component

LM321A-TR

Public Made by Adom

by adom

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

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs lm321a-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
lm321a-tr-etched.fit.json lm321a-tr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
lm321a-tr-etched.glb lm321a-tr: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body w… · Ray
lm321a-tr-etched.step lm321a-tr: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body w… · Ray
lm321a-tr.glb Publish 0.1.0 · Ray
lm321a-tr.kicad_mod Publish 0.1.0 · Ray
lm321a-tr.kicad_sym Publish 0.1.0 · Ray
lm321a-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
lm321a-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 lm321a-tr: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body w… · Ray
README.md lm321a-tr: specified limits as data (metadata.characteristics, 48 rows from the datasheet) · Ray

LM321A-TR

3PEAK · Operational Amplifier · SOT-23-5

LM321A-TR from 3PEAK, 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 voltage range extends from (V-) to (V+)-2V, supporting operation down to the negative rail.
2 -Vs power_in Negative supply rail (V-). Typically ground in single-supply operation; supports single-supply operation from 3V up to 36V, or split-supply operation up to ±18V.
3 -IN input Inverting input of the op-amp. Typical input bias current 60pA, input offset voltage ±3mV maximum.
4 OUT output Rail-to-rail op-amp output. Output short-circuit current typ 30mA; withstands indefinite short-circuit to either rail (subject to thermal limits).
5 +Vs power_in Positive supply rail (V+). Total supply voltage (V+ - V-) from 3V to 36V (40V absolute maximum). Decouple to V- with a local bypass capacitor near the pin.

Key specifications

Parameter Value
Manufacturer 3PEAK
Package SOT-23-5
Category Op-amp/Cmp
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • LM321A-TR
  • LM321A-TRSR
  • LM321A-TRCSR
  • LM321A-TRTSR
  • LM321A-TRVR
  • LM321A-TRF1R

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply Voltage Range VS 3 36 V 5
Quiescent Current per Amplifier IQ 110 200 μA VS = 30V 5
Quiescent Current per Amplifier, Operating Range IQ 250 μA VS = 30V; Operating Range 5
Quiescent Current per Amplifier IQ 100 150 μA VS = 5V 5
Quiescent Current per Amplifier, Operating Range IQ 200 μA VS = 5V; Operating Range 5
Power Supply Rejection Ratio PSRR 85 120 dB VS = 5V to 36V 5
Power Supply Rejection Ratio, Operating Range PSRR 80 dB VS = 5V to 36V; Operating Range 5
Input Offset Voltage VOS -3 0.1 3 mV VS = 30V, VCM = 0V to 28V 5
Input Offset Voltage, Operating Range VOS -7 7 mV VS = 30V, VCM = 0V to 28V; Operating Range 5
Input Offset Voltage Drift VOS TC 7 μV/°C Operating Range 5
Input Bias Current, Operating Range IB 600 pA Operating Range 5
Different Input Current IIN 5 nA VS = 36V, VID = 36V 5
Different Input Current, Operating Range IIN 20 nA VS = 36V, VID = 36V; Operating Range 5
Open-loop Voltage Gain Av 95 110 dB 5
Open-loop Voltage Gain, Operating Range Av 90 dB Operating Range 5
Common Mode Rejection Ratio CMRR 75 120 dB VCM = 0V to 28V 5
Common Mode Rejection Ratio, Operating Range CMRR 70 90 dB VCM = 0V to 28V; Operating Range 5
Output Voltage Swing from Positive and Negative Rail 200 300 mV RLOAD = 10kΩ to VS/2 5
Output Voltage Swing from Positive and Negative Rail, Operating Range 700 mV RLOAD = 10kΩ to VS/2; Operating Range 5
Output Voltage Swing from Positive and Negative Rail 1.1 1.3 V RLOAD = 2kΩ to VS/2 5
Output Voltage Swing from Positive and Negative Rail, Operating Range 2 V RLOAD = 2kΩ to VS/2; Operating Range 5
Output Voltage Swing from Negative Rail 5 10 mV VS = 5V, RLOAD = 10kΩ to 0V 5
Output Short-Circuit Current ISC 25 30 mA 5
Output Short-Circuit Current, Operating Range ISC 15 mA Operating Range 5
Supply Voltage (+VS)-(-VS) 40 V 4
Input Current: +IN, -IN -10 10 mA Note 2 4
Operating Temperature Range -40 125 °C 4
Storage Temperature Range -65 150 °C 4
Maximum Junction Temperature 150 °C 4
Lead Temperature (Soldering) 260 °C 10 sec 4
ESD Human Body Model HBM 3 kV ANSI/ESDA/JEDEC JS-001 4
ESD Charged Device Model CDM 2 kV ANSI/ESDA/JEDEC JS-002 4
Thermal Resistance, Junction-to-Ambient θJA 250 °C/W 5-Pin SOT23 4
Thermal Resistance, Junction-to-Case θJC 81 °C/W 5-Pin SOT23 4
Input Bias Current IB 60 pA 5
Input Offset Current IOS 60 pA 5
Gain-Bandwidth Product GBW 0.9 MHz 6
Slew Rate SR 0.5 V/μs G = 1, 2V step 6
Settling Time, 0.1% tS 4 μs G = 1, 2V step 6
Settling Time, 0.01% tS 5 μs G = 1, 2V step 6
Phase Margin PM 60 ° VS = 30V, RL=1K, CL=100pF 6
Gain Margin GM 15 dB VS = 30V, RL=1K, CL=100pF 6
Channel Separation 120 dB f = 1 kHz to 20 kHz 6
Input Voltage Noise EN 3 μVRMS f = 0.1Hz to 10Hz 6
Input Voltage Noise Density eN 70 nV/√Hz f = 1kHz 6
Input Current Noise iN 3 fA/√Hz f = 1kHz 6
Total Harmonic Distortion and Noise THD+N 0.001 % f = 1kHz, G =1, RL = 10kΩ, VOUT = 6VRMS 6
Input Capacitance CIN 5 pF Differential Mode 5

CAD (KiCad official)

  • Symbol: LM321A-TR
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lm321a-tr-etched.step / lm321a-tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm321a-tr.step / lm321a-tr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm321a-tr.step 85 KB You want the bare part, or you mark your own boards.
lm321a-tr-etched.step 1.4 MB You want the part with LM321A-TR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 359 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: 3PEAK datasheet (16 pp, sha256 084c1fd820d05005, 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