L7912CV-DG from STMicroelectronics, 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	GND	power_in	Common / ground reference. For a negative regulator this is the return that sits above both the negative input (VI) and negative output (VO).
2	IN	power_in	Negative unregulated input supply. Absolute maximum -35 V for VO = -5 to -18 V variants (covers L7912). Requires an input capacitor (CI = 2.2 uF per test circuit) close to the pin for stability.
3	OUT	power_out	Regulated -12 V output, sourcing up to 1.5 A with adequate heatsinking. Requires an output capacitor (CO = 1 uF per test circuit) to guarantee transient response and stability.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

L7912CV-DG
L7912CP
L7912CD2T-TR

CAD (KiCad official)

Symbol: L7912CV-DG
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
`l7912cv-dg.step`	83 KB	You want the bare part, or you mark your own boards.
`l7912cv-dg-etched.step`	754 KB	You want the part with `L7912CV-DG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 203 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: STMicroelectronics datasheet (24 pp, sha256 68ee756997bb737a, 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