CJ6109A33GW from Changjing, in a SOT-223. 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	VSS	power_in	Device ground / negative supply return. All internal references and the output feedback divider are referenced to this pin.
2	VOUT	power_out	Regulated 3.3 V output pin. Delivers up to 1.0 A (typ, 1.3 A max). Requires a ≥4.7 µF ceramic output capacitor to ground for stability. The SOT-223 tab is typically internally connected to this pin.
3	VIN	power_in	Unregulated positive supply input. Operating range 1.6 V to 6.0 V (absolute max VSS+7 V). Requires a ≥4.7 µF ceramic input capacitor to ground close to the pin. For 3.3 V output, VIN should be ≥ VOUT + dropout (≈320 mV @ 1 A).

Key specifications

Parameter	Value
Manufacturer	Changjing
Package	SOT-223
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

CJ6109A33GW
CJ6109A33GWP
CJ6109A33GWPL
CJ6109A33GWM
CJ6109A33GWFB

CAD (KiCad official)

Symbol: CJ6109A33GW
Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
3D model: SOT-223 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cj6109a33gw.step`	64 KB	You want the bare part, or you mark your own boards.
`cj6109a33gw-etched.step`	2.3 MB	You want the part with `CJ6109A33GW` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 549 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: Changjing datasheet (10 pp, sha256 75ae8c6e825a8cea, 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