My Inquiry
My Account
Diodes Incorporated AZ431BN-ATRG1
- Part No.:
- AZ431BN-ATRG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431BN-ATRG1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,865
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AZ431BN-ATRG1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.8% reference voltage tolerance, 2.5V to 36V programmable output, and ±4.5mV typical temperature drift over –40°C to +125°C. It replaces Zener diodes in switching power supplies, battery chargers, and precision voltage references where low dynamic impedance (0.15Ω typical), sharp turn-on, and capacitive-load stability are required.
For engineers reviewing the AZ431BN-ATRG1 datasheet, AZ431BN-ATRG1 pinout, AZ431BN-ATRG1 application, or AZ431BN-ATRG1 equivalent, this device serves as a thermally stable, RoHS-compliant, green-packaged shunt reference with validated performance across automotive-grade ambient ranges and high-current sink capability up to 100mA.
Technical Context
The AZ431BN-ATRG1 operates as a two-input, one-output precision comparator-based shunt regulator: its internal reference (2.500V typ) compares against a resistor-divided cathode voltage, driving an NPN output stage to maintain regulation. It features a low 0.15Ω dynamic impedance and <1.0µA reference input current, enabling stable operation with load capacitances up to 100µF without oscillation.
Its thermal coefficient of 20ppm/°C typical and junction-to-ambient thermal resistance of 165°C/W (SOT89) support reliable operation in industrial and automotive environments. The device achieves regulation with only 0.4mA minimum cathode current and maintains <1.0µA off-state leakage at 36V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V typical, 0.8% initial tolerance (2.480–2.520V); sets precise regulation threshold for external resistor network. |
| Output Voltage Range | 2.5V to 36V programmable via external resistive divider; enables flexible system-level voltage setting without discrete Zeners. |
| Temperature Drift | ±4.5mV typical over –40°C to +125°C; ensures <0.2% total output variation across full industrial operating range. |
| Cathode Current Range | 1.0mA to 100mA continuous sink capability; supports high-current feedback paths in SMPS and charger ICs. |
| Dynamic Impedance | 0.15Ω typical at 1–100mA; provides stiff reference node under transient load changes, minimizing output ripple coupling. |
| Reference Input Current | 0.7–4.0µA typical; reduces divider power loss and improves accuracy in high-impedance feedback networks. |
| Operating Temperature | –40°C to +125°C ambient; qualified for under-hood automotive and industrial control applications. |
| Package | SOT89-3 green package; halogen- and antimony-free, RoHS 3 compliant, with 165°C/W θJA for thermal reliability. |
Pinout & Package
SOT89-3 package: 3-pin surface-mount outline with exposed thermal pad; compact footprint (4.6mm × 2.6mm) and low-profile (1.8mm height) optimized for space-constrained power rails.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Regulated output node | Connects to SMPS feedback point or voltage divider top; sinks current to maintain VREF at divider midpoint. |
| Pin 2 (Anode) | Current return path | Connected to ground or low-side return; completes regulation loop; handles full cathode current (up to 100mA). |
| Pin 3 (Reference) | Feedback sense input | High-impedance node tied to resistor divider midpoint; compares against internal 2.5V reference to drive output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable 2.5–36V output | Enables single BOM part across multiple output voltages in adapter and PSU designs, reducing inventory complexity. |
| 0.15Ω dynamic impedance | Minimizes output voltage deviation during fast load transients, improving stability in PWM-controlled converters. |
| Stable with ≥100µF capacitive loads | Eliminates need for external compensation in high-capacitance hold-up or filtering stages common in chargers. |
| –40°C to +125°C operation | Validated for under-dash automotive modules and industrial motor drives without derating or thermal margin loss. |
| Green SOT89-3 packaging | Halogen- and antimony-free molding compound meets strict environmental compliance for global OEM programs. |
Applications
| Switching Power Supply | Battery Charger |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated flyback or forward converters delivering 5V–24V outputs. IC Role / Device Role / Timing Role: Precision shunt reference providing error signal to optocoupler-driven primary controller. Use Value: 0.15Ω impedance and 20ppm/°C TC ensure <±0.5% output regulation across line/load/temperature, meeting Class II efficiency standards. |
Use Scenario: Constant-voltage stage in multi-cell Li-ion charger ICs or discrete CC/CV circuits. IC Role / Device Role / Timing Role: Adjustable reference setting termination voltage (e.g., 4.2V/cell × 3 = 12.6V) with tight thermal tracking. Use Value: ±4.5mV drift over –40°C to +125°C prevents overcharge risk in high-temp battery enclosures. |
| Voltage Adapter | Graphic Card VRM |
Use Scenario: Universal AC/DC adapter output regulation for USB-PD, laptop, or IoT power bricks. IC Role / Device Role / Timing Role: Programmable shunt element replacing fixed Zener in multi-output flyback secondary sensing. Use Value: Single-part flexibility across 9V/12V/15V/20V outputs reduces SKU count while maintaining ±0.8% initial accuracy. |
Use Scenario: Remote sensing reference for GPU core voltage (0.8–1.3V) in high-current VRMs. IC Role / Device Role / Timing Role: High-stability reference feeding into error amplifier of multiphase buck controller. Use Value: Low 0.7µA reference current minimizes divider error in milliohm-sense resistor networks, improving current-sharing accuracy. |
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% tolerance, SO-8 package, higher 2.5mV/K tempco, 0.22Ω ZKA | Larger footprint, less thermally efficient (θJA = 210°C/W), no green compliance | Preferred where tighter initial tolerance outweighs thermal and environmental requirements. |
| AS431AZTR-E1 | 0.8% tolerance, TO92 package, 200mA IKA max, 0.25Ω ZKA, -25°C to +85°C rating | Through-hole mounting, wider current range, but limited temperature range and no RoHS 3/green status | Selected for cost-sensitive, non-automotive consumer adapters with manual assembly. |
Compared with TL431BIDBZR and AS431AZTR-E1, AZ431BN-ATRG1 offers superior thermal robustness (125°C operation), lower dynamic impedance, and full halogen-free compliance-making it optimal for automotive and high-reliability industrial power designs where long-term stability and regulatory alignment are critical.
Availability
AZ431BN-ATRG1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger voltage termination, and graphic card VRM reference applications requiring stable component supply, consistent green packaging, and extended temperature qualification.
Supply support for AZ431BN-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 analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.
AZ431BN-ATRG1 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy, thermally stable voltage reference in power conversion systems where Zener replacement and RoHS 3 compliance are mandatory.
FAQ
What is the minimum cathode current required for regulation?
The AZ431BN-ATRG1 requires only 0.4mA minimum cathode current to maintain regulation, verified per datasheet Section 5 (Electrical Characteristics). This low threshold enables use in ultra-low-power feedback loops and high-resistance divider networks without compromising stability or accuracy.
Can AZ431BN-ATRG1 replace a standard Zener diode directly?
Yes-it functions as a 3-terminal drop-in replacement for Zener diodes in shunt regulator configurations. Unlike passive Zeners, it delivers sharp turn-on, lower dynamic impedance (0.15Ω vs. >10Ω), and guaranteed thermal stability across –40°C to +125°C, eliminating calibration drift in production units.
Does AZ431BN-ATRG1 require external compensation for stability?
No external compensation is needed: the device remains stable with capacitive loads up to 100µF, as confirmed in Figure 8 (Stability Boundary Conditions vs. Load Capacitance). Its internal design inherently suppresses oscillation in typical SMPS and charger feedback networks.
What does "Green" mean in the ATRG1 suffix?
"Green" denotes Diodes' halogen- and antimony-free molding compound: <900ppm bromine, <900ppm chlorine (<1500ppm total Br+Cl), and <1000ppm antimony compounds. This satisfies stringent environmental mandates including EU RoHS 3 and automotive OEM sustainability requirements.
AZ431BN-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:
- ±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-ATRG1 FAQ
1.How can I place an order for AZ431BN-ATRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BN-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 AZ431BN-ATRG1 reliable?
The price and inventory of AZ431BN-ATRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BN-ATRG1 is usually 5 days.
3.What payment methods are accepted for AZ431BN-ATRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BN-ATRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BN-ATRG1?
AZ431BN-ATRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BN-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 AZ431BN-ATRG1?
For technical support, including AZ431BN-ATRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BN-ATRG1 requirements.
6.How does Aetrix verify that AZ431BN-ATRG1 is sourced from the original manufacturer or authorized distributors?
All AZ431BN-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 AZ431BN-ATRG1 meets industry standards.
7.What is the process for return or replacement of AZ431BN-ATRG1?
All AZ431BN-ATRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BN-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 AZ431BN-ATRG1 part is unused and in its original packaging.
Return procedure for AZ431BN-ATRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431BN-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
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
