component

LTL431ATLT1G

Public Unreviewed

by Ray

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

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Contents

README

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LTL431ATLT1G

LRC · Voltage Reference · SOT-23

LTL431ATLT1G from LRC, 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 Cathode (K) terminal. Sinks the regulated current when VKA >= Vref (~2.5V). Absolute maximum VKA = 36V; cathode current range -100 mA to +150 mA continuous; minimum cathode current for regulation IKA(min) typ 0.45 mA, max 1.0 mA. Dynamic impedance typ 0.15 Ω at f <= 1 kHz.
2 REF input Reference (R) input. High-impedance sense input to the internal error amplifier compared against the internal 2.5V bandgap reference (Vref typ 2.495-2.50V). Reference input current Iref typ 1.5 µA (max 4 µA) with R1 = 10 kΩ. Output is programmed via VO = (1 + R1/R2) * Vref.
3 ANODE passive Anode (A) terminal. Common/ground return for the reference; internal error amplifier and output transistor emitter reference. Typically tied to circuit ground in shunt-regulator configurations.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LTL431ATLT1GALT1G
  • LTL431ATLT1GBLT1G
  • LTL431ATLT1GAPLT1G
  • LTL431ATLT1GBPLT1G
  • LTL431ATLT1G
  • LTL431ATLT1GBTLT1G
  • LTL431ATLT1GAPTLT1G
  • LTL431ATLT1GBPTLT1G

CAD (KiCad official)

  • Symbol: LTL431ATLT1G
  • 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
ltl431atlt1g.step 59 KB You want the bare part, or you mark your own boards.
ltl431atlt1g-etched.step 1.3 MB You want the part with LTL431ATLT1G already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 365 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: LRC datasheet (5 pp, sha256 f72860759bbf8e8d, 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