GS8331-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	OUT	output	Amplifier output. Rail-to-rail output stage swings to within ~5 mV of either supply rail with a 100 kΩ load and ~20 mV with 10 kΩ. Short-circuit current typ. 20 mA (source and sink).
2	VSS	power_in	Negative supply / ground. Tie to GND for single-supply operation (VDD 1.8V-5.5V) or to the negative rail for dual-supply operation (±0.9V to ±2.75V). Bypass to VDD with a 0.1 µF ceramic capacitor placed close to the pin.
3	IN+	input	Non-inverting analog input. Common-mode input range extends 100 mV beyond the supply rails (VSS-0.1V to VDD+0.1V). Absolute maximum input range is VSS-0.5V to VDD+0.5V.
4	IN-	input	Inverting analog input. Common-mode input range extends 100 mV beyond the supply rails (VSS-0.1V to VDD+0.1V). Input bias current typ. 20 pA at 25°C.
5	VDD	power_in	Positive supply. Single-supply operation from +1.8V to +5.5V (absolute max +7.5V referenced to VSS). Bypass to VSS with a 0.1 µF 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.

GS8331-TR
GS8331-CR
GS8332-SR
GS8332-MR
GS8334-SR
GS8334-TR

CAD (KiCad official)

Symbol: GS8331-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
`gs8331-tr.step`	85 KB	You want the bare part, or you mark your own boards.
`gs8331-tr-etched.step`	2.0 MB	You want the part with `GS8331-TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 480 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 (15 pp, sha256 118070d5dc462cce, 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