component

LM321MFX

Public Made by Adom

by adom

Texas Instruments Operational Amplifier, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

componentop-amp-cmplm321mfx
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs lm321mfx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
lm321mfx-etched.fit.json lm321mfx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm321mfx-etched.glb lm321mfx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm321mfx-etched.step lm321mfx: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm321mfx.glb Publish 0.1.0 · Ray
lm321mfx.kicad_mod Publish 0.1.0 · Ray
lm321mfx.kicad_sym Publish 0.1.0 · Ray
lm321mfx.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
lm321mfx.step Publish 0.1.0 · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json lm321mfx: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md lm321mfx: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

LM321MFX

Texas Instruments · Operational Amplifier · SOT-23-5

LM321MFX from Texas Instruments, in a SOT-23-5. 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 +IN input Non-inverting input of the op-amp. Input common-mode range includes ground; either input may go up to +32 V without damage.
2 V- power_in Negative supply / ground. In single-supply operation, tie to GND. Total supply voltage (V+ - V-) must not exceed 32 V.
3 -IN input Inverting input of the op-amp. Input common-mode range includes ground; either input may go up to +32 V without damage.
4 OUTPUT output Op-amp output. Sources up to ~40 mA and sinks up to ~20 mA. Short-circuit protected to GND (continuous when V+ ≤ 15 V, TA = 25°C). Stable with high capacitive loads.
5 V+ power_in Positive supply. Operating range +3 V to +30 V (absolute max 32 V). Supply current typically 430 µA at 5 V, no load.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23-5
Category Op-amp/Cmp
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LM321MFX

CAD (KiCad official)

  • Symbol: LM321MFX
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lm321mfx-etched.step / lm321mfx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm321mfx.step / lm321mfx.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm321mfx.step 85 KB You want the bare part, or you mark your own boards.
lm321mfx-etched.step 1.3 MB You want the part with LM321MFX already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 339 faces against 102 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 (16 pp, sha256 9c21ba387dae8e4b, 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