GS358A-SR from Gainsil, in a SOP-8. 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	OUTA	output	Amplifier A output. Rail-to-rail push-pull output capable of sourcing/sinking ~60mA into a 10Ω load and swinging within ~10mV of the rails into 100kΩ.
2	INA-	input	Amplifier A inverting input. Rail-to-rail input; common-mode range extends from Vss-0.1V to VDD+0.1V. Input bias current typ 1pA.
3	INA+	input	Amplifier A non-inverting input. Rail-to-rail input; common-mode range Vss-0.1V to VDD+0.1V.
4	VSS	power_in	Negative supply / ground for both amplifiers. In single-supply operation tie to GND; for dual-supply operation connect to the negative rail (down to -2.75V relative to VDD).
5	INB+	input	Amplifier B non-inverting input. Rail-to-rail input; common-mode range Vss-0.1V to VDD+0.1V.
6	INB-	input	Amplifier B inverting input. Rail-to-rail input; input bias current typ 1pA.
7	OUTB	output	Amplifier B output. Rail-to-rail push-pull output; sources/sinks ~60mA into 10Ω and swings within ~10mV of the rails into light loads.
8	VDD	power_in	Positive supply, +2.1V to +5.5V (absolute max VDD-VSS = 7.5V). Bypass with a 0.1µF ceramic capacitor placed close to the pin.

Key specifications

Parameter	Value
Manufacturer	Gainsil
Package	SOP-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

GS358A-SR
GS358A-MR

CAD (KiCad official)

Symbol: GS358A-SR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`gs358a-sr.step`	122 KB	You want the bare part, or you mark your own boards.
`gs358a-sr-etched.step`	2.4 MB	You want the part with `GS358A-SR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 560 faces against 147 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 (14 pp, sha256 0d1e1dff8f955618, 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