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Texas Instruments TL431BIDCKTG4
- Part No.:
- TL431BIDCKTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TL431BIDCKTG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,199
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Product details
Overview
TL431BIDCKTG4 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 AC/DC power supplies.
For engineers reviewing the TL431BIDCKTG4 datasheet, TL431BIDCKTG4 pinout, TL431BIDCKTG4 application, or TL431BIDCKTG4 equivalent, key selection criteria include its Q-grade automotive temperature range, low output noise, sink-current capability up to 100 mA, and compatibility with standard resistor-divider feedback networks for output voltage programming from 2.5 V to 36 V.
Technical Context
The TL431BIDCKTG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when the divider ratio exceeds VREF, enabling precise closed-loop regulation without external op-amps.
It features sharp turn-on characteristics and stable operation across 1 mA–100 mA cathode current, with thermal stability validated for −40°C to 125°C (Q-grade). The SOT-23-3 (DCK) package supports high-density PCB layouts while maintaining 259°C/W junction-to-ambient thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV at 25°C - sets precise feedback threshold for output voltage programming |
| Initial Tolerance | ±0.5% (B grade) - enables tight output regulation without post-manufacturing trimming |
| Temp Range | −40°C to +125°C (Q grade) - qualified for under-hood automotive and industrial ambient conditions |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage perturbation under load transients |
| Cathode Current | 1 mA to 100 mA - supports direct drive of optocoupler LEDs or error amplifier inputs |
| Ref Input Current | 2–4 µA - allows use of high-value feedback resistors (>1 MΩ) to minimize power loss |
| Temp Drift (VI(dev)) | 14 mV max over full range - translates to <±0.056%/°C average coefficient for stable long-term accuracy |
Pinout & Package
SOT-23-3 (DCK) package: 2.90 mm × 1.30 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output | Connects to primary-side feedback node; sinks current to regulate output voltage |
| Pin 2 (REF) | Reference input | Senses voltage divider output; triggers conduction when ≥2.495 V relative to ANODE |
| Pin 3 (ANODE) | Common return | Typically tied to system ground or power supply return; defines reference potential for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.5 V to 36 V using two external resistors - eliminates need for multiple fixed references |
| Low output noise | Sub-20 µVPP (0.1–10 Hz), <260 nV/√Hz @ 1 kHz - preserves signal integrity in precision feedback loops |
| Sharp turn-on characteristic | Fast response with <1 µs pulse rise time - enables stable regulation in high-frequency switching supplies |
| High sink-current capability | 100 mA continuous cathode current - directly drives optocoupler LEDs without buffer transistors |
| Thermal stability | 14 mV max VREF deviation over −40°C to +125°C - maintains regulation accuracy in harsh environments |
Applications
| Rack Server Power | Industrial AC/DC Supply |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 48 V input, 12 V/50 A output telecom rectifier modules. IC Role / Device Role / Timing Role: Shunt reference providing feedback to optocoupler-driven PWM controller for output voltage regulation. Use Value: ±0.5% initial tolerance and 14 mV temp drift ensure <±1% total output variation across full operating temperature and line/load range. |
Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/20 A industrial power supply with wide input range (85–264 VAC). IC Role / Device Role / Timing Role: Precision reference in TL431-based feedback network controlling flyback converter duty cycle. Use Value: 0.2 Ω dynamic impedance minimizes output voltage droop during 10 A step-load transients, improving dynamic response. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection circuit in 3-phase 400 VAC input VFD with regenerative braking. IC Role / Device Role / Timing Role: Adjustable shunt reference setting trip threshold for comparator-based overvoltage shutdown logic. Use Value: Programmability from 2.5 V to 36 V allows single BOM part to support multiple bus voltage levels (e.g., 600 V, 750 V, 800 V DC). |
Use Scenario: Isolated feedback path in servo amplifier's auxiliary 15 V bias supply powering gate drivers and analog signal conditioning. IC Role / Device Role / Timing Role: Shunt reference stabilizing secondary-side LDO output used for op-amp and ADC reference rails. Use Value: Low 2–4 µA reference input current enables high-resistance feedback dividers, reducing standby power consumption by >30% vs. Zener alternatives. |
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; REF/ANODE/CATHODE pinout differs (Pin 1=REF, Pin 2=ANODE, Pin 3=CATHODE) | Requires PCB layout revision due to different pin assignment and 5-pin footprint | Select when higher thermal performance (206°C/W RθJA) or compatibility with existing DBV-based designs is required |
| TL431CZ | TO-92 package; C-grade (0°C to 70°C); ±2% initial tolerance; 6 mV temp drift | Limited to commercial-temperature consumer applications; not suitable for automotive or industrial ambient | Choose only for cost-sensitive, non-automotive applications where extended temperature range and tight tolerance are unnecessary |
Compared with TL431BIDCKTG4, TL431BQDBVR offers better thermal dissipation but demands board redesign, while TL431CZ sacrifices accuracy and temperature range for lower cost and through-hole assembly - neither is pin-compatible, making TL431BIDCKTG4 the optimal choice for space-constrained, high-reliability Q-grade designs.
Availability
TL431BIDCKTG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC supplies, and servo drive control modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TL431BIDCKTG4 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 designed for high-accuracy, low-drift voltage regulation in isolated power supplies and feedback systems - targeting automotive, industrial, and telecom applications demanding robustness and long-term stability.
FAQ
What is the reference voltage accuracy of TL431BIDCKTG4 at 25°C?
The TL431BIDCKTG4 has a reference voltage of 2.495 V with ±0.5% initial tolerance at 25°C, corresponding to a range of 2.483 V to 2.507 V per the B-grade specification in Section 6.11 of the datasheet. This tight tolerance enables high-precision output regulation without calibration.
Does TL431BIDCKTG4 support operation across the full automotive temperature range?
Yes, TL431BIDCKTG4 is a Q-grade device rated for −40°C to +125°C operating free-air temperature, fully qualified for under-hood automotive applications. Its 14 mV maximum reference voltage deviation over this range confirms thermal stability per TI's SLVS543S specification.
What is the cathode current capability of TL431BIDCKTG4?
TL431BIDCKTG4 supports continuous cathode current from 1 mA to 100 mA, with minimum regulation current of 0.4–0.7 mA depending on temperature. This range allows direct driving of optocoupler LEDs in feedback circuits without external amplification.
How does the SOT-23-3 (DCK) package affect thermal performance of TL431BIDCKTG4?
The DCK package has a junction-to-ambient thermal resistance (RθJA) of 259°C/W, limiting power dissipation in still-air conditions. For 100 mA cathode current at 36 V differential, derating is required; thermal design must account for PCB copper area and airflow to maintain TJ < 150°C.
Can TL431BIDCKTG4 replace a Zener diode in feedback networks?
Yes, TL431BIDCKTG4 is explicitly designed as a superior Zener replacement, offering sharper turn-on, lower dynamic impedance (0.2 Ω vs. typical 5–20 Ω for Zeners), and programmable output from 2.5 V to 36 V - all while maintaining stable regulation across temperature and current.
TL431BIDCKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
TL431BIDCKTG4 FAQ
1.How can I place an order for TL431BIDCKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDCKTG4 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 TL431BIDCKTG4 reliable?
The price and inventory of TL431BIDCKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDCKTG4 is usually 5 days.
3.What payment methods are accepted for TL431BIDCKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDCKTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDCKTG4?
TL431BIDCKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDCKTG4 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 TL431BIDCKTG4?
For technical support, including TL431BIDCKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDCKTG4 requirements.
6.How does Aetrix verify that TL431BIDCKTG4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDCKTG4 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 TL431BIDCKTG4 meets industry standards.
7.What is the process for return or replacement of TL431BIDCKTG4?
All TL431BIDCKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDCKTG4, 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 TL431BIDCKTG4 part is unused and in its original packaging.
Return procedure for TL431BIDCKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDCKTG4 Tags
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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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