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

CAD (KiCad official)

Symbol: LM321A-TR
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

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