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Diodes Incorporated AZ431BZ-ATRE1
- Part No.:
- AZ431BZ-ATRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431BZ-ATRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,969
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Product details
Overview
AZ431BZ-ATRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.8% 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 voltage adapters, delivering low 0.15Ω dynamic impedance, 4.5mV typical reference deviation over temperature, and stable operation under capacitive loads up to 100µF.
For engineers reviewing the AZ431BZ-ATRE1 datasheet, AZ431BZ-ATRE1 pinout, AZ431BZ-ATRE1 application, or AZ431BZ-ATRE1 equivalent, key selection criteria include cathode voltage range (up to 36V), sink current capability (1–100mA), TO92 package compatibility, and RoHS-compliant lead-free construction for industrial and consumer power management designs.
Technical Context
The AZ431BZ-ATRE1 operates as a two-input (REF, ANODE), one-output (CATHODE) shunt reference with internal bandgap-derived 2.5V reference. Its feedback loop enables precise voltage regulation via external resistor dividers, supporting both fixed and adjustable configurations without requiring external compensation.
It features sharp turn-on characteristics and low 20ppm/°C typical temperature coefficient, enabling stable reference performance across automotive and industrial ambient ranges. The device maintains low output noise and high AC gain (>40dB at 1kHz), ensuring minimal regulation error in PWM feedback paths and precision current-source topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500V ±0.8% (2.480–2.520V); sets minimum regulated output when used with external resistors. |
| Cathode Voltage Range | 2.5V to 36V; defines maximum input headroom before breakdown or regulation loss. |
| Sink Current Range | 1mA to 100mA; determines compatible load current and external series resistor sizing. |
| Dynamic Impedance | 0.15Ω typical (≤0.5Ω max); ensures minimal output voltage shift under load transients. |
| Temp Coefficient | 20ppm/°C typical; guarantees ≤16mV total drift from −40°C to +125°C for stable long-term accuracy. |
| Operating Temp | −40°C to +125°C; supports deployment in extended-temperature industrial and automotive environments. |
| Package | TO92 (Ammo Packing); through-hole compatible with legacy PCB assembly and high-reliability thermal anchoring. |
Pinout & Package
AZ431BZ-ATRE1 uses the TO92 (Ammo Packing) package: 3-pin, through-hole, epoxy-molded, with 1.27mm lead pitch and 12.5mm body length. Thermal resistance θJA = 165°C/W enables >770mW power dissipation at room ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Anode connection | Connects to ground or low-side return path; forms reference node with REF pin. |
| Pin 2 (REF) | Reference input | High-impedance feedback node; voltage at this pin is regulated to 2.5V ±0.8%. |
| Pin 3 (CATHODE) | Cathode output | Current-sinking terminal; delivers regulated voltage to external load or feedback network. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Programmable from 2.5V to 36V using two external resistors-enables single BOM for multiple output rails. |
| Capacitive Load Stability | Stable with ≥100µF output capacitance-eliminates need for external compensation in adapter and charger designs. |
| Low Reference Drift | 4.5mV typical deviation over full temperature range-reduces calibration overhead in precision analog systems. |
| High Sink Current Capacity | 100mA continuous cathode current-supports direct driving of optocoupler LEDs or TL431 replacement circuits. |
| RoHS & Green Compliance | Totally lead-free, halogen- and antimony-free-meets IPC-1752A Class 2 reporting and EU RoHS 3 (2015/863/EU). |
Applications
| Switching Power Supply Feedback | Battery Charger Regulation |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.5V reference to optocoupler LED driver circuit. Use Value: Enables ±1% output regulation across line/load/temperature with no secondary-side controller IC required. |
Use Scenario: Constant-voltage stage control in multi-cell Li-ion battery chargers. IC Role / Device Role / Timing Role: Adjustable reference setting charge termination threshold (e.g., 4.2V/cell) via resistor divider. Use Value: Achieves <±5mV threshold accuracy over −20°C to +60°C, reducing cell overcharge risk. |
| Voltage Adapter Reference | Graphic Card VRM Monitoring |
|
Use Scenario: Low-cost 5V/12V DC-DC adapter for USB-C PD accessories or IoT gateways. IC Role / Device Role / Timing Role: Shunt-based reference for TL431-compatible feedback networks in buck regulators. Use Value: Pin-to-pin compatible drop-in replacement for TL431 with tighter 0.8% tolerance and lower temp drift. |
Use Scenario: GPU core voltage (VDDC) monitoring and margining in desktop graphics cards. IC Role / Device Role / Timing Role: Precision reference for ADC input scaling and DAC-controlled trim circuits. Use Value: Provides stable 2.5V reference for 12-bit ADCs, enabling ±10mV VDDC measurement resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 0.5% tolerance, SOIC-8 package, higher 0.2Ω ZKA, −40°C to +125°C rating | Requires surface-mount layout; lacks TO92 through-hole option | Select for higher-precision SMT designs where board space is constrained and 0.5% tolerance is mandatory. |
| AZ431AZ-AE1 | Same die, 0.4% tolerance, TO92 bulk packaging, identical pinout and thermal specs | Lower tolerance grade; same mechanical fit but tighter initial accuracy | Choose when system-level calibration budget allows tighter reference error and bulk packaging is preferred. |
Compared with TL431ACDR, AZ431BZ-ATRE1 offers TO92 through-hole compatibility and lower dynamic impedance; versus AZ431AZ-AE1, it trades 0.4% tolerance for cost-sensitive applications where ±0.8% meets system spec and ammo packing enables automated insertion.
Availability
AZ431BZ-ATRE1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and voltage adapter reference applications requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole assembly.
Supply support for AZ431BZ-ATRE1 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, computing, and consumer markets.
AZ431BZ-ATRE1 belongs to Diodes' precision shunt regulator product line, designed specifically for cost-effective, thermally robust voltage reference and feedback applications in isolated power converters and battery management systems.
FAQ
What is the minimum cathode current required for regulation in AZ431BZ-ATRE1?
The AZ431BZ-ATRE1 requires a minimum cathode current of 0.4mA (typical) and 1.0mA (max) to maintain regulation. This value is specified at VKA = VREF and ensures stable reference establishment during startup and light-load conditions in switching power supplies and adapters.
Can AZ431BZ-ATRE1 replace TL431 in existing designs?
Yes-AZ431BZ-ATRE1 is pin-compatible with TL431 in TO92 packages and shares identical electrical behavior: same 2.5V reference, three-terminal topology, and cathode-sink operation. Differences include 0.8% vs. 0.5% tolerance and slightly lower dynamic impedance (0.15Ω vs. 0.2Ω), making it a functional upgrade in most legacy TL431 applications.
What is the maximum power dissipation for AZ431BZ-ATRE1 in TO92 package?
In TO92 (Ammo Packing), AZ431BZ-ATRE1 has a maximum power dissipation of 770mW at 25°C ambient, based on its θJA = 165°C/W rating. Derating is required above 25°C: power must be reduced by 4.64mW/°C to avoid exceeding the +150°C junction limit.
Does AZ431BZ-ATRE1 require an external capacitor for stability?
No external capacitor is required for basic regulation. The device remains stable with output capacitance up to 100µF, as verified in the datasheet's stability boundary chart. However, a 1nF ceramic capacitor between REF and ANODE is recommended for high-noise environments to suppress RF coupling into the reference node.
AZ431BZ-ATRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431BZ-ATRE1 FAQ
1.How can I place an order for AZ431BZ-ATRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BZ-ATRE1 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 AZ431BZ-ATRE1 reliable?
The price and inventory of AZ431BZ-ATRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BZ-ATRE1 is usually 5 days.
3.What payment methods are accepted for AZ431BZ-ATRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BZ-ATRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BZ-ATRE1?
AZ431BZ-ATRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BZ-ATRE1 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 AZ431BZ-ATRE1?
For technical support, including AZ431BZ-ATRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BZ-ATRE1 requirements.
6.How does Aetrix verify that AZ431BZ-ATRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431BZ-ATRE1 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 AZ431BZ-ATRE1 meets industry standards.
7.What is the process for return or replacement of AZ431BZ-ATRE1?
All AZ431BZ-ATRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BZ-ATRE1, 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 AZ431BZ-ATRE1 part is unused and in its original packaging.
Return procedure for AZ431BZ-ATRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431BZ-ATRE1 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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