MC33063ADR from Texas Instruments, 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	High-current internal output switch collector. Rated for up to 1.5 A switch current and 40 V collector-emitter voltage; typically tied to the boost inductor or buck catch node.
2	Switch Emitter	output	High-current internal output switch emitter. Handles up to 1.5 A of switch current; connect to the switching node or ground depending on topology (boost/buck/inverting).
3	Timing Capacitor	passive	External timing capacitor (CT) node that sets the oscillator switching frequency (up to 100 kHz). Charge current ~35 uA typ, discharge ~220 uA typ.
4	GND	power_in	Device ground reference. On the DRJ (QFN) package the exposed thermal pad is electrically bonded internally to this pin.
5	Comparator Inverting Input	input	Inverting input of the internal error comparator, referenced to the internal 1.25 V regulator (Vth = 1.225-1.275 V). Connect to a resistor-divider feedback network from the regulator output. Input range -0.3 V to 40 V; input bias current up to -400 nA.
6	VCC	power_in	Logic supply voltage input. Operating range 3 V to 40 V (abs max 40 V). Typically tied to VIN. Supply current <= 4 mA.
7	Ipk Sense	input	Current-limit sense input. An external sense resistor from VCC to this pin sets the peak switch current limit; internal threshold Vipk = 300 mV typ (250-350 mV).
8	Driver Collector	output	Darlington pair driver transistor collector. Can be tied to pin 1 for Darlington operation, or biased separately through a resistor to VCC for non-Darlington operation (lower Vce(sat) ~0.45 V). Ic(driver) abs max 100 mA at 40 V.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

MC33063ADR
MC33063ADRD
MC33063ADRJR
MC33063ADRJ
MC33063ADRP
MC33063ADRPE4

CAD (KiCad official)

Symbol: MC33063ADR
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
`mc33063adr.step`	122 KB	You want the bare part, or you mark your own boards.
`mc33063adr-etched.step`	2.5 MB	You want the part with `MC33063ADR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 599 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: Texas Instruments datasheet (32 pp, sha256 bad86a3b68c35766, 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