L78M08CDT-TR from STMicroelectronics, in a TO-252-2(DPAK). 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 supply. For an 8 V output the input must be at least Vout + Vd (Vd ~ 2 V typ.), and absolute-max is 35 V (DC). Should be bypassed with a 0.33 uF ceramic close to the pin.
2	GND	power_in	Common ground reference for both input and output. Internally tied to the DPAK exposed tab, which also serves as the thermal path (RthJC = 8 degC/W).
3	OUTPUT	power_out	Regulated +8 V output. Delivers up to 500 mA with internal current limit (Isc ~ 300 mA at Vi = 35 V, Iscp ~ 700 mA peak). A 0.1 uF ceramic to GND at the pin is recommended for stability.
TAB	GND(TAB)	power_in	DPAK exposed metal tab. Internally connected to pin 2 (GND) and used as the primary heat-sinking surface; solder to a copper pour for thermal dissipation.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	TO-252-2(DPAK)
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

L78M08CDT-TR
L78M08CDT-TRCV
L78M08CDT-TRACV
L78M08CDT-TRABV
L78M08CDT-TRCP
L78M08CDT-TRACP
L78M08CDT-TRCH

CAD (KiCad official)

Symbol: L78M08CDT-TR
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`l78m08cdt-tr.step`	119 KB	You want the bare part, or you mark your own boards.
`l78m08cdt-tr-etched.step`	1.8 MB	You want the part with `L78M08CDT-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 472 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: STMicroelectronics datasheet (47 pp, sha256 7cee4c5f6a43332c, 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