component

431S

Public Made by Adom

by adom

Shenzhen Fuman Voltage Reference, SOT-23-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs 431s: 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
431s-etched.fit.json 431s: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
431s-etched.glb 431s: one-pass backfill (re-etched) · Ray
431s-etched.step 431s: one-pass backfill (re-etched) · Ray
431s-hero.glb 431s: hero from the plain model · Ray
431s-hero.overlay.json 431s: hero from the plain model · Ray
431s.glb Publish 0.1.0 · Ray
431s.kicad_mod Publish 0.1.0 · Ray
431s.kicad_sym Publish 0.1.0 · Ray
431s.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
431s.step Publish 0.1.0 · Ray
package.json Publish 0.2.2 · 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 Publish 0.2.2 · Ray
README.md 431s: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

431S

Shenzhen Fuman · Voltage Reference · SOT-23-3

431S from Shenzhen Fuman, in a SOT-23-3. 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 REF input Reference input to the internal 2.5 V bandgap comparator. Tie to the resistive divider between cathode and anode to program VKA = Vref*(1+R1/R2)+Iref*R1. Reference input current typ 0.2 µA (max 4 µA); IREF absolute range -0.05 to +10 mA.
2 A power_in Anode. Common ground/return terminal of the shunt regulator; the low side of the R1/R2 programming divider and the low side of the load.
3 K power_in Cathode. High-side terminal; sinks current from the supply through a series resistor. VKA continuous rating 40 V max, cathode current -100 to +150 mA, regulation from IK(min) ~0.05 mA up to 100 mA.

Key specifications

Parameter Value
Manufacturer Shenzhen Fuman
Package SOT-23-3
Category PMIC
Pins 3

CAD (KiCad official)

  • Symbol: 431S
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: 431s-etched.step / 431s-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 431s.step / 431s.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
431s.step 59 KB You want the bare part, or you mark your own boards.
431s-etched.step 983 KB You want the part with 431S already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 238 faces against 69 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: Shenzhen Fuman datasheet (4 pp, sha256 89e58cf6f78a06cf, 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