BL1117C-12CX from BL Shanghai Belling, 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. Connect to system ground. On SOT-223 the tab is typically tied to pin 2 (Vout); the discrete GND pin is pin 1 on the fixed-output variant.
2	Vout	power_out	Regulated 1.2V output (±2%, min 1.176V, max 1.224V) at up to 1A load current. Requires a 10uF tantalum bypass capacitor to ground for stability.
3	Vin	power_in	Unregulated input voltage supply. Recommended min 2.7V (for 1.2V output), max 12V. Dropout is 1.3V at 1A load. Requires a 10uF tantalum bypass capacitor to ground.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-223
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

BL1117C-12CX
BL1117C-12CX12CY
BL1117C-12CX12CM

CAD (KiCad official)

Symbol: BL1117C-12CX
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
`bl1117c-12cx.step`	64 KB	You want the bare part, or you mark your own boards.
`bl1117c-12cx-etched.step`	1.6 MB	You want the part with `BL1117C-12CX` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 415 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: BL Shanghai Belling datasheet (9 pp, sha256 d00b9330975215ce, 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