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L78L09ABUTR

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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L78L09ABUTR

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

L78L09ABUTR 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 +9 V output. Sources up to 100 mA with typical dropout of 1.7 V. Bypass to GND with a 0.1 µF ceramic capacitor near the pin.
2 GND power_in Common ground reference for input and output. Also the thermal path in SOT-89 (pin 2 is bonded to the die-attach tab under the package).
3 VIN power_in Unregulated positive input. Absolute maximum DC input voltage is 30 V for the 9 V version. Bypass to GND with a 0.33 µF capacitor to prevent oscillation, especially if the regulator is located far from the raw 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.

  • L78L09ABUTR
  • L78L09ABUTRAZ
  • L78L09ABUTRACZ
  • L78L09ABUTRCZ
  • L78L09ABUTRD
  • L78L09ABUTRD-TR
  • L78L09ABUTRD13TR

CAD (KiCad official)

  • Symbol: L78L09ABUTR
  • 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
l78l09abutr.step 57 KB You want the bare part, or you mark your own boards.
l78l09abutr-etched.step 1.5 MB You want the part with L78L09ABUTR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 406 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 (46 pp, sha256 aebc91bfc9b4bb67, 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