Skip to main content
Log in
Texas Instruments TLV431QPK — Analog & Data Acquisition

TLV431QPK Adjustable Shunt Reference, 1.24 V, ±1.5%, Active

MPNTLV431QPK
Active

Texas Instruments TLV431QPK adjustable shunt voltage reference, 1.24 V minimum, ±1.5% tolerance, 15 mA output, SOT-89-3 surface-mount package, -40°C to 125°C operating temperature.

$0.2890Ref. price · indicative, final on quote
Texas Instruments TLV431QPK datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TLV431QPK 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±1.5%
CaseTO-243AA

Product details

1.24 V minimum, adjustable to 6 V — the precision shunt reference for tight regulation

Its ±1.5% tolerance is tighter than the industry-standard TL431's typical ±2%, making it the choice for applications where output accuracy matters — precision power supplies, data-acquisition front ends, and sensor bias circuits.

The 15 mA output current rating sets the upper limit for the load the reference can drive directly; for higher loads, buffer with an op-amp or transistor. The 100 µA minimum cathode current is the bias current the device needs to regulate — below that, the output voltage drifts. Design the bias resistor to guarantee at least 100 µA through the cathode at all input voltages.

SOT-89-3 package — surface-mount with a thermal tab

Housed in a TO-243AA (SOT-89-3) surface-mount package, the TLV431QPK has a large collector tab on the bottom that conducts heat to the PCB copper plane. The tab is internally connected to the cathode terminal.

Frequently asked questions

Is TLV431QPK a good replacement for TL431 or other adjustable shunt references?

The TLV431QPK is pin-compatible with the industry-standard TL431 in the SOT-89-3 package, but offers a tighter ±1.5% tolerance versus the TL431's typical ±2%. It also operates down to 1.24 V minimum output, compared to the TL431's 2.5 V minimum. For designs requiring a lower reference voltage or tighter regulation, the TLV431QPK is a direct drop-in replacement.