78M08 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. Recommended input capacitor Ci = 0.33 uF near the pin. Absolute-maximum V_I = 35 V (for V_O = 5..18 V variants). Typical operating input for 78M08 is Vi = 14 V (range 10.5..25 V).
2	GND	power_in	Common ground reference for input and output. On TO-252 and SOT-223 the exposed metal tab is electrically tied to GND and provides the primary thermal path (theta_JC = 12.5 C/W TO-252, 15 C/W SOT-223).
3	OUTPUT	power_out	Regulated +8 V output (7.68..8.32 V at 25 C, I_O = 350 mA). Sourcing up to 1 A DC (typ. short-circuit current 800 mA, peak current 1300 mA). Recommended output capacitor Co = 0.1 uF near the pin for stability.

Key specifications

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

CAD (KiCad official)

Symbol: 78M08
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
`78m08.step`	119 KB	You want the bare part, or you mark your own boards.
`78m08-etched.step`	1.3 MB	You want the part with `78M08` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 339 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