LR78L05A from LRC, in a SOT-89-3. 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 (4.75-5.25 V over line/load). Supplies up to 100 mA. A 0.1 µF ceramic bypass capacitor to GND is recommended close to the pin for stability and transient response.
2	GND	power_in	Ground / common return for both input and output. On SOT-89 this pin is electrically and thermally tied to the large center tab used as the primary heat-sinking pad.
3	Vin	power_in	Unregulated DC input, typically 7-20 V for 5 V version (absolute max 30 V for Vo=5-9V parts). Dropout ~1.7 V. A 0.33 µF bypass capacitor to GND close to the pin is recommended when the regulator is far from the power source's filter capacitor.

Key specifications

Parameter	Value
Manufacturer	LRC
Package	SOT-89-3
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

LR78L05A
LR78L05B

CAD (KiCad official)

Symbol: LR78L05A
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lr78l05a.step`	57 KB	You want the bare part, or you mark your own boards.
`lr78l05a-etched.step`	1.1 MB	You want the part with `LR78L05A` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 311 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: LRC datasheet (6 pp, sha256 a49a118b686fea89, 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