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Texas Instruments TL432ACDBZR
- Part No.:
- TL432ACDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432ACDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,438
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Product details
Overview
TL432ACDBZR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance at 25°C, 1 mA to 100 mA sink-current capability, and operation across −40°C to 85°C. It serves as a stable feedback element in isolated DC-DC converters, AC/DC power supplies, and servo drive control modules.
For engineers reviewing the TL432ACDBZR datasheet, TL432ACDBZR pinout, TL432ACDBZR application, or TL432ACDBZR equivalent, key selection criteria include its A-grade (1%) accuracy, I-temp range compatibility, low 0.2 Ω dynamic impedance, and SOT-23-3 footprint suitability for space-constrained power regulation designs.
Technical Context
The TL432ACDBZR implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its REF–ANODE–CATHODE pinout differs from TL431, enabling distinct PCB layout configurations while maintaining identical electrical behavior and functional modes.
It operates as a two-resistor-programmable voltage source between 2.5 V and 36 V, with sharp turn-on characteristics and low temperature drift (6 mV over 0°C–70°C, 14 mV over −40°C–85°C). The device achieves stability via external compensation and exhibits low output noise and high PSRR in closed-loop feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (nominal), ±0.5% tolerance at 25°C - enables precise feedback setpoint in regulated power supplies |
| Operating Temperature | −40°C to +85°C - supports industrial-grade thermal reliability without derating |
| Sink Current Range | 1 mA to 100 mA - provides sufficient drive for optocoupler biasing and error amplifier interfaces |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage variation under load transients |
| Reference Input Current | 2–4 µA - allows high-value resistor networks (e.g., 100 kΩ–1 MΩ) without significant divider error |
| Temperature Drift | 14 mV max over full range - guarantees <±0.05% output variation across operating temperature |
| Output Noise | Low broadband noise - critical for high-accuracy sensing and low-noise feedback loops |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Shunt current/voltage input node | Connects to regulated output rail; sinks current to maintain reference voltage at REF |
| REF | Threshold input relative to ANODE | Compares against internal 2.495 V bandgap; sets regulation point via external resistor divider |
| ANODE | Common reference ground terminal | Typically tied to system ground or return path; defines voltage reference for REF input |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.5 V to 36 V using two external resistors - replaces discrete Zener diodes with higher accuracy and stability |
| Sharp Turn-On Characteristic | Fast regulation onset below threshold - improves transient response in switching power supply feedback loops |
| Low Dynamic Impedance | 0.2 Ω typical - minimizes output voltage deviation during cathode current changes up to 100 mA |
| Wide Operating Temperature | −40°C to +85°C - qualified for industrial environments without thermal compensation circuitry |
| Low Reference Input Current | 2–4 µA - reduces power loss and resistor-divider loading error in high-impedance feedback networks |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in isolated flyback converters for 48 V intermediate bus regulation. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage setpoint to optocoupler-driven PWM controller. Use Value: Enables ±1% output regulation across line/load/temperature with no secondary-side sensing. |
Use Scenario: Voltage regulation in 3 kW industrial rectifier with PFC front-end and LLC resonant stage. IC Role / Device Role / Timing Role: Feedback reference for secondary-side synchronous rectifier controller. Use Value: Maintains stable 12 V/24 V outputs under wide ambient temperature swings and load steps. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC-link voltage monitoring and overvoltage protection reference in 3-phase VFDs. IC Role / Device Role / Timing Role: Precision threshold detector feeding comparator inputs for fault logic. Use Value: Reduces false trips by limiting reference drift to ≤14 mV over −40°C to +85°C. |
Use Scenario: Isolated current-sense amplifier reference in motor phase current feedback loop. IC Role / Device Role / Timing Role: Stable bias reference for delta-sigma modulator input stage. Use Value: Improves current measurement accuracy to ±0.5% by minimizing reference-induced offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Same accuracy grade and temperature range, but TL431 pinout (REF–ANODE–CATHODE) | Requires PCB layout revision due to reversed CATHODE/REF pin positions | Select when legacy TL431 footprint reuse is prioritized over TL432-specific routing |
| TL432AIDBZR | Identical functionality and pinout, but rated for −40°C to +125°C (Q-temp grade) | Supports extended temperature operation in automotive or high-ambient industrial enclosures | Choose for designs requiring guaranteed performance beyond +85°C ambient |
Compared with TL432ACDBZR, TL431ACDBZR demands board redesign due to incompatible pin mapping, while TL432AIDBZR extends thermal capability at no cost to accuracy or footprint - making it suitable for future-proofing in harsh environments.
Availability
TL432ACDBZR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for TL432ACDBZR 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 and embedded processing technologies, with decades of expertise in precision voltage references and power management ICs.
The TL43x family was designed for high-accuracy, low-drift shunt regulation in isolated power supplies, feedback loops, and voltage monitoring systems - emphasizing robustness, wide temperature operation, and drop-in replaceability for Zener diodes.
FAQ
What is the reference voltage tolerance of TL432ACDBZR at 25°C?
The TL432ACDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal 2.495 V output with minimum 2.470 V and maximum 2.520 V under specified test conditions. This A-grade accuracy is confirmed in Section 6.8 of the TI datasheet SLVS543S and applies specifically to the TL432ACDBZR variant in SOT-23-3 packaging.
How does TL432ACDBZR differ from TL431ACDBZR in pin configuration?
TL432ACDBZR uses a CATHODE–REF–ANODE pinout in SOT-23-3, whereas TL431ACDBZR uses REF–ANODE–CATHODE. This reversal means direct PCB substitution is not possible without layout modification. Both share identical electrical specifications, but TL432ACDBZR's pin mapping optimizes routing for certain optocoupler-coupled feedback topologies.
What is the maximum cathode current supported by TL432ACDBZR?
TL432ACDBZR supports a continuous cathode current range of 1 mA to 100 mA per Section 6.4 of the datasheet. At 100 mA, thermal limits require careful PCB copper area design due to its SOT-23-3 package's 206°C/W junction-to-ambient thermal resistance - derating is recommended above 60 mA in still-air conditions.
Can TL432ACDBZR be used in place of a Zener diode?
Yes, TL432ACDBZR functions as a superior replacement for Zener diodes in voltage regulation and reference applications. Its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and ±0.5% initial tolerance provide significantly better regulation accuracy, temperature stability, and load transient response than standard Zeners - especially in feedback networks of switching power supplies.
What is the operating temperature range for TL432ACDBZR?
TL432ACDBZR is rated for operation from −40°C to +85°C (I-temp grade), as defined in Section 4 of the TI datasheet. This range is validated across all electrical parameters including reference voltage drift (≤14 mV), input current deviation (≤2.5 µA), and dynamic impedance stability - making it suitable for industrial power electronics without additional thermal compensation.
TL432ACDBZR 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432ACDBZR FAQ
1.How can I place an order for TL432ACDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432ACDBZR 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 TL432ACDBZR reliable?
The price and inventory of TL432ACDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432ACDBZR is usually 5 days.
3.What payment methods are accepted for TL432ACDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432ACDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432ACDBZR?
TL432ACDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432ACDBZR 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 TL432ACDBZR?
For technical support, including TL432ACDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432ACDBZR requirements.
6.How does Aetrix verify that TL432ACDBZR is sourced from the original manufacturer or authorized distributors?
All TL432ACDBZR 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 TL432ACDBZR meets industry standards.
7.What is the process for return or replacement of TL432ACDBZR?
All TL432ACDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432ACDBZR, 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 TL432ACDBZR part is unused and in its original packaging.
Return procedure for TL432ACDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432ACDBZR Tags
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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