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Texas Instruments TL431QPKG3 — Analog & Data Acquisition

TL431QPKG3 Shunt Reference, ±2.2% Tolerance, SOT-89-3

MPNTL431QPKG3
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Texas Instruments TL431QPKG3 adjustable shunt voltage reference, ±2.2% tolerance, 100 mA output, 2.495 V reference, -40 to 125 °C, SOT-89-3 package.

$0.4600Ref. price · indicative, final on quote
Texas Instruments TL431QPKG3 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TL431QPKG3 specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode1 mA
Operating temperature-40°C~125°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±2.2%
CaseTO-243AA

Product details

Adjustable shunt reference, ±2.2% — tight enough for most feedback loops

Its 2.495 V minimum output is the internal bandgap; the output can be set anywhere from that up to 36 V with two external resistors. The ±2.2% tolerance is tighter than the standard ±2% or ±1% grades, making it suitable for designs that need better than 2% initial accuracy without moving to a 0.5% part.

100 mA output — thermal limit in SOT-89-3

The device can sink 100 mA continuously, but in the SOT-89-3 package the thermal impedance limits practical dissipation. The 1 mA minimum cathode current means the reference always draws at least 1 mA to maintain regulation. That sets a floor on the bias resistor in a shunt configuration; the resistor must supply 1 mA plus the load current.

Frequently asked questions

What is the difference between TL431QPKG3 and TL431QDBZR?

Both are adjustable shunt references from the same TL431 family. The QPKG3 variant is in a SOT-89-3 package (TO-243AA), while the QDBZR is in a smaller SOT-23-3 package. The SOT-89-3 offers better thermal dissipation for higher continuous current. The tolerance and temperature range are the same for both.