CJ7533S from Changjing, in a SOT-89-3. 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	Ground / VSS reference. Common return for input and output; tie to the system ground plane. Also serves as the exposed SOT-89 heat-sink tab for thermal dissipation.
2	IN	power_in	Unregulated input supply, VIN. Operating range 2.5 V to 36 V (absolute max 40 V). Bypass to GND with ≥1 µF ceramic or tantalum for stability and PSRR.
3	OUT	power_out	Regulated 3.3 V output, VOUT. Sources up to 300 mA (600 mA absolute max). Requires ≥1 µF ceramic or tantalum output capacitor to GND for stability and transient response.

Key specifications

Parameter	Value
Manufacturer	Changjing
Package	SOT-89-3
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

CJ7533SS

CAD (KiCad official)

Symbol: CJ7533S
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cj7533s.step`	57 KB	You want the bare part, or you mark your own boards.
`cj7533s-etched.step`	1.2 MB	You want the part with `CJ7533S` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 311 faces against 42 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 (6 pp, sha256 d76ea5eea44dc63d, 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