LDL1117S50R from STMicroelectronics, 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	Device ground reference. Common return for the input and output regulation loop; must be tied to the system ground plane.
2	VOUT	power_out	Regulated 5.0 V fixed output. Supplies up to 1.2 A of continuous output current with a typical 350 mV dropout at full load. Requires a 4.7 µF ceramic output capacitor for stability. The SOT-223 tab is internally connected to VOUT.
3	VIN	power_in	Unregulated input supply, 2.5 V to 18 V operating (20 V absolute maximum). Requires a 1 µF ceramic input capacitor placed close to the pin.
4	TAB	power_out	SOT-223 thermal tab, internally connected to VOUT. Solder to a copper pour tied to the VOUT net to provide thermal dissipation and reduce junction-to-ambient thermal resistance.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOT-223
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

LDL1117S50R

CAD (KiCad official)

Symbol: LDL1117S50R
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
`ldl1117s50r.step`	64 KB	You want the bare part, or you mark your own boards.
`ldl1117s50r-etched.step`	1.7 MB	You want the part with `LDL1117S50R` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 432 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: STMicroelectronics datasheet (23 pp, sha256 7f5923a949754b88, retrieved 2026-08-17, tier: manufacturer)
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