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Diodes Incorporated AZ431AN-ATRG1
- Part No.:
- AZ431AN-ATRG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431AN-ATRG1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:706
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Product details
Overview
AZ431AN-ATRG1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.4% reference voltage tolerance, 2.5V to 36V programmable output, 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 deviation over full temperature range.
For engineers reviewing the AZ431AN-ATRG1 datasheet, AZ431AN-ATRG1 pinout, AZ431AN-ATRG1 application, or AZ431AN-ATRG1 equivalent, this device serves as a high-stability, low-noise, capacitive-load-tolerant voltage reference for feedback loops requiring tight regulation across industrial and automotive ambient conditions.
Technical Context
The AZ431AN-ATRG1 operates as a two-input (REF, ANODE), one-output (CATHODE) shunt regulator with internal bandgap reference and error amplifier. Its sharp turn-on characteristic and low 20ppm/°C temperature coefficient enable stable closed-loop control in isolated DC-DC converters and linear post-regulators.
It functions within a cathode current range of 1mA–100mA and supports cathode voltages up to 36V while maintaining regulation. The device exhibits high phase margin under ≥10µF capacitive loads and delivers <1µA reference input current at 25°C - critical for low-power bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 2.500 V ±0.4% - sets precise feedback threshold for output regulation |
| Output Voltage Range | 2.5V to 36V - programmable via external resistor divider without auxiliary supply |
| Dynamic Impedance (ZKA) | 0.15 Ω typical - ensures minimal output voltage perturbation under load transients |
| Temp. Coefficient (ΔVREF/°C) | 20 ppm/°C typical - enables stable reference performance across −40°C to +125°C |
| Cathode Current Range | 1.0 mA to 100 mA - supports both low-power sensing and high-current shunt applications |
| Reference Input Current (IREF) | 0.7 µA typical at 25°C - reduces divider power loss and improves efficiency in high-resistance networks |
| Thermal Stability (ΔVREF) | 4.5 mV max over −40°C to +125°C - guarantees ≤0.18% reference drift in extended environments |
Pinout & Package
This device is supplied in SOT23-3 package (lead-free, RoHS-compliant, "Green" halogen/antimony-free molding compound), with standard top-view pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node connected to internal bandgap reference; sets regulation point via external divider |
| Pin 2 (ANODE) | Anode Terminal | Return path for reference current; tied to system ground or negative rail in standard configurations |
| Pin 3 (CATHODE) | Cathode Output | Current-sinking output node; connects to feedback node of power stage to regulate output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable 2.5V–36V output | Enables single BOM part to support multiple output rails without redesigning feedback networks |
| 0.4% initial VREF tolerance | Reduces need for post-production trimming in precision power supplies and ADC references |
| Stable under ≥10 µF capacitive load | Eliminates need for external compensation in buck converter feedback paths with ceramic output caps |
| −40°C to +125°C operation | Validated for under-hood automotive modules and industrial motor drives without derating |
| 0.15 Ω dynamic impedance | Maintains <10 mV output deviation during 50 mA load steps - critical for FPGA core rail stability |
Applications
| Switching Power Supply Feedback | Battery Charger Reference |
|---|---|
|
Use Scenario: Primary-side feedback in isolated flyback converters for AC/DC adapters. IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference to optocoupler LED drive circuit. Use Value: Enables ±1% output regulation across line/load/temperature with no secondary-side controller. |
Use Scenario: Constant-voltage stage in multi-cell Li-ion charger ICs. IC Role / Device Role / Timing Role: Precision reference for charger IC's internal DAC or comparator threshold. Use Value: Ensures cell voltage accuracy within ±5 mV - directly extending battery cycle life and safety margin. |
| Voltage Adapter Regulation | Graphic Card VRM Monitoring |
|
Use Scenario: Low-cost 12V-to-5V/3.3V adapter for legacy peripherals in embedded systems. IC Role / Device Role / Timing Role: Adjustable shunt element in series-pass or LDO-assisted topology. Use Value: Delivers stable output without dedicated LDO IC - reducing BOM count and PCB area. |
Use Scenario: Real-time rail monitoring and fault detection in GPU power delivery networks. IC Role / Device Role / Timing Role: High-stability reference for ADC input scaling in VRM telemetry circuits. Use Value: Enables <±0.5% rail measurement accuracy - essential for dynamic voltage/frequency scaling algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBVR | 0.5% VREF tolerance, 1.24V min VREF, 18V max cathode voltage, higher IREF (1.2µA typ) | Limited to lower-voltage rails (<18V); less suitable for 24V industrial PSUs | Select when lower reference voltage or tighter cost target outweighs 36V headroom need |
| AS431AZTR-E1 | 0.4% tolerance, TO92 package only, 300 mW power dissipation limit vs. SOT23's 370 mW | Requires larger PCB footprint and lacks SMT compatibility for high-density layouts | Choose only for through-hole assembly or legacy board rework where SMT is unavailable |
Compared with TLVH431AIDBVR and AS431AZTR-E1, the AZ431AN-ATRG1 uniquely combines 36V cathode rating, SOT23-3 compactness, and 0.4% tolerance - making it optimal for space-constrained, wide-input industrial power supplies needing long-term thermal stability.
Availability
AZ431AN-ATRG1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and precision voltage reference designs requiring stable component supply with full industrial temperature support and RoHS/Green compliance.
Supply support for AZ431AN-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.
The AZ431-A series was designed specifically for precision shunt regulation in cost-sensitive, thermally demanding power conversion systems - emphasizing low drift, wide operating range, and drop-in Zener replacement capability.
FAQ
What is the minimum cathode current required for regulation in AZ431AN-ATRG1?
The AZ431AN-ATRG1 requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in its Electrical Characteristics table. This value ensures stable reference operation even in ultra-low-power feedback networks where divider currents are minimized to reduce standby losses.
Can AZ431AN-ATRG1 replace a standard Zener diode directly in existing designs?
Yes - AZ431AN-ATRG1 can directly replace Zener diodes rated between 2.5V and 36V by connecting REF to the divider midpoint, ANODE to ground, and CATHODE to the Zener cathode node. No additional components are needed, though layout should observe SOT23 thermal pad guidelines for >50 mA operation.
Does AZ431AN-ATRG1 require external compensation for stability?
No external compensation is required for stability with capacitive loads up to 10 µF, as confirmed in the datasheet's Stability Boundary Conditions plot. For loads exceeding 10 µF, a small series resistor (≤10 Ω) between CATHODE and capacitor may be added to ensure phase margin remains >45°.
What does the 'G1' suffix indicate in AZ431AN-ATRG1?
The 'G1' suffix denotes Diodes Incorporated's "Green" packaging: halogen- and antimony-free molding compound compliant with RoHS 3 (2015/863/EU), containing <900 ppm bromine, <900 ppm chlorine, and <1000 ppm antimony compounds - verified per company quality documentation.
AZ431AN-ATRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AZ431AN-ATRG1 FAQ
1.How can I place an order for AZ431AN-ATRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AN-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 AZ431AN-ATRG1 reliable?
The price and inventory of AZ431AN-ATRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AN-ATRG1 is usually 5 days.
3.What payment methods are accepted for AZ431AN-ATRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AN-ATRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AN-ATRG1?
AZ431AN-ATRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AN-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 AZ431AN-ATRG1?
For technical support, including AZ431AN-ATRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AN-ATRG1 requirements.
6.How does Aetrix verify that AZ431AN-ATRG1 is sourced from the original manufacturer or authorized distributors?
All AZ431AN-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 AZ431AN-ATRG1 meets industry standards.
7.What is the process for return or replacement of AZ431AN-ATRG1?
All AZ431AN-ATRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AN-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 AZ431AN-ATRG1 part is unused and in its original packaging.
Return procedure for AZ431AN-ATRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431AN-ATRG1 Tags
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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
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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