CJ88120 from Changjing, in a SOT-89-3L. 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 terminal. All voltages in the datasheet are referenced to this pin. Connect directly to system ground and to the negative terminals of CIN and COUT.
2	IN	power_in	Unregulated input supply pin (VIN). Operating range 2.5V to 60V (absolute max -0.3 to 65V). Decouple with a 1.0μF or larger low-ESR capacitor placed as close as possible to the pin.
3	OUT	power_out	Regulated 12V output (VOUT) capable of sourcing up to 150mA (400mA absolute max). Dropout is 500mV at 50mA (for the 3.3V option). Requires a 1.0μF or larger output capacitor (10μF recommended) with good frequency characteristics for stability.

Key specifications

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

CAD (KiCad official)

Symbol: CJ88120
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cj88120.step`	57 KB	You want the bare part, or you mark your own boards.
`cj88120-etched.step`	1.3 MB	You want the part with `CJ88120` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 341 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 (8 pp, sha256 c2050774e448f2b1, 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