L78L33ABD-TR from STMicroelectronics, 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	VOUT	power_out	Regulated 3.3 V positive output, up to 100 mA. A 0.1 µF ceramic bypass capacitor to GND is recommended close to the pin for stability.
2	GND	power_in	Ground reference. Internally commoned to the die attach flag together with pins 3, 6 and 7 to improve thermal dissipation; all four pins should be tied to the ground copper pour.
3	GND	power_in	Ground reference. Internally commoned to the die attach flag together with pins 2, 6 and 7 for enhanced thermal performance.
4	NC	unconnected	No internal connection. Leave floating or tie to GND as convenient for PCB layout.
5	NC	unconnected	No internal connection. Leave floating or tie to GND as convenient for PCB layout.
6	GND	power_in	Ground reference. Internally commoned to the die attach flag together with pins 2, 3 and 7 for enhanced thermal performance.
7	GND	power_in	Ground reference. Internally commoned to the die attach flag together with pins 2, 3 and 6 for enhanced thermal performance.
8	VIN	power_in	Unregulated positive input voltage. Absolute maximum 30 V for the 3.3 V version; a 0.33 µF bypass capacitor to GND is recommended close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

L78L33ABD-TRD
L78L33ABD-TR
L78L33ABD-TRZ
L78L33ABD-TRAZ
L78L33ABD-TRCUTR
L78L33ABD-TRACUTR

CAD (KiCad official)

Symbol: L78L33ABD-TR
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
`l78l33abd-tr.step`	122 KB	You want the bare part, or you mark your own boards.
`l78l33abd-tr-etched.step`	2.3 MB	You want the part with `L78L33ABD-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 562 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: STMicroelectronics datasheet (45 pp, sha256 43922ae159face7e, 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