L78L05ACZ from STMicroelectronics, in a TO-92-3. 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	VOUT	power_out	Regulated +5 V output, up to 100 mA. A 0.1 µF ceramic capacitor to GND is recommended for stability and transient response.
2	GND	power_in	Common ground reference for both input and output. Also serves as the thermal return path.
3	VIN	power_in	Unregulated DC input, absolute maximum 30 V (for 3.3-9 V output variants). A 0.33 µF capacitor to GND close to the pin is recommended to suppress input transients.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	TO-92-3
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

L78L05ACZZ
L78L05ACZD
L78L05ACZD-TR
L78L05ACZU
L78L05ACZU-TR

CAD (KiCad official)

Symbol: L78L05ACZ
Footprint: Package_TO_SOT_THT:TO-92_Inline
3D model: TO-92-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`l78l05acz.step`	27 KB	You want the bare part, or you mark your own boards.
`l78l05acz-etched.step`	1.3 MB	You want the part with `L78L05ACZ` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 325 faces against 19 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: STMicroelectronics datasheet (46 pp, sha256 aebc91bfc9b4bb67, retrieved 2026-08-17, tier: manufacturer)
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