CJ79L12 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 / common return for the negative regulator. Also connected to the SOT-89 tab.
2	IN	power_in	Unregulated negative input voltage. Operating range roughly -14.5 V to -27 V; absolute maximum -35 V. Bypass with ~0.33 µF close to the pin.
3	OUT	power_out	Regulated -12 V output (±0.5 V at 25 °C). Delivers up to 100 mA (IOM 0.1 A). Bypass with ~0.1 µF close to the pin for transient response.

Key specifications

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

CAD (KiCad official)

Symbol: CJ79L12
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
`cj79l12.step`	57 KB	You want the bare part, or you mark your own boards.
`cj79l12-etched.step`	977 KB	You want the part with `CJ79L12` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 266 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 (1 pp, sha256 ff22f0f43dcb07f7, 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