component

KIA431AF-RTF

Public Made by Adom

by adom

KEC Semicon 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 kia431af-rtf: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
kia431af-rtf-etched.fit.json kia431af-rtf: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
kia431af-rtf-etched.glb kia431af-rtf: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
kia431af-rtf-etched.step kia431af-rtf: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
kia431af-rtf.glb Publish 0.1.0 · Ray 1mo ago
kia431af-rtf.kicad_mod Publish 0.1.0 · Ray 1mo ago
kia431af-rtf.kicad_sym Publish 0.1.0 · Ray 1mo ago
kia431af-rtf.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect and oval pad as a SQUARE EAGLE smd; this carries the real pad shape across (0 -> 2 rounded pads) and stops dropping geometry drawn on KiCad User.N layers. Attributes, connects, pads and the pin-1 marker are gated against decreasing and are unchanged. · Ray 1mo ago
kia431af-rtf.step Publish 0.1.0 · Ray 1mo ago
package.json Publish 0.2.0 · Ray 1mo ago
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 11d ago
README.md kia431af-rtf: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 17d ago

KIA431AF-RTF

KEC Semicon · Voltage Reference · SOT-89-3

KIA431AF-RTF from KEC Semicon, 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 REF input Reference input. High-impedance input to the internal error amplifier that is compared against the 2.495 V bandgap. Typically tied to the tap of an external R1/R2 divider from cathode to anode to program Vka = Vref x (1 + R1/R2) + Iref x R1. Input current 1.8 uA typ, 4.0 uA max at 25 C.
2 A power_in Anode. Common/ground-side terminal of the shunt regulator; the internal reference and error amp are referenced to this pin. For SOT-89 the heat sink tab is electrically common to pin 2 (Anode).
3 K power_in Cathode. Regulated shunt output; sinks current through an external series resistor from the supply to hold Vka at the programmed value. Absolute max Vka = 37 V; continuous cathode current range -100 to +150 mA; minimum cathode current for regulation 0.5 mA typ (1.0 mA max).

Key specifications

Parameter Value
Manufacturer KEC Semicon
Package SOT-89-3
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • KIA431AF-RTFF
  • KIA431AF-RTFZF
  • KIA431AF-RTF
  • KIA431AF-RTFBF
  • KIA431AF-RTF(blank)
  • KIA431AF-RTFZ
  • KIA431AF-RTFA
  • KIA431AF-RTFB
  • KIA431AF-RTFM
  • KIA431AF-RTFZM
  • KIA431AF-RTFAM
  • KIA431AF-RTFBM

CAD (KiCad official)

  • Symbol: KIA431AF-RTF
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: kia431af-rtf-etched.step / kia431af-rtf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); kia431af-rtf.step / kia431af-rtf.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
kia431af-rtf.step 57 KB You want the bare part, or you mark your own boards.
kia431af-rtf-etched.step 1.3 MB You want the part with KIA431AF-RTF already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 371 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: KEC Semicon datasheet (7 pp, sha256 b0b1ac14e62a5a3f, 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