CJ78L12 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	OUT	power_out	Regulated +12 V output. Delivers up to 100 mA (0.1 A max). A 0.1 μF ceramic bypass capacitor to GND close to the pin is recommended for transient response and stability.
2	GND	power_in	Common ground reference for both input and output. The SOT-89 tab is connected to this pin and acts as the thermal path to the PCB.
3	IN	power_in	Unregulated input supply. Absolute maximum 35 V; must exceed VO by at least the dropout voltage (~1.7 V typ). A 0.33 μF input bypass capacitor to GND close to the pin is recommended.

Key specifications

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

CAD (KiCad official)

Symbol: CJ78L12
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
`cj78l12.step`	57 KB	You want the bare part, or you mark your own boards.
`cj78l12-etched.step`	1011 KB	You want the part with `CJ78L12` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 273 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 (2 pp, sha256 61a9aa2702ef7efa, 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