LM321MF from UMW, in a SOT-23-5L. Pinout and pin descriptions extracted from the 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. Input common-mode range is 0V to V+ - 1.5V. Input bias current ~45nA (out of pin, PNP input stage).
2	V-	power_in	Negative supply / ground pin. Typically tied to GND in single-supply operation. Supply voltage (V+ - V-) up to 32V absolute maximum.
3	-IN	input	Inverting input of the op-amp. Input common-mode range is 0V to V+ - 1.5V. Input bias current ~45nA (out of pin, PNP input stage).
4	OUTPUT	output	Op-amp output. Output sourcing current typ 40mA, sinking current typ 20mA (V+=15V). Output short-circuit current to GND ~40mA.
5	V+	power_in	Positive supply pin. Operating range +3V to +32V (single-supply); absolute max 32V (V+ - V-). Supply current typ 430uA at V+=5V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

LM321MF

CAD (KiCad official)

Symbol: LM321MF
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lm321mf.step`	85 KB	You want the bare part, or you mark your own boards.
`lm321mf-etched.step`	1.2 MB	You want the part with `LM321MF` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 315 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: UMW datasheet (9 pp, sha256 0a42ee731ed21976, 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