component

FS431M

Public Made by Adom

by adom

FOSAN Voltage Reference, SOT-23. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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PCB Footprint

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Datasheet

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Contents

README

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FS431M

FOSAN · Voltage Reference · SOT-23

FS431M from FOSAN, in a SOT-23. 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. Compared internally against the 2.495 V bandgap reference; typically driven from an external R1/R2 divider between Cathode and Anode to program the regulation voltage. Input current ~1.8 µA typ (4 µA max).
2 K passive Cathode. Shunt regulation terminal; sinks 1-100 mA to hold VKA at the programmed voltage (up to 40 V absolute max, 36 V programmable). Dynamic impedance 0.27 Ω typ.
3 A passive Anode. Common/ground return for the shunt regulator; the resistor divider low side and Vref return are referenced here.

Key specifications

Parameter Value
Manufacturer FOSAN
Package SOT-23
Category PMIC
Pins 3

CAD (KiCad official)

  • Symbol: FS431M
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: fs431m-etched.step / fs431m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); fs431m.step / fs431m.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
fs431m.step 59 KB You want the bare part, or you mark your own boards.
fs431m-etched.step 1.1 MB You want the part with FS431M already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 288 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: FOSAN datasheet (4 pp, sha256 44eae1ca9d167d08, 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