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Texas Instruments LM4040D25IDBZTG4 — Analog & Data Acquisition

LM4040D25IDBZTG4 Shunt Voltage Reference, 2.5 V Fixed, ±1%

MPNLM4040D25IDBZTG4
End of Life

Texas Instruments LM4040D25IDBZTG4, precision shunt voltage reference, 2.5 V fixed output, ±1% tolerance, 15 mA output, 80 µA cathode current, SOT-23-3 package, -40°C to 85°C.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040D25IDBZTG4 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.5V
Output current15 mA
Current - cathode80 µA
Operating temperature-40°C~85°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 fixed shunt reference in SOT-23-3

It is a three-terminal shunt (two-terminal plus cathode) device — the load and a bias resistor sit in series with the cathode, and the reference regulates by shunting current to ground. The SOT-23-3 package and surface-mount footprint make it a direct fit for compact PCBs in industrial control, sensor interfaces, and power-supply monitoring where a stable voltage rail is needed without a dedicated reference IC.

15 mA output, 80 µA cathode — sizing the bias resistor

The shunt can sink up to 15 mA continuous, which sets the ceiling for how much load current plus the reference's own quiescent draw the external resistor must supply. The minimum cathode current is 80 µA — if the total current through the reference drops below that, regulation is lost. For a typical 5 V rail feeding the reference through a resistor, the resistor value is chosen so that (Vin - 2.5 V) / R stays between 80 µA and 15 mA across all load and temperature conditions.

It is a standard catalog part from TI's LM4040 family, in continuous production.

Frequently asked questions

Is LM4040D25IDBZTG4 RoHS compliant?

The part is listed with a Tape & Reel package and is a standard TI catalog device; RoHS compliance is typical for this family, but verify against the specific date code lot certificate at order time.

What is the closest pin-compatible alternative to LM4040D25IDBZTG4?

The LM4040A25 is a higher-grade sibling in the same family with tighter tolerance (typically ±0.1%) and the same SOT-23-3 footprint. It is a direct drop-in if the design needs better initial accuracy, though the A-grade part may carry a price premium.