CJ7809 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 positive input supply. Accepts 11.5 V to 27 V for regulation (absolute max 35 V). Bypass with 0.33 µF close to the pin for stability.
2	GND	power_in	Common ground reference for input and output. On TO-252-2L this pin is fused to the exposed tab/heat slug.
3	OUT	power_out	Regulated +9 V output (8.65-9.35 V at 25 °C). Delivers up to 1 A continuous, 1.5 A peak. Bypass with 0.1 µF close to the pin for transient response.

Key specifications

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

CAD (KiCad official)

Symbol: CJ7809
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
`cj7809.step`	119 KB	You want the bare part, or you mark your own boards.
`cj7809-etched.step`	1.5 MB	You want the part with `CJ7809` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 378 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 (4 pp, sha256 0d92ef93a2dffde9, 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