L78L24ACUTR from STMicroelectronics, in a SOT-89-3. 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	VOUT	power_out	Regulated +24 V output (±4% for the 'AC' grade). Sources up to 100 mA. A 0.1 µF ceramic capacitor to GND is recommended for stability and transient response.
2	GND	power_in	Common ground reference. On SOT-89 the center lead is also the thermal/heat-sink tab, so the connected copper pour dominates the junction-to-ambient thermal resistance (RthJA ≈ 55 °C/W with 6 cm² copper).
3	VIN	power_in	Unregulated positive input supply. For the 24 V variant, absolute maximum VI = 40 V; dropout is typically 2 V so VI must be ≥ ~26 V for regulation. A 0.33 µF input capacitor to GND is recommended, especially if the regulator is remote from the bulk supply.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOT-89-3
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

L78L24ACUTR
L78L24ACUTR13TR
L78L24ACUTRACZ
L78L24ACUTRACAP
L78L24ACUTRACD
L78L24ACUTRACD13TR

CAD (KiCad official)

Symbol: L78L24ACUTR
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`l78l24acutr.step`	57 KB	You want the bare part, or you mark your own boards.
`l78l24acutr-etched.step`	1.4 MB	You want the part with `L78L24ACUTR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 379 faces against 42 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