L79L05ABUTR 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	GND	power_in	Ground / common return. Reference for both input and output voltages. On the L79L negative regulator, GND is the most positive terminal in typical operation (VIN and VOUT are both negative with respect to this pin).
2	VIN	power_in	Unregulated negative DC input. Absolute maximum -30 V for the -5 V version. Bypass to GND with a 0.33 µF capacitor located close to the pin. Note: in SOT-89 the metal tab/heatsink slug is electrically connected to this pin.
3	VOUT	power_out	Regulated -5 V negative output. Delivers up to 100 mA (internally current-limited, thermally protected). Bypass to GND with a 0.1 µF output capacitor for stability and 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.

L79L05ABUTR
L79L05ACUTR
L79L12ACUTR
L79L15ACUTR
L79L05ACZ
L79L05ABZ-AP
L79L08ACZ-AP
L79L05ACZ-TR
L79L12ACZ-TR
L79L05ABD13TR
L79L05ACD13TR
L79L08ACD13TR
L79L12ACD13TR
L79L15ABD13TR
L79L15ACD13TR

CAD (KiCad official)

Symbol: L79L05ABUTR
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
`l79l05abutr.step`	57 KB	You want the bare part, or you mark your own boards.
`l79l05abutr-etched.step`	1.5 MB	You want the part with `L79L05ABUTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 388 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 (24 pp, sha256 ba2a02bb5533f64a, 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