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LM4040DIM3-4.1

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by Ray

Texas Instruments LM4040DIM3 4 1 NOPB Voltage Reference, SOT-23. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

markdown

LM4040DIM3-4.1

Texas Instruments · Voltage Reference · SOT-23

LM4040DIM3-4.1 from Texas Instruments, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Cathode passive Shunt cathode (+). Current-carrying / output-voltage node; sink shunt current here through an external series resistor from VDD to regulate to 4.096 V above anode.
2 Anode passive Shunt anode (-). Normally grounded reference return.
3 NC unconnected No internal connection. Must be left floating or tied to pin 2 (anode).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LM4040DIM3-4.1
  • LM4040DIM3-4.1LP
  • LM4040DIM3-4.1Z
  • LM4040DIM3-4.1DCK

The extractor listed these alongside LM4040DIM3-4.1, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LM4040DIM3-4.1M7

CAD (KiCad official)

  • Symbol: LM4040DIM3-4.1
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm4040dim3-4-1.step 59 KB You want the bare part, or you mark your own boards.
lm4040dim3-4-1-etched.step 1.9 MB You want the part with LM4040DIM3-4.1 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 502 faces against 69 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (71 pp, sha256 0b3a82f9510938cb, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF