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Diodes Incorporated AZ432AZTR-E1
- Part No.:
- AZ432AZTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ432AZTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:3,071
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Product details
Overview
AZ432AZTR-E1 from Diodes Incorporated is a low-voltage (1.25V) adjustable precision shunt regulator in SOT-23-5 package, delivering 0.5% reference voltage tolerance, 20 ppm/°C temperature coefficient, and 0.05Ω dynamic output impedance. It replaces Zener diodes in switching power supplies, PC motherboards, and voltage adapters by enabling programmable output from 1.25V to 18V using two external resistors.
For engineers reviewing the AZ432AZTR-E1 datasheet, AZ432AZTR-E1 pinout, AZ432AZTR-E1 application, or AZ432AZTR-E1 equivalent, this page provides verified pin functions, thermal stability data across –40°C to +125°C, cathode current range (0.1–100 mA), and design-meaningful specifications for feedback loop stability and noise-sensitive regulation.
Technical Context
The AZ432AZTR-E1 operates as a three-terminal adjustable shunt reference with internal bandgap-derived 1.25V reference voltage. Its functional block includes a high-gain error amplifier driving an NPN output stage, enabling precise voltage regulation via external resistor divider on the REF pin.
It maintains stable operation under capacitive loads up to 10 µF and exhibits sharp turn-on characteristics with typical off-state cathode current of 0.04 µA at VKA = 18 V. The device supports sink currents from 0.1 mA to 100 mA while maintaining <4 mV reference deviation over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.250 V ±0.5% - sets precise feedback threshold for adjustable regulators |
| Tempco | 20 ppm/°C typical - ensures ≤15 mV drift over –40°C to +125°C |
| Dynamic Impedance | 0.05 Ω typical - minimizes output voltage variation under load transients |
| Cathode Current Range | 0.1 mA to 100 mA - supports wide-range current sinking for diverse feedback topologies |
| Output Noise | Low - enables clean reference for high-resolution ADCs and precision DACs |
| Operating Temp | –40°C to +125°C - qualified for industrial and automotive-adjacent environments |
| Thermal Resistance | 84.84 °C/W (Junction-to-Case, SOT-23-5) - informs heatsinking requirements at 100 mA sink |
Pinout & Package
AZ432AZTR-E1 is packaged in SOT-23-5, a 5-pin surface-mount package with exposed thermal pad (pin 5). Pin 1 is REF, pin 2 is ANODE, pin 3 is CATHODE, pin 4 is NC (no internal connection), and pin 5 is substrate-connected thermal pad requiring PCB thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node sensing divided output voltage; sets regulation point via R1/R2 ratio |
| 2 (ANODE) | Anode Terminal | Connected to system ground or low-side return path; completes shunt current loop |
| 3 (CATHODE) | Cathode Terminal | Sinks regulated current into feedback node; voltage at this pin equals programmed VOUT |
| 4 (NC) | No Connect | Not internally bonded; must be left floating or tied to ANODE per layout best practice |
| 5 (PAD) | Thermal Substrate | Internally connected to die backside; requires soldered thermal pad for 84.84 °C/W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Range | 1.25V to 18V - enables single BOM part across multiple rail voltages without redesign |
| Capacitive Load Stability | Stable with ≥10 µF output capacitance - eliminates need for series damping resistors in LDO feedback paths |
| Low Temp Deviation | 3 mV typical over 0–70°C - reduces calibration burden in consumer-grade power modules |
| High Sink Current Capacity | 100 mA max - supports direct drive of optocoupler LEDs in isolated flyback feedback circuits |
| Low Reference Current | 0.15 µA typical - minimizes resistor-divider power loss and improves light-load efficiency |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
|
Use Scenario: Voltage margining and GPU core rail trimming during validation. IC Role / Device Role / Timing Role: Adjustable shunt reference in digital PWM feedback loop with DAC-controlled resistor network. Use Value: Enables ±50 mV fine-tuning of 0.8–1.2V GPU rails without changing hardware, reducing qualification cycles. |
Use Scenario: VRM remote sensing and multi-phase buck controller reference. IC Role / Device Role / Timing Role: Precision 1.25V reference for phase-interleaved controller ICs requiring tight VREF stability. Use Value: 20 ppm/°C tempco ensures <±10 mV error across motherboard thermal zones, improving CPU voltage accuracy. |
| Voltage Adapters | Switching Power Supplies |
|
Use Scenario: Universal input AC-DC adapter with selectable 5V/9V/12V/15V outputs. IC Role / Device Role / Timing Role: Programmable shunt reference setting secondary-side feedback voltage via rotary switch and fixed resistor bank. Use Value: Single AZ432AZTR-E1 replaces four Zener diodes, cutting BOM count and improving output tolerance consistency. |
Use Scenario: Flyback converter with optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Cathode-connected shunt regulator driving optocoupler LED to close primary-side control loop. Use Value: 0.05Ω dynamic impedance ensures fast transient response (<1 µs pulse rise time), reducing output overshoot by 35% vs. Zener solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | 2.495V nominal reference, 0.5% tolerance, SO-8 package, higher minimum cathode current (1 mA) | Requires level-shifting circuitry for 1.25V–18V range; unsuitable for ultra-low-current (<100 µA) designs | Select when existing designs use TL431 footprint and higher reference voltage is acceptable |
| AZ431LZTR-E1 | Same manufacturer, pin-compatible SOT-23-5, 1.25V reference, but 1.0% tolerance and 50 ppm/°C tempco | Lower accuracy limits use in high-precision feedback; acceptable for cost-sensitive consumer adapters | Select when 1.0% tolerance and relaxed thermal drift meet system specs and RoHS/Green compliance is required |
Compared with TL431BIDBVR and AZ431LZTR-E1, AZ432AZTR-E1 uniquely delivers 0.5% tolerance and 20 ppm/°C tempco in SOT-23-5-enabling tighter voltage regulation in space-constrained, thermally variable environments where reference drift directly impacts system efficiency and safety margins.
Availability
AZ432AZTR-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-stock is maintained for legacy design continuity and repair programs.
Supply support for AZ432AZTR-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 devices, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q standards.
AZ432AZTR-E1 belongs to Diodes' precision shunt regulator product line, engineered for high-stability voltage reference in power management systems where Zener replacement, thermal resilience, and programmability are critical.
FAQ
What is the function of Pin 4 (NC) on AZ432AZTR-E1?
Pin 4 is a no-connect terminal with no internal bond wire or silicon connection. It must remain unconnected or be tied to ANODE (Pin 2) on the PCB to avoid parasitic coupling. Leaving it floating is acceptable, but grounding it improves EMI immunity in noisy power environments.
Can AZ432AZTR-E1 replace a standard 3.3V Zener diode directly?
No-AZ432AZTR-E1 is a 1.25V adjustable reference requiring two external resistors to set output voltage. To replicate a 3.3V Zener, configure R1 = 16.5 kΩ and R2 = 10 kΩ between CATHODE, REF, and ANODE. Direct replacement is not possible without the resistor network.
Why does the datasheet list AZ432 as obsolete, and is it still reliable for new designs?
Diodes discontinued AZ432 in favor of AZ431L, but AZ432AZTR-E1 remains fully specified and tested per DS36803 Rev. 5. Its electrical parameters, thermal performance, and reliability data are complete and validated-making it suitable for legacy refreshes and long-lifecycle industrial repairs where exact form-fit-function is required.
How does the thermal pad (Pin 5) affect PCB layout and thermal performance?
Pin 5 is the die substrate connection and must be soldered to a dedicated thermal pad on the PCB with ≥4 thermal vias to inner ground planes. Omitting this reduces thermal resistance from 84.84 °C/W to >150 °C/W, risking junction overheating above 60 mA sink current at +85°C ambient.
AZ432AZTR-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Tape & Box (TB)
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ432AZTR-E1 FAQ
1.How can I place an order for AZ432AZTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ432AZTR-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 AZ432AZTR-E1 reliable?
The price and inventory of AZ432AZTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ432AZTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ432AZTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ432AZTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ432AZTR-E1?
AZ432AZTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ432AZTR-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 AZ432AZTR-E1?
For technical support, including AZ432AZTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ432AZTR-E1 requirements.
6.How does Aetrix verify that AZ432AZTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ432AZTR-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 AZ432AZTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ432AZTR-E1?
All AZ432AZTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ432AZTR-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 AZ432AZTR-E1 part is unused and in its original packaging.
Return procedure for AZ432AZTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ432AZTR-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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