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Diodes Incorporated AS431IBNTR-G1
- Part No.:
- AS431IBNTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AS431IBNTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,628
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Product details
Overview
AS431IBNTR-G1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1.0% initial reference voltage tolerance at +25°C, 2.5V reference voltage (VREF), 36V maximum cathode voltage (VKA), 10µA typical minimum cathode current for regulation, and -40°C to +125°C operating temperature range. It replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references where thermal stability and low output impedance are critical.
For engineers reviewing the AS431IBNTR-G1 datasheet, AS431IBNTR-G1 pinout, AS431IBNTR-G1 application, or AS431IBNTR-G1 equivalent, key selection criteria include cathode current capability (50µA–100mA), dynamic impedance (0.15Ω typ), reference voltage deviation over temperature (±4.5mV typ), and SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The AS431IBNTR-G1 operates as a programmable shunt regulator using an internal bandgap reference and high-gain error amplifier to maintain precise cathode-to-anode voltage via external resistor feedback. Its sharp turn-on characteristic and low temperature coefficient (±4.5mV over -40°C to +125°C) enable stable regulation under varying load and thermal conditions.
It supports wide cathode voltage range (2.5V to 36V), sinks up to 100mA cathode current, and maintains stability with capacitive loads up to 100µF-verified by load capacitance vs. stability boundary testing. The device exhibits low dynamic impedance (0.15Ω typ) and minimal reference current drift (0.03–0.3µA over full temperature range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500 V ±1.0% at +25°C - sets precise output voltage via R1/R2 divider; enables 2.5V–36V programmability |
| VKA (Max) | 36 V - maximum cathode-to-anode voltage before regulation loss; defines upper output limit |
| IKA (Min) | 10 µA typ / 50 µA max - minimum cathode current needed to sustain regulation; enables ultra-low-power biasing |
| ZKA | 0.15 Ω typ - low dynamic impedance ensures minimal output voltage variation under fast load transients |
| ∆VREF (–40°C to +125°C) | ±4.5 mV typ - tight thermal drift preserves accuracy across industrial temperature range |
| θJC (SOT-23) | 113 °C/W - junction-to-case thermal resistance informs heatsinking needs in 370mW power dissipation limit |
| IREF | 0.035 µA typ - ultra-low reference input current minimizes divider network loading and power loss |
Pinout & Package
AS431IBNTR-G1 is packaged in RoHS-compliant, halogen-free SOT-23 (TO-236AB) with gull-wing leads and 3-pin configuration. Thermal resistance is 113°C/W (junction-to-case), and maximum power dissipation is 370 mW at TA = +25°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node connected to resistor divider midpoint; senses output voltage and controls regulation |
| 2 (ANODE) | Anode Terminal | Connected to system ground or return path; completes shunt current loop through external resistors |
| 3 (CATHODE) | Cathode Terminal | Connected to regulated output node; sinks current to maintain VOUT = VREF × (1 + R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.5V to 36V via two-resistor feedback - eliminates need for multiple Zener values and simplifies BOM |
| Low minimum cathode current | 10µA typical - enables regulation in ultra-low-power standby circuits without compromising accuracy |
| Stability under capacitive load | Stable with ≥100µF load capacitance - avoids oscillation in SMPS feedback loops and LDO-like configurations |
| Low output noise | Sub-10µV RMS (typical) - preserves signal integrity in precision analog sensing and ADC reference applications |
| Wide temperature operation | -40°C to +125°C - qualified for automotive under-hood, industrial motor control, and telecom power systems |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Regulation |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback or forward converters. IC Role / Device Role / Timing Role: Shunt regulator providing optocoupler bias and precise feedback reference to primary-side controller. Use Value: 0.15Ω dynamic impedance ensures <10mV output deviation during 100mA load steps, improving cross-regulation. |
Use Scenario: Constant-voltage stage in multi-stage Li-ion charger ICs or discrete charger designs. IC Role / Device Role / Timing Role: Adjustable reference setting charge termination threshold (e.g., 4.2V ±0.5%) with thermal compensation. Use Value: ±4.5mV VREF drift over -40°C to +125°C limits voltage error to ±0.1% across full ambient range. |
| Graphics Card VRM Reference | Precision 5V/1A Linear Regulator |
|
Use Scenario: Remote sensing of GPU core voltage (VDDC) in high-current VRMs with remote feedback traces. IC Role / Device Role / Timing Role: High-stability shunt reference compensating for PCB trace IR drop in 50–100A power delivery networks. Use Value: Low IREF (0.035µA typ) prevents significant error in high-impedance sense dividers used for remote sensing. |
Use Scenario: Low-noise 5V supply for analog front-ends, DACs, or sensor signal chains requiring <10ppm/°C drift. IC Role / Device Role / Timing Role: Precision shunt element in series-pass transistor-based linear regulator with 2.5V reference amplification. Use Value: 0.5Ω max dynamic impedance ensures <0.5mV output change per 1mA load variation, meeting 12-bit DAC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 2.495V reference, ±2% tolerance, higher min cathode current (1mA typ), SOT-23 package | Lower accuracy and higher bias current limit use in cost-sensitive, non-precision applications | Select when 2% tolerance and higher power dissipation margin are acceptable |
| AP431SASNTR-G1 | Same pinout, 0.5% VREF tolerance, lower temp drift (±2.5mV), but not recommended for new designs per Diodes datasheet | Higher accuracy at expense of long-term availability and design longevity | Avoid for new designs due to manufacturer's "not recommended" status and obsolescence risk |
Compared with TL431CDBVR and AP431SASNTR-G1, AS431IBNTR-G1 delivers superior thermal stability (±4.5mV vs. ±10mV) and lower minimum cathode current (10µA vs. 1mA), enabling precision regulation in low-power, wide-temperature industrial systems without sacrificing SOT-23 footprint compatibility.
Availability
AS431IBNTR-G1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger voltage regulation, and graphics card VRM reference applications requiring stable component supply, consistent parametric performance, and RoHS/Green compliance.
Supply support for AS431IBNTR-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 for industrial, computing, and consumer markets.
The AS431I series belongs to Diodes' precision shunt regulator product line, designed specifically for replacing Zener diodes in high-stability, low-drift voltage reference and feedback applications across automotive, telecom, and industrial power systems.
FAQ
What is the maximum cathode voltage rating for AS431IBNTR-G1?
The AS431IBNTR-G1 has an absolute maximum cathode-to-anode voltage (VKA) rating of 40V, with recommended continuous operation up to 36V. Exceeding 36V risks regulation instability and increased reference voltage drift; operation above 40V may cause permanent damage per Absolute Maximum Ratings.
Can AS431IBNTR-G1 operate with zero load current on the cathode?
No - AS431IBNTR-G1 requires a minimum cathode current of 10µA (typical) to maintain regulation. Below this threshold, the device exits regulation and output voltage collapses toward VREF. External circuitry must ensure ≥50µA (max spec) cathode current under all operating conditions.
How does the SOT-23 package affect thermal performance compared to TO-92?
The SOT-23 package has a junction-to-case thermal resistance of 113°C/W versus 68°C/W for TO-92, limiting its usable power dissipation to 370mW (vs. 770mW for TO-92). In high-current (>50mA) or high-ambient (>85°C) applications, board-level copper area and airflow become critical for thermal management.
Is AS431IBNTR-G1 compatible with existing TL431-based PCB layouts?
Yes - AS431IBNTR-G1 uses identical SOT-23 pinout (REF-ANODE-CATHODE) and shares functional equivalence with TL431, but requires verification of resistor divider values due to tighter 1.0% VREF tolerance and lower IREF (0.035µA vs. ~2µA). No layout change is needed if thermal and current limits are respected.
AS431IBNTR-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:
- ±1%
- 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
AS431IBNTR-G1 FAQ
1.How can I place an order for AS431IBNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431IBNTR-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 AS431IBNTR-G1 reliable?
The price and inventory of AS431IBNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431IBNTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431IBNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431IBNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431IBNTR-G1?
AS431IBNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431IBNTR-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 AS431IBNTR-G1?
For technical support, including AS431IBNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431IBNTR-G1 requirements.
6.How does Aetrix verify that AS431IBNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431IBNTR-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 AS431IBNTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431IBNTR-G1?
All AS431IBNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431IBNTR-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 AS431IBNTR-G1 part is unused and in its original packaging.
Return procedure for AS431IBNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431IBNTR-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
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LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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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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