LD1117-3.3 from UMW, in a SOT-223. Pinout and pin descriptions extracted from the datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Ground reference for the fixed-output LD1117-3.3 variant. On the shared die this pin is the ADJ/GND pad (adjustable variants use it as the ADJ feedback node); for the fixed 3.3V part it must be tied to system ground.
2	VOUT	power_out	Regulated 3.3V output (3.234V min / 3.300V typ / 3.366V max at Iout=10mA, Vin=5V, Tj=25°C). Delivers up to 1A. Requires an output capacitor for stability; a 22µF tantalum is recommended.
3	VIN	power_in	Unregulated input supply. Recommended operating range up to 12V, absolute maximum 18V. Typical dropout is 1.2V at 1A load. A 10µF input capacitor is recommended.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOT-223
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

LD1117-3.3
LD1117-3.3CD-3.3
LD1117-3.3S-3.3

CAD (KiCad official)

Symbol: LD1117-3.3
Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
3D model: SOT-223 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ld1117-3-3.step`	64 KB	You want the bare part, or you mark your own boards.
`ld1117-3-3-etched.step`	1.3 MB	You want the part with `LD1117-3.3` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 350 faces against 75 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: UMW datasheet (14 pp, sha256 b65a8249b6e9e313, 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