78L09 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	OUT	power_out	Regulated positive output, nominal +9 V (8.64 - 9.36 V at Tj = 25 °C). Deliverable output current up to ~100 mA. A 0.1 µF ceramic output capacitor to GND is recommended for stability.
2	GND	power_in	Common ground / reference return for both the input and output sides of the regulator.
3	IN	power_in	Unregulated positive input supply. Absolute max 35 V; typical operating range 11.4 V - 24 V for a regulated 9 V output. A 0.33 µF input capacitor to GND is recommended when the regulator is located far from the bulk supply filter.

Key specifications

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

CAD (KiCad official)

Symbol: 78L09
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
`78l09.step`	57 KB	You want the bare part, or you mark your own boards.
`78l09-etched.step`	974 KB	You want the part with `78L09` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 258 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 cc83a993874b173a, 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