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Texas Instruments TL431BIDCKT
- Part No.:
- TL431BIDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TL431BIDCKT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,064
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Product details
Overview
TL431BIDCKT from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 (DCK) 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 voltage-monitoring circuits for industrial AC/DC power supplies.
For engineers reviewing the TL431BIDCKT datasheet, TL431BIDCKT pinout, TL431BIDCKT application, or TL431BIDCKT equivalent, this page delivers verified electrical specs, thermal performance data, real-world stability boundaries, and validated alternative options for high-reliability power regulation design.
Technical Context
The TL431BIDCKT implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its cathode-anode voltage range spans 2.5 V to 36 V, enabling precise output setting via two external resistors while maintaining sharp turn-on characteristics comparable to Zener diodes.
Designed for Q-grade automotive and industrial operation (−40°C to 125°C), it features low 2–4 µA reference input current, 0.4–0.7 mA minimum cathode current for regulation, and stable sink-current capability from 1 mA to 100 mA - all with confirmed 259 °C/W junction-to-ambient thermal resistance in the DCK package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV (0.5% tolerance at 25°C); sets accurate feedback threshold in closed-loop power supplies |
| Temp Drift (VI(dev)) | 14 mV max over −40°C to 125°C; ensures <±0.056%/°C long-term output stability without external compensation |
| Dynamic Impedance | 0.2 Ω typical at 1 kHz; provides low-noise, high-stiffness reference node for sensitive feedback networks |
| Cathode Current Range | 1 mA to 100 mA sink capability; supports direct drive of optocoupler LEDs in isolated flyback controllers |
| Operating Temp Range | −40°C to +125°C (Q-grade); qualified for under-hood automotive and industrial motor drive applications |
| Package Thermal Resistance | RθJA = 259 °C/W (SOT-23-3 DCK); enables 300 mW max power dissipation at 50°C ambient without heatsink |
Pinout & Package
SOT-23-3 (DCK) package: 2.90 mm × 1.30 mm body, gull-wing leads, JEDEC MO-178AC compliant. RoHS-compliant, Pb-free matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output | Connects to primary-side feedback node; sinks regulated current to maintain reference voltage at Pin 2 |
| Pin 2 (REF) | Reference input | High-impedance (2–4 µA) threshold input; compares external resistor divider voltage against internal 2.495 V bandgap |
| Pin 3 (ANODE) | Common return | Typically grounded or tied to system common; defines voltage reference point for both REF and CATHODE terminals |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial accuracy (B grade) | Reduces need for post-manufacturing trimming in precision power supplies and battery management systems |
| −40°C to 125°C operation (Q grade) | Enables use in engine control units, servo drives, and outdoor industrial inverters without derating |
| 0.2 Ω dynamic impedance | Maintains stable regulation under fast load transients in switching regulators with >100 kHz bandwidth |
| Low 2–4 µA reference current | Minimizes resistor-divider power loss and improves efficiency in high-impedance feedback networks |
| Stability-tested up to 100 µF load capacitance | Supports robust operation with large ESR electrolytic capacitors in cost-sensitive AC/DC adapters |
Applications
| Rack Server Power | Industrial AC/DC Supply |
|---|---|
Use Scenario: Secondary-side voltage regulation in isolated 48 V to 12 V/5 V DC/DC modules for telecom servers. IC Role / Device Role / Timing Role: Adjustable shunt reference providing feedback to optocoupler-driven PWM controller. Use Value: Enables ±1% output accuracy across line/load/temperature with no external op-amp or compensation network. |
Use Scenario: Output voltage sensing and overvoltage protection in 300 W industrial open-frame power supplies. IC Role / Device Role / Timing Role: Precision voltage monitor triggering latch-off during fault conditions. Use Value: 14 mV temp drift ensures OVP threshold remains within 0.5% over full operating range, eliminating false trips. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage scaling and analog signal conditioning in 3-phase IGBT gate driver feedback loops. IC Role / Device Role / Timing Role: High-stability reference for ADC input scaling and current-sense amplifier biasing. Use Value: 0.2 Ω impedance prevents noise coupling into sensitive analog front-ends during high dv/dt switching events. |
Use Scenario: Position encoder supply regulation and resolver excitation voltage stabilization in robotic servo amplifiers. IC Role / Device Role / Timing Role: Low-drift reference source for precision DACs controlling motor phase currents. Use Value: 0.5% initial tolerance eliminates calibration steps during production test, reducing manufacturing cycle time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVR | SOT-23-5 (DBV) package; identical electrical specs but different pinout (REF/ANODE/CATHODE on Pins 1/3/4 vs DCK's 2/3/1) | Requires PCB layout change due to non-pin-compatible footprint; used where higher thermal margin (RθJA = 206 °C/W) is needed | Select when board space allows DBV and thermal headroom exceeds 259 °C/W of DCK |
| TLVH431BQDBVR | Lower 1.24 V reference voltage; 0.5% tolerance; same Q-temp rating but 1.5 µA max Iref and 0.35 Ω impedance | Used in low-voltage systems (<5 V rails); unsuitable for 12 V+ feedback without level-shifting circuitry | Choose only for sub-3 V output regulation; not a functional drop-in replacement for TL431BIDCKT |
Compared with TL431BQDBVR and TLVH431BQDBVR, TL431BIDCKT offers the smallest footprint (SOT-23-3), highest thermal resistance (259 °C/W), and optimal 2.495 V reference for standard 5 V/12 V/24 V power rails - making it the preferred choice for space-constrained, high-temperature industrial designs.
Availability
TL431BIDCKT is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC supplies, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BIDCKT 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 ICs, with decades of expertise in precision reference and power control technologies.
The TL431 product line was engineered for high-accuracy, wide-temperature shunt regulation in safety-critical power conversion - targeting industrial motor drives, telecom infrastructure, and automotive subsystems.
FAQ
What is the reference voltage tolerance of TL431BIDCKT at 25°C?
The TL431BIDCKT has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal value with ±12 mV deviation. This B-grade accuracy is specified in TI's SLVS543S datasheet Section 6.11 and enables high-precision feedback without external trimming. The TL431BIDCKT maintains this tolerance across its full operating range when used within recommended conditions.
Does TL431BIDCKT support operation at 125°C?
Yes, TL431BIDCKT is rated for continuous operation from −40°C to +125°C (Q-grade), as confirmed in Section 4 (Device Comparison Table) and Section 6.13 of the TI datasheet. Its 14 mV max reference voltage drift over this range and 259 °C/W RθJA make it suitable for under-hood automotive and industrial inverter applications where ambient temperatures exceed 85°C.
What is the minimum cathode current required for regulation in TL431BIDCKT?
The TL431BIDCKT requires a minimum cathode current of 0.4 mA to maintain regulation, per Section 6.13 (Electrical Characteristics, TL431BQ). This low Imin enables reliable startup and stable operation even with high-value feedback resistors - critical for low-power standby modes in AC/DC adapters and energy-efficient industrial power supplies using TL431BIDCKT.
Can TL431BIDCKT replace a Zener diode in voltage regulation circuits?
Yes, TL431BIDCKT is explicitly designed as a superior Zener diode replacement, offering sharp turn-on characteristics, adjustable output (2.5 V to 36 V), and far better temperature stability. Unlike discrete Zeners, TL431BIDCKT delivers consistent 0.2 Ω dynamic impedance and 0.5% initial accuracy - making it ideal for precision feedback in switching regulators where TL431BIDCKT replaces 2.5 V–36 V Zener families.
What package type is used for TL431BIDCKT?
TL431BIDCKT uses the SOT-23-3 (DCK) package - a 2.90 mm × 1.30 mm surface-mount outline with gull-wing leads. This compact, thermally optimized package is documented in TI's SLVS543S datasheet Section 12 and supports automated assembly while delivering verified 259 °C/W junction-to-ambient thermal resistance for TL431BIDCKT.
TL431BIDCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- 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:
- SC-70-6
TL431BIDCKT FAQ
1.How can I place an order for TL431BIDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDCKT 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 TL431BIDCKT reliable?
The price and inventory of TL431BIDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDCKT is usually 5 days.
3.What payment methods are accepted for TL431BIDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDCKT?
TL431BIDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDCKT 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 TL431BIDCKT?
For technical support, including TL431BIDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDCKT requirements.
6.How does Aetrix verify that TL431BIDCKT is sourced from the original manufacturer or authorized distributors?
All TL431BIDCKT 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 TL431BIDCKT meets industry standards.
7.What is the process for return or replacement of TL431BIDCKT?
All TL431BIDCKT units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDCKT, 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 TL431BIDCKT part is unused and in its original packaging.
Return procedure for TL431BIDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDCKT Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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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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