CJ79L05 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 reference. Common return for input and output; on SOT-89 this pin is also the thermal tab.
2	IN	power_in	Negative unregulated input voltage (Vi). Rated for -7 V to -20 V typical operating range, absolute maximum -30 V. Bypass with a 0.33 µF capacitor to GND close to the pin.
3	OUT	power_out	Regulated -5 V output (-4.75 V to -5.25 V over line/load/temperature). Delivers up to 100 mA (recommended operating 70 mA over full temp). Bypass with 0.1 µF capacitor to GND.

Key specifications

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

CAD (KiCad official)

Symbol: CJ79L05
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
`cj79l05.step`	57 KB	You want the bare part, or you mark your own boards.
`cj79l05-etched.step`	1.0 MB	You want the part with `CJ79L05` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 281 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 cea437b9974b333f, 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