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L78L09ACUTR

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by Ray

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

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

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L78L09ACUTR

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

L78L09ACUTR from STMicroelectronics, in a SOT-89. 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. Delivers up to 100 mA. Requires a 0.1 µF ceramic output capacitor to ground for stability. Internally current-limited and thermally protected.
2 GND power_in Ground / common reference for both input and output. On SOT-89 the ground pin is the center lead and also bonded to the heat-spreader tab on the underside for thermal dissipation.
3 VIN power_in Unregulated DC input voltage. For 9 V output the recommended VI is ~14 V (typ. dropout ~1.7 V, absolute max VI = 30 V for VO ≤ 9 V). A 0.33 µF input capacitor to GND is required when the regulator is located far from the supply filter.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • L78L09ACUTR
  • L78L09ACUTRZ
  • L78L09ACUTRAZ
  • L78L09ACUTRACZ
  • L78L09ACUTRAP
  • L78L09ACUTRABZ
  • L78L09ACUTRD
  • L78L09ACUTRD-TR
  • L78L09ACUTRABD
  • L78L09ACUTRABD-TR

CAD (KiCad official)

  • Symbol: L78L09ACUTR
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (45 pp, sha256 43922ae159face7e, 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