79L12 from TWGMC, in a SOT-89. 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 reference pin. Common return for input and output; for a negative regulator this pin is the most-positive terminal.
2	IN	power_in	Unregulated negative input voltage. Absolute max Vi = -35 V; typical operating range -14.5 V to -27 V. Bypass with a 0.33 uF capacitor (Ci) close to the pin.
3	OUT	power_out	Regulated -12 V output (typ). Delivers up to 100 mA (IOM 0.1 A). Bypass with a 0.1 uF capacitor (Co) close to the pin for optimum stability and transient response.

Key specifications

Parameter	Value
Manufacturer	TWGMC
Package	SOT-89
Category	PMIC
Pins	3

CAD (KiCad official)

Symbol: 79L12
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`79l12.step`	57 KB	You want the bare part, or you mark your own boards.
`79l12-etched.step`	820 KB	You want the part with `79L12` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 227 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: TWGMC datasheet (2 pp, sha256 c1a0d6c49d6d3487, retrieved 2026-08-17, tier: lcsc)
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