TL431BCDCKTE4 Texas Instruments Integrated Circuit (SOT23 (6-Pin)) In Stock
The TL431BCDCKTE4 is a precision adjustable shunt voltage reference from Texas Instruments in the TL431 series, with an output range of 2.495 V to 36 V and 100 mA maximum output current. It features high accuracy in a compact 6-pin SC-70 package for space-critical PCB designs. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (6-Pin)
- Pin Count
- 6
- Lifecycle
- OBSOLETE
- Datasheet
- TL431BCDCKTE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Adjustable output voltage from 2.495 V to 36 V using just 2 external resistors, eliminating the need for a dedicated fixed-voltage reference IC
- Precision 2.495 V internal reference voltage with tight initial accuracy in the TL431B grade, providing better tolerance than standard TL431 for high-accuracy supply monitoring
- 100 mA maximum output sink current enabling use as a shunt regulator or error amplifier in switching power supply feedback loops
- Ultra-compact 6-pin SC-70 package (SOT-23-6) with footprint under 5 mm², ideal for space-constrained power supply designs and portable electronics
Applications
The TL431BCDCKTE4 is widely used as a precision voltage reference and feedback error amplifier in switch-mode power supplies, where it sets the output voltage regulation point via optocoupler feedback in flyback and buck converter topologies. It also serves as a precision voltage monitor and comparator in battery management circuits, detecting overvoltage or undervoltage conditions on rails from 2.495 V to 36 V. The compact SC-70-6 package makes it suitable for USB power delivery modules, chargers, and any portable design where board area is limited to under 10 mm² per voltage regulation function.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | OUTPUT VOLTAGE ADJUSTABLE FROM 2.495V TO 36V |
| Analog IC - Other Type | TWO TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | R-PDSO-G6 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.1A |
| Output Voltage-Max | 2.507V |
| Output Voltage-Min | 2.483V |
| Output Voltage-Nom | 2.495V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP6,.08 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temp Coef of Voltage-Max | 92ppm/°C |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trim/Adjustable Output | YES |
| ## TL431BCDCKTE4 Alternates Showing results | Image |
| Package | SOT23 (6-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TL431BCDCKTE4:
Frequently Asked Questions
What output voltage range does TL431BCDCKTE4 support, and how is it set?
The TL431BCDCKTE4 supports an adjustable output voltage from 2.495 V up to 36 V, set by a resistor divider connected between the output and the REF pin. With only 2 external resistors, designers can program any desired reference voltage within this range, making it far more versatile than a fixed-voltage shunt reference for multi-rail power supply designs.
How does the TL431B grade accuracy differ from standard TL431 in precision supply feedback applications?
The TL431B grade specifies a tighter initial reference voltage tolerance of ±0.5% at 25°C compared to the standard TL431 grade tolerance of ±2%. In a 5 V regulated power supply using a resistor divider, this means TL431BCDCKTE4 holds the output within ±25 mV versus ±100 mV for the standard grade, a critical improvement for precision ADC reference supplies and battery cutoff circuits.
Can TL431BCDCKTE4 be used as an error amplifier in an optocoupler-feedback flyback power supply?
Yes, the TL431BCDCKTE4 is the standard choice as an error amplifier in isolated flyback supplies. Its REF pin acts as the inverting input of an internal amplifier with 100 mA cathode sink capability, driving an optocoupler LED directly. The 2.495 V reference sets a precise feedback threshold, and the SC-70-6 package fits within the tight layout constraints of a compact 5 W to 30 W USB or AC-DC adapter PCB.
What are the advantages of the 6-pin SC-70 package over SOT-23 for TL431BCDCKTE4 in dense PCB designs?
The 6-pin SC-70 package of TL431BCDCKTE4 measures approximately 2 mm x 1.25 mm, roughly 40% smaller in footprint than a SOT-23-5 package at 2.9 mm x 1.6 mm. This size reduction is significant in multi-channel voltage monitoring boards where 4 to 8 reference instances must fit within a 1 cm² area, such as in power management ICs or server power distribution units.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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