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LM431ACM3X

Public Unreviewed

by Ray

Texas Instruments 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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Datasheet

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Contents

README

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LM431ACM3X

Texas Instruments · Voltage Reference · SOT-23

LM431ACM3X 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 current to regulate the voltage between CATHODE and ANODE to whatever value forces VREF = 2.495 V. Recommended cathode voltage VREF to 37 V; cathode current 1 mA to 100 mA (absolute max 150 mA).
2 REF input Reference input pin for adjustable output voltage. Internally compared to the 2.495 V bandgap; connect to a resistor divider from CATHODE to ANODE to program the shunt voltage. Reference input current ~2 µA typ (4 µA max); absolute max reference voltage -0.5 V, reference input current 10 mA.
3 ANODE passive Anode pin, normally grounded. Return path for cathode shunt current and the reference divider.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LM431ACM3X
  • LM431ACM3XLP
  • LM431ACM3XLPM
  • LM431ACM3XLPR
  • LM431ACM3XM
  • LM431ACM3XMX

CAD (KiCad official)

  • Symbol: LM431ACM3X
  • 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
lm431acm3x.step 59 KB You want the bare part, or you mark your own boards.
lm431acm3x-etched.step 1.6 MB You want the part with LM431ACM3X already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 399 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: 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