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Texas Instruments TL432AIDBZR
- Part No.:
- TL432AIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,355
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Product details
Overview
TL432AIDBZR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial tolerance at 25°C, 2.495 V nominal reference voltage, −40°C to 125°C operating temperature range (Q-grade), and 0.2 Ω typical dynamic impedance. It replaces Zener diodes in feedback loops of isolated DC/DC converters and AC/DC power supplies.
For engineers reviewing the TL432AIDBZR datasheet, TL432AIDBZR pinout, TL432AIDBZR application, or TL432AIDBZR equivalent, key selection criteria include its Q-grade automotive temperature rating, SOT-23-3 footprint compatibility with space-constrained designs, adjustable output (2.5 V to 36 V), low 1 µA max reference input current, and stability under capacitive loads up to 10 µF.
Technical Context
The TL432AIDBZR implements a precision bandgap-based error amplifier with internal reference, configured as a three-terminal shunt regulator. Its REF–ANODE–CATHODE pinout differs from TL431, enabling direct integration into compact feedback networks without external inversion logic.
It operates with cathode-to-anode voltage (VKA) from 2.5 V to 36 V and sink current from 1 mA to 100 mA. Thermal drift is specified at 14 mV over −40°C to 125°C (Q-grade), and dynamic impedance remains ≤0.5 Ω up to 1 kHz - critical for maintaining loop stability in high-frequency switching regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal; sets precise feedback threshold for output regulation in SMPS circuits |
| Initial Tolerance | ±1% at 25°C (A-grade); ensures tight output voltage accuracy without post-manufacturing trimming |
| Temp Range | −40°C to +125°C (Q-grade); supports under-hood automotive and industrial ambient conditions |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage perturbation during load transients |
| Sink Current Range | 1 mA to 100 mA; enables direct drive of optocoupler LEDs in isolated flyback controllers |
| Ref Input Current | 2–4 µA typical; reduces resistor-divider power loss and improves efficiency in high-impedance feedback networks |
| Output Noise | Low broadband noise; maintains signal integrity in precision voltage monitoring paths |
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 output node | Connected to primary-side feedback network; sinks current to regulate output voltage |
| REF | Reference input threshold | Compares against external resistor divider; triggers regulation when voltage reaches ~2.495 V |
| ANODE | Common return path | Typically tied to system ground or secondary-side common; defines voltage reference point for REF terminal |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 2.5 V to 36 V via two-resistor divider - eliminates need for multiple fixed-reference parts |
| Thermal Stability | 14 mV max deviation over −40°C to +125°C - ensures consistent regulation across automotive thermal cycles |
| Low Dynamic Impedance | 0.2 Ω typical - preserves loop phase margin in high-bandwidth power supply feedback paths |
| High Sink Capability | 100 mA max cathode current - directly drives standard PC817/PC817x optocouplers without buffer transistors |
| Low Input Bias Current | 4 µA max reference input current - enables use of high-value feedback resistors (>1 MΩ) to reduce standby power |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage sensing in 48 V input, 12 V/50 A isolated DC/DC modules for data center servers. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop, setting precise 12.0 V ±1% output. Use Value: Enables compliance with PMBus v1.3 voltage accuracy requirements while supporting 100 kHz+ switching frequencies. | Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/20 A industrial power supplies. IC Role / Device Role / Timing Role: Precision shunt reference driving linear optocoupler for galvanic isolation and EMI immunity. Use Value: Maintains ±1.2% total output accuracy over full load (10–100%) and temperature (−25°C to +70°C). |
| AC Inverter Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and protection circuitry in 3-phase 400 V AC inverters for HVAC compressors. IC Role / Device Role / Timing Role: Reference element in overvoltage comparator stage, triggering shutdown at 450 V DC. Use Value: Q-grade temperature rating ensures reliable trip-point stability during sustained motor overload heating. | Use Scenario: Feedback reference for dual-loop (current + velocity) control in 200 V servo amplifiers. IC Role / Device Role / Timing Role: Stable voltage reference for analog-to-digital converter biasing and PWM comparator thresholds. Use Value: Low 0.2 Ω impedance prevents gain drift in current-sense amplifier feedback paths during rapid torque transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AIDBZR | Same A-grade tolerance and Q-temp rating, but TL431 pinout (REF–ANODE–CATHODE) | Requires PCB layout revision due to reversed REF/ANODE/CATHODE assignment | Select only if legacy TL431 footprint reuse is required and layout change is acceptable |
| TLVH431AQDBVR | Lower 1.24 V reference, 0.5% B-grade tolerance, same SOT-23-3 package and Q-temp rating | Not drop-in compatible for 2.5 V+ reference designs; requires full feedback resistor recalculation | Choose when lower reference voltage enables higher resistor values or tighter initial accuracy is mandatory |
Compared with TL431AIDBZR, TL432AIDBZR offers identical electrical specs but inverted pinout - eliminating need for external signal inversion in new designs. Versus TLVH431AQDBVR, it provides higher reference voltage and relaxed tolerance, simplifying feedback design for 5 V/12 V/24 V outputs.
Availability
TL432AIDBZR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply, long-term lifecycle support, and automotive-grade temperature performance.
Supply support for TL432AIDBZR 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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive components.
The TL432 product line delivers precision programmable shunt references optimized for isolated power supply feedback, offering grade-specific tolerances and extended temperature operation for mission-critical regulation tasks.
FAQ
What is the reference voltage tolerance of TL432AIDBZR at 25°C?
The TL432AIDBZR has a reference voltage tolerance of ±1% at 25°C, corresponding to its A-grade specification. This means the nominal 2.495 V reference falls within 2.470 V to 2.520 V at room temperature, enabling accurate output voltage setting in regulated power supplies without calibration.
How does the TL432AIDBZR pinout differ from TL431 devices?
The TL432AIDBZR uses a CATHODE–REF–ANODE pinout (Pin 1–2–3) in the SOT-23-3 package, whereas TL431 variants use REF–ANODE–CATHODE. This inversion allows direct connection to optocoupler anodes without external transistor buffering in many isolated feedback topologies, reducing component count in TL432AIDBZR-based designs.
What is the maximum operating temperature range for TL432AIDBZR?
The TL432AIDBZR is rated for operation from −40°C to +125°C, meeting the Q-grade automotive temperature specification. This extended range ensures reliable performance in under-hood automotive ECUs, industrial motor drives, and outdoor power equipment where ambient temperatures exceed commercial-grade limits.
Can TL432AIDBZR replace a Zener diode in voltage regulation circuits?
Yes, TL432AIDBZR can directly replace Zener diodes in shunt regulation applications. Its sharp turn-on characteristic, low 0.2 Ω dynamic impedance, and precise 2.495 V reference provide superior regulation accuracy, lower temperature drift, and better stability than discrete Zeners - especially in adjustable supplies and switching regulator feedback paths.
What is the minimum cathode current required for regulation in TL432AIDBZR?
The TL432AIDBZR requires a minimum cathode current of 0.4 mA to maintain regulation, as specified in its electrical characteristics table. This low Imin enables stable operation even with high-impedance feedback dividers or low-power optocouplers, improving efficiency in standby and light-load conditions.
TL432AIDBZR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432AIDBZR FAQ
1.How can I place an order for TL432AIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AIDBZR 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 TL432AIDBZR reliable?
The price and inventory of TL432AIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AIDBZR is usually 5 days.
3.What payment methods are accepted for TL432AIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AIDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AIDBZR?
TL432AIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AIDBZR 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 TL432AIDBZR?
For technical support, including TL432AIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AIDBZR requirements.
6.How does Aetrix verify that TL432AIDBZR is sourced from the original manufacturer or authorized distributors?
All TL432AIDBZR 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 TL432AIDBZR meets industry standards.
7.What is the process for return or replacement of TL432AIDBZR?
All TL432AIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432AIDBZR, 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 TL432AIDBZR part is unused and in its original packaging.
Return procedure for TL432AIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AIDBZR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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