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Texas Instruments TL431BQDBVTE4 — Analog & Data Acquisition

TL431BQDBVTE4 Shunt Reference, ±0.5% Tolerance, SOT-23-5

MPNTL431BQDBVTE4
End of Life

Texas Instruments TL431BQDBVTE4, adjustable shunt voltage reference, ±0.5% tolerance, 100 mA output, 2.495 V reference, SOT-23-5 package, -40°C to 125°C.

$1.2300Ref. price · indicative, final on quote
Texas Instruments TL431BQDBVTE4 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

TL431BQDBVTE4 specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Reference typeShunt
Voltage - output36 V
Voltage - output (Min (Fixed))2.495V
Output current100 mA
Current - cathode700 µA
Operating temperature-40°C~125°C(TA)
PackageTape & Reel (TR)
Tolerance±0.5%
CaseSC-74A, SOT-753

Product details

Precision shunt reference for the BOM line

What sets this 'BQ' grade apart is the ±0.5% tolerance on the internal reference, tighter than the standard TL431's 1% or 2% grades. That half-percent window matters when the output rail or ADC reference needs to hold its value across temperature and load without a trim pot.

The 100 mA output current rating is the maximum cathode current the device can sink while maintaining regulation. In practice, the shunt current is set by the bias resistor from the supply — pick a resistor that keeps the cathode current above the 700 µA minimum (the quiescent floor) and below 100 mA at the worst-case supply voltage. Below 700 µA the reference loses regulation; above 100 mA you risk thermal runaway in the SOT-23-5 package. The ±0.5% tolerance is specified at 25°C; expect some additional drift over the full temperature range, but the BQ grade keeps the window tighter than the standard part.

Frequently asked questions

Is TL431BQDBVTE4 compatible with the standard TL431?

Yes — it is pin-compatible and functionally identical to the base TL431. The difference is the tighter ±0.5% reference tolerance versus the standard ±1% or ±2% grades. In a circuit that already uses a TL431, the BQDBVTE4 drops in and gives a more precise output without any board change.

What is the accuracy of TL431BQDBVTE4?

The reference voltage tolerance is ±0.5% at 25°C. This is the 'BQ' grade — tighter than the standard TL431's ±1% or ±2% options. For a 2.5 V reference, that means the output stays within ±12.5 mV of the nominal value at room temperature, before temperature drift.