Skip to main content
Log in
Texas Instruments TLV431BQPK — Analog & Data Acquisition

TLV431BQPK Shunt Voltage Reference, ±0.5% Tolerance

MPNTLV431BQPK
End of Life

Texas Instruments TLV431BQPK adjustable shunt voltage reference, ±0.5% tolerance, 1.24 V to 6 V output, 15 mA output, 100 µA cathode current, SOT-89-3 package, -40°C to 125°C.

$0.7700Ref. price · indicative, final on quote
Texas Instruments TLV431BQPK datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TLV431BQPK specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output6 V
Voltage - output (Min (Fixed))1.24V
Output current15 mA
Current - cathode100 µA
Operating temperature-40°C ~ 125°C (TA)
PackageTape & Reel (TR) Cut Tape (CT)
Tolerance±0.5%
ManufacturerTexas Instruments
CaseTO-243AA

Product details

Shunt reference with ±0.5% tolerance

It delivers a regulated output from 1.24 V up to 6 V, set by two external resistors. The ±0.5% tolerance is the headline spec — it holds the reference voltage tighter than the standard TL431's 1% grade, which matters when the ADC reference or comparator threshold has no post-trim.

Output drive and cathode current floor

Rated for 15 mA continuous output current and a minimum cathode current of 100 µA. The 100 µA floor means the device always draws enough bias to stay in regulation — below that the output drifts. In practice, size the bias resistor so the cathode current stays above 100 µA across the full load range, including the no-load condition.

The SOT-89-3 package (TO-243AA) has a large collector tab that conducts heat to the PCB copper — the thermal resistance depends on the pad area under the tab, not just the air flow.

Frequently asked questions

What is the tolerance of TLV431BQPK?

The TLV431BQPK is specified with ±0.5% tolerance on the reference voltage. This is tighter than the standard TL431's 1% grade and suits precision bias or ADC reference applications.

Can TLV431BQPK replace TL431?

The TLV431BQPK is pin-compatible with the standard TL431 in the same SOT-89-3 footprint and shares the same adjustable shunt reference function. The key difference is the ±0.5% tolerance versus the TL431's typical 1% grade, so it can drop in where tighter output accuracy is needed.