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Texas Instruments LM4040DIM3X-2.5 — Analog & Data Acquisition

LM4040DIM3X-2.5 Shunt Voltage Reference, 2.5V ±1%, SOT-23-3

MPNLM4040DIM3X-2.5
Last Buy

Texas Instruments LM4040DIM3X-2.5 precision micropower shunt voltage reference, fixed 2.5 V output, ±1% tolerance, SOT-23-3 surface mount package, -40°C to 85°C operation.

$1.0600Ref. price · indicative, final on quote
Texas Instruments LM4040DIM3X-2.5 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM4040DIM3X-2.5 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Reference typeShunt
Voltage - output (Min (Fixed))2.5V
Output current15 mA
Current - cathode70 µA
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR) Cut Tape (CT)
Tolerance±1%
CaseTO-236-3, SC-59, SOT-23-3
Noise - 10Hz to 10kHz35µVrms
Temperature coefficient150ppm/°C

Product details

2.5 V shunt reference — precision and noise floor

The Texas Instruments LM4040DIM3X-2.5 is a micropower shunt voltage reference delivering a fixed 2.5 V output with ±1% initial tolerance.

Cathode current, output drive, and temperature drift

Minimum cathode current is 70 µA — the shunt must see at least this much current through the bias resistor to maintain regulation. Maximum output current is 15 mA, which sets the upper bound on the load the reference can drive directly. Temperature coefficient is 150 ppm/°C.

This means the part is at end-of-life — final production orders are being accepted, but no further manufacturing runs are planned after the LTB window closes. For a BOM line still specifying this exact order code, the immediate action is to secure lifetime buy quantities for forecasted production needs, or qualify a pin-compatible alternative.

Frequently asked questions

Is LM4040DIM3X-2.5 obsolete?

The manufacturer lists the LM4040DIM3X-2.5 as Last Buy, meaning the part is in its final production phase and approaching obsolescence. It is not yet fully discontinued, but the LTB window is active — plan for a replacement or secure lifetime buy quantities soon.

What is the difference between LM4040DIM3-2.5 and LM4040DIM3X-2.5?

The LM4040DIM3-2.5 and LM4040DIM3X-2.5 share the same electrical specifications — both are 2.5 V shunt references with ±1% tolerance in SOT-23-3 packages. The difference is in the tape-and-reel packaging suffix: the 'X' variant denotes a specific reel orientation or quantity. They are functionally identical and can be substituted in the same PCB footprint, but verify the reel packaging matches your assembly house requirements.

Can I use LM4040AIM3-2.5 instead of LM4040DIM3X-2.5?

Yes — the LM4040AIM3-2.5 is pin-compatible and shares the same 2.5 V output and SOT-23-3 package. The key difference is tighter tolerance: the AIM3 grade offers ±0.1% versus the DIM3X's ±1%. Electrically it is a drop-in replacement that improves reference accuracy, though the tighter tolerance typically carries a higher unit cost.