BL1117C-33CM from BL Shanghai Belling, in a SOT-89-3L. 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 for the regulator. Return path for both quiescent current (~2mA typ) and the regulated load current up to 1A.
2	Vout	power_out	Regulated 3.3V output (3.234V-3.366V, ±2%) at up to 1A. A 10 µF tantalum output capacitor to GND is required for stability.
3	Vin	power_in	Unregulated input supply. Recommended operating range up to 12V (absolute max 15V). A 10 µF tantalum bypass capacitor to GND is recommended. Requires Vin ≥ 4.8V for 3.3V regulation at 1A (dropout 1.3V typ, 1.5V max).

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-89-3L
Category	PMIC
Pins	3

Ordering variants

BL1117C-33CM33CM
BL1117C-33CM33AM
BL1117C-33CM12CM
BL1117C-33CM18CM
BL1117C-33CM25CM
BL1117C-33CM50CM
BL1117C-33CM33CX
BL1117C-33CM33AX
BL1117C-33CM12CX
BL1117C-33CM18CX
BL1117C-33CM25CX
BL1117C-33CM50CX
BL1117C-33CM33CY
BL1117C-33CM33AY
BL1117C-33CM12CY
BL1117C-33CM18CY
BL1117C-33CM25CY
BL1117C-33CM50CY

CAD (KiCad official)

Symbol: BL1117C-33CM
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3L (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: BL Shanghai Belling datasheet (11 pp, sha256 75593a439c9d03a8, 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