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Diodes Incorporated AZ432BZTR-E1
- Part No.:
- AZ432BZTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ432BZTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,679
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Product details
Overview
AZ432BZTR-E1 from Diodes Incorporated is a 1.0% tolerance, low-voltage (1.25V) adjustable precision shunt regulator in SOT-23 package, delivering 0.05Ω typical dynamic impedance, ±4mV reference voltage deviation over -40°C to +125°C, and 0.1–100mA sink current capability - used as a programmable voltage reference in PC motherboard VRMs and switching power supply feedback loops.
For engineers reviewing the AZ432BZTR-E1 datasheet, AZ432BZTR-E1 pinout, AZ432BZTR-E1 application, or AZ432BZTR-E1 equivalent, this page provides verified pin assignments, thermal resistance (84.84°C/W), cathode voltage range (1.25–18V), and real-world use cases in precision 2.5V/1A regulators and PWM converter references.
Technical Context
The AZ432BZTR-E1 implements a bandgap-based 1.25V reference core with sharp turn-on characteristics and low temperature coefficient (20ppm/°C typical), enabling stable output voltage programming via two external resistors across REF–ANODE–CATHODE terminals. Its internal architecture supports high stability under capacitive loads up to 10µF without oscillation.
It operates as a three-terminal shunt regulator where cathode voltage is set by VREF × (1 + R1/R2); reference input current remains ultra-low (0.15–0.4µA typical), minimizing resistor network loading error and supporting high-impedance feedback designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.250V ±1.0% - sets precise base voltage for programmable output between 1.25V and 18V |
| ∆VREF (–40°C to +125°C) | ±4mV max - ensures <0.32% reference drift across full industrial temperature range |
| ZKA (Dynamic Impedance) | 0.05Ω typical - maintains tight regulation under fast load transients in SMPS feedback paths |
| IKA Range | 0.1mA to 100mA - supports both low-power biasing and high-current shunt applications |
| θJC | 84.84°C/W - enables thermal design margin of ~8.5°C rise at 100mA in SOT-23 package |
| Temp Coefficient | 20ppm/°C typical - contributes <±0.25% total error over 100°C span |
| Output Noise | Low - critical for noise-sensitive ADC references and precision DAC buffers |
Pinout & Package
SOT-23 package: 3-pin surface-mount plastic case with gull-wing leads, 2.3–2.5mm length, 1.2–1.4mm width, 0.9–1.03mm height; thermal pad not present; JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Current sink node | Connected to regulated output node; carries full load current plus reference current |
| Pin 2 (ANODE) | Reference return path | Internally tied to substrate; must be connected to system ground or left open per layout guidelines |
| Pin 3 (REF) | Precision reference input | High-impedance node (0.15–0.4µA) used to set output voltage via external resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 1.25V to 18V using only two external resistors - eliminates need for multiple Zener diodes |
| Capacitive load stability | Stable with ≥10µF output capacitance - avoids compensation networks in adapter and charger designs |
| Low temperature deviation | 3mV typical drift - reduces calibration overhead in automotive-grade power modules |
| High sink current capacity | 100mA maximum - supports direct driving of optocoupler LEDs in isolated flyback controllers |
| Wide operating ambient range | –40°C to +125°C - qualified for under-hood and industrial control environments |
Applications
| PC Motherboard VRM | USB-C Charger Feedback |
|---|---|
Use Scenario: Voltage regulation for CPU/GPU core supplies on ATX motherboards. IC Role / Device Role / Timing Role: Adjustable shunt reference in multi-phase buck converter feedback loop. Use Value: Enables accurate 0.8–1.5V output setting with <±1% total error across temperature and line variations. |
Use Scenario: Secondary-side voltage sensing in 20–65W USB PD chargers. IC Role / Device Role / Timing Role: Precision reference for optocoupler-coupled feedback in isolated flyback topology. Use Value: Maintains ±5% output accuracy despite 100mV line drop and 10µF bulk capacitor ESR variation. |
| Graphic Card Power Rail | Industrial Switching PSU |
Use Scenario: GPU memory I/O voltage (1.35V) and auxiliary rail regulation. IC Role / Device Role / Timing Role: Shunt reference in discrete MOSFET-based synchronous buck controller. Use Value: Delivers <100ns response to load steps while sustaining 1.25V reference integrity under 50kHz ripple. |
Use Scenario: Field-programmable output voltage in DIN-rail mounted 24V/5A DC-DC converters. IC Role / Device Role / Timing Role: Programmable reference for TL494 or UC384x-based PWM ICs. Use Value: Allows single-BOM support for 12V, 15V, and 24V outputs via resistor change only. |
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 fixed reference; requires external resistor scaling to match 1.25V base point | Higher minimum cathode current (1mA vs. 55µA); less suitable for ultra-low-power adapters | Choose when legacy TL431 footprint compatibility is required and 2.5V base reference suffices |
| AZ431LZTR-E1 | Successor part; same pinout, improved 0.5% initial tolerance, lower 15ppm/°C tempco | Direct replacement with enhanced accuracy; Diodes recommends migration for new designs | Preferred for new designs requiring tighter regulation; backward-compatible in SOT-23 layout |
Compared with TL431BIDBZR, AZ432BZTR-E1 offers lower reference voltage (1.25V vs. 2.495V) and 20× lower minimum cathode current, enabling higher resistor values and reduced quiescent power; versus AZ431LZTR-E1, it trades 0.5% tolerance and 15ppm/°C for cost-sensitive legacy production runs.
Availability
AZ432BZTR-E1 is available at Aetrix Electronics and suitable for PC motherboard VRMs, USB-C charger feedback circuits, and industrial switching power supplies requiring stable component supply amid obsolescence transitions.
Supply support for AZ432BZTR-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in IATF 16949-certified facilities.
The AZ432 series belongs to Diodes' precision reference product line, engineered specifically for cost-sensitive, high-volume power management applications requiring programmable shunt regulation with automotive-grade temperature resilience.
FAQ
What is the maximum cathode voltage rating for AZ432BZTR-E1?
The absolute maximum cathode voltage (VKA) is 20V. Operation above 18V violates recommended conditions and risks accelerated parametric shift or thermal runaway. For 24V bus applications, external clamping or series resistor limiting is mandatory to keep VKA ≤18V during transients.
Can AZ432BZTR-E1 replace a standard 3.3V Zener diode?
No - AZ432BZTR-E1 is not a drop-in Zener replacement. It requires a two-resistor divider to set output voltage and draws reference current (0.15–0.4µA). Direct substitution would cause open-circuit failure; proper implementation uses REF connected to divider midpoint and ANODE grounded.
Is AZ432BZTR-E1 still in active production?
No - Diodes has marked AZ432BZTR-E1 as obsolete and recommends AZ431LZTR-E1 as its functional successor. Aetrix Electronics holds final-buy inventory and supports last-time procurement with full traceability, but no new wafer starts are planned.
How does pin 2 (ANODE) connection affect performance?
Pin 2 is internally bonded to the substrate and must be connected to system ground or left floating - never tied to cathode or positive rail. Incorrect connection causes reference instability or catastrophic latch-up. In SOT-23 layouts, grounding Pin 2 improves thermal dissipation and reduces noise coupling into REF.
AZ432BZTR-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:
- ±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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ432BZTR-E1 FAQ
1.How can I place an order for AZ432BZTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ432BZTR-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 AZ432BZTR-E1 reliable?
The price and inventory of AZ432BZTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ432BZTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ432BZTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ432BZTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ432BZTR-E1?
AZ432BZTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ432BZTR-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 AZ432BZTR-E1?
For technical support, including AZ432BZTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ432BZTR-E1 requirements.
6.How does Aetrix verify that AZ432BZTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ432BZTR-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 AZ432BZTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ432BZTR-E1?
All AZ432BZTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ432BZTR-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 AZ432BZTR-E1 part is unused and in its original packaging.
Return procedure for AZ432BZTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ432BZTR-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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