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L78L12ABUTR

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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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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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L78L12ABUTR

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

L78L12ABUTR 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 +12 V output. Deliver up to 100 mA. Recommended output decoupling capacitor 0.1 µF to GND for stability and transient response.
2 GND power_in Common ground / reference return. On SOT-89 this is the large center pad, tied to the die attach flag for thermal dissipation, so bond to a copper pour for heat-sinking.
3 VIN power_in Unregulated DC input. Absolute maximum 35 V (for 12-15 V output variants). Recommended input decoupling capacitor 0.33 µF placed close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • L78L12ABUTR
  • L78L12ACUTR
  • L78L12ABZ
  • L78L12ACZ
  • L78L12ABZ-AP
  • L78L12ACZ-AP
  • L78L12ACZ-TR
  • L78L12ABD-TR
  • L78L12ACD13TR
  • L78L12CD13TR

CAD (KiCad official)

  • Symbol: L78L12ABUTR
  • 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
l78l12abutr.step 57 KB You want the bare part, or you mark your own boards.
l78l12abutr-etched.step 1.4 MB You want the part with L78L12ABUTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 377 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