component

LM321

Public Made by Adom

by adom

Slkor SLKORMICRO Elec Operational Amplifier, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

componentop-amp-cmplm321
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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
Name Last commit message Last updated
docs lm321: 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
lm321-etched.fit.json lm321: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm321-etched.glb lm321: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm321-etched.step lm321: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm321.glb Publish 0.1.0 · Ray
lm321.kicad_mod Publish 0.1.0 · Ray
lm321.kicad_sym Publish 0.1.0 · Ray
lm321.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
lm321.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 lm321: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md lm321: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

LM321

Slkor SLKORMICRO Elec · Operational Amplifier · SOT-23-5

LM321 from Slkor SLKORMICRO Elec, 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 op-amp input. Input bias current typ. ±45 nA (max ±250 nA); common-mode input voltage range includes ground up to V+ − 1.5 V.
2 V- power_in Negative supply / ground pin. Tie to GND for single-supply operation, or to the negative rail for split-supply operation (±12 V max, 24 V total across V+ to V-).
3 -IN input Inverting op-amp input. Input offset voltage typ. ±2 mV (max ±5 mV); differential input voltage rating 24 V.
4 OUT output Op-amp output. Source current typ. 40 mA, sink current typ. 15 mA; short-circuit current to ground typ. 40 mA. Stable driving large capacitive loads.
5 V+ power_in Positive supply pin. Absolute maximum supply voltage 24 V (single) or ±12 V (split). Supply current typ. 0.5 mA at V+ = 5 V, 0.7 mA at V+ = 24 V.

Key specifications

Parameter Value
Manufacturer Slkor SLKORMICRO Elec
Package SOT-23-5
Category Op-amp/Cmp
Pins 5

CAD (KiCad official)

  • Symbol: LM321
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lm321-etched.step / lm321-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm321.step / lm321.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm321.step 85 KB You want the bare part, or you mark your own boards.
lm321-etched.step 1.0 MB You want the part with LM321 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 265 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: Slkor SLKORMICRO Elec datasheet (5 pp, sha256 6163ed0d8bef93ca, 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