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Diodes Incorporated AS431IBRTR-G1
- Part No.:
- AS431IBRTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AS431IBRTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,793
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Product details
Overview
AS431IBRTR-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 AS431IBRTR-G1 datasheet, AS431IBRTR-G1 pinout, AS431IBRTR-G1 application, or AS431IBRTR-G1 equivalent, this device supports programmable output voltages from 2.5V to 36V, delivers stable regulation under capacitive loads up to 100µF, maintains low temperature deviation (4.5mV typical over full range), and operates reliably across industrial ambient conditions.
Technical Context
The AS431IBRTR-G1 functions as a two-input, one-output precision shunt reference: its REF terminal senses a fraction of cathode voltage via external resistive divider, while ANODE connects to system ground and CATHODE sinks current to regulate output. Its internal bandgap reference and error amplifier deliver sharp turn-on characteristics and low dynamic impedance (0.15Ω typical).
It operates in closed-loop shunt mode with sink current capacity from 50µA to 100mA, exhibits negligible reference current drift (0.3µA max over -40°C to +125°C), and maintains stable performance with load capacitance up to 100µF without oscillation-enabling direct integration into feedback networks of DC-DC converters and linear regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500 V ±1.0% at +25°C - sets precise regulation threshold for external resistor divider |
| VKA Max | 36 V - defines maximum adjustable output voltage when used with R1/R2 network |
| IKA(Min) | 10 µA typical / 50 µA max - enables regulation with ultra-low bias current in standby modes |
| ZKA | 0.15 Ω typical - ensures minimal output voltage shift under load transients |
| ΔVREF Temp | 4.5 mV typical over -40°C to +125°C - guarantees <0.2% total reference drift in industrial environments |
| θJC | 29 °C/W (SOT-89) - supports 770 mW power dissipation with moderate heatsinking |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive, industrial PSU, and embedded computing applications |
Pinout & Package
AS431IBRTR-G1 is packaged in SOT-89 (Option 1), with 3-pin surface-mount outline measuring 4.40–4.60 mm × 2.30–2.60 mm × 1.20–1.40 mm. Thermal pad on leadframe enhances power handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | Senses divided cathode voltage; high-impedance node requiring ≤0.5µA input current |
| 2 (ANODE) | Ground Reference | Connects to system ground; establishes return path for reference and cathode currents |
| 3 (CATHODE) | Regulated Output Terminal | Sinks adjustable current to maintain VOUT = VREF × (1 + R1/R2); handles up to 100mA continuous |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.5V to 36V via external R1/R2 divider - eliminates need for multiple fixed-voltage references |
| Low Minimum Cathode Current | 10µA typical - enables regulation in ultra-low-power sleep states and energy-harvesting circuits |
| High Capacitive Load Stability | Stable with ≥100µF output capacitance - removes need for isolation resistors in SMPS feedback loops |
| Low Temperature Drift | 4.5mV typical ΔVREF over -40°C to +125°C - ensures <0.2% output variation without calibration |
| Lead-Free & Green Compliance | RoHS 3 compliant, halogen- and antimony-free - meets IPC-1752A material declaration requirements |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Regulation |
|---|---|
|
Use Scenario: Primary-side feedback loop in isolated flyback converters for AC/DC adapters. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise VOUT sensing and error amplification via optocoupler-coupled feedback. Use Value: Enables ±1% output accuracy across line/load/temperature with no secondary-side controller, reducing BOM count by one IC. |
Use Scenario: Constant-voltage stage in multi-stage Li-ion charger ICs or discrete charge controllers. IC Role / Device Role / Timing Role: Precision voltage clamp setting termination threshold (e.g., 4.2V per cell) during CC/CV charging. Use Value: Maintains <±5mV reference accuracy over -20°C to +60°C battery temperature range, preventing overcharge. |
| Graphics Card VRM Reference | Industrial Sensor Signal Conditioning |
|
Use Scenario: Remote sensing reference for GPU core voltage (VDDC) regulation in PCIe graphics cards. IC Role / Device Role / Timing Role: High-stability shunt reference feeding into multiphase controller's feedback comparator. Use Value: Delivers 0.15Ω dynamic impedance to suppress noise-induced voltage droop during GPU load transients. |
Use Scenario: Excitation reference for bridge-based pressure/strain sensors in factory automation modules. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source powering Wheatstone bridge and ADC reference inputs. Use Value: 4.5mV max VREF drift over -40°C to +85°C eliminates need for sensor-specific calibration tables. |
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 VREF, ±2% tolerance, 0.2Ω ZKA, SOT-23 package only | Limited to ≤37V VKA; higher min IKA (100µA); lower thermal rating (350mW) | Select for cost-sensitive consumer designs where 2% tolerance and SOT-23 footprint are acceptable |
| AP431SAG-13 | 2.5V VREF, ±0.5% tolerance, 0.12Ω ZKA, same SOT-89-3 package | Lower temp drift (3.5mV typ), higher IKA rating (150mA), but not RoHS 3/halogen-free | Choose for highest-precision industrial systems requiring tighter VREF tolerance and higher current headroom |
Compared with TL431CDBVR and AP431SAG-13, AS431IBRTR-G1 uniquely balances 1.0% VREF tolerance, RoHS 3/green compliance, 100mA sink capability, and proven stability with >100µF capacitive loads-making it optimal for automotive-qualified and long-lifecycle industrial power designs.
Availability
AS431IBRTR-G1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger voltage regulation, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AS431IBRTR-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 automotive markets.
The AS431I series belongs to Diodes' precision voltage reference product line, engineered specifically for shunt-regulator replacement in space-constrained, thermally demanding power conversion systems where Zener diodes lack stability and accuracy.
FAQ
What is the minimum cathode current required for regulation in AS431IBRTR-G1?
The AS431IBRTR-G1 requires a minimum cathode current of 10µA typical (50µA maximum) to maintain regulation. This ultra-low threshold enables operation in standby or low-power modes where traditional shunt regulators draw excessive current, making it ideal for energy-efficient adapters and always-on IoT power rails.
Can AS431IBRTR-G1 replace a standard Zener diode directly?
Yes-AS431IBRTR-G1 replaces Zener diodes in 2.5V–36V adjustable configurations using just two external resistors. Unlike Zeners, it provides sharp turn-on, low temperature coefficient (4.5mV typical drift), and stable regulation under capacitive loads without series damping resistors, simplifying layout and improving transient response.
Which package variant does AS431IBRTR-G1 use?
AS431IBRTR-G1 uses the SOT-89-3 package (Option 1 pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE), with dimensions 4.40–4.60 mm × 2.30–2.60 mm × 1.20–1.40 mm and an exposed thermal pad for enhanced power dissipation up to 770 mW.
Does AS431IBRTR-G1 support operation at 125°C ambient temperature?
Yes-AS431IBRTR-G1 is fully specified from -40°C to +125°C ambient temperature, with guaranteed electrical parameters including VREF tolerance, IKA(Min), and ΔVREF drift across this full range. Its 29°C/W junction-to-case thermal resistance allows reliable operation at 125°C with appropriate PCB copper area.
AS431IBRTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- 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-89-3
AS431IBRTR-G1 FAQ
1.How can I place an order for AS431IBRTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431IBRTR-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 AS431IBRTR-G1 reliable?
The price and inventory of AS431IBRTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431IBRTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431IBRTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431IBRTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431IBRTR-G1?
AS431IBRTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431IBRTR-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 AS431IBRTR-G1?
For technical support, including AS431IBRTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431IBRTR-G1 requirements.
6.How does Aetrix verify that AS431IBRTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431IBRTR-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 AS431IBRTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431IBRTR-G1?
All AS431IBRTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431IBRTR-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 AS431IBRTR-G1 part is unused and in its original packaging.
Return procedure for AS431IBRTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431IBRTR-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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