BL9161G-28BARN from BL Shanghai Belling, in a SOT-23-5. 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	VIN	power_in	Power input voltage. Operating range 2.2V to 6V; absolute maximum -0.3V to +6V. Bypass with a >=1uF ceramic capacitor located within 0.5 inch of the pin.
2	GND	power_in	Device ground. Return input and output capacitor grounds to this pin via a clean analog ground plane.
3	EN	input	Chip enable. Active high with an internal pull-down resistor (suffix 'A' variant). Drive above VIH=1.2V to enable the LDO; below VIL=0.4V places the part in shutdown (ISTBY typ 0.01uA). Absolute max -0.3V to VIN.
4	NC	unconnected	No internal connection. Leave floating or tie to a convenient net; no functional effect.
5	VOUT	power_out	Regulated output voltage (2.8V fixed for -28 variant, ±2% accuracy, up to 300mA). Requires a >=1uF ceramic output capacitor (>=2.2uF for 1.2V/1.5V/1.8V variants) with ESR > 25 mOhm, placed within 0.5 inch of the pin.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

BL9161G-28BARN
BL9161G-28BARNURN
BL9161G-28BARNDRN
BL9161G-28BARNRT

CAD (KiCad official)

Symbol: BL9161G-28BARN
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl9161g-28barn.step`	85 KB	You want the bare part, or you mark your own boards.
`bl9161g-28barn-etched.step`	2.6 MB	You want the part with `BL9161G-28BARN` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 623 faces against 102 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