MC7812CTG from onsemi, in a TO-220. 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	Vin	power_in	Unregulated positive input voltage. For a 12 V output the input must remain typically 2.0 V above Vout even at the ripple trough (dropout ~2.0 V); absolute maximum input is 35 Vdc. A 0.33 uF ceramic (Cin) is recommended if the regulator is located an appreciable distance from the power-supply filter.
2	GND	power_in	Common ground reference shared by the input and output. In the TO-220 (Case 221AB) package the heatsink tab is electrically connected to Pin 2 (GND), so the tab may be bonded directly to a grounded heatsink without an insulator.
3	Vout	power_out	Regulated +12 V positive output, capable of delivering in excess of 1.0 A with adequate heatsinking (short-circuit current limit typ. 0.2 A at Vin=35 V; peak output current typ. 2.2 A). An output capacitor Co (>=0.1 uF) is not required for stability but improves transient response.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	TO-220
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

MC7812CTG
MC7812CTGD2T
MC7812CTGDT

CAD (KiCad official)

Symbol: MC7812CTG
Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
3D model: TO-220 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mc7812ctg.step`	83 KB	You want the bare part, or you mark your own boards.
`mc7812ctg-etched.step`	823 KB	You want the part with `MC7812CTG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 216 faces against 48 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 (31 pp, sha256 ad3f70896343dcf0, 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