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RS431BYSF3

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Jiangsu RUNIC Tech 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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RS431BYSF3

Jiangsu RUNIC Tech · Voltage Reference · SOT-23

RS431BYSF3 from Jiangsu RUNIC Tech, 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 Cathode passive Shunt current/voltage input (K). Sinks 0.5 to 100mA and regulates VKA between VREF (~2.5V) and 36V according to the reference feedback.
2 Ref input Reference input (R) - threshold relative to the common Anode. Internally compared against the 2.5V bandgap; driven by an external resistor divider from Cathode to Anode to program the shunt voltage (VOUT = (1 + R1/R2) x VREF). Input current typ 1.5µA.
3 Anode passive Common anode pin (A), normally connected to ground. All device voltages are referenced to this pin.

Key specifications

Parameter Value
Manufacturer Jiangsu RUNIC Tech
Package SOT-23
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • RS431BYSF3
  • RS431AYSF3
  • RS432AYSF3
  • RS432BYSF3

CAD (KiCad official)

  • Symbol: RS431BYSF3
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
rs431bysf3.step 59 KB You want the bare part, or you mark your own boards.
rs431bysf3-etched.step 2.0 MB You want the part with RS431BYSF3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 493 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: Jiangsu RUNIC Tech datasheet (9 pp, sha256 8f8161e218eaee64, 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