CJ78L09 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 9.0V output (tolerance ±3% at TJ=25°C, ±5% over operating TJ). Rated for >100mA. Requires ~0.1µF ceramic bypass capacitor to GND.
2	GND	power_in	Regulator ground / common reference for input and output.
3	IN	power_in	Unregulated DC input to the device. Maximum VIN = 30V for the CJ78L09 variant. Requires a ~0.33µF ceramic bypass capacitor to GND when the device is more than a few inches from the input filter.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

CJ78L09
CJ78L09-TA

CAD (KiCad official)

Symbol: CJ78L09
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
`cj78l09.step`	57 KB	You want the bare part, or you mark your own boards.
`cj78l09-etched.step`	1.1 MB	You want the part with `CJ78L09` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 288 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 (32 pp, sha256 9262a4d45d64c12c, 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