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Diodes Incorporated AS431IANTR-G1
- Part No.:
- AS431IANTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AS431IANTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
AS431IANTR-G1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.5% initial reference voltage tolerance (2.500 V), 10 µA typical minimum cathode current for regulation, and operation across –40°C to +125°C. It replaces Zener diodes in feedback loops of switching power supplies, battery chargers, and precision voltage references where low temperature drift (4.5 mV max over full range) and stable capacitive-load performance are required.
For engineers reviewing the AS431IANTR-G1 datasheet, AS431IANTR-G1 pinout, AS431IANTR-G1 application, or AS431IANTR-G1 equivalent, key selection criteria include cathode voltage range (2.5 V to 36 V), dynamic impedance (0.15 Ω typ), thermal stability, and SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The AS431IANTR-G1 functions as a programmable shunt reference with an internal bandgap-derived 2.5 V reference and high-gain error amplifier. Its sharp turn-on and low output impedance enable precise regulation even under light load or high-capacitance conditions.
It operates in a two-node configuration: cathode connects to regulated output node, anode to ground or return path, and reference pin senses feedback divider. Regulation is maintained when cathode voltage exceeds VREF × (1 + R1/R2), with sink current ranging from 50 µA to 100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 2.500 V ±0.5% at +25°C - sets base accuracy for all output voltages via external resistor divider |
| Cathode Voltage Range | 2.5 V to 36 V - enables programmable output from 2.5 V up to near system rail without external biasing |
| Min Cathode Current (IKAmin) | 10 µA typical, 50 µA max - allows regulation in ultra-low-power standby or monitoring circuits |
| Dynamic Impedance (ZKA) | 0.15 Ω typical at 1–100 mA - ensures minimal output voltage shift under load transients |
| Temp Coefficient (∆VREF) | 4.5 mV typical over –40°C to +125°C - supports stable reference in automotive and industrial ambient extremes |
| Operating Temp Range | –40°C to +125°C - qualified for under-hood, industrial control, and high-density power converter environments |
| Package | SOT-23 - surface-mount, 3-pin, footprint-compatible with standard pick-and-place and reflow processes |
Pinout & Package
SOT-23 package: compact 3-pin surface-mount outline with 1.9 mm × 2.8 mm body, 0.95 mm lead pitch, and JEDEC-standard footprint. Thermal resistance θJC = 113°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF | High-impedance reference input - connects to center tap of feedback resistor divider; draws only 0.035 µA typical |
| 2 | ANODE | Ground reference node - must be connected to system common/return; defines current sink path |
| 3 | CATHODE | Regulated output node - sinks current to maintain set voltage; interfaces directly with power stage error amplifier |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.5 V to 36 V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Low Minimum Cathode Current | 10 µA typical - enables use in always-on monitoring circuits without compromising quiescent power |
| Stability Under Capacitive Load | No oscillation with ≥100 µF output capacitance - simplifies EMI filtering and eliminates need for series damping resistors |
| Low Output Noise | Sub-10 µVRMS broadband noise - preserves signal integrity in precision analog sensing and ADC reference paths |
| Lead-Free & Green Compliance | RoHS 3 compliant, halogen- and antimony-free - meets IPC-1752A material declaration and automotive ELV requirements |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Regulation |
|---|---|
|
Use Scenario: Primary-side feedback loop in isolated flyback or forward converters requiring accurate output voltage regulation. IC Role / Device Role / Timing Role: Shunt regulator providing error signal to optocoupler input, replacing discrete Zener + transistor. Use Value: Enables ±1% output accuracy over line, load, and temperature with no secondary-side controller. |
Use Scenario: Constant-voltage stage in multi-stage Li-ion or lead-acid battery charger ICs or discrete designs. IC Role / Device Role / Timing Role: Precision voltage reference for comparator-based CV loop termination. Use Value: Ensures cell voltage stays within ±5 mV of target, extending cycle life and preventing overcharge. |
| Graphics Card VRM Reference | Industrial PLC Analog Input Reference |
|
Use Scenario: Voltage reference for GPU core voltage (VDDC) regulation in high-current, multi-phase VRMs. IC Role / Device Role / Timing Role: Stable shunt reference feeding multiphase controller's feedback network. Use Value: Maintains <±0.5% output tolerance despite rapid load transients and board-level thermal gradients. |
Use Scenario: Reference source for 16-bit SAR ADCs measuring 4–20 mA loop signals or sensor outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference for ADC reference input (VREF+). Use Value: Limits total unadjusted error to <0.01% FS over –40°C to +85°C, meeting IEC 61000-6-2 immunity specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.5 V reference, ±1% tolerance, higher min cathode current (100 µA), SOT-23 package | Less suitable for ultra-low-power standby modes due to higher IKAmin | Select when cost sensitivity outweighs quiescent current requirements and ±1% tolerance is acceptable |
| AP431SASNTR-G1 | Same manufacturer, improved thermal stability (3.5 mV max), lower dynamic impedance (0.10 Ω), pin-compatible SOT-23 | Drop-in replacement with tighter spec margins; recommended for new designs per Diodes' notice | Prefer for next-generation designs requiring enhanced long-term reliability and reduced thermal drift |
Compared with TL431ACDBVR and AP431SASNTR-G1, the AS431IANTR-G1 offers superior low-current regulation capability and tighter initial tolerance, making it optimal for legacy designs where IKAmin < 50 µA is critical-but AP431SASNTR-G1 is preferred for new designs requiring extended lifetime stability.
Availability
AS431IANTR-G1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and industrial analog reference applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AS431IANTR-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 solutions for power management, signal integrity, and connectivity applications.
The AS431I series belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy, thermally stable voltage references in power conversion and industrial control systems.
FAQ
What is the maximum cathode voltage the AS431IANTR-G1 can regulate?
The AS431IANTR-G1 supports cathode voltages up to 36 V under recommended operating conditions. Absolute maximum rating is 40 V, but sustained operation above 36 V risks exceeding thermal limits and degrading long-term stability. Designers must ensure power dissipation remains within package limits using PD = (VK − VREF) × IKA.
Can the AS431IANTR-G1 drive >100 mA cathode current?
No. The datasheet specifies a continuous cathode current range of –100 mA to +150 mA, but recommended operating maximum is 100 mA. Exceeding 100 mA risks thermal runaway in SOT-23 due to its 370 mW power dissipation limit and 113°C/W junction-to-case thermal resistance-especially above +85°C ambient.
How does the AS431IANTR-G1 differ from standard TL431 variants?
The AS431IANTR-G1 features lower minimum cathode current (10 µA vs. 100 µA for TL431), tighter initial tolerance (0.5% vs. 1–2%), and guaranteed stability with ≥100 µF capacitive loads. It also offers wider temperature range (–40°C to +125°C vs. –40°C to +85°C for many TL431 grades) and RoHS 3/halogen-free compliance as standard.
Is the SOT-23 pinout compatible with TL431 footprints?
Yes-the AS431IANTR-G1 uses standard SOT-23 pin 1 (REF), pin 2 (ANODE), pin 3 (CATHODE), matching TL431ACDBVR and most industry-standard shunt regulators. However, layout must verify thermal pad clearance and solder mask definition per Diodes' suggested pad dimensions (X=0.80 mm, Y=0.90 mm, E=0.95 mm).
AS431IANTR-G1 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:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 50 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AS431IANTR-G1 FAQ
1.How can I place an order for AS431IANTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431IANTR-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 AS431IANTR-G1 reliable?
The price and inventory of AS431IANTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431IANTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431IANTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431IANTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431IANTR-G1?
AS431IANTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431IANTR-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 AS431IANTR-G1?
For technical support, including AS431IANTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431IANTR-G1 requirements.
6.How does Aetrix verify that AS431IANTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431IANTR-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 AS431IANTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431IANTR-G1?
All AS431IANTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431IANTR-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 AS431IANTR-G1 part is unused and in its original packaging.
Return procedure for AS431IANTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431IANTR-G1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
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
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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