LM431SCCMFX-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 (K) terminal of the shunt regulator. Sinks cathode current IKA of 1 mA to 100 mA (absolute max -100 to +150 mA) at up to 36 V relative to the anode. Dynamic impedance is 0.15 Ω typical.
2	REF	input	Reference input pin. Regulator drives cathode current to hold REF at the internal reference voltage Vref = 2.495 V (typ, 2.483-2.507 V). Reference input current IREF is 0.7 uA typical (4 uA max), input current range up to 10 mA absolute.
3	ANODE	passive	Anode (A) terminal. All voltages in the datasheet are referenced to the anode; typically tied to the low-side return of the regulated node.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LM431SCCMFX-TP

CAD (KiCad official)

Symbol: LM431SCCMFX-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
`lm431sccmfx-tp.step`	59 KB	You want the bare part, or you mark your own boards.
`lm431sccmfx-tp-etched.step`	1.9 MB	You want the part with `LM431SCCMFX-TP` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 490 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 (5 pp, sha256 c6711d64089b48c2, 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