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Texas Instruments TL432AIDBVR
- Part No.:
- TL432AIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL432AIDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
TL432AIDBVR 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, and operation across −40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance, 1–100 mA sink-current capability, and low output noise-enabling accurate feedback in isolated DC/DC converters for industrial AC/DC power supplies.
For engineers reviewing the TL432AIDBVR datasheet, TL432AIDBVR pinout, TL432AIDBVR application, or TL432AIDBVR equivalent, key selection criteria include temperature drift (14 mV over −40°C to 85°C), cathode voltage range (2.5 V to 36 V), reference input current (2–4 µA), and stability under capacitive loads up to 10 µF.
Technical Context
The TL432AIDBVR implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its REF–ANODE–CATHODE pinout (SOT-23-3) differs from TL431 but maintains identical electrical specifications-including 2.495 V nominal Vref, 0.2 Ω dynamic impedance, and sharp turn-on characteristic.
It operates as a two-resistor-programmable voltage source where external resistors set output from Vref to 36 V. The device exhibits low temperature coefficient (VI(dev) = 14 mV over full range) and stable regulation down to 0.4 mA minimum cathode current, making it suitable for high-accuracy feedback loops in switching regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref Tolerance | ±1% at 25°C (A grade) - ensures tight initial accuracy for closed-loop voltage regulation |
| Nominal Vref | 2.495 V - sets base threshold for resistor-divider programming of output voltage |
| Operating Temp | −40°C to +85°C (I grade) - supports industrial ambient conditions without derating |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage variation under load transients |
| Sink Current Range | 1 mA to 100 mA - enables direct interface with optocoupler LEDs or error amplifier outputs |
| Reference Input Current | 2–4 µA - allows high-impedance feedback networks without significant divider error |
| Temp Drift (VI(dev)) | 14 mV over −40°C to +85°C - guarantees ≤0.56% total output variation across temperature |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current/voltage input | Primary current path; connects to regulated rail or optocoupler anode in isolated feedback |
| REF (Pin 2) | Threshold input relative to ANODE | High-impedance sense node; forms voltage divider with external resistors to set output |
| ANODE (Pin 3) | Common reference terminal | Typically tied to system ground or return path; defines reference potential for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output | Adjustable from 2.5 V to 36 V using two external resistors - eliminates need for multiple fixed references |
| Low Dynamic Impedance | 0.2 Ω typical - maintains regulation stability during fast load steps in SMPS feedback paths |
| Low Reference Current | 2–4 µA - enables use with high-value feedback resistors to minimize power loss and thermal drift |
| Wide Temperature Range | −40°C to +85°C operation - qualified for industrial-grade power supply designs without thermal compensation |
| Sharp Turn-On Characteristic | Fast response with minimal hysteresis - improves transient immunity in overvoltage protection circuits |
Applications
| Industrial AC/DC Power Supplies | Rack Server Power Modules |
|---|---|
Use Scenario: Secondary-side voltage regulation in flyback or forward converters with optocoupler-based isolation. IC Role / Device Role / Timing Role: Precision shunt reference providing feedback signal to optocoupler LED, enabling tight ±1% output voltage control. Use Value: Replaces discrete Zener diodes with superior temperature stability (14 mV drift) and lower dynamic impedance (0.2 Ω), reducing output ripple by up to 40%. | Use Scenario: Multi-rail DC/DC converter monitoring and sequencing in 1U/2U server PSUs. IC Role / Device Role / Timing Role: Programmable reference for supervisor ICs or analog comparators verifying 12 V, 5 V, and 3.3 V rail integrity. Use Value: Enables single-BOM support for multiple output voltages via resistor reconfiguration-reducing inventory and test complexity. |
| AC Inverter & VF Drives | Servo Drive Control Modules |
Use Scenario: DC bus voltage sensing and overvoltage protection in motor drive front-end rectifiers. IC Role / Device Role / Timing Role: Shunt reference feeding comparator input to trigger shutdown when bus exceeds 400 V or 600 V thresholds. Use Value: 36 V cathode rating and 100 mA sink capability allow direct interface with high-voltage divider networks without buffer amplifiers. | Use Scenario: Isolated current-sense amplifier reference in three-phase gate driver feedback loops. IC Role / Device Role / Timing Role: Stable 2.495 V reference for delta-sigma modulator biasing and ADC reference scaling. Use Value: Low 2–4 µA reference current prevents loading errors in high-impedance current-sense signal chains, preserving <0.1% measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AIDBVR | Same A-grade tolerance and I-temp range, but TL431 pinout (REF–CATHODE–ANODE) | Requires PCB layout change due to reversed REF/CATHODE pins; not drop-in compatible | Select TL431AIDBVR only if redesigning for legacy TL431 footprint or existing schematic reuse |
| TLVH431AILP | Lower 1.24 V reference, 0.5% initial tolerance, same SOT-23-3 package and pinout | Better suited for low-voltage rails (<5 V); unsuitable for >12 V outputs without level-shifting | Choose TLVH431AILP when designing new 3.3 V or 5 V systems requiring tighter initial accuracy and lower Vref |
Compared with TL431AIDBVR, TL432AIDBVR offers identical electrical performance but requires board-level pin mapping changes; compared with TLVH431AILP, it supports higher output programming range (up to 36 V) at the cost of slightly relaxed initial tolerance (1% vs 0.5%).
Availability
TL432AIDBVR is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, rack server power modules, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432AIDBVR 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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability components.
The TL43x family was designed for precision voltage regulation in isolated and non-isolated power conversion systems, targeting industrial, computing, and motor control applications demanding robust thermal performance and long-term stability.
FAQ
What is the reference voltage tolerance of TL432AIDBVR at 25°C?
The TL432AIDBVR has a reference voltage tolerance of ±1% at 25°C, corresponding to its "A" grade designation. This means its nominal 2.495 V reference falls within 2.470 V to 2.520 V at room temperature, verified per TI's SLVS543S datasheet Section 6.8. This tolerance directly impacts output voltage accuracy in feedback networks using the TL432AIDBVR.
Does TL432AIDBVR support operation at −40°C?
Yes, TL432AIDBVR is rated for operation from −40°C to +85°C (I-grade temperature range). Its electrical characteristics-including reference voltage deviation (VI(dev) = 14 mV), reference input current (2–4 µA), and dynamic impedance (0.2 Ω)-are guaranteed across this full range per Section 6.6 of the TI datasheet. This makes TL432AIDBVR suitable for uncontrolled industrial environments.
What is the maximum cathode voltage rating for TL432AIDBVR?
The absolute maximum cathode voltage (VKA) for TL432AIDBVR is 37 V, with recommended operating range from Vref (≈2.5 V) to 36 V. Exceeding 37 V risks permanent damage. This rating enables direct use in 24 V, 36 V, and 48 V intermediate bus applications when paired with appropriate external resistors and current limiting.
Can TL432AIDBVR replace a Zener diode in feedback circuits?
Yes, TL432AIDBVR is explicitly designed as a precision replacement for Zener diodes in voltage regulation and feedback applications. Its 0.2 Ω dynamic impedance, sharp turn-on, and 1% initial tolerance provide significantly better regulation accuracy and temperature stability than standard Zeners-especially critical in isolated flyback converters where TL432AIDBVR drives optocoupler LEDs.
What is the minimum cathode current required for regulation in TL432AIDBVR?
The TL432AIDBVR requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, per Section 6.8 of the TI datasheet. Below this threshold, the device exits active regulation and behaves as an open circuit. Designers must ensure feedback network and optocoupler LED current exceed 0.4 mA under all operating conditions, including light-load and startup.
TL432AIDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
TL432AIDBVR FAQ
1.How can I place an order for TL432AIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AIDBVR 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 TL432AIDBVR reliable?
The price and inventory of TL432AIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AIDBVR is usually 5 days.
3.What payment methods are accepted for TL432AIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AIDBVR?
TL432AIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AIDBVR 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 TL432AIDBVR?
For technical support, including TL432AIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AIDBVR requirements.
6.How does Aetrix verify that TL432AIDBVR is sourced from the original manufacturer or authorized distributors?
All TL432AIDBVR 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 TL432AIDBVR meets industry standards.
7.What is the process for return or replacement of TL432AIDBVR?
All TL432AIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL432AIDBVR, 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 TL432AIDBVR part is unused and in its original packaging.
Return procedure for TL432AIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AIDBVR Tags
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TL431AIDBZR
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