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Texas Instruments TL431BIDBVR
- Part No.:
- TL431BIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431BIDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,200
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Product details
Overview
TL431BIDBVR 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, 14 mV max temperature drift over −40°C to 125°C, and 0.2 Ω typical dynamic impedance. It operates as an adjustable feedback element in isolated DC-DC converters and secondary-side regulation circuits.
For engineers reviewing the TL431BIDBVR datasheet, TL431BIDBVR pinout, TL431BIDBVR application, or TL431BIDBVR equivalent, key selection criteria include its Q-grade temperature range (−40°C to 125°C), B-grade accuracy, SOT-23-3 footprint compatibility, and sink-current capability up to 100 mA in high-reliability power control loops.
Technical Context
The TL431BIDBVR implements a three-terminal adjustable shunt regulator architecture with an internal precision op-amp and NPN transistor output stage. Its reference input (REF) compares against an internal 2.495 V bandgap, controlling cathode current flow between CATHODE and ANODE terminals to maintain regulated voltage across external resistive dividers.
It features active output circuitry enabling sharp turn-on characteristics and low 0.2 Ω dynamic impedance below 1 kHz, making it suitable for closed-loop feedback in switching power supplies where stability and noise rejection are critical. The device supports adjustable output voltages from 2.495 V to 36 V using two external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (0.5% tolerance at 25°C); sets precise feedback threshold in voltage regulation loops |
| Temp Range | −40°C to +125°C (Q-grade); enables use in automotive under-hood and industrial motor drive environments |
| Dynamic Impedance | 0.2 Ω typical (≤1 kHz); ensures stable regulation under fast load transients without external compensation |
| Sink Current | 1 mA to 100 mA; supports direct interface with optocoupler LEDs and error amplifier outputs |
| Ref Input Current | 2–4 µA; minimizes divider resistor power loss and thermal drift in high-impedance feedback networks |
| Output Noise | Low broadband noise (typ. 220 nV/√Hz @ 1 kHz); preserves signal integrity in precision analog feedback paths |
| Min Cathode Current | 0.4–0.7 mA; defines lowest operating point for reliable regulation in low-power standby modes |
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 (Pin 1) | Shunt current output node | Connects to primary-side controller via optocoupler; sinks current to regulate output voltage |
| REF (Pin 2) | Precision reference input | High-impedance node comparing external divider voltage to internal 2.495 V bandgap |
| ANODE (Pin 3) | Common return path | Typically tied to system ground or negative rail; forms current return path for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Initial accuracy | ±0.5% at 25°C (B grade) - enables tight output voltage tolerance without post-manufacturing trimming |
| Temperature stability | 14 mV max deviation over −40°C to 125°C - maintains regulation accuracy across automotive and industrial thermal cycles |
| Low dynamic impedance | 0.2 Ω typical - suppresses ripple and improves transient response in feedback-controlled SMPS |
| Wide adjustment range | 2.495 V to 36 V - supports single-part design across multiple output voltages in multi-rail systems |
| Low reference current | 2–4 µA - allows use of high-value feedback resistors to minimize power loss and self-heating errors |
Applications
| AC Inverter Control | Rack Server PSU |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 3-phase AC inverter gate driver power supplies. IC Role / Device Role / Timing Role: Shunt reference providing feedback to optocoupler-driven PWM controller for output voltage stabilization. Use Value: Maintains ±1% output regulation across −40°C to 125°C ambient, meeting IEC 61800-5-1 industrial safety requirements. |
Use Scenario: Precision voltage monitoring in redundant 12 V/54 V intermediate bus converters for datacenter servers. IC Role / Device Role / Timing Role: Adjustable shunt reference setting feedback threshold for digital PMBus-controlled DC-DC modules. Use Value: Enables single-component solution for multiple output rails while supporting TI UCD3138-based adaptive loop compensation. |
| Industrial Servo Drive | Notebook Adapter Feedback |
Use Scenario: Isolated auxiliary supply regulation in servo motor control modules requiring functional safety compliance. IC Role / Device Role / Timing Role: Programmable reference generating stable 5 V bias for isolated gate drivers and position encoder interfaces. Use Value: Q-grade temperature rating and 0.5% accuracy ensure ASIL-B compliant voltage supervision without derating. |
Use Scenario: Output voltage regulation in compact 65 W GaN-based notebook AC adapters. IC Role / Device Role / Timing Role: Shunt reference feeding optocoupler in flyback converter feedback path to maintain ±0.5% CV accuracy. Use Value: Low 0.2 Ω impedance and 2.495 V reference enable fast transient recovery during USB-C PD negotiation bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVR | Same B-grade accuracy and Q-temp rating, but SOT-23-3 package with identical pinout | No functional difference; TL431BQDBVR is alternate orderable part number for same device | Select TL431BQDBVR only if required by procurement policy; electrically and mechanically identical to TL431BIDBVR |
| TLVH431BQDBVR | Lower 1.24 V reference voltage, 0.5% tolerance, same Q-temp range, higher 20 µA max reference current | Requires redesign of feedback divider; suited for sub-2.5 V regulation or low-voltage logic supply monitoring | Choose TLVH431BQDBVR when 1.24 V reference is needed; not drop-in compatible due to different Vref and Iref |
Compared with TL431BIDBVR, TL431BQDBVR offers identical performance in the same package, while TLVH431BQDBVR provides lower reference voltage at the cost of higher reference current and non-interchangeable feedback network design.
Availability
TL431BIDBVR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC conversion, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BIDBVR 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 reference and power management ICs.
The TL431 product line delivers programmable shunt references optimized for isolated power supply feedback, offering grade-specific accuracy and temperature stability for industrial, automotive, and computing applications.
FAQ
What is the reference voltage tolerance of TL431BIDBVR at 25°C?
The TL431BIDBVR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal value with ±12.5 mV deviation. This B-grade accuracy is specified in the Electrical Characteristics table for TL431BQ devices and confirmed across all Q-temp variants including TL431BIDBVR per TI SLVS543S Rev May 2024.
Does TL431BIDBVR support operation at 125°C?
Yes, TL431BIDBVR is rated for operation from −40°C to +125°C (Q-grade). Its maximum temperature drift is 14 mV over this full range, verified in the VI(dev) parameter for TL431BQ devices in Section 6.13 of the datasheet, making it suitable for under-hood automotive and high-temperature industrial environments.
What is the dynamic impedance of TL431BIDBVR and why does it matter?
The TL431BIDBVR has a typical dynamic impedance of 0.2 Ω at frequencies ≤1 kHz. This low value ensures minimal voltage variation under changing load conditions in feedback loops, directly improving regulation accuracy and transient response in switching power supplies without requiring additional compensation components.
Can TL431BIDBVR replace a Zener diode in voltage regulation circuits?
Yes, TL431BIDBVR is explicitly designed as a superior replacement for Zener diodes in precision regulation applications. Its sharp turn-on characteristic, adjustable 2.495–36 V output range, and 0.2 Ω dynamic impedance provide better stability, lower temperature drift, and higher accuracy than discrete Zener solutions in on-board regulation and SMPS feedback paths.
What are the absolute maximum ratings for cathode voltage and current in TL431BIDBVR?
The TL431BIDBVR has an absolute maximum cathode voltage (VKA) of 37 V and continuous cathode current (IKA) range of −100 mA to +150 mA. These ratings are defined in Section 6.1 of the datasheet and apply regardless of grade or package; operation beyond these limits risks permanent device damage.
TL431BIDBVR 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:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431BIDBVR FAQ
1.How can I place an order for TL431BIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDBVR 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 TL431BIDBVR reliable?
The price and inventory of TL431BIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDBVR is usually 5 days.
3.What payment methods are accepted for TL431BIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDBVR?
TL431BIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDBVR 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 TL431BIDBVR?
For technical support, including TL431BIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDBVR requirements.
6.How does Aetrix verify that TL431BIDBVR is sourced from the original manufacturer or authorized distributors?
All TL431BIDBVR 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 TL431BIDBVR meets industry standards.
7.What is the process for return or replacement of TL431BIDBVR?
All TL431BIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDBVR, 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 TL431BIDBVR part is unused and in its original packaging.
Return procedure for TL431BIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDBVR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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