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Diodes Incorporated AN431BN-ATRG1
- Part No.:
- AN431BN-ATRG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AN431BN-ATRG1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:175,127
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Product details
Overview
AN431BN-ATRG1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1.0% reference voltage tolerance, 2.5V nominal VREF, 36V max cathode voltage, and 0.15Ω typical dynamic impedance. It operates from –40°C to +125°C and replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references.
For engineers reviewing the AN431BN-ATRG1 datasheet, AN431BN-ATRG1 pinout, AN431BN-ATRG1 application, or AN431BN-ATRG1 equivalent, key selection criteria include programmable output (2.5–36V), low temperature coefficient (20 ppm/°C typ), high capacitive load stability, sink current range (1–100 mA), and SOT-23 package compatibility with space-constrained PCB layouts.
Technical Context
The AN431BN-ATRG1 functions as a two-input error amplifier with internal 2.5V bandgap reference, comparing REF pin voltage against VREF to control cathode current. Its sharp turn-on and low output impedance enable stable regulation even under varying load and input conditions.
It supports both standard shunt regulation and high-current configurations via external transistor drive, and maintains stability with up to 100 µF capacitive loads across its full operating temperature range without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500 V ±1.0% - sets minimum programmable output voltage and defines regulation threshold accuracy |
| VKA max | 36 V - maximum cathode-to-anode voltage for safe operation in high-voltage feedback loops |
| ZKA | 0.15 Ω typical - ensures minimal output voltage deviation under dynamic load changes |
| IKA range | 1 mA to 100 mA - defines usable sink current window for stable regulation and thermal management |
| Temp coeff | 20 ppm/°C typical - guarantees <±16 mV VREF drift over –40°C to +125°C for precision reference designs |
| Operating temp | –40°C to +125°C - enables deployment in automotive under-hood and industrial power supply environments |
| Package | SOT-23 - surface-mount footprint compatible with automated assembly and high-density board layouts |
Pinout & Package
AN431BN-ATRG1 is housed in a RoHS-compliant, lead-free SOT-23 package (3-pin, 2.3 × 2.5 × 1.1 mm). Pin assignments are verified per Diodes Inc. DS37414 Rev. 3–2: 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 feedback voltage; sets regulation point when VREF = 2.5V |
| Pin 2 (CATHODE) | Current sink output | Carries regulated sink current; connects to power rail or error amplifier input in SMPS feedback networks |
| Pin 3 (ANODE) | Ground reference | Common return path for internal reference and external resistor network; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.5V to 36V via external resistor divider - eliminates need for multiple Zener values in BOM |
| Capacitive load stability | Stable with ≥100 µF load - simplifies EMI filtering and eliminates need for series damping resistors |
| Low temperature coefficient | 20 ppm/°C typical - reduces calibration drift in precision analog measurement front-ends |
| Low dynamic output resistance | 0.15 Ω typical - minimizes output ripple in high-frequency switching regulator feedback paths |
| Wide sink current range | 1–100 mA operation - supports direct regulation and transistor-driven high-current configurations |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Reference |
|---|---|
|
Use Scenario: Used in secondary-side feedback loop of isolated flyback converters to regulate output voltage with optocoupler interface. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise 2.5V reference to error amplifier input. Use Value: Enables ±1% output regulation over line, load, and temperature with minimal external components. |
Use Scenario: Sets constant-voltage threshold in Li-ion battery charging circuits with CC/CV profile control. IC Role / Device Role / Timing Role: Precision voltage reference defining termination voltage (e.g., 4.2V) via resistor scaling. Use Value: Ensures charge cutoff within ±0.042V tolerance, preventing overvoltage stress on cells. |
| Graphics Card VRM Monitoring | Industrial Sensor Signal Conditioning |
|
Use Scenario: Monitors GPU core voltage in real time by scaling down rail voltage into AN431's REF pin. IC Role / Device Role / Timing Role: High-stability shunt element converting scaled voltage to regulated current for ADC input. Use Value: Delivers <±0.5% measurement accuracy across –40°C to +85°C ambient, critical for thermal throttling logic. |
Use Scenario: Provides excitation reference for bridge-based pressure or strain sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference sourcing stable bias for Wheatstone bridges. Use Value: Reduces sensor offset drift to <10 µV/°C, enabling 16-bit effective resolution in 24-bit ADC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 2.5V VREF, 0.5% tolerance, SO-8 package, higher IKA max (100 mA), 0.22Ω ZKA | Requires larger PCB area; better for high-current, low-impedance feedback but less suitable for ultra-compact layouts | Select when tighter initial VREF tolerance (0.5%) is required and SO-8 assembly is acceptable |
| AS431ASTZTR-G1 | 2.5V VREF, 1.0% tolerance, SOT-23 package, 0.2Ω ZKA, –40°C to +125°C rating | Identical form factor and thermal range; slightly higher dynamic impedance affects ripple rejection | Choose for second-source availability with identical mounting and thermal profile, accepting minor ZKA trade-off |
Compared with TL431BIDBZR and AS431ASTZTR-G1, AN431BN-ATRG1 offers the lowest dynamic impedance (0.15Ω) in SOT-23, delivering superior transient response in compact power supplies where layout parasitics dominate performance.
Availability
AN431BN-ATRG1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and precision voltage references requiring stable component supply across automotive, industrial, and computing end markets.
Supply support for AN431BN-ATRG1 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 ICs, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.
The AN431 product line delivers precision shunt regulation for cost-sensitive, space-constrained power systems-designed specifically to replace Zener diodes while improving thermal stability and output accuracy.
FAQ
What is the minimum cathode current required for regulation in AN431BN-ATRG1?
The minimum cathode current (IKA(Min)) required for regulation is 0.4 mA typical and 1.0 mA maximum at 25°C, per DS37414 Rev. 3–2 Electrical Characteristics table. Below this threshold, the device exits regulation and VKA rises uncontrollably above VREF × (1 + R1/R2).
Can AN431BN-ATRG1 operate with a 100 µF output capacitor?
Yes-performance characterization in DS37414 Rev. 3–2 confirms stable operation with up to 100 µF capacitive load across all tested cathode voltages (VKA = VREF, 5V, 10V, 15V) and temperatures. No oscillation occurs, eliminating need for series damping resistors in most applications.
How does the 1.0% VREF tolerance affect output voltage accuracy in a typical application?
In a standard resistor-divider configuration (VOUT = VREF × (1 + R1/R2)), the 1.0% VREF tolerance contributes directly to output error. For example, at VOUT = 12V, it introduces ±0.12V baseline error before accounting for resistor tolerance and temperature drift.
Is AN431BN-ATRG1 pin-compatible with TL431 devices?
No-AN431BN-ATRG1 uses SOT-23 with REF/CATHODE/ANODE pinout (1/2/3), whereas TL431 variants use TO-92 (K/R/A) or SO-8 (1=REF, 2=ANODE, 3=CATHODE, 4–8 unused). Direct replacement requires PCB redesign due to differing pin mapping and package geometry.
AN431BN-ATRG1 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:
- 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
AN431BN-ATRG1 FAQ
1.How can I place an order for AN431BN-ATRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AN431BN-ATRG1 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 AN431BN-ATRG1 reliable?
The price and inventory of AN431BN-ATRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AN431BN-ATRG1 is usually 5 days.
3.What payment methods are accepted for AN431BN-ATRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AN431BN-ATRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AN431BN-ATRG1?
AN431BN-ATRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AN431BN-ATRG1 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 AN431BN-ATRG1?
For technical support, including AN431BN-ATRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AN431BN-ATRG1 requirements.
6.How does Aetrix verify that AN431BN-ATRG1 is sourced from the original manufacturer or authorized distributors?
All AN431BN-ATRG1 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 AN431BN-ATRG1 meets industry standards.
7.What is the process for return or replacement of AN431BN-ATRG1?
All AN431BN-ATRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AN431BN-ATRG1, 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 AN431BN-ATRG1 part is unused and in its original packaging.
Return procedure for AN431BN-ATRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AN431BN-ATRG1 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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