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LR78L12A

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by Ray

LRC 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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LR78L12A

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

LR78L12A from LRC, 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 Vo power_out Regulated +12 V output (typ 12 V, 11.4-12.6 V over line/load). Sources up to 100 mA. A 0.1 µF ceramic bypass to GND close to the pin is recommended for transient response.
2 GND power_in Common ground reference for both input and output. In the SOT-89 package the GND pin is also the tab / heat-spreader used for thermal dissipation.
3 Vi power_in Unregulated input voltage, 14.5 V to 35 V (absolute max). Dropout is ~1.7 V, so Vi must remain ≥ Vo + Vd. A 0.33 µF ceramic bypass to GND close to the pin is recommended.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LR78L12A
  • LR78L12B

CAD (KiCad official)

  • Symbol: LR78L12A
  • 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
lr78l12a.step 57 KB You want the bare part, or you mark your own boards.
lr78l12a-etched.step 1.1 MB You want the part with LR78L12A already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 295 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: LRC datasheet (6 pp, sha256 a49a118b686fea89, 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