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Texas Instruments TL432AQDBZTG4
- Part No.:
- TL432AQDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AQDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,192
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Product details
Overview
TL432AQDBZTG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±1% initial tolerance at 25°C, −40°C to +125°C operating range, and 0.2 Ω typical dynamic impedance - used for feedback regulation in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432AQDBZTG4 datasheet, TL432AQDBZTG4 pinout, TL432AQDBZTG4 application, or TL432AQDBZTG4 equivalent, this page provides verified electrical specs, automotive-grade thermal performance, SOT-23-3 terminal mapping, and direct alternative options for high-reliability power control designs.
Technical Context
The TL432AQDBZTG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor - enabling precise voltage setpoint control via external resistor dividers between cathode and reference pins. Its Q-grade rating confirms full −40°C to +125°C operation without derating.
Unlike TL431 variants, TL432AQDBZTG4 uses reversed pinout (CATHODE–REF–ANODE) in DBZ package, requiring PCB layout verification when replacing TL431-based designs. It maintains identical electrical specifications to TL431AQ but demands pin-aware schematic updates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (nominal), ±1% tolerance at 25°C - sets accurate feedback threshold for closed-loop regulation |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial ambient environments |
| Dynamic Impedance | 0.2 Ω typical - ensures stable regulation under fast load transients in switching power supplies |
| Cathode Current Range | 1 mA to 100 mA - supports direct sinking into optocoupler LEDs or error amplifier inputs |
| Reference Input Current | 2–4 µA - enables high-impedance voltage divider networks without significant loading error |
| Temp Drift (VI(dev)) | 14–34 mV over full range - quantifies worst-case reference deviation across temperature |
| Output Noise | Low broadband noise - critical for low-noise feedback paths in precision SMPS |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: CATHODE | Shunt current sink node | Connects to primary-side switch node or optocoupler anode; carries full regulation current |
| Pin 2: REF | Reference input threshold | Compares against external resistor divider; triggers conduction when voltage ≥ 2.495 V |
| Pin 3: ANODE | Common return path | Typically tied to system ground or secondary-side common; defines reference potential |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 2.495 V to 36 V - configured with two external resistors, eliminating need for multiple fixed references |
| Sharp Turn-On Characteristic | Active output circuitry enables fast response to reference threshold crossing - improves transient regulation in flyback converters |
| Low Output Impedance | 0.2 Ω typical - minimizes voltage droop during cathode current changes up to 100 mA |
| Automotive-Qualified Temp Range | −40°C to +125°C - meets AEC-Q100 stress test requirements for under-hood power modules |
| ESD Robustness | ±2000 V HBM - withstands handling and board assembly without protection diodes |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
|
Use Scenario: Secondary-side voltage feedback in isolated 48 V input, 12 V/50 A output server PSU. IC Role / Device Role / Timing Role: Shunt reference providing precise 12 V regulation via optocoupler-coupled error signal to primary controller. Use Value: ±1% initial accuracy and 14–34 mV temp drift ensure tight output tolerance across full operating temperature range. |
Use Scenario: Feedback reference in 3-phase rectified 400 V AC/DC front-end supplying PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting 24 V output with external resistor network and optocoupler isolation. Use Value: 100 mA sink capability directly drives optocoupler LED without buffer, reducing BOM count and layout area. |
| AC Inverter Drive | Servo Drive Control Module |
|
Use Scenario: Auxiliary 15 V rail regulation for gate driver ICs and current sensing amplifiers in 7.5 kW VFD. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing isolated auxiliary supply derived from DC bus snubber network. Use Value: Low 0.2 Ω dynamic impedance prevents output sag during PWM-induced ripple on auxiliary rail. |
Use Scenario: Reference source for analog current loop (4–20 mA) output stage in servo motion controller. IC Role / Device Role / Timing Role: Stable 2.495 V reference feeding DAC output amplifier and current sense comparator. Use Value: 2–4 µA reference input current avoids loading DAC output, preserving linearity and settling time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AQDBZR | Same electrical specs, but TL431 pinout (REF–CATHODE–ANODE) in SOT-23-3 - requires PCB trace rework | Drop-in replacement only if existing layout matches TL431 pin assignment | Select when redesigning legacy TL431-based boards with unchanged footprint constraints |
| TLVH431AQDBZR | Lower 1.24 V reference voltage, 20 V max cathode voltage, 1% tolerance - not adjustable beyond 20 V | Not suitable for >20 V output regulation; limited headroom in high-voltage SMPS | Choose only for low-voltage auxiliary rails where 1.24 V reference suffices and voltage range ≤20 V |
Compared with TL431AQDBZR and TLVH431AQDBZR, TL432AQDBZTG4 uniquely combines Q-grade temperature range, 36 V cathode rating, and TL432-specific pinout - making it the sole option for new automotive or industrial designs requiring full-range operation and SOT-23-3 packaging with cathode-first layout.
Availability
TL432AQDBZTG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432AQDBZTG4 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 technologies, with decades of leadership in precision reference design.
The TL43x family was developed to replace discrete Zener diodes in feedback loops, offering superior stability, lower impedance, and programmable output - targeting power supply regulation, voltage monitoring, and current limiting applications.
FAQ
What is the reference voltage tolerance of TL432AQDBZTG4 at 25°C?
The TL432AQDBZTG4 has a ±1% initial reference voltage tolerance at 25°C, corresponding to the 'A' grade designation. This means its nominal 2.495 V reference falls within 2.470 V to 2.520 V at room temperature, as confirmed in Section 6.10 of the TI datasheet SLVS543S.
Does TL432AQDBZTG4 support operation at 125°C?
Yes, TL432AQDBZTG4 is rated for continuous operation from −40°C to +125°C, indicated by the 'Q' suffix in its part number. This Q-grade qualification is verified per TI's recommended operating conditions and absolute maximum ratings, making it suitable for under-hood automotive and high-temp industrial use cases.
How does the pinout of TL432AQDBZTG4 differ from TL431AQDBZR?
TL432AQDBZTG4 uses CATHODE–REF–ANODE pin order (Pin 1–2–3), whereas TL431AQDBZR uses REF–CATHODE–ANODE. This reversal means direct substitution requires PCB layout modification - TL432AQDBZTG4 cannot be mounted on a TL431 footprint without trace rerouting.
What is the minimum cathode current required for regulation in TL432AQDBZTG4?
The TL432AQDBZTG4 requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in Section 6.10 (Imin parameter). Below this threshold, the device exits active regulation and behaves as an open circuit - critical for designing startup and light-load behavior in power supplies.
Can TL432AQDBZTG4 replace a Zener diode in feedback circuits?
Yes, TL432AQDBZTG4 is explicitly designed as a precision Zener diode replacement. Its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable 2.495–36 V output via external resistors provide superior regulation accuracy and stability compared to standard Zeners - especially in switching power supply feedback paths.
TL432AQDBZTG4 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:
- Discontinued at Digi-Key
- 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
TL432AQDBZTG4 FAQ
1.How can I place an order for TL432AQDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AQDBZTG4 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 TL432AQDBZTG4 reliable?
The price and inventory of TL432AQDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AQDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL432AQDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AQDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AQDBZTG4?
TL432AQDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AQDBZTG4 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 TL432AQDBZTG4?
For technical support, including TL432AQDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AQDBZTG4 requirements.
6.How does Aetrix verify that TL432AQDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL432AQDBZTG4 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 TL432AQDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL432AQDBZTG4?
All TL432AQDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432AQDBZTG4, 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 TL432AQDBZTG4 part is unused and in its original packaging.
Return procedure for TL432AQDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AQDBZTG4 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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