LM321G-AE5-R from UTC Unisonic Tech, 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. Input common-mode range extends from ground (V-) to V+ - 1.5V. Input bias current is typically 45nA (out of the pin due to PNP input stage).
2	V-	power_in	Negative supply / ground. In single-supply operation this pin is tied to ground; in dual-supply operation it connects to the negative rail. Total supply (V+ - V-) is rated 3V to 32V (30V operating).
3	-IN	input	Inverting input of the op amp. Input common-mode range extends from ground (V-) to V+ - 1.5V. Input bias current is typically 45nA (out of the pin due to PNP input stage).
4	OUTPUT	output	Op amp output. Typical output swing is up to V+ - 2V with 2kΩ load. Output current sourcing up to 40mA typical; short-circuit current to ground ~40mA. Stable driving large capacitive loads.
5	V+	power_in	Positive power supply. Operating range +3V to +30V; absolute max 32V. Typical supply current is 430µA at V+ = 5V (1.15mA max) and 660µA at V+ = 30V (2.85mA max).

Key specifications

Parameter	Value
Manufacturer	UTC Unisonic Tech
Package	SOT-23-5
Category	Op-amp/Cmp
Pins	5

Ordering variants

Same part, different packaging or reel option.

LM321G-AE5-R
LM321L-AE5-R

CAD (KiCad official)

Symbol: LM321G-AE5-R
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
`lm321g-ae5-r.step`	85 KB	You want the bare part, or you mark your own boards.
`lm321g-ae5-r-etched.step`	1.8 MB	You want the part with `LM321G-AE5-R` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 468 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: UTC Unisonic Tech datasheet (7 pp, sha256 516da351bd5b42b3, retrieved 2026-08-17, tier: manufacturer)
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