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Diodes Incorporated AS431AZTR-G1
- Part No.:
- AS431AZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AS431AZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ TO92
- Quantity:
- Payment:
- Shipping:
Inventory:3,947
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Product details
Overview
AS431AZTR-G1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.5% 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 where low temperature coefficient (20 ppm/°C typical), sharp turn-on, and 0.15Ω dynamic impedance are critical.
For engineers reviewing the AS431AZTR-G1 datasheet, AS431AZTR-G1 pinout, AS431AZTR-G1 application, or AS431AZTR-G1 equivalent, this device serves as a stable, low-noise, capacitive-load-tolerant voltage reference for feedback loops in DC-DC converters, adapter circuits, and graphic card VRMs - requiring exact VREF accuracy, sink current capability up to 100mA, and RoHS-compliant green packaging.
Technical Context
The AS431AZTR-G1 implements a bandgap-based precision reference core with internal error amplifier and NPN pass transistor, enabling adjustable regulation via external resistor divider between cathode and reference pins. Its functional block includes a 2.5V reference, high-gain comparator, and low-impedance cathode driver.
It operates in shunt mode with cathode-to-anode voltage up to 36V, reference input current below 4µA typical, and maintains regulation down to 0.4mA minimum cathode current. Stability is ensured across 0–100µF load capacitance without oscillation under specified boundary conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500 V ±0.5% - sets precise feedback threshold for closed-loop regulation |
| Output Range | 2.5V to 36V - programmable via external resistive divider, supporting wide-input adapters and multi-rail PSUs |
| Temp Coefficient | 20 ppm/°C typical - ensures ≤16 mV VREF drift over –40°C to +125°C, critical for automotive/industrial operation |
| ZKA | 0.15 Ω typical - enables tight regulation under varying load/sink current (1–100 mA) |
| IKA Range | 1.0–100 mA - supports high-current shunt applications like 1A PWM converter references |
| Operating Temp | –40°C to +125°C - qualified for under-hood, industrial, and embedded computing environments |
| Package | TO92 (Ammo Packing) - through-hole compatible, 2000 pcs/reel, lead-free & halogen-free "Green" compliant |
Pinout & Package
AS431AZTR-G1 is supplied in TO92 (Ammo Packing) package: 3-pin through-hole, 4.3mm × 4.7mm × 12.5mm body, with standard JEDEC TO-92 outline and lead-free/green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference ground return path | Connected to system ground; completes reference current loop and defines cathode voltage reference point |
| Pin 2 (Cathode) | Regulated output node | Sinks adjustable current to maintain VREF across R1–R2 divider; connects to PSU feedback node or error amplifier input |
| Pin 3 (Ref) | Precision reference input | Accepts 2.5V reference voltage; tied to divider midpoint to enable output programming from 2.5V to 36V |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.5V to 36V - eliminates need for multiple Zener values; single BOM item covers broad PSU designs |
| Low Temperature Deviation | 4.5 mV typical over full range - reduces calibration burden in temperature-varying environments |
| High Capacitive Load Stability | No oscillation up to 100 µF - enables direct use with bulk output caps in switchers without added compensation |
| Sink Current Capacity | 1 mA to 100 mA - supports both low-power bias networks and high-current feedback paths in 1A+ regulators |
| RoHS/Green Compliance | Halogen- and antimony-free, <900 ppm Br/Cl, <1000 ppm Sb - meets global environmental compliance mandates |
Applications
| Switching Power Supply | Battery Charger |
|---|---|
|
Use Scenario: Primary-side feedback in isolated flyback converters for AC-DC adapters. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise VREF to optocoupler input, enabling ±1% output regulation. Use Value: 0.5% VREF tolerance and 20 ppm/°C TC ensure consistent output voltage across line/load/temperature without trimming. |
Use Scenario: Constant-voltage stage in Li-ion wall charger with 5V/9V/12V USB PD negotiation. IC Role / Device Role / Timing Role: Precision reference for secondary-side error amplifier controlling synchronous rectifier duty cycle. Use Value: Low 0.15Ω dynamic impedance maintains regulation during fast load transients (e.g., USB device plug-in). |
| Voltage Adapter | Graphic Card VRM |
|
Use Scenario: Step-down DC-DC module converting 12V to 5V/3.3V for peripheral rails in industrial gateways. IC Role / Device Role / Timing Role: Shunt regulator setting feedback voltage of buck controller IC, replacing discrete Zener + resistor network. Use Value: Sharp turn-on and low noise (<10 µV RMS) prevent switching ripple coupling into sensitive analog subsystems. |
Use Scenario: Reference for GPU core voltage (VDDC) regulation in PCIe graphics cards. IC Role / Device Role / Timing Role: High-stability reference feeding multiphase controller's remote sensing input under high di/dt load steps. Use Value: –40°C to +125°C operation and 100mA sink capability support transient-heavy GPU workloads without reference droop. |
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 | 2.5V ±1% VREF, SOIC-8 package, higher IREF (2µA max), 0.22Ω ZKA | Requires PCB real estate for SOIC vs. TO92; better suited for board-level integration than through-hole legacy designs | Select when surface-mount assembly and tighter layout control are available; avoid if TO92 mechanical fit or ammo reel logistics are required |
| AS431BNTR-G1 | Same TO92 package and pinout, but 1.0% VREF tolerance and identical thermal specs | Acceptable where ±1% output regulation suffices (e.g., non-critical auxiliary rails), reducing cost by ~12% | Choose for cost-sensitive industrial adapters where 2.5V ±25mV tolerance is acceptable and RoHS/Green compliance remains mandatory |
Compared with TL431ACDR and AS431BNTR-G1, AS431AZTR-G1 uniquely delivers 0.5% VREF accuracy in TO92 ammo packing - enabling high-precision through-hole designs without sacrificing environmental compliance or thermal robustness.
Availability
AS431AZTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and voltage adapters requiring stable component supply, long-term lifecycle continuity, and RoHS/Green compliance.
Supply support for AS431AZTR-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, specializing in high-reliability power management, signal integrity, and protection solutions.
The AS431 belongs to Diodes' precision reference product line, engineered for high-accuracy, thermally stable voltage regulation in power conversion, battery management, and industrial control systems.
FAQ
What is the minimum cathode current required for regulation in AS431AZTR-G1?
The AS431AZTR-G1 requires a minimum cathode current of 0.4 mA to maintain regulation, verified per Electrical Characteristics table (IKA(Min) parameter). This low threshold allows reliable operation even in high-resistance feedback networks or low-power standby modes.
Can AS431AZTR-G1 replace a standard Zener diode directly in existing designs?
Yes - AS431AZTR-G1 uses identical TO92 pinout (Anode-Cathode-Ref) and operates as a 3-terminal Zener substitute. External resistor divider replaces Zener's fixed value, enabling precise, temperature-stable output without circuit topology changes.
Does AS431AZTR-G1 require external compensation for stability?
No external compensation is needed: the device remains stable with load capacitance up to 100 µF across its operating range, as confirmed in Performance Characteristics plots. This eliminates compensation components in most SMPS feedback paths.
What does the "G1" suffix indicate in AS431AZTR-G1?
The "G1" suffix denotes Diodes Incorporated's "Green" compliance: fully RoHS-compliant, halogen-free (<900 ppm Br/Cl), antimony-free (<1000 ppm), and lead-free - meeting EU Directive 2015/863/EU and Diodes' internal green material standards.
AS431AZTR-G1 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:
- ±0.5%
- 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
AS431AZTR-G1 FAQ
1.How can I place an order for AS431AZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431AZTR-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 AS431AZTR-G1 reliable?
The price and inventory of AS431AZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431AZTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431AZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431AZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431AZTR-G1?
AS431AZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431AZTR-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 AS431AZTR-G1?
For technical support, including AS431AZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431AZTR-G1 requirements.
6.How does Aetrix verify that AS431AZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431AZTR-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 AS431AZTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431AZTR-G1?
All AS431AZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431AZTR-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 AS431AZTR-G1 part is unused and in its original packaging.
Return procedure for AS431AZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431AZTR-G1 Tags
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TL431AIDBZR
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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
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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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