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L78L33ACUTR

Public Unreviewed

by Ray

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

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L78L33ACUTR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

L78L33ACUTR 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 +3.3 V output. Delivers up to 100 mA with internal current limiting and thermal shutdown protection. Recommended output capacitor CO = 0.1 µF for stability.
2 GND power_in Common ground reference for the regulator. In SOT-89 this pin is the center lead and is also connected to the die-attach tab used for heat-sinking.
3 VIN power_in Unregulated DC input voltage. Absolute maximum 30 V for the 3.3-9 V output variants. Recommended input capacitor CI = 0.33 µF placed close to the pin if the device is far from the bulk supply filter.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • L78L33ACUTR
  • L78L33ACUTRACZ
  • L78L33ACUTRACZ-AP
  • L78L33ACUTRABZ-AP
  • L78L33ACUTRABD-TR
  • L78L33ACUTRACD13TR

CAD (KiCad official)

  • Symbol: L78L33ACUTR
  • 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
l78l33acutr.step 57 KB You want the bare part, or you mark your own boards.
l78l33acutr-etched.step 1.6 MB You want the part with L78L33ACUTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 411 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 (47 pp, sha256 385835a89181b63c, retrieved 2026-08-17, tier: lcsc)
  • 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