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Texas Instruments TL432AQDBZT
- Part No.:
- TL432AQDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AQDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
TL432AQDBZT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.470–2.520 V reference voltage at 25°C with ±1% initial accuracy (A grade), −40°C to +125°C operating range (Q grade), and 0.2 Ω typical dynamic impedance. It serves as an adjustable feedback element in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432AQDBZT datasheet, TL432AQDBZT pinout, TL432AQDBZT application, or TL432AQDBZT equivalent, key selection criteria include automotive-grade temperature stability, low-output-impedance regulation for tight feedback loops, and compatibility with standard resistor-divider configurations for output voltages from 2.5 V to 36 V.
Technical Context
The TL432AQDBZT implements a three-terminal shunt regulator architecture with an internal error amplifier, reference voltage source, and output transistor. Its REF pin senses voltage relative to ANODE, enabling precise closed-loop control of cathode current (IKA) to maintain stable VKA across load and line variations.
Unlike the TL431, the TL432AQDBZT uses a distinct pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - confirmed for DBZ (SOT-23-3) packaging. This configuration supports direct integration into optocoupler-based feedback networks without external signal inversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.470–2.520 V at 25°C; enables accurate 2.5 V–36 V adjustable output setting via two external resistors |
| Initial Accuracy | ±1% (A grade); ensures minimal calibration overhead in production power supply designs |
| Temp Range | −40°C to +125°C (Q grade); qualified for under-hood automotive and industrial motor drive applications |
| Dynamic Impedance | 0.2 Ω typical; provides high loop gain and fast transient response in feedback paths |
| Voltage Deviation | 14–34 mV over full temperature range; guarantees stable regulation without external compensation |
| Sink Current Range | 1–100 mA; supports direct driving of optocoupler LEDs or small-signal transistors |
| Output Noise | Low broadband noise; maintains signal integrity in precision feedback sensing |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current input / voltage sense node | Connects to high-side output rail; sinks regulated current to maintain VKA at setpoint |
| Pin 2 (REF) | Reference threshold input | Senses divider voltage relative to ANODE; triggers regulation when ≥ Vref |
| Pin 3 (ANODE) | Common return / ground reference | Typically tied to system ground or isolated secondary return; defines reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 2.5 V to 36 V via external resistor divider - eliminates need for multiple fixed-voltage references |
| Sharp Turn-On Characteristic | Fast activation below Vref threshold - enables clean startup and avoids regulation hysteresis |
| Low Temperature Drift | 14–34 mV deviation over −40°C to +125°C - ensures stable feedback across thermal extremes |
| High Sink Capability | 100 mA max cathode current - drives optocouplers directly without buffer transistors |
| Stable Under Capacitive Loads | Validated stability with up to 10 µF capacitance - simplifies EMI filter integration in SMPS outputs |
Applications
| AC Inverter Drive Feedback | Rack Server VRM Monitoring |
|---|---|
Use Scenario: Closed-loop voltage regulation in 3-phase AC inverter output stage using optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to control optocoupler LED current and thus primary-side PWM duty cycle. Use Value: Enables ±1% output voltage accuracy across −40°C to +125°C ambient, meeting IEC 61800-3 immunity requirements. |
Use Scenario: Secondary-side voltage monitoring in multi-phase server VRMs with digital PMBus interface. IC Role / Device Role / Timing Role: Precision reference for ADC input scaling and fault-detection comparators in power rail supervisors. Use Value: Delivers stable 2.5 V reference independent of supply ripple, ensuring accurate rail telemetry at 12 V, 5 V, and 3.3 V outputs. |
| Industrial Servo Power Supply | Notebook Adapter Feedback |
Use Scenario: Isolated flyback converter powering servo motor control logic and gate drivers. IC Role / Device Role / Timing Role: Adjustable shunt reference setting 15 V output via resistor divider, feeding optocoupler feedback path. Use Value: Maintains <±2% output tolerance over 100% load step and 85–265 VAC input range due to low dynamic impedance. |
Use Scenario: Compact 65 W USB-C PD adapter with primary-side regulation and secondary-side feedback. IC Role / Device Role / Timing Role: TL432AQDBZT configures 20 V output via 1% tolerance resistors, interfacing with PC817 optocoupler. Use Value: SOT-23-3 footprint minimizes PCB area while supporting 100 kHz switching frequency without instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AQDBZT | Same electrical specs but TL431 pinout (Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE) | Requires PCB layout revision to accommodate reversed REF/ANODE/CATHODE connections | Select only if legacy TL431 layout reuse is prioritized over pinout compatibility |
| TLVH431AQDBZR | Lower 1.24 V reference, 2.5% initial accuracy, same Q-temp grade and SOT-23-3 package | Not suitable for 2.5 V+ output settings without additional amplification | Choose when lower reference voltage or cost sensitivity outweighs 1% accuracy requirement |
Compared with TL431AQDBZT and TLVH431AQDBZR, TL432AQDBZT uniquely combines A-grade accuracy, Q-temp qualification, and TL432-specific pinout-making it optimal for new designs requiring drop-in compatibility with TL432-based reference circuits and automotive thermal robustness.
Availability
TL432AQDBZT is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432AQDBZT 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in precision reference and power control technologies.
The TL43x family was designed specifically for high-reliability shunt regulation in isolated power supplies, offering pin-compatible alternatives across accuracy grades (B/A/standard) and temperature ranges (C/I/Q) to simplify design scalability.
FAQ
What is the reference voltage tolerance of TL432AQDBZT at 25°C?
The TL432AQDBZT has a reference voltage tolerance of ±1% at 25°C, corresponding to a 2.470 V to 2.520 V range. This A-grade accuracy is specified in Section 6.10 of the TI datasheet SLVS543S and applies exclusively to the Q-temp (−40°C to +125°C) version in SOT-23-3 (DBZ) packaging. The TL432AQDBZT achieves this without external trimming.
How does the TL432AQDBZT pinout differ from TL431AQDBZT?
The TL432AQDBZT uses Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE in the SOT-23-3 (DBZ) package, whereas TL431AQDBZT uses Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. This reversal is intentional and documented in TI's Pin Configuration and Functions section (page 4). Interchanging them without layout modification causes immediate regulation failure.
What is the maximum cathode current supported by TL432AQDBZT?
The TL432AQDBZT supports a continuous cathode current (IKA) range of 1 mA to 100 mA per Section 6.4 of the datasheet. At 100 mA, power dissipation must remain within thermal limits: RθJA = 206°C/W for DBZ package, requiring careful PCB copper area design to avoid exceeding 150°C junction temperature at +125°C ambient.
Can TL432AQDBZT replace a Zener diode in feedback circuits?
Yes - the TL432AQDBZT replaces Zener diodes in precision feedback paths due to its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and stable 2.5 V reference. Unlike Zeners, it delivers consistent performance across temperature and current, eliminating drift-related calibration in AC/DC adapters and servo power supplies where TL432AQDBZT is deployed.
Is TL432AQDBZT qualified for automotive applications?
Yes - the "Q" suffix in TL432AQDBZT denotes qualification for −40°C to +125°C operation per AEC-Q100 stress testing guidelines. TI documents this in the Device Comparison Table (page 3) and Recommended Operating Conditions (Section 6.4), confirming suitability for under-hood power modules, EV charging interfaces, and ADAS subsystems requiring TL432AQDBZT's thermal stability.
TL432AQDBZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- 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
TL432AQDBZT FAQ
1.How can I place an order for TL432AQDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AQDBZT 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 TL432AQDBZT reliable?
The price and inventory of TL432AQDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AQDBZT is usually 5 days.
3.What payment methods are accepted for TL432AQDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AQDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AQDBZT?
TL432AQDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AQDBZT 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 TL432AQDBZT?
For technical support, including TL432AQDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AQDBZT requirements.
6.How does Aetrix verify that TL432AQDBZT is sourced from the original manufacturer or authorized distributors?
All TL432AQDBZT 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 TL432AQDBZT meets industry standards.
7.What is the process for return or replacement of TL432AQDBZT?
All TL432AQDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL432AQDBZT, 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 TL432AQDBZT part is unused and in its original packaging.
Return procedure for TL432AQDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AQDBZT Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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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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