MC79L05ACPG from onsemi, 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	GND	power_in	Common ground reference. Must be shared between the input and output supplies.
2	Vin	power_in	Negative input voltage. For the -5 V variant (MC79L05AC), typical input is around -10 V; absolute maximum -30 Vdc. Must remain at least ~2.0 V more negative than Vout even at the ripple minimum; a 0.33 uF bypass capacitor to ground is recommended.
3	Vout	power_out	Regulated negative output, -5.0 V nominal (-4.8 V to -5.2 V at Tj = 25 C), up to 100 mA. A 0.1 uF output bypass capacitor is recommended to improve stability and transient response.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MC79L05ACPG
MC79L05ACPGACPRPG
MC79L05ACPGACPRAG
MC79L05ACPGACDG
MC79L05ACPGACDR2G

CAD (KiCad official)

Symbol: MC79L05ACPG
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
`mc79l05acpg.step`	27 KB	You want the bare part, or you mark your own boards.
`mc79l05acpg-etched.step`	1.7 MB	You want the part with `MC79L05ACPG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 423 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: onsemi datasheet (14 pp, sha256 115a59773830cb30, 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