AMS1117-ADJS from UMW, in a SOT-89-3. 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	ADJ	input	Adjust pin for the adjustable version. Connects to the R1/R2 feedback divider that sets VOUT = VREF x (1 + R2/R1) + IADJ x R2, where VREF = 1.25V typ and IADJ = 60uA typ (120uA max). On fixed-voltage variants of the AMS1117 this same pin is the GND return; on the -ADJ variant it is the adjust input.
2	VOUT	power_out	Regulated output. Delivers up to 1A. Requires a stable output capacitor (22uF tantalum recommended) for loop stability.
3	VIN	power_in	Input supply. Absolute maximum 18V; recommended operating maximum 12V. A 10uF input capacitor is recommended for the typical application.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOT-89-3
Category	PMIC
Pins	3

Ordering variants

AMS1117-ADJS
AMS1117-ADJSADJCD

CAD (KiCad official)

Symbol: AMS1117-ADJS
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ams1117-adjs.step`	57 KB	You want the bare part, or you mark your own boards.
`ams1117-adjs-etched.step`	1.4 MB	You want the part with `AMS1117-ADJS` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 382 faces against 42 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