AMS1117-1.8 from UMW, in a SOT-223. 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	GND	power_in	Ground reference for the regulator. On the fixed-output AMS1117-1.8 variant this pin is tied to system ground (on the AMS1117-ADJ variant the same physical pin is the ADJ feedback input).
2	VOUT	power_out	Regulated 1.8V output (typ 1.800V, min 1.764V, max 1.836V at Iout=10mA, Vin=3.8V, Tj=25C). Rated for up to 1A load current. Requires a 22uF tantalum output capacitor for stability.
3	VIN	power_in	Unregulated input supply. Absolute maximum 18V, recommended operating 12V max. For 1.8V output, minimum Vin is approximately Vout + dropout (~1.2V @ 1A). A 10uF input bypass capacitor is recommended.

Key specifications

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

Ordering variants

AMS1117-1.8
AMS1117-1.8CD-1.8
AMS1117-1.8S-1.8

CAD (KiCad official)

Symbol: AMS1117-1.8
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
`ams1117-1-8.step`	64 KB	You want the bare part, or you mark your own boards.
`ams1117-1-8-etched.step`	1.5 MB	You want the part with `AMS1117-1.8` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 389 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 (13 pp, sha256 5ec219092aa45bd9, 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