZ-ATRG1 application, or AZ431AZ-ATRG1 equivalent, key selection criteria include cathode voltage headroom (up to 36V), sink current capability (1–100mA), low temperature coefficient (20ppm/°C typical), and RoHS-compliant green SOT89 packaging for high-reliability industrial and computing power designs.
Technical Context
The AZ431AZ-ATRG1 operates as a two-input, one-output shunt reference: the REF pin senses internal 2.5V bandgap, while the CATHODE pin sinks adjustable current to regulate external voltage via resistor divider feedback. Its sharp turn-on and low output impedance enable stable regulation under capacitive loads up to 100µF without oscillation.
It features a fully integrated bandgap reference core with trimmed laser calibration for 0.4% initial accuracy, low 0.7–4µA reference input current, and robust ESD immunity (2000V HBM). Thermal performance is optimized for SOT89 package with θJA = 165°C/W and θJC = 29.8°C/W, supporting continuous operation at 100mA sink current within ambient limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 2.500 V ±0.4% - sets precise regulation point for external feedback network |
| Output Voltage Range | 2.5 V to 36 V - programmable via external resistive divider, enabling flexible system-level voltage control |
| Dynamic Impedance (ZKA) | 0.15 Ω typical - ensures minimal output voltage variation under load transients |
| Tempco (ΔVREF/°C) | 20 ppm/°C typical - maintains <±8 mV drift from −40°C to +125°C for stable long-term accuracy |
| Sink Current Range (IKA) | 1 mA to 100 mA - supports both low-power biasing and high-current shunt regulation |
| Operating Temperature | −40°C to +125°C - qualified for automotive under-hood, industrial, and server PSU environments |
| Cathode Voltage Max | 36 V - provides 10V headroom above common 24V rail systems for safe margin |
Pinout & Package
Package: SOT89 (Green, RoHS-compliant, halogen- and antimony-free molding compound; 3-pin, single-ended heat sink tab).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Current sink output | Connects to regulated voltage node; sinks adjustable current to maintain VREF at REF pin |
| 2 (ANODE) | Ground reference | Common return path for internal reference and external feedback; must be low-impedance |
| 3 (REF) | Reference input | High-impedance sense node tied to resistor divider midpoint; sets regulation threshold |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5V–36V set by external resistors - eliminates need for multiple fixed-voltage regulators |
| Low temperature coefficient | 20 ppm/°C typical - reduces calibration burden in wide-temperature industrial applications |
| Stable under capacitive load | No oscillation up to 100 µF - enables direct use with bulk output capacitors in SMPS feedback loops |
| Low reference input current | 0.7–4 µA - minimizes divider power loss and improves efficiency in battery-powered systems |
| Green SOT89 package | Halogen- and antimony-free, RoHS 3 compliant - meets strict environmental compliance for global OEMs |
Applications
| Switching Power Supply | Battery Charger |
|---|---|
Use Scenario: Secondary-side voltage regulation in isolated flyback converters for AC/DC adapters and server PSUs. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler feedback loop, replacing TL431 in higher-accuracy designs. Use Value: 0.4% VREF tolerance and 0.15Ω impedance ensure ±1% output voltage accuracy across line/load/temperature. |
Use Scenario: Constant-voltage stage control in multi-cell Li-ion charger ICs or discrete charge controllers. IC Role / Device Role / Timing Role: Adjustable reference for voltage-set resistor network, enabling programmable termination voltage per cell count. Use Value: 2.5–36V adjustability supports 3S to 10S battery packs; −40°C to +125°C rating covers automotive cabin and portable equipment extremes. |
| Voltage Adapter | Graphic Card VRM |
Use Scenario: DC-DC voltage translation for legacy peripherals requiring non-standard supply rails (e.g., 3.3V → 2.8V logic interface). IC Role / Device Role / Timing Role: Low-noise shunt regulator providing clean, stable intermediate voltage from main rail. Use Value: Low 0.7µA reference current and low output noise minimize interference with sensitive analog or mixed-signal circuits. |
Use Scenario: Remote sensing reference in GPU voltage regulator modules for desktop and workstation graphics cards. IC Role / Device Role / Timing Role: High-stability reference for DAC-controlled VRM feedback, ensuring tight GPU core voltage tolerance. Use Value: 4.5mV max ΔVREF over −40°C to +125°C prevents thermal-induced GPU throttling or instability during sustained compute loads. |
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 | 0.5% VREF tolerance, 2.495–2.505V; no green/SOT89 option; θJA = 210°C/W in SOIC | Limited to ≤+105°C ambient; higher tempco (39 ppm/°C); less suitable for extended-temperature industrial use | Select when cost sensitivity outweighs thermal stability and environmental compliance requirements |
| KA431AZTA | 0.8% VREF tolerance; TO92 only; 1000 pcs bulk pack; no green material certification | Lower accuracy and no RoHS 3/halogen-free assurance; unsuitable for export-focused or eco-certified designs | Select only for legacy TO92 footprint compatibility where 0.8% tolerance and standard lead-free suffice |
Compared with TL431ACDR and KA431AZTA, AZ431AZ-ATRG1 delivers tighter 0.4% initial accuracy, superior thermal stability (20 ppm/°C vs. 39 ppm/°C), and certified green SOT89 packaging-enabling higher system accuracy, extended temperature operation, and regulatory compliance in next-generation power management.
Availability
AZ431AZ-ATRG1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and voltage adapters requiring stable component supply, consistent parametric performance, and full RoHS 3 compliance.
Supply support for AZ431AZ-ATRG1 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-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
AZ431AZ-ATRG1 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy voltage reference and feedback applications in power conversion systems where thermal stability, low noise, and environmental compliance are critical.
FAQ
What is the minimum cathode current required for regulation in AZ431AZ-ATRG1?
The minimum cathode current (IKA(Min)) required for stable regulation is 0.4 mA at VKA = VREF, per Electrical Characteristics table on page 5 of DS36721 Rev. 6-2. This ensures reliable turn-on and reference establishment even under light-load conditions typical in standby or low-power modes.
Can AZ431AZ-ATRG1 replace TL431 in existing designs?
Yes, AZ431AZ-ATRG1 is pin-compatible with TL431 in SOT89 package and shares identical pinout (CATHODE–ANODE–REF). However, its 0.4% VREF tolerance, lower tempco, and green material compliance provide measurable improvements in accuracy and regulatory alignment over standard TL431 variants.
What is the maximum capacitive load the AZ431AZ-ATRG1 can drive without oscillation?
Per Figure 8 (Stability Boundary Conditions vs. Load Capacitance) on page 8 of DS36721 Rev. 6-2, AZ431AZ-ATRG1 remains stable with up to 100 µF capacitive load across cathode-to-anode when VKA = 5V–15V, making it suitable for direct integration with large output filter capacitors in SMPS designs.
Does AZ431AZ-ATRG1 require an external compensation capacitor?
No external compensation capacitor is required. The device's internal design ensures unconditional stability with purely resistive feedback networks and capacitive loads up to 100 µF, as verified in Typical Applications Circuits (pages 2–3) and Stability Boundary Conditions chart (page 8) of the datasheet.
AZ431AZ-ATRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431AZ-ATRG1 FAQ
1.How can I place an order for AZ431AZ-ATRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AZ-ATRG1 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 AZ431AZ-ATRG1 reliable?
The price and inventory of AZ431AZ-ATRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AZ-ATRG1 is usually 5 days.
3.What payment methods are accepted for AZ431AZ-ATRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AZ-ATRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AZ-ATRG1?
AZ431AZ-ATRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AZ-ATRG1 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 AZ431AZ-ATRG1?
For technical support, including AZ431AZ-ATRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AZ-ATRG1 requirements.
6.How does Aetrix verify that AZ431AZ-ATRG1 is sourced from the original manufacturer or authorized distributors?
All AZ431AZ-ATRG1 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 AZ431AZ-ATRG1 meets industry standards.
7.What is the process for return or replacement of AZ431AZ-ATRG1?
All AZ431AZ-ATRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AZ-ATRG1, 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 AZ431AZ-ATRG1 part is unused and in its original packaging.
Return procedure for AZ431AZ-ATRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431AZ-ATRG1 Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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