MC79M05BDTRKG 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	GND	power_in	Common ground reference. Must be shared between the input and output voltages. In the DPAK-3 package this pin is also electrically common with the tab (pin 4).
2	VI	power_in	Unregulated negative input supply. Absolute maximum input voltage is -35 Vdc. Must remain typically 1.1 V more negative than VO (dropout voltage) even during ripple peaks. A 0.33 uF input bypass capacitor (Cin) is recommended when the regulator is located an appreciable distance from the power supply filter.
3	VO	power_out	Regulated -5.0 V output (tolerance +/-4.0% for the B-grade, TJ = -40 to +125 C). Delivers up to 500 mA with proper heatsinking. A 1.0 uF output capacitor (CO) is recommended to improve stability and transient response.
4	TAB	power_in	Exposed thermal tab on the DPAK-3 package. Electrically connected to pin 1 (GND). Should be soldered to a copper pour for heat dissipation; copper area determines effective theta_JA (see Figure 1 on page 4).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MC79M05BDTRKG
MC79M05BDTRKGBDTG
MC79M05BDTRKGCDT
MC79M05BDTRKGCDTG
MC79M05BDTRKGCDTRK
MC79M05BDTRKGCDTRKG
MC79M05BDTRKGBT
MC79M05BDTRKGBTG
MC79M05BDTRKGCT
MC79M05BDTRKGCTG

CAD (KiCad official)

Symbol: MC79M05BDTRKG
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
`mc79m05bdtrkg.step`	119 KB	You want the bare part, or you mark your own boards.
`mc79m05bdtrkg-etched.step`	2.1 MB	You want the part with `MC79M05BDTRKG` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 547 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 (9 pp, sha256 cab487486a5292f6, 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