MC7812BTG from onsemi, in a TO-220AB. 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. Must remain typically 2.0 V above VOUT even at the ripple minimum; absolute max input for Case 936 is 35 V. A 0.33 uF input capacitor is recommended if the regulator is far from the bulk supply filter.
2	GND	power_in	Common ground shared between input and output returns. The exposed heatsink tab of the D2PAK-3 (Case 936) package is electrically bonded to this pin.
3	VOUT	power_out	Regulated +12 V output (nominal, MC7812 variant). Delivers >1.0 A with adequate heatsinking; internally current-limited and thermally protected. An output capacitor (<0.1 uF may cause instability; ~0.1 uF or larger recommended) improves transient response.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MC7812BTGT
MC7812BTG
MC7812BTGD2T
MC7812BTGDT
MC7812BTGDTRK

CAD (KiCad official)

Symbol: MC7812BTG
Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
3D model: TO-220AB (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mc7812btg.step`	83 KB	You want the bare part, or you mark your own boards.
`mc7812btg-etched.step`	849 KB	You want the part with `MC7812BTG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 223 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 92281b28af847a90, 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