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LR321

Public Made by Adom

by adom

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

componentop-amp-cmplr321
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs lr321: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 4d ago
viewers lr321: viewers · Ray 1mo ago
lr321-etched.fit.json lr321: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 4d ago
lr321-etched.glb lr321: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 4d ago
lr321-etched.step lr321: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 4d ago
lr321.glb Publish 0.1.0 · Ray 1mo ago
lr321.kicad_mod Publish 0.1.0 · Ray 1mo ago
lr321.kicad_sym Publish 0.1.0 · Ray 1mo ago
lr321.lbr Publish 0.1.0 · Ray 1mo ago
lr321.step Publish 0.1.0 · Ray 1mo ago
package.json Publish 0.1.0 · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 8d ago
README.md lr321: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 18d ago

LR321

LRC · Operational Amplifier · SOT-23-5

LR321 from LRC, 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. Rail-to-rail input common-mode range from (-VS - 0.1V) to (+VS + 0.1V); absolute limit (-VS) - 0.5V to (+VS) + 0.5V. Input bias current ~10pA typical.
2 -VS power_in Negative supply rail. Connect to GND for single-supply operation (2.5V-5.5V), or to a negative rail for dual-supply operation (±1.25V to ±2.75V). Absolute max V+ to V- = 7.5V.
3 -IN input Inverting input of the op-amp. Rail-to-rail input common-mode range; input bias current ~10pA typical, input offset voltage ±0.8mV typical (±5mV max).
4 OUT output Rail-to-rail output. Output swing ~8mV from rails at RL=100kΩ, ~80mV at RL=10kΩ. Short-circuit / output current capability ~23mA typ (20mA min). Can directly drive up to 250pF capacitive load in unity gain.
5 +VS power_in Positive supply rail. Operating range 2.1V to 5.5V (single-supply 2.5V-5.5V, dual-supply ±1.25V to ±2.75V). Quiescent current 60µA typical. Bypass with 0.1µF ceramic close to the pin.

Key specifications

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

CAD (KiCad official)

  • Symbol: LR321
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lr321-etched.step / lr321-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr321.step / lr321.glb are the bare package body.

Provenance

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

  • Datasheet: LRC datasheet (8 pp, sha256 ffaa7779e8ef5c9e, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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