TS391ILT from STMicroelectronics, 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	OUT	output	Comparator push-pull output. Drives high when V(IN+) > V(IN-), low otherwise. Rail-to-rail push-pull CMOS output.
2	V-	power_in	Negative supply / ground. Connect to GND for single-supply operation, or to negative rail for dual-supply operation. V+ − V- range: 2.7 V to 16 V.
3	IN+	input	Non-inverting comparator input. Rail-to-rail input common-mode range (V- to V+).
4	IN-	input	Inverting comparator input. Rail-to-rail input common-mode range (V- to V+).
5	V+	power_in	Positive supply. Single-supply range 2.7 V to 16 V, or ±1.35 V to ±8 V dual supply. Typical quiescent current 9 µA.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

TS391ILT

CAD (KiCad official)

Symbol: TS391ILT
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
`ts391ilt.step`	85 KB	You want the bare part, or you mark your own boards.
`ts391ilt-etched.step`	1.5 MB	You want the part with `TS391ILT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 365 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: STMicroelectronics datasheet (14 pp, sha256 5535252141921784, 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