component

LM431BIM3

Public Unreviewed

by Ray

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

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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LM431BIM3

HGSEMI · Voltage Reference · SOT-23-3

LM431BIM3 from HGSEMI, 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 CATHODE passive Cathode (K) of the shunt regulator. Connects to the positive supply through a series resistor; regulates the K-A voltage to satisfy Vref at the REF input. Continuous cathode current range 1 mA to 150 mA; V(KA) rating 37 V max.
2 REF input Reference input to the internal error amplifier. Compared to the internal 2.495 V bandgap reference; output voltage is set by the external divider between K and A tapped into REF (V_OUT = (1 + R1/R2) * V_REF). Reference input current typ. 1.5 uA (max 4 uA).
3 ANODE passive Anode (A) of the shunt regulator, typically tied to circuit ground / low side of the divider network. Return path for cathode current.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LM431BIM3/TR
  • LM431BIM3AIM3/TR
  • LM431BIM3ACM3/TR
  • LM431BIM3BCM3/TR
  • LM431BIM3CIM3/TR
  • LM431BIM3CCM3/TR
  • LM431BIM3AIZ
  • LM431BIM3ACZ
  • LM431BIM3BIZ
  • LM431BIM3BCZ
  • LM431BIM3CIZ
  • LM431BIM3CCZ
  • LM431BIM3AIMK/TR
  • LM431BIM3ACMK/TR
  • LM431BIM3BIMK/TR
  • LM431BIM3BCMK/TR
  • LM431BIM3CIMK/TR
  • LM431BIM3CCMK/TR
  • LM431BIM3AIM/TR
  • LM431BIM3ACM/TR
  • LM431BIM3BIM/TR
  • LM431BIM3BCM/TR
  • LM431BIM3CIM/TR
  • LM431BIM3CCM/TR

CAD (KiCad official)

  • Symbol: LM431BIM3
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: HGSEMI datasheet (9 pp, sha256 7e234b72ffe30494, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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