MC33063ADR2G from onsemi, in a SOIC-8. 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	Switch Collector	output	Collector of the internal high-current NPN output switch transistor Q1. Rated 40 V, 1.5 A peak. Connects to the switching node of the boost/buck/inverting topology.
2	Switch Emitter	output	Emitter of the internal output switch transistor Q1. Rated 40 V, 1.5 A peak. Tied to GND for step-up topology or to the switch node for step-down/inverting topologies.
3	Timing Capacitor	passive	Oscillator timing capacitor pin (CT). External capacitor to GND sets the switching frequency (typ. 24-100 kHz, e.g. 1.0 nF ≈ 33 kHz).
4	GND	power_in	Device ground / negative power supply return.
5	Comparator Inverting Input	input	Inverting input of the internal error comparator. Connected to the feedback divider from the regulated output; regulates when the pin reaches the 1.25 V internal reference (Vth typ 1.25 V, 1.225-1.275 V at 25 °C).
6	VCC	power_in	Positive supply voltage input, 3.0 V to 40 V. Standby supply current typically 3.2 mA (max 4.0 mA).
7	Ipk Sense	input	Peak switch-current sense input. External sense resistor between VCC and this pin sets the peak switch current limit; the internal comparator trips at Vipk(sense) typ. 300 mV (250-350 mV).
8	Driver Collector	output	Collector of the internal driver transistor Q2 that drives the base of the output switch Q1. Rated 40 V, 100 mA. Can be tied to VCC for a Darlington configuration or through a resistor to VCC/switch node for a common-emitter configuration.

Key specifications

Parameter	Value
Manufacturer	onsemi
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

MC33063ADR2G
MC33063ADR2GDG
MC33063ADR2GPG
MC33063ADR2GP1G
MC33063ADR2GMNTXG

CAD (KiCad official)

Symbol: MC33063ADR2G
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mc33063adr2g.step`	122 KB	You want the bare part, or you mark your own boards.
`mc33063adr2g-etched.step`	2.9 MB	You want the part with `MC33063ADR2G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 691 faces against 147 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 6a2cb6e527edd54e, 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