CJ7912 from Changjing, in a TO-252-2L. 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	Common ground reference. On the TO-252-2L package pin 1 is also the tab/DAP (D-Pak) heatsink connection.
2	IN	power_in	Negative unregulated input supply. Operating range -14.5 V to -30 V (absolute maximum -35 V). Requires a 2.2 µF input capacitor (Ci) to ground for stability.
3	OUT	power_out	Regulated -12 V negative output. Delivers up to 1.5 A peak (2.1 A typical current-limit). Requires a 1 µF output capacitor (Co) to ground for transient response and stability.

Key specifications

Parameter	Value
Manufacturer	Changjing
Package	TO-252-2L
Category	PMIC
Pins	3

CAD (KiCad official)

Symbol: CJ7912
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252-2L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cj7912.step`	119 KB	You want the bare part, or you mark your own boards.
`cj7912-etched.step`	1.2 MB	You want the part with `CJ7912` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 324 faces against 83 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 (3 pp, sha256 7a1b26ae9a6e522f, 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