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Diodes Incorporated AZ432ARTR-E1
- Part No.:
- AZ432ARTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
AZ432ARTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,848
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Product details
Overview
AZ432ARTR-E1 from Diodes Incorporated is a low-voltage (1.25V) adjustable precision shunt regulator in SOT-89 package, delivering 0.5% initial reference voltage tolerance, 20 ppm/°C typical temperature coefficient, and 0.05Ω typical dynamic output impedance. It operates from -40°C to +125°C with cathode current capability up to 100mA, enabling programmable output voltages from 1.25V to 18V in switching power supplies and motherboard voltage regulation circuits.
For engineers reviewing the AZ432ARTR-E1 datasheet, AZ432ARTR-E1 pinout, AZ432ARTR-E1 application, or AZ432ARTR-E1 equivalent, this part serves as a Zener diode replacement requiring precise voltage setting via two external resistors, stable performance under capacitive loads, and automotive-grade thermal reliability - critical for PC power delivery and adapter design.
Technical Context
The AZ432ARTR-E1 implements a bandgap-based reference core with sharp turn-on characteristics and low output impedance, supporting high-sink-current operation (0.1–100 mA) while maintaining <4 mV reference deviation over -40°C to +125°C. Its internal architecture enables stable regulation even with >10 µF capacitive loads at the cathode node.
It functions as a three-terminal adjustable shunt regulator where the REF pin senses the divided output voltage, ANODE connects to system ground or return path, and CATHODE sinks current to maintain VREF × (1 + R1/R2) at the output. The device exhibits <0.15 µA reference input current and <0.1 µA off-state cathode leakage at 18V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.250 V ±0.5% - sets base reference for programmable output voltage calculation |
| Temp Coefficient | 20 ppm/°C typical - ensures ≤15 mV total drift across -40°C to +125°C |
| ZKA | 0.05 Ω typical - minimizes output voltage variation under load transients |
| IKAMIN | 55 µA minimum - defines lowest cathode current needed to sustain regulation |
| VKA Max | 20 V absolute max - limits maximum cathode-to-anode voltage stress |
| IKA Range | 0.1–100 mA continuous - supports wide-range current sinking for feedback loop stability |
| Operating Temp | -40°C to +125°C - qualified for industrial and extended-temperature motherboard applications |
Pinout & Package
AZ432ARTR-E1 is housed in a 3-pin SOT-89 surface-mount package with exposed thermal pad (Option 1 layout per DS36803 Rev. 5-4), optimized for power dissipation (θJC = 29.8 °C/W). Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | Senses voltage divider output; must be connected to feedback node between R1 and R2 |
| Pin 2 (ANODE) | Ground Reference Terminal | Connected to system ground or return path; internally tied to substrate in SOT-89 |
| Pin 3 (CATHODE) | Current Sink Output | Sinks regulated current to maintain set output voltage; connects to supply rail or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 1.25V–18V via two external resistors - eliminates need for multiple fixed-voltage references |
| Capacitive Load Stability | Stable with ≥10 µF output capacitance - simplifies EMI filtering without phase compensation |
| Low Temperature Drift | ≤4 mV over full -40°C to +125°C range - enables reliable operation in unheated enclosures |
| High Sink Current Capacity | 100 mA max cathode current - supports high-gain optocoupler interfaces in isolated SMPS feedback paths |
| Low Dynamic Impedance | 0.05 Ω typical - maintains tight output regulation during fast load steps in CPU VRMs |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
Use Scenario: Precision 1.2V GPU core voltage regulation with dynamic load response. IC Role / Device Role / Timing Role: Shunt reference in secondary-side feedback loop of multiphase buck converter. Use Value: 0.05Ω dynamic impedance ensures <10 mV output deviation during 50 A/µs GPU load transients. |
Use Scenario: Adjustable 3.3V/5V standby rail regulation on ATX power delivery subsystems. IC Role / Device Role / Timing Role: Voltage-setting element for TL431-replacement feedback network. Use Value: 20 ppm/°C tempco guarantees <±15 mV output shift across chassis temperature gradients. |
| Voltage Adapters | Switching Power Supplies |
Use Scenario: Universal-input 12V/24V AC-DC adapter with selectable output voltage. IC Role / Device Role / Timing Role: Programmable reference for opto-coupled primary-side regulation. Use Value: 0.5% VREF tolerance enables ±1% output accuracy without post-production trimming. |
Use Scenario: Flyback converter feedback in industrial DIN-rail power supplies. IC Role / Device Role / Timing Role: Cathode-connected shunt regulator driving optocoupler LED. Use Value: 100 mA sink capacity supports high-CTR optocouplers for robust isolation barrier signaling. |
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 | 2.495V fixed reference; requires external resistor scaling for 1.25V+ outputs; 0.5% tolerance; higher 0.2Ω ZKA | Less flexible voltage programming below 2.495V; higher output impedance reduces transient response | Select when legacy TL431 footprint compatibility is required and 2.5V reference suffices |
| AZ431LARTR-G1 | Successor part; same 1.25V–18V range; improved 0.2% tolerance option; identical SOT-89 pinout and thermal specs | Direct drop-in replacement with tighter initial accuracy and updated qualification status | Prefer for new designs requiring active production support and enhanced reference precision |
Compared with TL431ACDR, AZ432ARTR-E1 offers lower dynamic impedance and native 1.25V start voltage; compared with AZ431LARTR-G1, it shares functional equivalence but lacks current production status - making the AZ431L the recommended long-term sourcing choice.
Availability
AZ432ARTR-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 limited and intended for legacy system repair and continuity programs.
Supply support for AZ432ARTR-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions.
AZ432ARTR-E1 belongs to Diodes' precision reference product line, engineered for high-accuracy voltage regulation in cost-sensitive computing and power conversion systems where Zener diode limitations must be overcome.
FAQ
What is the maximum cathode voltage rating for AZ432ARTR-E1?
The absolute maximum cathode-to-anode voltage (VKA) is 20 V. Exceeding this rating risks permanent damage. In normal operation, the device regulates with VKA ranging from VREF (1.25V) up to 18 V per recommended conditions - sufficient for most 12V and 24V system rails.
Can AZ432ARTR-E1 replace a standard Zener diode directly?
Yes - it replaces Zener diodes in shunt regulator configurations but requires two external resistors to set output voltage and a grounded anode connection. Unlike Zeners, it delivers 0.5% initial tolerance, 20 ppm/°C tempco, and stable performance with capacitive loads - eliminating Zener's poor regulation and thermal drift.
Is AZ432ARTR-E1 qualified for automotive applications?
No - while it operates from -40°C to +125°C, the AZ432 series is not AEC-Q100 qualified. Diodes specifies that automotive-grade variants require explicit change control, PPAP capability, and IATF 16949 manufacturing - none of which apply to AZ432ARTR-E1 per DS36803.
Why does the datasheet state "OBSOLETE – PART DISCONTINUED"?
Diodes has discontinued AZ432ARTR-E1 and recommends AZ431L as its functional successor. The part remains available through authorized distributors for legacy support, but no new wafer fabrication or long-term supply commitments exist - design-in for new projects should use AZ431LARTR-G1 instead.
AZ432ARTR-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:
- ±0.5%
- 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
AZ432ARTR-E1 FAQ
1.How can I place an order for AZ432ARTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ432ARTR-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 AZ432ARTR-E1 reliable?
The price and inventory of AZ432ARTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ432ARTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ432ARTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ432ARTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ432ARTR-E1?
AZ432ARTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ432ARTR-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 AZ432ARTR-E1?
For technical support, including AZ432ARTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ432ARTR-E1 requirements.
6.How does Aetrix verify that AZ432ARTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ432ARTR-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 AZ432ARTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ432ARTR-E1?
All AZ432ARTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ432ARTR-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 AZ432ARTR-E1 part is unused and in its original packaging.
Return procedure for AZ432ARTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ432ARTR-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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