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Diodes Incorporated AZ431BN-BTRE1
- Part No.:
- AZ431BN-BTRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431BN-BTRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,933
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Product details
Overview
AZ431BN-BTRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.8% 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 dynamic impedance (0.2Ω typ), sharp turn-on, and stable regulation under capacitive loads up to 10µF.
For engineers reviewing the AZ431BN-BTRE1 datasheet, AZ431BN-BTRE1 pinout, AZ431BN-BTRE1 application, or AZ431BN-BTRE1 equivalent, key selection criteria include its programmable output range (2.5V–18V), cathode current capability (1–100mA), temperature coefficient (20ppm/°C typ), and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The AZ431BN-BTRE1 operates as a two-input, one-output precision voltage reference comparator with internal bandgap reference and transconductance amplifier. Its REF pin senses external resistor divider voltage, while the cathode sinks current to maintain VREF at the divider node - enabling adjustable output via R1/R2 ratio per VOUT = VREF × (1 + R1/R2).
It features a low-noise, low-impedance output stage optimized for high-frequency stability with ≥10µF load capacitance, and exhibits minimal reference drift (<4.5mV over –40°C to +125°C) and cathode voltage sensitivity (ΔVREF/ΔVKA ≤ –2.7mV/V), making it suitable for closed-loop feedback in isolated DC-DC converters and precision current sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500V ±0.8% (2.480–2.520V) - sets minimum output voltage and defines feedback accuracy baseline |
| VKA Max | 18V - maximum cathode-to-anode voltage for safe operation in high-side sensing applications |
| IKA Range | 1.0–100mA - sink current capacity determines usable load range and power dissipation margin |
| ZKA | 0.2–0.5Ω (f ≤ 1kHz) - low dynamic impedance ensures stable regulation under transient load steps |
| Temp Coeff | 20ppm/°C typical - enables <±10mV total drift across –40°C to +125°C ambient |
| ΔVREF/ΔVKA | –0.5 to –2.7mV/V - quantifies reference voltage sensitivity to cathode voltage variation in high-impedance feedback networks |
| Operating Temp | –40°C to +125°C - supports industrial and automotive under-hood environments without derating |
Pinout & Package
AZ431BN-BTRE1 is packaged in SOT-23 (3-pin, JEDEC TO-236AB), with pin 1 = REF, pin 2 = ANODE, pin 3 = CATHODE. The anode must be connected to system ground or lowest potential node; cathode connects to regulated output node; REF senses feedback divider midpoint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | Senses voltage from external resistor divider; regulates when equal to internal 2.5V bandgap reference |
| Pin 2 (ANODE) | Anode terminal | Connected to GND or lowest system potential; forms return path for cathode sink current |
| Pin 3 (CATHODE) | Cathode output | Sinks current to maintain REF voltage; connects to output node or optocoupler LED anode in isolated SMPS |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5V to 18V via external resistive divider - eliminates need for multiple fixed-voltage references |
| Thermal stability | ≤4.5mV deviation over –40°C to +125°C - ensures consistent regulation across environmental extremes |
| Capacitive load immunity | Stable with ≥10µF ceramic output capacitance - simplifies EMI filtering and eliminates need for series damping resistors |
| Low reference current | 0.7–4µA typical - minimizes divider power loss and enables high-resistance feedback networks |
| High sink current | 100mA max continuous cathode current - supports direct drive of optocouplers and error amplifiers in multi-output converters |
Applications
| Switching Power Supply | Battery Charger |
|---|---|
Use Scenario: Secondary-side voltage regulation in isolated flyback or forward converters using optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5V threshold for TL431-compatible optocoupler biasing. Use Value: Enables ±1% output voltage accuracy over line, load, and temperature with no additional compensation components. |
Use Scenario: Constant-voltage/constant-current control loop in USB PD or Li-ion charger ICs. IC Role / Device Role / Timing Role: Adjustable reference for voltage sense comparator and current-sense amplifier thresholds. Use Value: Supports programmable charge termination voltages (e.g., 4.2V, 4.35V) with <±5mV drift across operating temperature. |
| Voltage Adapter | Graphic Card VRM |
Use Scenario: Low-cost AC-DC adapter with adjustable output (5V/9V/12V) using single transformer winding. IC Role / Device Role / Timing Role: Programmable shunt regulator setting output voltage via front-panel potentiometer-adjusted divider. Use Value: Eliminates need for multiple Zener diodes or dedicated voltage-select ICs; reduces BOM count by 2–3 parts. |
Use Scenario: Remote sensing and margining reference in GPU voltage regulator modules (VRMs). IC Role / Device Role / Timing Role: High-stability reference for DAC-controlled offset injection into VRM feedback node. Use Value: Provides <±0.5% voltage margining accuracy over –40°C to +105°C junction temperature range. |
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 | 0.5% VREF tolerance, higher IREF (1µA min), SOT-23-3 package - tighter initial accuracy but less thermal drift margin | Preferred in cost-sensitive consumer adapters where ±1% output tolerance suffices | Select when tighter initial VREF spec outweighs extended temperature stability requirements |
| AS431AMTR-E1 | 0.4% VREF tolerance, lower ZKA (0.15Ω typ), same SOT-23-3 footprint - superior dynamic regulation but limited cathode voltage rating (16V) | Suitable for low-voltage DC-DC modules (≤12V output) requiring ultra-low noise and fast transient response | Choose for sub-12V systems needing best-in-class impedance and accuracy, not for 15–18V rails |
Compared with TL431BIDBZR and AS431AMTR-E1, AZ431BN-BTRE1 trades minor initial accuracy for superior thermal stability (4.5mV drift vs. 6–8mV) and higher cathode voltage rating (18V), making it optimal for industrial power supplies operating across wide ambient ranges.
Availability
AZ431BN-BTRE1 is available at Aetrix Electronics and suitable for switching power supply design, battery charger development, and voltage adapter prototyping requiring stable component supply with full industrial temperature support.
Supply support for AZ431BN-BTRE1 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 consumer markets.
AZ431BN-BTRE1 belongs to Diodes' precision reference product line, engineered specifically for high-stability shunt regulation in feedback-critical power conversion systems where Zener replacement and thermal robustness are primary design goals.
FAQ
What is the minimum cathode current required for regulation in AZ431BN-BTRE1?
The minimum cathode current (IKA(Min)) is 0.4mA at TA = 25°C and increases to 1.0mA across the full –40°C to +125°C range. This ensures reliable turn-on and regulation stability even at extreme temperatures, critical for cold-start operation in outdoor power equipment.
Can AZ431BN-BTRE1 replace a standard Zener diode directly in existing designs?
Yes - AZ431BN-BTRE1 uses identical SOT-23-3 pinout (REF-ANODE-CATHODE) and matches common Zener footprints. Its sharp turn-on and low dynamic impedance eliminate Zener's soft knee and high impedance issues, improving regulation accuracy without layout changes.
How does the 0.8% VREF tolerance affect output voltage accuracy in a typical feedback network?
With VOUT = VREF × (1 + R1/R2), the 0.8% VREF tolerance contributes directly to overall output error. For a 5V output (R1/R2 = 1), total error remains ≤±1.2% when combined with 0.5% resistor tolerances - sufficient for most industrial power supplies without trimming.
Is AZ431BN-BTRE1 RoHS compliant and lead-free?
Yes - the "E1" suffix denotes RoHS-compliant, lead-free construction per Diodes Incorporated's specification. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering up to 260°C peak temperature.
AZ431BN-BTRE1 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:
- ±0.8%
- 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
AZ431BN-BTRE1 FAQ
1.How can I place an order for AZ431BN-BTRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BN-BTRE1 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 AZ431BN-BTRE1 reliable?
The price and inventory of AZ431BN-BTRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BN-BTRE1 is usually 5 days.
3.What payment methods are accepted for AZ431BN-BTRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BN-BTRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BN-BTRE1?
AZ431BN-BTRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BN-BTRE1 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 AZ431BN-BTRE1?
For technical support, including AZ431BN-BTRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BN-BTRE1 requirements.
6.How does Aetrix verify that AZ431BN-BTRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431BN-BTRE1 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 AZ431BN-BTRE1 meets industry standards.
7.What is the process for return or replacement of AZ431BN-BTRE1?
All AZ431BN-BTRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BN-BTRE1, 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 AZ431BN-BTRE1 part is unused and in its original packaging.
Return procedure for AZ431BN-BTRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431BN-BTRE1 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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