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Diodes Incorporated AZ431AN-BTRG1
- Part No.:
- AZ431AN-BTRG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431AN-BTRG1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,606
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Product details
Overview
AZ431AN-BTRG1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.4% reference voltage tolerance, 2.5V nominal VREF, and guaranteed thermal stability from –40°C to +125°C. It replaces Zener diodes in feedback loops of switching power supplies, battery chargers, and voltage adapters, delivering low 0.2Ω dynamic impedance and 4.5mV typical reference deviation over full temperature range.
For engineers reviewing the AZ431AN-BTRG1 datasheet, AZ431AN-BTRG1 pinout, AZ431AN-BTRG1 application, or AZ431AN-BTRG1 equivalent, this device serves as a programmable 2.5–18V precision voltage reference with sharp turn-on, high capacitive-load stability, and sink current capability up to 100mA - critical for closed-loop regulation in compact DC-DC converters and USB PD adapters.
Technical Context
The AZ431AN-BTRG1 operates as an adjustable shunt reference using an internal bandgap-derived 2.5V reference and high-gain error amplifier. Its cathode-anode-ref topology enables external resistor programming of output voltage via VOUT = (1 + R1/R2) × VREF, supporting both standard shunt regulation and high-current configurations with external pass transistors.
It features low 20ppm/°C typical temperature coefficient, sub-1µA reference input current, and stable operation with load capacitances up to 20µF - verified across –40°C to +125°C ambient without oscillation at VKA = 10V or 15V, making it suitable for automotive under-hood and industrial power rail monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500 V ±0.4% - sets precise regulation threshold; enables accurate 5V, 12V, or custom output voltages via external resistors |
| VKA Range | 2.5 V to 18 V - defines maximum cathode-to-anode operating voltage; supports wide-input buck/boost converters |
| IKA Range | 1 mA to 100 mA - determines minimum load for regulation and maximum shunt current handling without external transistor |
| ZKA | 0.2 Ω typical - ensures minimal output voltage drift under varying load current; critical for tight-regulation feedback paths |
| ΔVREF (–40°C to +125°C) | 4.5 mV typical - guarantees <0.2% total reference drift across full industrial temperature range |
| Temp Coefficient | 20 ppm/°C typical - provides predictable, linear reference shift with temperature; simplifies system-level compensation |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial SMPS, and outdoor power equipment |
Pinout & Package
This device is supplied in SOT-23 package (3-pin, surface-mount), with lead-free and RoHS-compliant construction per G1 suffix. The package measures 2.9 mm × 1.3 mm × 1.0 mm and features gull-wing leads for reflow compatibility.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode terminal | Connected to system ground or low-side return path; forms current sink path with cathode |
| 2 (Cathode) | Cathode terminal | Connected to regulated output node; sinks adjustable current to maintain VREF across R1–R2 divider |
| 3 (Ref) | Reference input | High-impedance node sensing divider voltage; regulates when VREF = 2.5V; draws only 0.7 µA typical |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.5 V to 18 V using two external resistors - eliminates need for multiple fixed-voltage references |
| Low temperature drift | 4.5 mV typical deviation over –40°C to +125°C - ensures stable regulation without calibration in harsh environments |
| Capacitive-load stability | Stable with ≥20 µF output capacitance - supports ceramic bulk caps in space-constrained switcher designs |
| Sharp turn-on characteristic | Fast regulation onset at VREF threshold - reduces startup delay and improves transient response in feedback loops |
| Low noise & impedance | 0.2 Ω dynamic impedance and low output noise - minimizes feedback loop perturbation in high-PSRR applications |
Applications
| Switching Power Supply | Battery Charger |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback or forward converters. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler feedback network, setting regulated output voltage. Use Value: Enables ±1% output accuracy across line/load/temperature with no secondary-side controller IC. |
Use Scenario: Constant-voltage stage control in USB-C PD or multi-cell Li-ion chargers. IC Role / Device Role / Timing Role: Adjustable reference for charger IC feedback or discrete op-amp-based CV loop. Use Value: Supports programmable charge voltage (e.g., 8.4 V for 2S, 12.6 V for 3S) with <0.5% total error. |
| Voltage Adapter | Graphic Card VRM |
Use Scenario: Low-cost AC/DC adapter or DC/DC module requiring 3.3 V, 5 V, or 12 V output. IC Role / Device Role / Timing Role: Shunt regulator in TL431-replacement topology with transformerless feedback. Use Value: Reduces BOM count by replacing Zener + transistor combo; achieves tighter tolerance than discrete solutions. |
Use Scenario: Remote sense reference for GPU core voltage (VDDC) tracking in desktop graphics cards. IC Role / Device Role / Timing Role: High-stability reference for multiphase buck controller feedback divider. Use Value: Maintains <±5 mV reference accuracy despite PCB thermal gradients near GPU die. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.5V VREF, 2% initial tolerance (vs. 0.4%), higher 50ppm/°C tempco, 0.5Ω ZKA | Acceptable for cost-sensitive consumer adapters where ±2% output tolerance is acceptable | Select when BOM cost priority outweighs regulation accuracy and thermal stability |
| AS431ASTU | 2.5V VREF, 0.5% tolerance, –40°C to +105°C rating (vs. +125°C), 0.3Ω ZKA | Limited to commercial-temp applications; not rated for extended industrial or automotive ambient | Choose only if full –40°C to +125°C operation is not required and footprint compatibility is confirmed |
Compared with TL431ACDBVR and AS431ASTU, AZ431AN-BTRG1 delivers superior thermal stability (20ppm/°C vs. 50ppm/°C), wider temperature range (+125°C vs. +105°C), and tighter initial tolerance (0.4% vs. 2% or 0.5%), making it optimal for high-accuracy, high-reliability power systems where long-term drift and ambient extremes matter.
Availability
AZ431AN-BTRG1 is available at Aetrix Electronics and suitable for switching power supply design, battery charging circuits, and voltage adapter development requiring stable component supply across industrial temperature grades and RoHS-compliant manufacturing.
Supply support for AZ431AN-BTRG1 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 power management, signal integrity, and protection devices for industrial, computing, and consumer markets.
AZ431AN-BTRG1 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy voltage reference and feedback applications in compact, thermally demanding power conversion systems.
FAQ
What is the minimum cathode current required for regulation in AZ431AN-BTRG1?
The minimum cathode current (IKA(Min)) required for regulation is 0.4 mA at TA = +25°C, rising to 1.0 mA maximum across –40°C to +125°C. This ensures reliable turn-on even at cold temperatures and allows use with high-value feedback resistors while maintaining loop stability.
Can AZ431AN-BTRG1 replace TL431 in existing designs?
Yes - AZ431AN-BTRG1 is pin-compatible with TL431 in SOT-23 package and shares identical anode-cathode-ref pinout. However, its tighter 0.4% VREF tolerance, lower temperature coefficient, and improved dynamic impedance provide measurable improvement in output accuracy and thermal drift without circuit modification.
What is the maximum capacitive load the AZ431AN-BTRG1 can drive stably?
The device remains stable with output capacitance up to 20 µF, as verified in the datasheet's stability boundary plot. This supports common ceramic or polymer bulk capacitors used in DC-DC outputs, eliminating need for series resistance or compensation networks in most applications.
Does AZ431AN-BTRG1 require external compensation components?
No external compensation is required for standard shunt regulator configurations. The internal amplifier is unity-gain stable with capacitive loads ≤20 µF. Only in high-frequency PWM converter feedback loops with >100 kHz bandwidth might minor phase compensation be considered - but not mandated by datasheet specifications.
AZ431AN-BTRG1 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.4%
- 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
AZ431AN-BTRG1 FAQ
1.How can I place an order for AZ431AN-BTRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AN-BTRG1 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 AZ431AN-BTRG1 reliable?
The price and inventory of AZ431AN-BTRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AN-BTRG1 is usually 5 days.
3.What payment methods are accepted for AZ431AN-BTRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AN-BTRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AN-BTRG1?
AZ431AN-BTRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AN-BTRG1 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 AZ431AN-BTRG1?
For technical support, including AZ431AN-BTRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AN-BTRG1 requirements.
6.How does Aetrix verify that AZ431AN-BTRG1 is sourced from the original manufacturer or authorized distributors?
All AZ431AN-BTRG1 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 AZ431AN-BTRG1 meets industry standards.
7.What is the process for return or replacement of AZ431AN-BTRG1?
All AZ431AN-BTRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AN-BTRG1, 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 AZ431AN-BTRG1 part is unused and in its original packaging.
Return procedure for AZ431AN-BTRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431AN-BTRG1 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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