MC78M05CDTRKG from onsemi, in a DPAK-3. 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 input supply. Recommended operating range 7.0 V to 25 Vdc for the 5.0 V variant; absolute max 35 Vdc. A ~0.33 uF bypass capacitor is recommended close to the pin when the device is far from the main filter capacitor.
2	Ground	power_in	Common return / ground reference for both input and output. In the DPAK-3 package the heatsink tab (terminal 4 in the case outline) is internally connected to this pin.
3	Output	power_out	Regulated +5.0 V output, 500 mA maximum with adequate heatsinking (typical VO 5.0 V, tolerance +/-4% over line/load/temperature for the C grade). Dropout voltage typ 2.0 V. A ~0.1 uF output capacitor is recommended for transient response.
4	Ground (Tab)	power_in	Heatsink tab on the DPAK-3 package outline. Internally shorted to Pin 2 (Ground); commonly soldered to a copper pour to spread heat.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	DPAK-3
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

MC78M05CDTRKG
MC78M05CDTRKGDTG
MC78M05CDTRKGTG

CAD (KiCad official)

Symbol: MC78M05CDTRKG
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: DPAK-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mc78m05cdtrkg.step`	119 KB	You want the bare part, or you mark your own boards.
`mc78m05cdtrkg-etched.step`	2.1 MB	You want the part with `MC78M05CDTRKG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 538 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 (15 pp, sha256 4ae6cd4978cb4cd9, 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