78L05U from CBI, 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	VO	power_out	Regulated +5 V output. Typical 5.0 V (4.75 V to 5.25 V) over 7 V ≤ VI ≤ 20 V and 1 mA ≤ IO ≤ 40 mA. Bypass with a 0.1 µF ceramic capacitor to GND close to the pin for stability.
2	GND	power_in	Common ground reference for both input and output. In the SOT-89 package this pin is also the thermal tab, so its PCB copper acts as the primary heatsink for Ptot up to 800 mW.
3	VI	power_in	Unregulated positive input supply, 7 V to 20 V for spec compliance (30 V absolute max). Bypass with a 0.33 µF capacitor to GND close to the pin to ensure loop stability and reject line transients.

Key specifications

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

Ordering variants

78L05UU

CAD (KiCad official)

Symbol: 78L05U
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
`78l05u.step`	57 KB	You want the bare part, or you mark your own boards.
`78l05u-etched.step`	1.0 MB	You want the part with `78L05U` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 282 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: CBI datasheet (2 pp, sha256 051ac44ab6bfa721, 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