component

LR431AD

Public Unreviewed

by Ray

LRC Voltage Reference, SOP-8. 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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LR431AD

LRC · Voltage Reference · SOP-8

LR431AD from LRC, in a SOP-8. 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 CATHODE passive Cathode (K) terminal of the programmable shunt reference. Sinks current from the regulated node; VKA range Vref to 36V, IKA 1 to 100 mA in regulation.
2 ANODE passive Anode (A) terminal. Common/ground return of the shunt reference. Internally tied to pins 3, 6, and 7.
3 ANODE passive Anode (A) terminal (duplicate). Internally tied to pins 2, 6, and 7.
4 NC unconnected No connection. Leave floating or tie per board convention.
5 NC unconnected No connection. Leave floating or tie per board convention.
6 ANODE passive Anode (A) terminal (duplicate). Internally tied to pins 2, 3, and 7.
7 ANODE passive Anode (A) terminal (duplicate). Internally tied to pins 2, 3, and 6.
8 REF input Reference (R) input. High-impedance sense pin compared internally to Vref (~2.5V). Connect to the R1/R2 divider tap: VKA = Vref*(1+R1/R2) + Iref*R1. Iref typ 1 µA, max 2 µA.

Key specifications

Parameter Value
Manufacturer LRC
Package SOP-8
Category PMIC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • LR431AD
  • LR431BD

CAD (KiCad official)

  • Symbol: LR431AD
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lr431ad.step 122 KB You want the bare part, or you mark your own boards.
lr431ad-etched.step 1.4 MB You want the part with LR431AD already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 372 faces against 147 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 (5 pp, sha256 b9b9dfe306698679, 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