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lm431cim3x-tp

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

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Contents

README

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LM431CIM3X-TP

TECH PUBLIC · Voltage Reference · SOT-23

LM431CIM3X-TP from TECH PUBLIC, 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 of the shunt regulator. Sinks the regulated cathode current I_KA (1 mA minimum for regulation, up to 100 mA continuous, 150 mA absolute max). Maximum cathode voltage V_KA = 36 V. Typically tied through a series resistor R_B to the input rail; in adjustable-output mode the output node connects here and the top of the R1/R2 divider senses it.
2 REF input Reference input terminal. The internal error amplifier drives the cathode current so that V(REF) = V_REF ≈ 2.495 V (2.483-2.507 V) with respect to the anode. Reference input current I_REF ≈ 0.7 µA typ (4 µA max); reference input current range is limited to 10 mA absolute max. Connect to the tap of the external R1/R2 divider from CATHODE to ANODE to set the output voltage V_O = V_REF(1 + R1/R2) + I_REF·R1.
3 ANODE passive Anode (A) terminal of the shunt regulator; the common reference return for both the cathode current path and the REF input. All voltages in the datasheet are referenced to the anode. Normally connected to the circuit ground (or to the low side of the feedback divider).

Key specifications

Parameter Value
Manufacturer TECH PUBLIC
Package SOT-23
Category PMIC
Pins 3

Ordering variants

  • LM431CIM3X-TP

CAD (KiCad official)

  • Symbol: LM431CIM3X-TP
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: lm431cim3x-tp-etched.step / lm431cim3x-tp-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm431cim3x-tp.step / lm431cim3x-tp.glb are the bare package body.

Provenance

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

  • Datasheet: TECH PUBLIC datasheet (None pp, sha256 a676c1f18448d5ca, 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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