MC78M05BDTRKG from onsemi, 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	VI	power_in	Unregulated input voltage. Operating range up to 25 Vdc for the 5 V variant; absolute maximum input voltage is 35 Vdc. Typical dropout is 2.0 V; a bulk input capacitor is recommended when the regulator is located far from the filter capacitor.
2	GND	power_in	Common ground reference for input and output. Also thermally bonded to the heatsink tab (pin 4 of the case outline is internally connected to pin 2).
3	VO	power_out	Regulated +5.0 V output (4.8-5.2 V at TJ=25 °C). Rated for 500 mA maximum with adequate heatsinking; short-circuit current limit ~350 mA, peak output current ~700 mA. A small output capacitor improves transient response.
4	TAB	passive	Exposed heatsink tab on the DPAK-3 case outline; internally connected to pin 2 (Ground). Solder to a copper pour for thermal dissipation.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MC78M05BDTRKG
MC78M05BDTRKGCDTRKG
MC78M05BDTRKGABDTRKG
MC78M05BDTRKGACDTRKG
MC78M05BDTRKGBTG
MC78M05BDTRKGCTG
MC78M05BDTRKGABTG
MC78M05BDTRKGACTG

CAD (KiCad official)

Symbol: MC78M05BDTRKG
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
`mc78m05bdtrkg.step`	119 KB	You want the bare part, or you mark your own boards.
`mc78m05bdtrkg-etched.step`	2.1 MB	You want the part with `MC78M05BDTRKG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 554 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: onsemi datasheet (16 pp, sha256 f676eb1d232d9a95, 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