component

LR78L09A

Public Made by Adom

by adom

LRC Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89. 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 lr78l09a: 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
lr78l09a-etched.fit.json lr78l09a: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lr78l09a-etched.glb lr78l09a: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lr78l09a-etched.step lr78l09a: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lr78l09a.glb Publish 0.1.0 · Ray
lr78l09a.kicad_mod Publish 0.1.0 · Ray
lr78l09a.kicad_sym Publish 0.1.0 · Ray
lr78l09a.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
lr78l09a.step Publish 0.1.0 · Ray
package.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · 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 lr78l09a: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md lr78l09a: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

LR78L09A

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

LR78L09A from LRC, 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. Typical 9.0 V (min 8.64 V, max 9.36 V at Tj=25°C). Supplies up to 100 mA. A 0.1 µF bypass capacitor to GND close to the pin is recommended for stability and transient response.
2 GND power_in Ground / common return. On SOT-89 this pin is electrically tied to the large center tab used as the thermal pad.
3 Vin power_in Unregulated input voltage. Absolute max 30 V for the 9 V option; recommended range 11.5 V to 24 V. Dropout ~1.7 V typical. A 0.33 µF bypass capacitor to GND close to the pin is recommended.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LR78L09A
  • LR78L09B

CAD (KiCad official)

  • Symbol: LR78L09A
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: lr78l09a-etched.step / lr78l09a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr78l09a.step / lr78l09a.glb are the bare package body.

Provenance

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

  • Datasheet: LRC datasheet (8 pp, sha256 e540f0f8c27d9693, 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