L78L15ABUTR from STMicroelectronics, 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 +15 V positive output. Delivers up to 100 mA with typical dropout of ~1.7 V (VIN must be ≥ ~17 V for full regulation). A 0.1 µF ceramic bypass capacitor to GND close to this pin is recommended to improve transient response and stability.
2	GND	power_in	Device ground / common return for input and output. In the SOT-89 package the GND pin is electrically bonded to the die-attach flag on the bottom of the package, which serves as the primary thermal path to the PCB copper.
3	VIN	power_in	Unregulated positive DC input. Absolute maximum 35 V for the 15 V variant; recommended VIN ≥ VOUT + dropout (~17 V) for full regulation. Bypass with a 0.33 µF ceramic capacitor to GND close to this pin to prevent oscillation and improve line transient response.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

L78L15ABUTR
L78L15ABUTRZ
L78L15ABUTRAZ
L78L15ABUTRABZ
L78L15ABUTRCZ
L78L15ABUTRACZ
L78L15ABUTRD
L78L15ABUTRD-TR
L78L15ABUTRABD

CAD (KiCad official)

Symbol: L78L15ABUTR
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
`l78l15abutr.step`	57 KB	You want the bare part, or you mark your own boards.
`l78l15abutr-etched.step`	1.4 MB	You want the part with `L78L15ABUTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 378 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: STMicroelectronics datasheet (45 pp, sha256 43922ae159face7e, 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