component

LM321-TR

Public Made by Adom

by adom

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

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

LM321-TR

Gainsil · Operational Amplifier · SOT-23-5

LM321-TR from Gainsil, 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. Common-mode input range: -0.1V to (VDD-1.5V). Input bias current typically 45nA.
2 VSS power_in Negative supply / ground. Connect to GND for single-supply operation (+3V to +28V on VDD) or to the negative rail (down to -14V) for dual-supply operation.
3 IN- input Inverting input of the op-amp. Common-mode input range: -0.1V to (VDD-1.5V). Input bias current typically 45nA.
4 OUT output Op-amp output. Output current up to ±40mA typical (60mA max). VOH ≥ 11V and VOL ≤ 20mV with RL = 2kΩ at VS = +14V.
5 VDD power_in Positive supply pin. Operating range 3V to 28V single-supply (or up to +14V in dual-supply). Bypass to VSS with a 0.1µF ceramic capacitor close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LM321-TR
  • LM321-TRLM358-SR
  • LM321-TRLM358-MR
  • LM324-SR

CAD (KiCad official)

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

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm321-tr.step 85 KB You want the bare part, or you mark your own boards.
lm321-tr-etched.step 1.3 MB You want the part with LM321-TR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 334 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: Gainsil datasheet (12 pp, sha256 e614f8c2e1c0a60b, 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