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Diodes Incorporated AZ432BNTR-E1
- Part No.:
- AZ432BNTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ432BNTR-E1.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,700
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Product details
Overview
AZ432BNTR-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 for use in PC motherboard voltage regulation and switching power supply feedback loops.
For engineers reviewing the AZ432BNTR-E1 datasheet, AZ432BNTR-E1 pinout, AZ432BNTR-E1 application, or AZ432BNTR-E1 equivalent, this page delivers verified electrical parameters, validated SOT-23 terminal mapping, confirmed thermal stability data, and real-world implementation guidance for precision voltage reference design.
Technical Context
The AZ432BNTR-E1 operates as a three-terminal adjustable shunt reference with internal bandgap-derived 1.25V reference voltage, enabling programmable output from 1.25V to 18V via two external resistors. Its sharp turn-on characteristic and low temperature coefficient (20ppm/°C typical) support stable closed-loop regulation under varying load and thermal conditions.
It functions as a voltage-controlled current sink where cathode current (IKA) is regulated by the reference input (REF) voltage relative to anode potential. The device maintains low dynamic output resistance (0.05Ω typical) across 1–100mA cathode current and exhibits <0.1µA reference input current, minimizing resistor-divider loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.250V ±1.0% (1.238–1.262V); sets base accuracy for programmable output voltage calculation VOUT = VREF × (1 + R1/R2). |
| Temperature Coefficient | 20ppm/°C typical; ensures ≤±4mV VREF drift over full -40°C to +125°C operating range, critical for automotive and industrial ambient stability. |
| Dynamic Impedance (ZKA) | 0.05Ω typical at 1–100mA; enables tight regulation under fast transient loads without external compensation. |
| Cathode Current Range | 0.1mA to 100mA; supports wide-range sink capability for both low-power biasing and high-current error amplifier feedback paths. |
| Reference Input Current | 0.15–0.4µA typical; permits use of high-value resistor dividers (e.g., 100kΩ+), reducing power loss and thermal drift in precision circuits. |
| Operating Temperature | -40°C to +125°C; qualified for extended industrial and under-hood automotive environments without derating. |
| Thermal Resistance (θJC) | 84.84°C/W (SOT-23); defines junction-to-case heat transfer efficiency-critical for thermal design when dissipating >150mW. |
Pinout & Package
AZ432BNTR-E1 is housed in a standard SOT-23 (TO-236AB) plastic surface-mount package measuring 2.90mm × 1.30mm × 1.00mm, with gull-wing leads and JEDEC-compliant pad layout (E = 0.95mm pitch, Y = 0.90mm lead length).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Current Sink Output | Primary current path; connects to regulated output node or error amplifier inverter input-must be held ≥VREF above ANODE to maintain regulation. |
| Pin 2 (ANODE) | Reference Ground Reference | Return path for reference current and cathode sink current; ties to system ground or power rail return-pin 2 is internally connected to substrate and must not float. |
| Pin 3 (REF) | Reference Input Terminal | Senses voltage divider midpoint; regulates cathode current to force REF = 1.25V, thereby setting VOUT = 1.25V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Range | 1.25V to 18V via two external resistors-enables single BOM part to serve multiple voltage rails in motherboards and adapters. |
| Low Temperature Deviation | ≤±4mV over -40°C to +125°C-reduces need for calibration or software compensation in temperature-sensitive applications like GPU VRMs. |
| High Capacitive Load Stability | Stable with ≥10µF output capacitance-eliminates need for series damping resistors in noisy switcher feedback paths. |
| Low Output Noise | Sub-10µV RMS (typical)-preserves signal integrity in precision ADC references and analog sensor front-ends. |
| Wide Sink Current Range | 0.1mA minimum regulation current-supports ultra-low-power standby modes while maintaining regulation accuracy. |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
|
Use Scenario: Voltage regulation for GPU memory I/O rails and auxiliary power domains requiring tight tolerance and thermal stability. IC Role / Device Role / Timing Role: Adjustable shunt reference in feedback loop of multiphase buck converters supplying GDDR6/GDDR6X memory. Use Value: 20ppm/°C tempco and 0.05Ω ZKA ensure <±1% output variation across die temperature swings up to 100°C during gaming workloads. |
Use Scenario: Precision voltage monitoring and regulation for CPU core, SOC, and DDR termination supplies on ATX and Mini-ITX platforms. IC Role / Device Role / Timing Role: Reference element in secondary-side error amplifiers for isolated DC-DC controllers powering VRM gate drivers and sense circuitry. Use Value: 0.1–100mA sink range accommodates both low-quiescent monitoring and high-bandwidth transient response in multi-rail power sequencing. |
| Voltage Adapters | Switching Power Supplies |
|
Use Scenario: Compact AC/DC adapter designs converting universal input to fixed 5V/12V/19V outputs for laptops and peripherals. IC Role / Device Role / Timing Role: Secondary-side voltage reference in flyback or forward converter feedback network, interfacing with optocoupler or digital isolator. Use Value: SOT-23 footprint and RoHS-compliant E1 marking enable space-constrained, compliant designs meeting Level VI efficiency standards. |
Use Scenario: High-efficiency open-frame PSUs for industrial automation, telecom rectifiers, and LED drivers. IC Role / Device Role / Timing Role: Programmable shunt regulator replacing discrete Zener diodes in TL431-based feedback circuits to improve accuracy and thermal performance. Use Value: 1.0% tolerance and -40°C to +125°C rating allow direct drop-in replacement without recalibration in legacy designs upgrading to tighter spec requirements. |
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% initial tolerance, higher VREF drift (50ppm/°C), 0.2Ω ZKA | Requires different resistor divider ratio; less suitable for sub-2.5V outputs or high-temp industrial use | Select when existing design uses 2.5V reference architecture and cost sensitivity outweighs thermal stability needs |
| AZ431LBNTR-E1 | Same 1.25V VREF, 0.5% tolerance, improved 10ppm/°C tempco, lower 0.02Ω ZKA, pin-compatible SOT-23 | Direct functional upgrade-no layout change required; superior accuracy and noise performance | Preferred replacement for new designs or obsolescence-mitigation where highest precision and lowest impedance are required |
Compared with TL431BIDBVR, AZ432BNTR-E1 offers lower reference voltage, tighter thermal drift, and lower impedance-ideal for low-voltage, high-stability systems. Compared with AZ431LBNTR-E1, it trades 0.5% tolerance and 10ppm/°C for lower cost and broader legacy compatibility, making it optimal for cost-sensitive industrial power supplies where ±1% output tolerance is acceptable.
Availability
AZ432BNTR-E1 is available at Aetrix Electronics and suitable for PC motherboard voltage regulation, switching power supply feedback networks, and voltage adapter designs requiring stable component supply with full industrial temperature support and RoHS compliance.
Supply support for AZ432BNTR-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-reliability power management, signal integrity, and precision analog solutions for industrial, computing, and consumer markets.
AZ432BNTR-E1 belongs to Diodes' precision shunt reference product line, engineered specifically for high-accuracy, thermally stable voltage regulation in space-constrained power conversion systems where Zener diode alternatives fall short.
FAQ
What is the minimum cathode current required for regulation in AZ432BNTR-E1?
The AZ432BNTR-E1 requires a minimum cathode current (IKA(Min)) of 55µA to maintain regulation at 25°C, rising to 80µA across the full -40°C to +125°C range. This value ensures stable reference voltage establishment even under light-load conditions typical in standby or monitoring circuits.
Can AZ432BNTR-E1 replace a standard Zener diode directly?
Yes-AZ432BNTR-E1 replaces Zener diodes in three-terminal configurations where cathode, anode, and reference terminals map to Zener anode, cathode, and control node. Its sharp turn-on, low dynamic impedance, and programmable output eliminate Zener's poor tempco and voltage tolerance limitations without requiring circuit redesign.
Is AZ432BNTR-E1 qualified for automotive applications?
AZ432BNTR-E1 is rated for -40°C to +125°C operation and manufactured in IATF 16949-certified facilities, but it is not AEC-Q100 qualified. For automotive use, Diodes recommends contacting their local representative to discuss PPAP-capable variants or qualified alternatives such as the AZ431L series with formal AEC-Q100 Grade 1 certification.
How does the REF pin function in the AZ432BNTR-E1 feedback loop?
The REF pin senses the voltage divider output between R1 and R2. The internal amplifier forces REF to 1.25V by adjusting cathode current, thereby regulating VOUT = 1.25V × (1 + R1/R2). Its ultra-low input current (0.15–0.4µA) minimizes loading error, allowing high-resistance dividers that reduce power loss and thermal drift.
AZ432BNTR-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
AZ432BNTR-E1 FAQ
1.How can I place an order for AZ432BNTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ432BNTR-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 AZ432BNTR-E1 reliable?
The price and inventory of AZ432BNTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ432BNTR-E1 is usually 5 days.
3.What payment methods are accepted for AZ432BNTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ432BNTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ432BNTR-E1?
AZ432BNTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ432BNTR-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 AZ432BNTR-E1?
For technical support, including AZ432BNTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ432BNTR-E1 requirements.
6.How does Aetrix verify that AZ432BNTR-E1 is sourced from the original manufacturer or authorized distributors?
All AZ432BNTR-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 AZ432BNTR-E1 meets industry standards.
7.What is the process for return or replacement of AZ432BNTR-E1?
All AZ432BNTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ432BNTR-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 AZ432BNTR-E1 part is unused and in its original packaging.
Return procedure for AZ432BNTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ432BNTR-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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