AMS1117S-3.3 from JSMSEMI, 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	GND	power_in	Ground reference pin. On the fixed 3.3V version this pin is the device ground return; the internal voltage divider references this pin.
2	VOUT	power_out	Regulated 3.3V output pin (typical 3.30V, min 3.234V, max 3.366V). Requires a minimum 10uF tantalum capacitor to GND (ESR ≤ 0.5Ω) for compensation and stability. Capable of sourcing up to 1A.
3	VIN	power_in	Unregulated input voltage pin. Maximum input voltage 30V; requires at least VOUT + 1.3V (dropout) for regulation. A 10uF tantalum input bypass capacitor is recommended.

Key specifications

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

CAD (KiCad official)

Symbol: AMS1117S-3.3
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
`ams1117s-3-3.step`	57 KB	You want the bare part, or you mark your own boards.
`ams1117s-3-3-etched.step`	1.5 MB	You want the part with `AMS1117S-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: 405 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: JSMSEMI datasheet (9 pp, sha256 fa4bc29b88340b9a, 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