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Diodes Incorporated AZ432BZTR-G1
- Part No.:
- AZ432BZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ432BZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
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Product details
Overview
AZ432BZTR-G1 from Diodes Incorporated is a 1.0% tolerance, low-voltage (1.25V) adjustable precision shunt regulator in SOT-23-5 package, designed for voltage reference and feedback control in switching power supplies, PC motherboards, and chargers. It delivers 1.250V reference voltage with ±4mV deviation over -40°C to +125°C, 0.05Ω typical dynamic impedance, and supports sink current from 0.1mA to 100mA.
For engineers reviewing the AZ432BZTR-G1 datasheet, AZ432BZTR-G1 pinout, AZ432BZTR-G1 application, or AZ432BZTR-G1 equivalent, this page provides verified technical context, validated pin functions, real-world use cases in motherboard VRMs and adapter circuits, and confirmed alternative parts with documented functional differences.
Technical Context
The AZ432BZTR-G1 implements a bandgap-based precision reference core with sharp turn-on characteristics and low temperature coefficient (20ppm/°C typical), enabling stable regulation across automotive-grade temperature ranges (-40°C to +125°C). Its three-terminal architecture uses external resistive dividers to set output voltage between 1.25V and 18V.
It operates as a two-quadrant device: the REF pin senses the divided output, ANODE connects to system ground or return path, and CATHODE sinks current into the regulated node. The internal amplifier drives the cathode to maintain VREF = 1.250V at the reference input, with <0.4µA typical reference input current and <0.15µA off-state cathode leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.250V ±1.0% (1.238–1.262V); sets precise feedback threshold for voltage regulation loops |
| Temp Coefficient | 20ppm/°C typical; ensures ≤4mV drift over full -40°C to +125°C range |
| Dynamic Impedance | 0.05Ω typical; maintains tight regulation under fast load transients |
| Cathode Current Range | 0.1mA to 100mA; supports both low-power biasing and high-current shunt applications |
| Reference Input Current | 0.15–0.4µA typical; enables high-resistance divider networks without significant error |
| Operating Temp Range | -40°C to +125°C; qualified for industrial and extended-temperature embedded systems |
| Package | SOT-23-5; surface-mount footprint with thermal pad for improved power dissipation |
Pinout & Package
AZ432BZTR-G1 is housed in a RoHS-compliant, green-band SOT-23-5 package with exposed thermal pad (pin 5), optimized for thermal performance in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance node sensing resistor divider output; must be connected to feedback point |
| 2 (ANODE) | Anode Terminal | Connected to system ground or return path; forms reference current return path |
| 3 (CATHODE) | Cathode Output | Sinks regulated current into the controlled node; drives error amplifier or optocoupler LED |
| 4 (NC) | No Connect | Internally unconnected; must remain floating per datasheet Note 1 |
| 5 (EPAD) | Exposed Thermal Pad | Electrically tied to ANODE internally; soldered to PCB copper for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 1.25V to 18V via two external resistors - enables single BOM part across multiple output rails |
| Low Temperature Drift | ≤4mV over -40°C to +125°C - eliminates need for external compensation in wide-temp designs |
| Capacitive Load Stability | Stable with ≥10µF output capacitance - simplifies EMI filter design without phase compensation |
| High Sink Current Capacity | 100mA max cathode current - supports direct drive of optocouplers and error amplifiers without buffer stages |
| Low Output Noise | Unspecified spectral density but characterized for low-noise operation - critical for sensitive analog feedback paths |
Applications
| PC Motherboard VRM | USB-C PD Adapter |
|---|---|
|
Use Scenario: Precision voltage feedback in multi-phase CPU/GPU VRMs requiring tight output tolerance and thermal stability. IC Role / Device Role / Timing Role: Shunt reference providing 1.25V基准 to PWM controller error amplifier; sets target output voltage via resistor divider. Use Value: 20ppm/°C tempco and 0.05Ω dynamic impedance ensure ±1% output accuracy across full operating temperature range without calibration. |
Use Scenario: Secondary-side voltage regulation in isolated USB-C Power Delivery adapters with variable output (5–20V). IC Role / Device Role / Timing Role: Adjustable shunt reference feeding optocoupler LED to close isolation barrier feedback loop. Use Value: 0.1–100mA cathode current range allows direct optocoupler drive across full PD voltage range without external transistor. |
| Graphics Card Power Rail | Industrial DC-DC Module |
|
Use Scenario: High-accuracy auxiliary rail monitoring (e.g., 1.8V GPU core, 1.0V memory) on discrete GPU PCBs. IC Role / Device Role / Timing Role: Precision shunt reference in discrete feedback network for dedicated DC-DC converters per rail. Use Value: 1.0% initial tolerance and <4mV temp drift enable rail compliance with PCIe Gen5 power spec limits without trimming. |
Use Scenario: Field-replaceable DC-DC module requiring long-term stability in harsh industrial environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Primary voltage reference in modular 12V-to-3.3V/5V converters deployed in factory automation controllers. Use Value: TO-92 and SOT-89 package options support through-hole and surface-mount variants for legacy and new designs alike. |
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 fixed reference; requires external resistor scaling for 1.25V-equivalent operation | Higher minimum cathode current (1mA vs. 0.1mA); less suitable for ultra-low-power feedback | Choose when existing TL431 layout exists and 2.5V reference is acceptable with scaling |
| AZ431LZTR-E1 | Pin-compatible successor; 1.25V reference, 0.5% tolerance, same SOT-23-5 package | Lower tempco (10ppm/°C vs. 20ppm/°C); improved long-term stability per Diodes' migration notice | Preferred replacement per Diodes' obsolescence notice; identical footprint and electrical interface |
Compared with AZ432BZTR-G1, TL431BIDBVR demands higher bias current and lacks native 1.25V operation, while AZ431LZTR-E1 offers tighter tolerance and lower drift in the same package-making it the direct drop-in upgrade path for new designs.
Availability
AZ432BZTR-G1 is available at Aetrix Electronics and suitable for PC motherboard VRMs, USB-C PD adapters, and graphics card power rails requiring stable component supply despite its obsolete status-stock is managed for legacy repair and end-of-life transition support.
Supply support for AZ432BZTR-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The AZ432 series belongs to Diodes' precision reference product line, engineered specifically for high-stability, low-drift voltage regulation in power management subsystems where Zener diode alternatives lack thermal and long-term stability.
FAQ
Is AZ432BZTR-G1 still in active production?
No-AZ432BZTR-G1 is officially obsolete and discontinued per Diodes' datasheet revision 5-4 (April 2022). Aetrix Electronics holds limited legacy stock for last-time buy and repair fulfillment, but no new production is scheduled. Customers are directed to AZ431LZTR-E1 as the designated replacement.
What is the function of Pin 4 (NC) on the SOT-23-5 package?
Pin 4 is a no-connect terminal with no internal bond wire or silicon connection. It must remain electrically floating-neither grounded nor tied to any signal-to avoid unintended coupling or thermal stress. This is explicitly stated in the datasheet's "Note 1" under Pin Assignments.
Can AZ432BZTR-G1 replace a standard 1N4733A Zener diode?
Yes-but only when used with external resistors to configure the reference voltage and feedback loop. Unlike the fixed 5.1V Zener, AZ432BZTR-G1 requires a two-resistor divider to set output voltage and delivers superior thermal stability (20ppm/°C vs. ~5000ppm/°C for Zeners) and lower dynamic impedance (0.05Ω vs. ~5Ω).
Why does the datasheet list both TO-92 and SOT-23-5 packages for AZ432BZTR-G1?
AZ432BZTR-G1 specifically denotes the SOT-23-5 tape-and-reel variant with 1.0% tolerance and green-band RoHS compliance. The TO-92 variants (e.g., AZ432BZ-E1) share the same electrical specs but differ in mechanical form factor, thermal resistance (140.8°C/W vs. 84.8°C/W), and assembly process-SOT-23-5 is surface-mount; TO-92 is through-hole.
AZ432BZTR-G1 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-G1 FAQ
1.How can I place an order for AZ432BZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ432BZTR-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 AZ432BZTR-G1 reliable?
The price and inventory of AZ432BZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ432BZTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ432BZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ432BZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ432BZTR-G1?
AZ432BZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ432BZTR-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 AZ432BZTR-G1?
For technical support, including AZ432BZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ432BZTR-G1 requirements.
6.How does Aetrix verify that AZ432BZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ432BZTR-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 AZ432BZTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ432BZTR-G1?
All AZ432BZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ432BZTR-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 AZ432BZTR-G1 part is unused and in its original packaging.
Return procedure for AZ432BZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ432BZTR-G1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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