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Diodes Incorporated AS431BRTR-G1
- Part No.:
- AS431BRTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AS431BRTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ SOT89
- Quantity:
- Payment:
- Shipping:
Inventory:933
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Product details
Overview
AS431BRTR-G1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1.0% reference voltage tolerance, 2.5V to 36V programmable output range, 0.15Ω typical dynamic impedance, and operation from –40°C to +125°C - used as a Zener diode replacement in switching power supplies, battery chargers, and precision voltage references.
For engineers reviewing the AS431BRTR-G1 datasheet, AS431BRTR-G1 pinout, AS431BRTR-G1 application, or AS431BRTR-G1 equivalent, this device serves as a thermally stable, low-noise, capacitive-load-tolerant shunt reference with sharp turn-on characteristics and 4.5mV typical reference deviation over full temperature range.
Technical Context
The AS431BRTR-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 architecture supports stable operation with up to 100µF load capacitance without oscillation across cathode voltages from 3.5V to 15V.
It operates as a two-quadrant device: sinking 1mA–100mA cathode current while maintaining <0.5Ω dynamic impedance and <2.7mV/V cathode voltage sensitivity (∆VREF/∆VKA), with reference input current below 4µA and off-state cathode leakage under 1.0µA at 36V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±1.0% - sets precise regulation threshold for external resistor network |
| Output Voltage Range | 2.5V to 36V - programmable via external R1/R2 divider without internal gain change |
| Dynamic Impedance | 0.15Ω typical - ensures minimal output voltage shift under load transients |
| Temp Coefficient | 20ppm/°C typical - guarantees ≤16mV total drift from –40°C to +125°C |
| Cathode Current Range | 1.0mA to 100mA - supports both low-power biasing and high-current shunt regulation |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial ambient environments |
| Thermal Resistance (SOT89) | 29.8°C/W - enables 1W+ dissipation capability with moderate heatsinking |
Pinout & Package
SOT89 package (3-pin, single-ended heat tab), RoHS-compliant and halogen-free "Green" construction. Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node sensing divided cathode voltage; sets regulation point at 2.5V |
| Pin 2 (CATHODE) | Regulated Output Node | Sinks adjustable current to maintain VREF across external divider; connects to supply rail |
| Pin 3 (ANODE) | Current Return Path | Completes shunt path to ground or low-side return; electrically tied to thermal tab in SOT89 |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reference | 2.5V–36V output set by two external resistors - eliminates need for multiple fixed-voltage parts |
| Capacitive Load Stability | No oscillation with ≥100µF ceramic or electrolytic output capacitance - simplifies EMI filtering |
| Low Temp Drift | 4.5mV typical deviation over –40°C to +125°C - reduces calibration burden in wide-temp designs |
| Low Noise Performance | Sub-10µVRMS output noise - preserves signal integrity in ADC reference and sensor bias applications |
| High Sink Capacity | 100mA continuous cathode current - supports direct feedback control in >1A SMPS designs |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Regulation |
|---|---|
Use Scenario: Primary-side feedback loop in isolated flyback converters where optocoupler-coupled voltage sensing is required. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 2.5V threshold to TL431-compatible optocoupler driver circuitry. Use Value: Enables ±1% output voltage accuracy across line/load/temperature with no secondary-side controller. |
Use Scenario: Constant-voltage stage in multi-stage Li-ion charger ICs or discrete linear charging circuits. IC Role / Device Role / Timing Role: Precision voltage clamp setting termination threshold (e.g., 4.2V per cell) via resistor divider. Use Value: Maintains charge cutoff accuracy within ±0.5% despite ambient shifts, preventing overcharge risk. |
| Programmable Voltage Adapter | Graphics Card VRM Reference |
Use Scenario: Field-configurable 5V/9V/12V USB PD adapter output stage using microcontroller-adjusted resistor ladder. IC Role / Device Role / Timing Role: Programmable shunt element in digitally tuned feedback network of buck converter controller. Use Value: Allows single-hardware design to support multiple output standards without component change. |
Use Scenario: Core voltage reference for GPU VRM phase controllers requiring tight tolerance under dynamic load steps. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source for multiphase PWM controller error amplifiers. Use Value: Reduces output voltage droop during 50A/µs load transients by stabilizing feedback loop DC operating point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | 0.5% initial tolerance, higher 0.22Ω typical ZKA, –40°C to +125°C rating | Preferred where tighter reference accuracy outweighs slightly higher impedance | Select when system-level voltage accuracy dominates transient response requirements |
| KA431AZTA | 1.0% tolerance, TO-92 package only, 81.9°C/W θJC, max 770mW power dissipation | Limited to low-power (<300mW) applications due to thermal constraints | Choose only for cost-sensitive, non-thermally-demanding legacy board replacements |
Compared with TL431BIDBVR and KA431AZTA, AS431BRTR-G1 delivers superior thermal performance in SOT89 (29.8°C/W), lower dynamic impedance (0.15Ω), and guaranteed stability with large capacitive loads - making it optimal for high-current, high-reliability power conversion.
Availability
AS431BRTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and programmable voltage adapters requiring stable component supply, RoHS/Green compliance, and production continuity.
Supply support for AS431BRTR-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 devices for power management, signal integrity, and connectivity applications.
The AS431 belongs to Diodes' precision reference product line, engineered for high-stability shunt regulation in power supply feedback, battery management, and industrial control systems where Zener diode limitations must be overcome.
FAQ
What is the minimum cathode current required for regulation in AS431BRTR-G1?
The AS431BRTR-G1 requires a minimum cathode current of 0.4mA to maintain regulation, with typical operation starting reliably at 1.0mA. This low IKA(Min) enables use in ultra-low-power bias networks and high-impedance feedback dividers without compromising stability.
Can AS431BRTR-G1 replace a standard Zener diode directly?
Yes - AS431BRTR-G1 replaces Zener diodes in 2.5V–36V applications with superior performance: sharper knee, lower tempco (20ppm/°C vs. 5000ppm/°C for 5.1V Zener), and stable regulation under capacitive loads where Zeners oscillate. External resistor divider is mandatory; no direct pin-for-pin drop-in.
Does AS431BRTR-G1 require an external capacitor for stability?
No external capacitor is required for basic regulation. The device remains stable with output capacitances up to 100µF across its operating voltage range (3.5V–15V cathode voltage), as verified in Diodes' DS36599 Figure 11. A 100nF ceramic bypass at REF is recommended for noise immunity.
What is the maximum power dissipation for AS431BRTR-G1 in SOT89 package?
In SOT89 package, AS431BRTR-G1 has a thermal resistance θJC of 29.8°C/W. With a maximum junction temperature of +150°C and ambient at +85°C, it supports up to ~2.2W continuous dissipation on a 2-layer PCB with 1in² copper pour - derated to 1.2W for conservative industrial designs.
AS431BRTR-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:
- 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-89-3
AS431BRTR-G1 FAQ
1.How can I place an order for AS431BRTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431BRTR-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 AS431BRTR-G1 reliable?
The price and inventory of AS431BRTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431BRTR-G1 is usually 5 days.
3.What payment methods are accepted for AS431BRTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431BRTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431BRTR-G1?
AS431BRTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431BRTR-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 AS431BRTR-G1?
For technical support, including AS431BRTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431BRTR-G1 requirements.
6.How does Aetrix verify that AS431BRTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS431BRTR-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 AS431BRTR-G1 meets industry standards.
7.What is the process for return or replacement of AS431BRTR-G1?
All AS431BRTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431BRTR-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 AS431BRTR-G1 part is unused and in its original packaging.
Return procedure for AS431BRTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431BRTR-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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