78M09 from UMW, in a TO-252. 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	INPUT	power_in	Unregulated positive DC input to the regulator. For Vo=9V, recommended Vi range is 11.5 V to 24 V; absolute maximum Vi = 35 V. A 0.33 uF input capacitor (Ci) is recommended close to the pin for stability.
2	GND	power_in	Common ground reference for both input and output. On TO-252 the GND pin is electrically connected to the tab/heat-slug used for PCB heatsinking.
3	OUTPUT	power_out	Regulated +9 V output (typ 9.0 V, min 8.64 V / max 9.36 V at 25 C). Delivers up to 1 A with internal current-limit around 800 mA short-circuit and 1.3 A peak. A 0.1 uF output capacitor (Co) is recommended for transient response.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	TO-252
Category	PMIC
Pins	3

CAD (KiCad official)

Symbol: 78M09
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`78m09.step`	119 KB	You want the bare part, or you mark your own boards.
`78m09-etched.step`	1.3 MB	You want the part with `78M09` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 324 faces against 83 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: UMW datasheet (16 pp, sha256 162df1416fa16ead, 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