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LM4040AIM3X-2.5

Public Unreviewed

by Ray

Texas Instruments LM4040AIM3X 2 5 NOPB Voltage Reference, SOT-23. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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LM4040AIM3X-2.5

Texas Instruments · Voltage Reference · SOT-23

LM4040AIM3X-2.5 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 Cathode / VOUT of the shunt reference. Connect through a series bias resistor R_S from V_DD; the pin regulates to 2.5 V (±0.1% A-grade) with respect to Anode across 60 μA-15 mA of reverse current. Stable for any capacitive load; forward current absolute maximum 10 mA, reverse current absolute maximum 20 mA.
2 Anode passive Anode of the shunt reference, normally grounded. Provides the low-side return for the reverse breakdown current supplied to the Cathode pin.
3 NC unconnected No connect. Must be left floating or connected to pin 2 (Anode); do not tie to Cathode or any other net.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LM4040AIM3X-2.5
  • LM4040AIM3X-2.5IZ
  • LM4040AIM3X-2.5AIZ
  • LM4040AIM3X-2.5BIZ
  • LM4040AIM3X-2.5CIZ
  • LM4040AIM3X-2.5DIZ

The extractor listed these alongside LM4040AIM3X-2.5, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LM4040AIM3X-2.5BIM3
  • LM4040AIM3X-2.5BIM3X
  • LM4040AIM3X-2.5CIM3
  • LM4040AIM3X-2.5CIM3X
  • LM4040AIM3X-2.5DIM3
  • LM4040AIM3X-2.5DIM3X
  • LM4040AIM3X-2.5IM7
  • LM4040AIM3X-2.5IM7X
  • LM4040AIM3X-2.5AIM7
  • LM4040AIM3X-2.5AIM7X
  • LM4040AIM3X-2.5BIM7
  • LM4040AIM3X-2.5BIM7X
  • LM4040AIM3X-2.5CIM7
  • LM4040AIM3X-2.5CIM7X
  • LM4040AIM3X-2.5DIM7
  • LM4040AIM3X-2.5DIM7X

CAD (KiCad official)

  • Symbol: LM4040AIM3X-2.5
  • 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
lm4040aim3x-2-5.step 59 KB You want the bare part, or you mark your own boards.
lm4040aim3x-2-5-etched.step 2.1 MB You want the part with LM4040AIM3X-2.5 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 547 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 3408d7abb0a21a15, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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