BL9161G-33BPRT from BL Shanghai Belling, in a SOT-23-3. 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. Connect to the system ground plane.
2	VOUT	power_out	Regulated 3.3V output (±2%). Requires at least 1µF output capacitor (2.2µF recommended for 1.2V/1.5V/1.8V variants) for stability. Supplies up to 300mA with 205mV dropout.
3	VIN	power_in	Power input voltage, 2.2V to 6V. A 1µF input decoupling capacitor is recommended. Absolute maximum -0.3V to +6V.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-23-3
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

BL9161G-33BPRT
BL9161G-33BPRTRN
BL9161G-33BPRTURN
BL9161G-33BPRTDRN

CAD (KiCad official)

Symbol: BL9161G-33BPRT
Footprint: Package_TO_SOT_SMD:SOT-23-3
3D model: SOT-23-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl9161g-33bprt.step`	59 KB	You want the bare part, or you mark your own boards.
`bl9161g-33bprt-etched.step`	2.5 MB	You want the part with `BL9161G-33BPRT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 610 faces against 69 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 (12 pp, sha256 74f47540de0b9365, 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