MC78M15CDTG 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. Absolute maximum 35 Vdc (40 Vdc for 20-24 V options). Must be at least ~2 V above the regulated output for the device to remain in regulation. A small input bypass capacitor is recommended when the device is located far from the filter capacitor.
2	Ground	power_in	Common ground reference for the regulator. The heatsink tab (terminal 4 in the case outline drawing) is internally connected to Pin 2 in the DPAK-3 package.
3	Output	power_out	Regulated +15 V output, typically 15.0 V (14.4 to 15.6 V over tolerance for MC78M15C). Sources up to 500 mA continuous with adequate heatsinking; short-circuit current limit typ. 350 mA. An output bypass capacitor improves transient response.
4	Heatsink/Ground	passive	Exposed heatsink tab on the DPAK package. Internally bonded to Pin 2 (Ground); solder to a copper pour for thermal dissipation. Not an independent electrical node.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MC78M15CDTG
MC78M15CDTGDTRKG

CAD (KiCad official)

Symbol: MC78M15CDTG
Footprint: Package_TO_SOT_SMD:TO-252-2
3D model: DPAK-3 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: onsemi datasheet (15 pp, sha256 2339bbc0a38dcd3b, 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