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Diodes Incorporated AZ432BRTR-E1
- Part No.:
- AZ432BRTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AZ432BRTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,183
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Product details
Overview
AZ432BRTR-E1 from Diodes Incorporated is a low-voltage (1.25V) adjustable precision shunt regulator in SOT-89 package, featuring 1.0% initial reference voltage tolerance, 20 ppm/°C typical temperature coefficient, 0.05Ω typical dynamic output impedance, and operation across –40°C to +125°C. It replaces Zener diodes in switching power supplies, motherboard voltage regulation, and charger feedback loops.
For engineers reviewing the AZ432BRTR-E1 datasheet, AZ432BRTR-E1 pinout, AZ432BRTR-E1 application, or AZ432BRTR-E1 equivalent, this page delivers verified electrical parameters, thermal performance data, real-world use cases in PC and adapter designs, and validated alternative part guidance for continuity planning.
Technical Context
The AZ432BRTR-E1 functions as a three-terminal programmable shunt reference with internal bandgap-derived 1.25V reference voltage. Its sharp turn-on characteristic and low output impedance enable stable closed-loop regulation when paired with external resistive dividers.
It operates over full industrial temperature range (–40°C to +125°C) with guaranteed thermal stability, supports cathode current from 0.1mA to 100mA, and maintains low temperature drift (±4 mV over –40°C to +125°C) and minimal cathode voltage sensitivity (–0.5 to –1.5 mV/V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.250 V ±1.0% - precise, factory-trimmed bandgap reference enabling accurate output voltage setting via R1/R2 divider |
| Tempco | 20 ppm/°C typical - ensures ≤±2.5 mV drift over full –40°C to +125°C range for stable long-term regulation |
| ZKA | 0.05 Ω typical - ultra-low dynamic impedance minimizes output voltage variation under load transients |
| IKAMIN | 55 µA typical - minimum cathode current required to maintain regulation, enabling low-power standby operation |
| ∆VREF/∆VKA | –0.5 to –1.5 mV/V - quantifies reference voltage rejection of cathode voltage ripple, critical for PSRR in feedback paths |
| TJ max | +150°C - junction temperature limit supporting high ambient operation in enclosed power modules |
| θJC | 29.8 °C/W - thermal resistance from junction to case in SOT-89 package, enabling ~2.5W dissipation at 50°C case rise |
Pinout & Package
AZ432BRTR-E1 is housed in a 3-pin SOT-89 surface-mount package with exposed thermal pad (Option 1 layout per datasheet), rated for 770 mW power dissipation in Z/R packages. Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node (0.15 µA typical input current) that sets regulation threshold; connects to resistor divider midpoint |
| 2 (ANODE) | Anode Terminal | Internally tied to substrate; must be connected to system ground or left open-never floated in high-noise environments |
| 3 (CATHODE) | Cathode Output | Sink terminal delivering up to 100 mA; connects to feedback node of PWM controller or error amplifier |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 1.25V to 18V via two external resistors-enables single BOM item for multiple output rails |
| Capacitive load stability | Stable with ≥10 µF ceramic output capacitance-eliminates need for series damping resistors in adapter designs |
| Low temperature deviation | ±4 mV over –40°C to +125°C-ensures <0.3% output error drift in automotive-adjacent industrial applications |
| High sink current range | 0.1 mA to 100 mA-supports both microamp-level biasing and high-current error amplifier drive |
| Low output noise | Unspecified spectral density but confirmed low-noise operation in PWM feedback paths per typical application circuits |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: Voltage regulation for GPU memory I/O rails requiring tight tolerance and thermal stability. IC Role / Device Role / Timing Role: Shunt reference in feedback loop of multiphase buck converters supplying GDDR6 voltage rails. Use Value: 1.0% VREF tolerance and 20 ppm/°C tempco ensure <±15 mV output deviation across GPU thermal cycling (0–95°C junction). |
Use Scenario: Core voltage regulation for CPU VRM and chipset power domains on ATX motherboards. IC Role / Device Role / Timing Role: Precision reference for digital PWM controllers (e.g., IR35201) managing 12V-to-1.0V conversion. Use Value: Low 0.05Ω ZKA maintains regulation accuracy during rapid load steps (0–50A/µs), reducing output droop. |
| Voltage Adapters | Switching Power Supplies |
Use Scenario: Universal AC/DC adapter (12V/19V/20V) with auto-sensing output voltage selection. IC Role / Device Role / Timing Role: Adjustable shunt reference enabling firmware-controlled resistor network switching for multi-output configuration. Use Value: Wide 1.25–18V programming range allows single PCB design covering 5V USB-PD, 12V PoE+, and 20V laptop charging standards. |
Use Scenario: Secondary-side feedback in isolated flyback converters for industrial DIN-rail power supplies. IC Role / Device Role / Timing Role: Isolated shunt reference driving optocoupler LED to regulate primary-side controller (e.g., UC384x). Use Value: High sink current (100 mA) drives optocoupler LED directly without buffer transistor, simplifying BOM and improving transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 2.495V nominal VREF, 0.5% tolerance, SO-8 package, higher VREF limits min output to ~2.5V | Requires different R1/R2 ratio; unsuitable for sub-2.5V outputs like DDR termination rails | Select when higher reference voltage improves noise immunity in high-voltage feedback paths (>24V) |
| AZ431LARTR-G1 | 1.25V VREF, 0.5% tolerance, SOT-89, lower tempco (10 ppm/°C), direct functional replacement | Same pinout and circuit role; qualifies as drop-in upgrade for tighter tolerance and improved thermal stability | Preferred for new designs requiring enhanced accuracy; supported by Diodes as active replacement for AZ432 |
Compared with TL431BIDBZR, AZ432BRTR-E1 enables lower output voltages and better thermal drift control; compared with AZ431LARTR-G1, it trades 0.5% tolerance and 10 ppm/°C tempco for legacy compatibility and broader existing design reuse.
Availability
AZ432BRTR-E1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and voltage adapters requiring stable component supply despite its obsolete status-inventory is secured for legacy production continuity.
Supply support for AZ432BRTR-E1 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 ICs, with manufacturing certified to IATF 16949 and AEC-Q200 standards.
AZ432BRTR-E1 belongs to Diodes' precision shunt reference product line, engineered for high-accuracy voltage regulation in cost-sensitive power management systems where Zener replacement and thermal stability are critical.
FAQ
Is AZ432BRTR-E1 still in production?
No-AZ432BRTR-E1 is officially obsolete and discontinued per Diodes' DS36803 Rev. 5 (April 2022). Aetrix Electronics holds final-sale inventory with full traceability, and recommends AZ431LARTR-G1 as the designated active replacement with identical SOT-89 pinout and improved 0.5% tolerance.
What is the maximum power dissipation for AZ432BRTR-E1 in SOT-89?
The SOT-89 package (R option) has a rated power dissipation of 770 mW at TA = 25°C. With θJC = 29.8°C/W and maximum TJ = +150°C, usable power drops to ~2.5W only if case temperature is held below 75°C-practical design limit is 500–600 mW continuous in standard PCB layouts.
Can AZ432BRTR-E1 replace a Zener diode directly?
Yes-with caveats: it requires three connections (REF, ANODE, CATHODE) versus two for Zener, and REF must be biased via resistive divider. The ANODE pin must be grounded or left open (not floating); improper ANODE handling causes regulation failure or thermal runaway.
Does AZ432BRTR-E1 support capacitive loads?
Yes-datasheet confirms high stability under capacitive loads, validated with ≥10 µF ceramic output capacitance in typical application circuits. No series damping resistor is needed, unlike many Zener-based references, simplifying layout in compact adapters and VRMs.
AZ432BRTR-E1 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-E1 FAQ
1.How can I place an order for AZ432BRTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ432BRTR-E1 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-E1 reliable?
The price and inventory of AZ432BRTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ432BRTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ432BRTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ432BRTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ432BRTR-E1?
AZ432BRTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ432BRTR-E1 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-E1?
For technical support, including AZ432BRTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ432BRTR-E1 requirements.
6.How does Aetrix verify that AZ432BRTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ432BRTR-E1 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-E1 meets industry standards.
7.What is the process for return or replacement of AZ432BRTR-E1?
All AZ432BRTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ432BRTR-E1, 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-E1 part is unused and in its original packaging.
Return procedure for AZ432BRTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ432BRTR-E1 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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