BL1084-33-CY from BL Shanghai Belling, in a TO-252-2(DPAK). 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 fixed-voltage regulator. Return path for all quiescent current (~5 mA typ).
2	Vout	power_out	Regulated 3.3V output (3.25 V to 3.35 V typical at 25 °C). Sourcing up to 5 A. Requires a 22 µF tantalum output capacitor for stability.
3	Vin	power_in	Unregulated input supply. Must be at least Vout + 1.4V (typ) at 5A. Absolute maximum 15V. Requires a 10 µF tantalum bypass capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	TO-252-2(DPAK)
Category	PMIC
Pins	3

Ordering variants

BL1084-33-CYY
BL1084-33-CYS
BL1084-33-CYS1
BL1084-33-CYZ

CAD (KiCad official)

Symbol: BL1084-33-CY
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl1084-33-cy.step`	119 KB	You want the bare part, or you mark your own boards.
`bl1084-33-cy-etched.step`	2.0 MB	You want the part with `BL1084-33-CY` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 511 faces against 83 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 (13 pp, sha256 bb5efe271c8036b3, 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