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Diodes Incorporated AS431ANTR-E1
- Part No.:
- AS431ANTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AS431ANTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
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Product details
Overview
AS431ANTR-E1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.5% reference voltage tolerance, 2.5V to 36V programmable output, and guaranteed thermal stability from −40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references, delivering 0.15Ω typical dynamic impedance and 4.5mV max reference deviation over full temperature range.
For engineers reviewing the AS431ANTR-E1 datasheet, AS431ANTR-E1 pinout, AS431ANTR-E1 application, or AS431ANTR-E1 equivalent, key selection criteria include its 100mA sink current capability, low 0.7µA typical reference input current, RoHS-compliant SOT23 package, and compatibility with capacitive loads up to 100µF without oscillation.
Technical Context
The AS431ANTR-E1 implements a bandgap-based precision reference core with sharp turn-on characteristics and low output impedance, enabling stable regulation across wide cathode voltage (2.5V–36V) and load current (1mA–100mA) ranges. Its internal architecture supports high stability under capacitive loading and exhibits minimal temperature-induced drift.
It operates as a two-input, one-output shunt control element: the REF pin senses voltage via external resistor divider, while the CATHODE sinks adjustable current to maintain VREF = 2.500V ±12.5mV (0.5%). The ANODE serves as the common return path, and the device requires no external compensation for stability up to 100µF load capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±12.5 mV (0.5% tolerance); sets precise regulation point for external resistor divider networks |
| Output Voltage Range | 2.5 V to 36 V; programmable via external resistive divider without additional components |
| Cathode Current Range | 1 mA to 100 mA; supports both low-power biasing and high-current shunt regulation |
| Dynamic Impedance | 0.15 Ω typical at 10 mA; ensures minimal output voltage variation under load transients |
| Temperature Coefficient | 20 ppm/°C typical; guarantees <±4.5 mV total drift from −40°C to +125°C |
| Reference Input Current | 0.7 µA typical; reduces divider power loss and improves efficiency in high-impedance feedback networks |
| Operating Temperature | −40°C to +125°C ambient; qualified for industrial and automotive under-hood environments |
Pinout & Package
SOT23-3L package: compact surface-mount outline (2.9 × 1.3 × 1.0 mm), lead-free and RoHS-compliant, optimized for automated assembly and thermal performance (θJC = 135.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance sensing node for external resistor divider; sets regulation threshold at 2.500 V |
| Pin 2 (CATHODE) | Current Sink Output | Primary current-handling terminal; sinks up to 100 mA to maintain regulated voltage at REF |
| Pin 3 (ANODE) | Common Return | Low-impedance ground reference for internal circuitry and external feedback network |
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 |
| Capacitive Load Stability | Stable with ≥100 µF ceramic or electrolytic output capacitance; removes need for external compensation |
| Low Reference Current | 0.7 µA typical at 25°C; enables high-resistance feedback dividers to minimize quiescent power |
| Wide Operating Temperature | −40°C to +125°C; supports deployment in industrial power supplies and automotive charging modules |
| Low Output Noise | Sub-10 µVRMS broadband noise; preserves signal integrity in precision analog feedback paths |
Applications
| Switching Power Supply Feedback | Battery Charger Regulation |
|---|---|
|
Use Scenario: Primary-side voltage feedback in isolated flyback converters using optocoupler-coupled error amplification. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5V threshold for TL431-compatible optocoupler driver circuits. Use Value: Enables ±1% output voltage accuracy across line/load/temperature with no trimming required. |
Use Scenario: Constant-voltage stage regulation in multi-cell Li-ion battery chargers with discrete MOSFET pass elements. IC Role / Device Role / Timing Role: Adjustable shunt regulator controlling gate drive of series-pass transistor to clamp battery voltage. Use Value: Delivers 0.5% reference accuracy and thermal stability to prevent overcharge across −10°C to +60°C ambient. |
| Voltage Adapter Reference | Graphics Card VRM Monitoring |
|
Use Scenario: Output voltage setting and monitoring in DC-DC step-down adapters for FPGA or ASIC core rails. IC Role / Device Role / Timing Role: Programmable reference for external comparator-based overvoltage protection and trim circuits. Use Value: Supports field-adjustable output (e.g., 0.85V–1.2V) with <±5mV drift over temperature, reducing BOM count. |
Use Scenario: Secondary-side voltage supervision in GPU voltage regulator modules requiring tight tolerance and fast transient response. IC Role / Device Role / Timing Role: Low-noise shunt reference feeding ADC input or comparator for real-time rail health monitoring. Use Value: Sub-10µV RMS noise and 0.15Ω impedance ensure accurate measurement during high di/dt GPU load transients. |
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 | 2.5V reference, 1% tolerance, higher 2.0µA max IREF, 0.2Ω ZKA | Wider industry adoption but looser initial accuracy and higher reference current | Select when cost sensitivity outweighs need for 0.5% tolerance and ultra-low IREF |
| KA431AZTA | 2.5V reference, 2% tolerance, TO-92 package, 100µA max IREF, 0.5Ω ZKA | Through-hole mounting, higher thermal resistance (81.9°C/W), lower accuracy | Select only for legacy through-hole designs where SOT23 rework is prohibitive |
Compared with TL431ACDBVR and KA431AZTA, the AS431ANTR-E1 offers tighter 0.5% reference tolerance, 3× lower reference current, and superior thermal performance in SOT23 - making it optimal for space-constrained, high-accuracy, low-quiescent-power applications.
Availability
AS431ANTR-E1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and voltage adapter reference applications requiring stable component supply, RoHS compliance, and long-term industrial lifecycle support.
Supply support for AS431ANTR-E1 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 ICs, with design and manufacturing operations across Asia and the Americas.
The AS431 belongs to Diodes' precision reference product line, engineered for high-accuracy, thermally stable shunt regulation in power management systems where Zener replacement and programmability are critical.
FAQ
What is the minimum cathode current required for regulation in AS431ANTR-E1?
The AS431ANTR-E1 requires a minimum cathode current of 0.4 mA to maintain regulation, per datasheet Electrical Characteristics table. This low turn-on threshold enables stable operation even with high-value feedback resistors or light-load conditions, reducing standby power consumption in energy-sensitive designs.
Can AS431ANTR-E1 replace TL431 in existing designs without layout changes?
Yes - AS431ANTR-E1 uses the same SOT23-3L pinout (REF-CATHODE-ANODE) and identical functional behavior as TL431, supporting direct drop-in replacement. However, its 0.5% tolerance and lower reference current may require minor feedback resistor recalibration to preserve exact output voltage.
Does AS431ANTR-E1 require an external capacitor for stability?
No external capacitor is required for stability. The AS431ANTR-E1 remains stable with capacitive loads up to 100 µF, as verified in the datasheet's "Stability Boundary Conditions vs. Load Capacitance" plot. This eliminates compensation components and simplifies PCB layout in high-capacitance output applications.
What is the maximum cathode-to-anode voltage rating for AS431ANTR-E1?
The absolute maximum cathode-to-anode voltage (VKA) is 40 V, with recommended operating limit at 36 V. Exceeding 40 V risks permanent damage, and operation above 36 V violates recommended conditions - design margins should maintain VKA ≤ 33 V for reliability in transient-prone environments.
AS431ANTR-E1 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:
- 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-23-3
AS431ANTR-E1 FAQ
1.How can I place an order for AS431ANTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS431ANTR-E1 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 AS431ANTR-E1 reliable?
The price and inventory of AS431ANTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS431ANTR-E1 is usually 5 days.
3.What payment methods are accepted for AS431ANTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS431ANTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS431ANTR-E1?
AS431ANTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS431ANTR-E1 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 AS431ANTR-E1?
For technical support, including AS431ANTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS431ANTR-E1 requirements.
6.How does Aetrix verify that AS431ANTR-E1 is sourced from the original manufacturer or authorized distributors?
All AS431ANTR-E1 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 AS431ANTR-E1 meets industry standards.
7.What is the process for return or replacement of AS431ANTR-E1?
All AS431ANTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS431ANTR-E1, 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 AS431ANTR-E1 part is unused and in its original packaging.
Return procedure for AS431ANTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS431ANTR-E1 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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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