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Texas Instruments LM4040D25QDBZTG4 — Analog & Data Acquisition

TI LM4040D25QDBZTG4 Shunt Voltage Reference, 2.5 V ±1%

MPNLM4040D25QDBZTG4
End of Life

Texas Instruments LM4040D25QDBZTG4, precision shunt voltage reference, fixed 2.5 V output, ±1% tolerance, 80 µA cathode current, 15 mA output, SOT-23-3, -40°C to 125°C, Tape & Reel.

$0.5300Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040D25QDBZTG4 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.5V
Output current15 mA
Current - cathode80 µA
Operating temperature-40°C~125°C(TA)
PackageTape & Reel (TR)
Tolerance±1%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz35µVrms
Temperature coefficient150ppm/°C

Product details

2.5 V shunt reference in a SOT-23-3 package

It operates as a two-terminal shunt (like a Zener), requiring only a cathode resistor from the supply rail — no external bypass capacitor needed for stability. The 80 µA cathode current floor lets it run from a low-power bias, while the 15 mA output capability can source enough current to bias multiple ADC inputs or a comparator threshold divider.

Temperature drift and noise floor

The 35 µVrms noise (10 Hz to 10 kHz) is low enough that it won't dominate the ADC's SNR in most industrial signal chains; if your application needs sub-10 µV noise, step up to the LM4040A25 (higher grade, lower drift).

Frequently asked questions

What is the best replacement for LM4040D25QDBZTG4 if it is out of stock?

The closest pin-compatible alternative within the same family is the LM4040A25 (higher precision grade, ±0.1% tolerance) or the LM4040C25 (±0.5%). Both share the same SOT-23-3 footprint and 2.5 V output. For a different topology, the TL431 is an adjustable shunt reference with a 2.5 V internal reference, but its output is not fixed — it requires an external resistor divider, and its noise and drift specs are wider than the LM4040D25's.

How does LM4040D25QDBZTG4 compare to the TL431 in terms of accuracy and noise?

The LM4040D25 has a fixed 2.5 V output with ±1% tolerance and 35 µVrms noise (10 Hz to 10 kHz). The TL431 is an adjustable shunt with a 2.5 V internal reference, but its typical tolerance is ±1% at best and its noise is not specified in the same bandwidth — the TL431's output noise is typically higher and depends on the external resistor network. For a clean, fixed 2.5 V rail, the LM4040D25 is the simpler, lower-noise choice.