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LM431BIM3X

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by Ray

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

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Contents

README

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LM431BIM3X

Texas Instruments · Voltage Reference · SOT-23

LM431BIM3X from Texas Instruments, 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/output voltage terminal. Sinks cathode current (1 mA to 100 mA recommended, 150 mA absolute max) to regulate the cathode-anode voltage to the value programmed on the Reference pin. Absolute max cathode voltage 37 V.
2 REFERENCE input Reference (feedback) pin for programming the adjustable output voltage. Internal comparator drives the cathode to hold this pin at VREF = 2.495 V (typ) relative to Anode. Reference input current is 2 uA typ (4 uA max); max input voltage 10 mA / -0.5 V min.
3 ANODE power_in Anode pin, normally grounded (common reference for VREF and cathode-anode voltage). Return path for cathode shunt current.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LM431BIM3X
  • LM431BIM3XCIM3X
  • LM431BIM3XCIM3
  • LM431BIM3XAIM3X
  • LM431BIM3XAIM3
  • LM431BIM3XM
  • LM431BIM3XILP
  • LM431BIM3XLP
  • LM431BIM3XCLP

CAD (KiCad official)

  • Symbol: LM431BIM3X
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Texas Instruments datasheet (37 pp, sha256 e2f47504f27ca98e, retrieved 2026-08-17, tier: manufacturer)
  • 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