BL1117-50CX from BL Shanghai Belling, in a SOT-223-3. 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	Device ground reference. Must be tied to the system ground for both the input and output bypass capacitor return paths.
2	Vout	power_out	Regulated output. Fixed 5.0V (±2%) at up to 1A load current. Requires a >=10uF tantalum or MLCC output capacitor (ESR 3mΩ-22Ω) for stability. Internal current limit ≥1A and thermal shutdown protect the device.
3	Vin	power_in	Unregulated input supply. Operating range up to Max 12V (absolute max 15V). Requires >=10uF tantalum or MLCC input bypass capacitor. Dropout is 1.3V typ at 1A (so Vin ≥ ~6.3V for a full-load 5.0V output).

Key specifications

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

Ordering variants

BL1117-50CX
BL1117-50CXAX
BL1117-50CXCY
BL1117-50CXAY

CAD (KiCad official)

Symbol: BL1117-50CX
Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
3D model: SOT-223-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl1117-50cx.step`	64 KB	You want the bare part, or you mark your own boards.
`bl1117-50cx-etched.step`	1.6 MB	You want the part with `BL1117-50CX` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 408 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 (15 pp, sha256 57ea14e7e58a4f29, 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