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LM4040BIM3-2.5

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Texas Instruments LM4040BIM3 2 5 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

LM4040BIM3-2.5

Texas Instruments · Voltage Reference · SOT-23

LM4040BIM3-2.5 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 / shunt current input / output voltage node. Sinks reverse current (60 µA to 15 mA) through a series resistor RS from VDD to regulate at the fixed 2.5 V reference voltage.
2 Anode passive Anode pin, normally grounded. Return path for the shunt reference current.
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.

  • LM4040BIM3-2.5
  • LM4040BIM3-2.5IZ
  • LM4040BIM3-2.5BIZ

The extractor listed these alongside LM4040BIM3-2.5, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • LM4040BIM3-2.5IM7
  • LM4040BIM3-2.5BIM7

CAD (KiCad official)

  • Symbol: LM4040BIM3-2.5
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: lm4040bim3-2-5-etched.step / lm4040bim3-2-5-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm4040bim3-2-5.step / lm4040bim3-2-5.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm4040bim3-2-5.step 59 KB You want the bare part, or you mark your own boards.
lm4040bim3-2-5-etched.step 2.2 MB You want the part with LM4040BIM3-2.5 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 549 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 e900a1db78eb4fc3, 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