AMS1117-1.8V from MSKSEMI AMS1117 1 8V, 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 / common return pin. On the fixed 1.8V version (AMS1117-1.8V), pin 1 (labeled VSS/ADJ in the pinout table) functions as the device ground reference. Connect to system single-point ground.
2	VOUT	power_out	Regulated 1.8V output pin (1.764V min / 1.836V max, ±2%). Sources up to 1A of load current. Requires a 10uF tantalum output capacitor for stability.
3	VIN	power_in	Unregulated input supply pin. Operating range up to 15V (typ) / 18V (abs max); must be at least Vout + Vdropout (≥3.1V for the 1.8V fixed variant per electrical characteristics). Recommend 10uF tantalum bypass capacitor to GND.
4	VOUT	power_out	SOT-223 tab pin, electrically connected to VOUT (pin 2). Acts as the primary heatsinking pad; solder to a copper pour to reduce thermal resistance (θJC ≈ 20°C/W, dropping toward ~30°C/W total with a 5cm×5cm 2-side pour).

Key specifications

Parameter	Value
Manufacturer	MSKSEMI AMS1117 1 8V
Package	SOT-223
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

AMS1117-18
AMS1117CD-18

CAD (KiCad official)

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

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 406 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: MSKSEMI AMS1117 1 8V datasheet (14 pp, sha256 768f1a5d913d6211, 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