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Texas Instruments TL431BIDCKTE4
- Part No.:
- TL431BIDCKTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TL431BIDCKTE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,380
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Product details
Overview
TL431BIDCKTE4 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, 0.2 Ω typical dynamic impedance, and operation across −40°C to 125°C. It serves as a high-stability replacement for Zener diodes in feedback loops of isolated DC/DC converters, AC/DC power supplies, and servo drive control modules.
For engineers reviewing the TL431BIDCKTE4 datasheet, TL431BIDCKTE4 pinout, TL431BIDCKTE4 application, or TL431BIDCKTE4 equivalent, key selection criteria include its Q-temp grade temperature range, B-grade accuracy, low output noise, sharp turn-on characteristic, and compatibility with standard resistor-divider programming for adjustable outputs from 2.5 V to 36 V.
Technical Context
The TL431BIDCKTE4 implements an internal bandgap reference, error amplifier, and NPN output stage configured as a three-terminal adjustable shunt regulator. Its REF–ANODE–CATHODE topology enables precise voltage sensing at the REF pin relative to ANODE, with cathode current sinking up to 100 mA while maintaining regulation.
Designed for automotive-qualified applications, the Q-temp grade (−40°C to 125°C) ensures stable performance under thermal stress, with confirmed 14 mV max reference voltage drift over full temperature range and <1 µA reference input current - critical for high-impedance feedback networks in energy-efficient power designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (nominal), ±0.5% initial tolerance at 25°C - enables tight-setpoint regulation without calibration. |
| Temperature Range | −40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments. |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage variation under load transients in closed-loop feedback paths. |
| Cathode Current Range | 1 mA to 100 mA - supports wide-range sink capability for diverse biasing and regulation topologies. |
| Reference Input Current | 2–4 µA - allows use with high-value resistor dividers (>1 MΩ) to reduce power loss in battery-powered systems. |
| Output Noise | Low broadband noise (typ. 20 nV/√Hz @ 1 kHz) - preserves signal integrity in precision analog feedback circuits. |
| Max Cathode Voltage | 36 V - accommodates wide-input industrial and telecom power supply rails. |
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 regulated rail or optocoupler LED anode; sinks current to maintain reference condition at REF. |
| REF (Pin 2) | High-impedance reference threshold input | Senses voltage divider output; triggers regulation when voltage reaches 2.495 V relative to ANODE. |
| ANODE (Pin 3) | Common return/reference ground | Typically tied to system ground or power supply return; defines reference potential for REF pin. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial accuracy (B grade) | Reduces need for post-production trimming in cost-sensitive power supply manufacturing. |
| Q-temp qualification (−40°C to 125°C) | Validated for automotive engine control units and industrial inverters requiring extended thermal reliability. |
| 0.2 Ω dynamic impedance | Enables stable regulation even with fast load steps in switching power supply feedback loops. |
| Adjustable output (2.5 V to 36 V) | Programmable via two external resistors - eliminates need for multiple fixed-voltage references. |
| Low 2–4 µA reference current | Permits high-resistance feedback networks, minimizing standby power in always-on systems. |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in isolated 48 V input server PSUs using optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference setting feedback threshold for TL431BIDCKTE4-driven optocoupler LED current. Use Value: Maintains ±1% output voltage accuracy across line/load/temperature, meeting ATX and OCP specifications. |
Use Scenario: Output voltage sensing and regulation in 3 kW industrial AC/DC front-end supplies. IC Role / Device Role / Timing Role: TL431BIDCKTE4 provides stable reference for PWM controller error amplifier in flyback or forward topology. Use Value: 14 mV max Vref drift over −40°C to 125°C ensures consistent regulation during thermal cycling in factory automation equipment. |
| AC Inverter Drive | Servo Drive Control Module |
|
Use Scenario: DC bus voltage monitoring and overvoltage protection circuitry in variable-frequency drives. IC Role / Device Role / Timing Role: TL431BIDCKTE4 acts as comparator reference in crowbar or shutdown logic triggered by bus voltage thresholds. Use Value: Sharp turn-on characteristic ensures fast, repeatable trip points - critical for IGBT gate driver safety interlocks. |
Use Scenario: Feedback reference for dual-loop (current/voltage) control in high-bandwidth servo amplifiers. IC Role / Device Role / Timing Role: TL431BIDCKTE4 sets precise gain and offset in analog signal conditioning path before ADC sampling. Use Value: Low 0.2 Ω output impedance prevents loading errors in high-gain op-amp stages, preserving position resolution. |
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 package; REF/ANODE/CATHODE pins rearranged vs. DCK's DBZ pinout; identical electrical specs. | Requires PCB layout revision due to different pin assignment; not drop-in compatible. | Select when board space allows SOT-23-5 or when alternate pinout simplifies routing near optocouplers. |
| TLVH431BQDBVR | Lower 1.24 V reference voltage; 1.5% initial tolerance; same Q-temp rating and SOT-23-5 package. | Used where lower reference voltage enables direct sensing of sub-2.5 V rails (e.g., 1.8 V FPGA cores). | Choose only if system requires <2.5 V reference; not interchangeable with TL431BIDCKTE4 in existing 2.5 V+ designs. |
Compared with TL431BQDBVR and TLVH431BQDBVR, TL431BIDCKTE4 offers the industry-standard SOT-23-3 footprint with optimal pinout for optocoupler-coupled feedback, tighter 0.5% tolerance, and 2.495 V reference - making it preferred for legacy-compatible, high-accuracy isolated power designs.
Availability
TL431BIDCKTE4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BIDCKTE4 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 delivers programmable shunt references optimized for feedback stability, accuracy, and thermal robustness in isolated power conversion - targeting automotive, industrial, and computing power systems.
FAQ
What is the reference voltage tolerance of TL431BIDCKTE4 at 25°C?
The TL431BIDCKTE4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal 2.495 V output with min/max bounds of 2.483 V and 2.507 V. This B-grade accuracy is specified per TI's SLVS543S datasheet Section 6.11 and enables high-precision regulation without external trimming in TL431BIDCKTE4-based feedback networks.
What temperature range is TL431BIDCKTE4 rated for?
TL431BIDCKTE4 is rated for operation from −40°C to +125°C (Q-temp grade), validated across this full range with ≤14 mV reference voltage deviation. Its thermal stability makes TL431BIDCKTE4 suitable for under-hood automotive modules, industrial motor drives, and telecom rectifiers exposed to extreme ambient conditions.
What package type does TL431BIDCKTE4 use?
TL431BIDCKTE4 uses the SOT-23-3 (DBZ) package, measuring 2.90 mm × 1.30 mm, with pin 1 = CATHODE, pin 2 = REF, and pin 3 = ANODE. This compact, surface-mount outline is widely adopted in space-constrained power supply designs and is distinct from SOT-23-5 or SOIC variants of the TL431 family.
How much cathode current can TL431BIDCKTE4 sink?
TL431BIDCKTE4 supports continuous cathode current from 1 mA to 100 mA while maintaining regulation. Its 0.2 Ω dynamic impedance ensures minimal voltage shift across this range, enabling reliable operation in TL431BIDCKTE4-based shunt regulators driving optocoupler LEDs or discrete transistor bases in feedback circuits.
Is TL431BIDCKTE4 pin-compatible with other TL431 variants?
No - TL431BIDCKTE4 (SOT-23-3, DBZ) has a different pinout than TL431BQDBVR (SOT-23-5) or SOIC-packaged TL431s. The DBZ pin assignment (CATHODE–REF–ANODE) is unique to the 3-pin variant; substituting packages requires PCB layout changes. Always verify pin mapping before replacement in TL431BIDCKTE4 designs.
TL431BIDCKTE4 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
TL431BIDCKTE4 FAQ
1.How can I place an order for TL431BIDCKTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDCKTE4 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 TL431BIDCKTE4 reliable?
The price and inventory of TL431BIDCKTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDCKTE4 is usually 5 days.
3.What payment methods are accepted for TL431BIDCKTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDCKTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDCKTE4?
TL431BIDCKTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDCKTE4 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 TL431BIDCKTE4?
For technical support, including TL431BIDCKTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDCKTE4 requirements.
6.How does Aetrix verify that TL431BIDCKTE4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDCKTE4 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 TL431BIDCKTE4 meets industry standards.
7.What is the process for return or replacement of TL431BIDCKTE4?
All TL431BIDCKTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDCKTE4, 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 TL431BIDCKTE4 part is unused and in its original packaging.
Return procedure for TL431BIDCKTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDCKTE4 Tags
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TL431AIDBZR
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TL431BQDBZR
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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
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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