LMV321-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 analog input. Rail-to-rail capable with common-mode range extending 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). Input bias current 1pA typical.
2	VSS	power_in	Negative supply / ground. Tie to ground for single-supply operation (2.1V to 5.5V referenced to VDD) or to the negative rail for dual-supply operation (±1.05V to ±2.75V).
3	IN-	input	Inverting analog input. Rail-to-rail capable with common-mode range extending 100mV beyond the supply rails. Input offset voltage 3.5mV max at 25°C.
4	OUT	output	Amplifier output. Rail-to-rail swing (typically within 5mV of the rails at RL>100kΩ, 30mV at 10kΩ). Sources 84mA / sinks 75mA typical short-circuit current.
5	VDD	power_in	Positive supply, 2.1V to 5.5V (absolute max 7.5V VDD-VSS). Bypass with a 0.1μF ceramic capacitor placed 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.

LMV321-TR
LMV321-TRSR

CAD (KiCad official)

Symbol: LMV321-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
`lmv321-tr.step`	85 KB	You want the bare part, or you mark your own boards.
`lmv321-tr-etched.step`	1.3 MB	You want the part with `LMV321-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 350 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 3e4d4c64aa5067d2, 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