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Diodes Incorporated AZ431BZ-ATRG1
- Part No.:
- AZ431BZ-ATRG1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431BZ-ATRG1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,890
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Product details
Overview
AZ431BZ-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 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 full temperature range, and stable operation under capacitive loads up to 100μF.
For engineers reviewing the AZ431BZ-ATRG1 datasheet, AZ431BZ-ATRG1 pinout, AZ431BZ-ATRG1 application, or AZ431BZ-ATRG1 equivalent, key selection criteria include cathode voltage range (up to 36V), sink current capability (1–100mA), TO92 package compatibility, RoHS-compliant "Green" molding compound, and thermal resistance of 165°C/W (TO92).
Technical Context
The AZ431BZ-ATRG1 operates as a two-input (REF, ANODE), one-output (CATHODE) shunt reference with internal bandgap-derived 2.5V reference and high-gain error amplifier. Its sharp turn-on characteristic and low 20ppm/°C typical temperature coefficient enable precise feedback control in isolated DC-DC converters and adjustable linear regulators.
It functions as a programmable voltage comparator driving an NPN pass transistor stage, sinking cathode current proportional to the difference between external resistor-divider voltage and internal VREF. Stability is maintained across load capacitance (0–100μF) and ambient temperature (−40°C to +125°C) without external compensation.
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 voltage headroom before breakdown or regulation loss. |
| Sink Current Range | 1mA to 100mA; determines compatible feedback resistor values and power dissipation capability. |
| Dynamic Impedance | 0.15Ω typical at 1–100mA; ensures minimal output voltage variation under load transients. |
| Temp. Coefficient | 20ppm/°C typical; guarantees ≤0.9mV drift over 45°C ambient change (e.g., industrial environments). |
| Ref. Deviation (−40 to +125°C) | ≤16mV; enables stable 5V or 12V reference generation without trimming in wide-temp applications. |
| Off-State Cathode Current | ≤1.0μA at VKA = 36V; minimizes quiescent power loss in standby or shutdown modes. |
Pinout & Package
Package: TO92 (Ammo Packing), 3-pin through-hole, RoHS-compliant and halogen-free "Green" compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Anode connection | Connected to ground or low-side return path; completes shunt current loop. |
| Pin 2 (REF) | Reference input | High-impedance node sensing external resistor divider; sets regulation point via VREF × (1 + R1/R2). |
| Pin 3 (CATHODE) | Cathode output | Sinks adjustable current to maintain voltage at REF pin; connects to supply rail or feedback node. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.5V to 36V via two-resistor divider - eliminates need for multiple fixed-voltage references. |
| Capacitive load stability | Stable with 0–100μF output capacitance - supports ceramic and electrolytic caps without phase compensation. |
| Low temperature drift | 4.5mV typical deviation over −40°C to +125°C - enables untrimmed designs in automotive under-hood or industrial enclosures. |
| Lead-free & Green packaging | TO92 ammo pack with <900ppm Br/Cl and <1000ppm Sb - meets EU RoHS 3 and environmental compliance mandates. |
| High sink current capacity | 100mA continuous cathode current - supports high-gain optocoupler drivers in isolated flyback feedback loops. |
Applications
| Switching Power Supply Feedback | Battery Charger Voltage Regulation |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback or forward converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 2.5V reference to optocoupler LED driver circuit. Use Value: Enables ±1% output voltage accuracy across line/load/temperature without secondary-side LDO or trimming. |
Use Scenario: Constant-voltage stage in multi-stage Li-ion or lead-acid battery charger ICs or discrete designs. IC Role / Device Role / Timing Role: Precision voltage threshold detector setting charge termination voltage (e.g., 4.2V per cell). Use Value: Maintains ≤0.8% voltage setpoint accuracy over full battery temperature range (−10°C to +45°C). |
| Voltage Adapter Reference | Graphic Card VRM Monitoring |
|
Use Scenario: Output voltage adjustment in universal AC-DC adapters supporting multiple USB-PD or proprietary fast-charge profiles. IC Role / Device Role / Timing Role: Programmable reference for DAC-controlled feedback resistor network in digitally adjustable SMPS. Use Value: Allows single hardware platform to support 5V/9V/12V/15V/20V outputs with <1% regulation error. |
Use Scenario: GPU core voltage (VDDC) monitoring and fine-tuning in high-performance graphics cards. IC Role / Device Role / Timing Role: High-stability reference for analog-to-digital converter inputs measuring VRM output. Use Value: Delivers <2mV measurement uncertainty over GPU junction temperature swings (0–105°C), enabling accurate thermal throttling. |
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% initial tolerance, SO-8 package, higher 0.25Ω dynamic impedance, −40°C to +125°C rating. | Requires PCB real estate for surface-mount SO-8; less suitable for through-hole legacy designs or high-vibration environments. | Preferred where tighter initial accuracy and board space allow SMT placement. |
| KA431AZTA | 2% initial tolerance, TO92 package, 100ppm/°C tempco, −20°C to +70°C operating range. | Limited temperature range and higher drift reduce suitability for automotive or industrial use. | Cost-optimized option only for commercial-grade, room-temperature applications. |
Compared with TL431BIDBZR and KA431AZTA, AZ431BZ-ATRG1 delivers superior thermal stability (20ppm/°C vs. 100ppm/°C) and wider temperature coverage (−40°C to +125°C) in a drop-in TO92 footprint, making it optimal for ruggedized power systems requiring long-term calibration retention.
Availability
AZ431BZ-ATRG1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger voltage regulation, and voltage adapter reference applications requiring stable component supply, RoHS-3 compliance, and through-hole manufacturability.
Supply support for AZ431BZ-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
AZ431BZ-ATRG1 belongs to the AZ431-A family of adjustable shunt regulators designed for high-accuracy, thermally stable voltage reference in cost-sensitive, high-volume power conversion systems.
FAQ
What is the maximum cathode voltage the AZ431BZ-ATRG1 can regulate?
The AZ431BZ-ATRG1 supports cathode voltages up to 36V under recommended operating conditions, with an absolute maximum rating of 40V. Operation above 36V risks loss of regulation accuracy and increased thermal stress; sustained operation at 40V is not advised for reliability.
Can AZ431BZ-ATRG1 replace a standard Zener diode directly?
Yes - AZ431BZ-ATRG1 replaces Zener diodes in 2.5V–36V applications with superior performance: lower dynamic impedance (0.15Ω vs. >10Ω for Zeners), tighter tolerance (0.8% vs. 5–10%), and stable temperature coefficient (20ppm/°C vs. >5000ppm/°C). External resistor divider is required to set output voltage.
Is AZ431BZ-ATRG1 compatible with leaded solder reflow processes?
No - AZ431BZ-ATRG1 uses a fully lead-free, halogen-free "Green" molding compound and is rated for Pb-free reflow only. Peak reflow temperature must not exceed 260°C (per JEDEC J-STD-020), and moisture sensitivity level is MSL1 - no baking required prior to assembly.
How does the TO92 package affect thermal performance?
In TO92 packaging, AZ431BZ-ATRG1 exhibits 165°C/W junction-to-ambient thermal resistance. At 100mA sink current and 36V cathode voltage, power dissipation reaches 3.6W - requiring heatsinking or derating to stay within 150°C max junction temperature. For >1W operation, consider SOT89 or forced-air cooling.
AZ431BZ-ATRG1 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-ATRG1 FAQ
1.How can I place an order for AZ431BZ-ATRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BZ-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 AZ431BZ-ATRG1 reliable?
The price and inventory of AZ431BZ-ATRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BZ-ATRG1 is usually 5 days.
3.What payment methods are accepted for AZ431BZ-ATRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BZ-ATRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BZ-ATRG1?
AZ431BZ-ATRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BZ-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 AZ431BZ-ATRG1?
For technical support, including AZ431BZ-ATRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BZ-ATRG1 requirements.
6.How does Aetrix verify that AZ431BZ-ATRG1 is sourced from the original manufacturer or authorized distributors?
All AZ431BZ-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 AZ431BZ-ATRG1 meets industry standards.
7.What is the process for return or replacement of AZ431BZ-ATRG1?
All AZ431BZ-ATRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BZ-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 AZ431BZ-ATRG1 part is unused and in its original packaging.
Return procedure for AZ431BZ-ATRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431BZ-ATRG1 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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