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Diodes Incorporated AZ432BRTR-G1
- Part No.:
- AZ432BRTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AZ432BRTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,733
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Product details
Overview
AZ432BRTR-G1 from Diodes Incorporated is a low-voltage (1.25V) adjustable precision shunt regulator in SOT-89 package, designed as a Zener diode replacement with 1.0% initial voltage tolerance, 20 ppm/°C typical temperature coefficient, and 0.05Ω typical dynamic output impedance for stable voltage reference in switching power supplies and motherboard VRMs.
For engineers reviewing the AZ432BRTR-G1 datasheet, AZ432BRTR-G1 pinout, AZ432BRTR-G1 application, or AZ432BRTR-G1 equivalent, this device supports programmable output from 1.25V to 18V using two external resistors, operates across –40°C to +125°C, and delivers sink current from 0.1mA to 100mA with low output noise and high capacitive load stability.
Technical Context
The AZ432BRTR-G1 implements a bandgap-based precision reference core with sharp turn-on characteristics and low thermal drift, enabling accurate feedback control in isolated and non-isolated DC-DC converters. Its internal architecture ensures stable regulation even under varying cathode voltage (VKA = VREF to 16V) and wide ambient temperature ranges.
It functions as a 3-terminal adjustable shunt regulator where the REF pin senses the reference voltage (1.250V), ANODE connects to system ground or return path, and CATHODE sinks current to maintain regulated output. The device requires no external compensation and remains stable with up to 10µF output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.250 V ±1.0% - sets precise feedback threshold for adjustable regulators |
| Tempco (ΔVREF/°C) | 20 ppm/°C typical - ensures ≤4 mV drift over –40°C to +125°C |
| Dynamic Impedance (ZKA) | 0.05 Ω typical - maintains tight regulation under fast load transients |
| Cathode Current Range | 0.1 mA to 100 mA - supports both low-power biasing and high-current shunt applications |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded systems |
| Output Noise | Low - enables clean feedback in sensitive analog control loops without added filtering |
| Min Cathode Current (IKA) | 55 µA typical - ensures reliable turn-on at light loads without dropout |
Pinout & Package
SOT-89 package: 3-pin surface-mount plastic package with exposed thermal pad; pin 1 = REF, pin 2 = ANODE, pin 3 = CATHODE; thermal resistance θJC = 29.8°C/W enables >500mW power dissipation with proper PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node sensing 1.25V internal bandgap; connects to resistor divider midpoint |
| Pin 2 (ANODE) | Ground Reference | Must be connected to system ground or low-impedance return path; ties internal substrate |
| Pin 3 (CATHODE) | Current Sink Output | Sinks regulated current to maintain VOUT; connects to feedback node of PWM controller or error amplifier |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Range | 1.25V to 18V via two external resistors - eliminates need for multiple fixed-voltage references |
| Capacitive Load Stability | Stable with ≥10µF ceramic output capacitance - simplifies EMI filter design in SMPS |
| Low Tempco Drift | ≤4 mV total deviation over –40°C to +125°C - enables single-point calibration in industrial systems |
| Sharp Turn-On Threshold | Fast regulation onset at VREF ±10mV - prevents oscillation during startup and line transients |
| Low Quiescent Current | 0.15 µA typical IREF - minimizes divider network power loss in battery-backed circuits |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: GPU voltage rail monitoring and VRM feedback loop in discrete graphics cards. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 1.25V feedback to multiphase buck controllers. Use Value: Enables tight output voltage tolerance (<±1%) across full GPU load range and temperature swing. |
Use Scenario: Core voltage regulation for CPU and chipset power delivery on ATX motherboards. IC Role / Device Role / Timing Role: Adjustable reference for digital PWM controllers managing 12V-to-1.0V conversion. Use Value: Supports dynamic VID scaling while maintaining <2% output error across –40°C to +85°C ambient. |
| Voltage Adapters | Switching Power Supplies |
Use Scenario: Universal input AC-DC adapter with multiple USB-C PD output profiles. IC Role / Device Role / Timing Role: Programmable reference setting different output voltages (5V/9V/15V/20V) via MCU-controlled resistor network. Use Value: Reduces BOM count by replacing four fixed references with one adjustable IC and DAC-controlled resistors. |
Use Scenario: Secondary-side feedback in isolated flyback converters for industrial IoT power modules. IC Role / Device Role / Timing Role: Shunt regulator referenced to optocoupler LED anode, closing isolation barrier feedback loop. Use Value: Achieves <±2% cross-regulation across multiple outputs without TL431-level complexity or cost. |
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 | 2.495V fixed reference; higher minimum cathode current (1mA); 50ppm/°C tempco | Requires level-shifting circuitry to achieve <2V outputs; less suitable for low-voltage VRMs | Select when legacy design compatibility or higher sink current (>100mA) is required |
| AZ431LARTR-G1 | Same 1.25V reference but improved 0.5% tolerance and lower 15ppm/°C tempco; SOT-89 pin-compatible | Direct drop-in upgrade path with tighter regulation and better thermal stability | Preferred for new designs requiring enhanced accuracy without layout change |
Compared with TL431BIDBZR, AZ432BRTR-G1 enables true sub-2V programmable regulation without external dividers, while AZ431LARTR-G1 offers measurable improvement in long-term stability and production yield for high-accuracy power rails.
Availability
AZ432BRTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and voltage adapters requiring stable component supply despite its obsolete status-stock is maintained for legacy system support and repair programs.
Supply support for AZ432BRTR-G1 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.
The AZ432 series belongs to Diodes' precision reference product line, engineered specifically to replace Zener diodes in high-stability feedback paths of DC-DC converters and voltage regulators where thermal drift and dynamic impedance critically impact performance.
FAQ
What is the maximum cathode voltage rating for AZ432BRTR-G1?
The absolute maximum cathode voltage (VKA) is 20V, but recommended operating range limits VKA to 18V. Exceeding 18V risks exceeding power dissipation limits and degrading long-term reliability, especially at elevated temperatures. Operation above 18V requires derating based on thermal resistance and ambient conditions.
Can AZ432BRTR-G1 replace a standard Zener diode directly?
Yes, it replaces Zener diodes in 3-terminal configurations where REF connects to the Zener cathode node, ANODE to ground, and CATHODE to the supply rail. Unlike Zeners, it requires no minimum current to regulate and provides superior temperature stability and lower dynamic impedance than typical 1N47xx devices.
Is AZ432BRTR-G1 RoHS compliant and halogen-free?
Yes, the "G1" suffix indicates RoHS-compliant and green (halogen-free) construction per Diodes Incorporated's product definitions. This includes lead-free terminations, compliant molding compounds, and adherence to JEDEC J-STD-609A Class 1 halogen content requirements.
Why is AZ432 marked as obsolete, and what is the recommended replacement?
Diodes discontinued AZ432 in favor of AZ431L, which offers identical pinout, improved 0.5% tolerance option, lower 15ppm/°C tempco, and enhanced ESD robustness. AZ431LARTR-G1 is the direct SOT-89 replacement; migration requires only part number update and validation of reference voltage tolerance impact on system accuracy.
AZ432BRTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AZ432BRTR-G1 FAQ
1.How can I place an order for AZ432BRTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ432BRTR-G1 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 AZ432BRTR-G1 reliable?
The price and inventory of AZ432BRTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ432BRTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ432BRTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ432BRTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ432BRTR-G1?
AZ432BRTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ432BRTR-G1 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 AZ432BRTR-G1?
For technical support, including AZ432BRTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ432BRTR-G1 requirements.
6.How does Aetrix verify that AZ432BRTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ432BRTR-G1 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 AZ432BRTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ432BRTR-G1?
All AZ432BRTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ432BRTR-G1, 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 AZ432BRTR-G1 part is unused and in its original packaging.
Return procedure for AZ432BRTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ432BRTR-G1 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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