L78M05ACDT-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 DC input voltage. For a 5 V output, VI must be at least ~7 V (dropout ≈ 2 V typ). Absolute max VI = 35 V. A 0.33 µF ceramic bypass capacitor to GND is recommended close to this pin.
2	GND	power_in	Ground / common reference for input and output. On the DPAK package the GND pin is electrically and thermally common with the exposed metal tab, which serves as the primary heat-sinking surface (RthJC = 8 °C/W, RthJA = 100 °C/W).
3	OUTPUT	power_out	Regulated +5 V output, 4.8 V to 5.2 V over line/load/temperature. Delivers up to 500 mA (guaranteed 350 mA test condition) with internal short-circuit current limit (~300 mA typ, 700 mA peak). A 0.1 µF ceramic capacitor to GND improves transient response.
TAB	GND	power_in	Exposed DPAK metal tab, internally connected to pin 2 (GND). Provides the primary thermal path to the PCB copper pour for heat 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.

L78M05ACDT-TR
L78M05ACDT-TRT
L78M05ACDT-TRCV

CAD (KiCad official)

Symbol: L78M05ACDT-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
`l78m05acdt-tr.step`	119 KB	You want the bare part, or you mark your own boards.
`l78m05acdt-tr-etched.step`	1.7 MB	You want the part with `L78M05ACDT-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 468 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 (29 pp, sha256 06d79d9f1c19140c, 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