component
LM321A-TR
Public Made by Adomby adom
3PEAK Operational Amplifier, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownLM321A-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-TRLM321A-TRSRLM321A-TRCSRLM321A-TRTSRLM321A-TRVRLM321A-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm321a-tr.step/lm321a-tr.glbare 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).