MC78M15BDTRKG 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	VIN	power_in	Unregulated positive input voltage. For the 15 V regulator, operating input range is 17.5 V-30 V (max 35 V absolute). Bypass with a ~0.33 µF ceramic to ground close to the pin.
2	GND	power_in	Common ground reference for the regulator. The exposed heatsink tab (pin 4) is electrically connected to this pin.
3	VOUT	power_out	Regulated +15 V output, up to 500 mA with adequate heatsinking (350 mA typical test conditions). Recommend a ~0.1 µF output bypass capacitor for transient response.
4	GND (Tab)	power_in	Exposed metal heatsink tab on the DPAK-3 package. Electrically shorted to pin 2 (Ground). Solder to a copper pour for heat spreading; the pour is at ground potential.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MC78M15BDTRKG
MC78M15BDTRKGCDTRKG
MC78M15BDTRKGABDTRKG
MC78M15BDTRKGACDTRKG
MC78M15BDTRKGBTG
MC78M15BDTRKGCTG
MC78M15BDTRKGABTG
MC78M15BDTRKGACTG

CAD (KiCad official)

Symbol: MC78M15BDTRKG
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
`mc78m15bdtrkg.step`	119 KB	You want the bare part, or you mark your own boards.
`mc78m15bdtrkg-etched.step`	2.1 MB	You want the part with `MC78M15BDTRKG` 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 (14 pp, sha256 6ff0b93f1bfb0373, 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