CJ78M12 from Changjing, in a TO-252-2(DPAK). 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	IN	power_in	Unregulated input voltage. Absolute maximum 35V; recommended operating range 14.5V to 30V. Bypass to GND with a 0.33uF ceramic capacitor close to the pin.
2	GND	power_in	Common ground reference for both input and output. On the TO-252-2L variant this pin is fused to the exposed tab/heat sink.
3	OUT	power_out	Regulated +12V output. Nominal 12V (11.4-12.6V over full temperature range); supplies up to 0.5A peak (0.7A internal current limit). Requires a 0.1uF output capacitor to GND for stability.

Key specifications

Parameter	Value
Manufacturer	Changjing
Package	TO-252-2(DPAK)
Category	PMIC
Pins	3

CAD (KiCad official)

Symbol: CJ78M12
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cj78m12.step`	119 KB	You want the bare part, or you mark your own boards.
`cj78m12-etched.step`	1.4 MB	You want the part with `CJ78M12` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 363 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 (1 pp, sha256 235ab67f614603e6, 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