LM4040C25FTA-TP from TECH PUBLIC, 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 (+) of the shunt voltage reference. Connect through a series resistor RS to the supply so that reverse current stays between IRMIN (45 µA typ, 65 µA max) and 15 mA. Regulates to VR = 2.5 V (±0.5%) with respect to ANODE.
2	ANODE	passive	Anode (−) of the shunt voltage reference. Normally tied to circuit ground; the 2.5 V reference voltage appears between CATHODE and this pin.
3	NC	passive	No internal connection to the reference circuit; pin is attached to the die substrate. Must be either left open or connected to ANODE - do not tie to CATHODE or to any other node.

Key specifications

Parameter	Value
Manufacturer	TECH PUBLIC
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

LM4040C25FTA-TP

CAD (KiCad official)

Symbol: LM4040C25FTA-TP
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
`lm4040c25fta-tp.step`	59 KB	You want the bare part, or you mark your own boards.
`lm4040c25fta-tp-etched.step`	2.1 MB	You want the part with `LM4040C25FTA-TP` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 529 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: TECH PUBLIC datasheet (6 pp, sha256 86174a00f4146ef3, retrieved 2026-08-17, tier: lcsc)
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