component
LM431AIM3X
Public Unreviewedby Ray
Texas Instruments Voltage Reference, SOT-23-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM431AIM3X
Texas Instruments · Voltage Reference · SOT-23-3
LM431AIM3X from Texas Instruments, 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 / shunt current-and-output pin. Sinks the shunt current (1 mA to 100 mA recommended, 150 mA absolute maximum) from the load; voltage at this pin is regulated to the programmed VZ (VREF up to 37 V absolute maximum). Connects to the external divider whose tap drives the REF pin. |
| 2 | REF | input | Reference input for the internal error amplifier. Compares against the internal 2.495 V bandgap; typical input current 2 uA (4 uA max). Programmed by the external resistor divider between cathode and anode to set the desired cathode regulation voltage VZ = VREF x (1 + R1/R2). |
| 3 | ANODE | power_in | Anode pin, normally connected to circuit ground / return. Forms the common return for the internal shunt current path and the reference divider. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| Category | PMIC |
| Pins | 3 |
Ordering variants
Same part, different packaging or reel option.
LM431AIM3XLM431AIM3XCM3XLM431AIM3XCM3LM431AIM3XCMLM431AIM3XIMXLM431AIM3XCMXLM431AIM3XIZLM431AIM3XCZLM431AIM3XILPLM431AIM3XCLP
CAD (KiCad official)
- Symbol:
LM431AIM3X - 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: Texas Instruments datasheet (38 pp, sha256
a05b3a6ffd35f165, 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).