L78M05CDT-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. Absolute maximum 35 V (for 5-18 V output versions). Bypass to GND with a 0.33 uF ceramic close to the pin for stability.
2	GROUND	power_in	Common ground reference. Internally connected to the exposed thermal tab of the DPAK package; both must be tied to the system ground plane for return current and heatsinking.
3	OUTPUT	power_out	Regulated +5 V output, 500 mA rated (higher with adequate heatsinking). Requires a 0.1 uF ceramic to GND close to the pin for transient response and stability.
TAB	GROUND	power_in	Exposed thermal pad on the back of the DPAK, electrically tied to the GROUND pin (pin 2). Must be soldered to a copper pour to remove heat (RthJC = 8 degC/W).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

L78M05CDT-TR
L78M05CDT-TRCV
L78M05CDT-TRCP
L78M05CDT-TRCH

CAD (KiCad official)

Symbol: L78M05CDT-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
`l78m05cdt-tr.step`	119 KB	You want the bare part, or you mark your own boards.
`l78m05cdt-tr-etched.step`	1.7 MB	You want the part with `L78M05CDT-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 452 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 (45 pp, sha256 aab13a77a9bc7601, 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