component

LR78L05A

Public Made by Adom

by adom

LRC Voltage Reference, SOT-89-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs lr78l05a: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
lr78l05a-etched.fit.json lr78l05a: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lr78l05a-etched.glb lr78l05a: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lr78l05a-etched.step lr78l05a: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lr78l05a.glb Publish 0.1.0 · Ray
lr78l05a.kicad_mod Publish 0.1.0 · Ray
lr78l05a.kicad_sym Publish 0.1.0 · Ray
lr78l05a.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
lr78l05a.step Publish 0.1.0 · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json lr78l05a: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md lr78l05a: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

LR78L05A

LRC · Voltage Reference · SOT-89-3

LR78L05A 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 Vout power_out Regulated +5 V output (4.75-5.25 V over line/load). Supplies up to 100 mA. A 0.1 µF ceramic bypass capacitor to GND is recommended close to the pin for stability and transient response.
2 GND power_in Ground / common return for both input and output. On SOT-89 this pin is electrically and thermally tied to the large center tab used as the primary heat-sinking pad.
3 Vin power_in Unregulated DC input, typically 7-20 V for 5 V version (absolute max 30 V for Vo=5-9V parts). Dropout ~1.7 V. A 0.33 µF bypass capacitor to GND close to the pin is recommended when the regulator is far from the power source's filter capacitor.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LR78L05A
  • LR78L05B

CAD (KiCad official)

  • Symbol: LR78L05A
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: lr78l05a-etched.step / lr78l05a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr78l05a.step / lr78l05a.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lr78l05a.step 57 KB You want the bare part, or you mark your own boards.
lr78l05a-etched.step 1.1 MB You want the part with LR78L05A already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 311 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