GS358B-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	Output of amplifier A. Rail-to-rail output, can swing to within <5mV of the supply rails with a 100kΩ load and 30mV with a 10kΩ load. Source/sink capability ~84mA/75mA typical at Vs=5V.
2	INA-	input	Inverting input of amplifier A. Rail-to-rail input, common-mode range extends 100mV beyond the supply rails (VSS-0.1V to VDD+0.1V). Input bias current is 1pA typical.
3	INA+	input	Non-inverting input of amplifier A. Rail-to-rail input, common-mode range VSS-0.1V to VDD+0.1V. Input offset voltage 2mV typical, 5.6mV max over temperature.
4	VSS	power_in	Negative supply rail (ground in single-supply operation). Single-supply range 2.1V to 5.5V referenced from VDD; also supports dual-supply operation from ±1.05V to ±2.75V. Bypass to ground with 0.1µF ceramic close to the pin.
5	INB+	input	Non-inverting input of amplifier B. Rail-to-rail input, common-mode range VSS-0.1V to VDD+0.1V. Input bias current 1pA typical.
6	INB-	input	Inverting input of amplifier B. Rail-to-rail input, common-mode range VSS-0.1V to VDD+0.1V.
7	OUTB	output	Output of amplifier B. Rail-to-rail output; open-loop voltage gain 100dB typical with 10kΩ load, gain-bandwidth product 1MHz, slew rate 0.6V/µs.
8	VDD	power_in	Positive supply rail. Single-supply operating range 2.1V to 5.5V (absolute max VDD-VSS = 7.5V). Quiescent current 40µA per amplifier typical. Bypass with 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.

GS358B-SR
GS358B-SRMR
GS358B-SRDR
GS358B-SRFR

CAD (KiCad official)

Symbol: GS358B-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
`gs358b-sr.step`	122 KB	You want the bare part, or you mark your own boards.
`gs358b-sr-etched.step`	2.5 MB	You want the part with `GS358B-SR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 589 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 (16 pp, sha256 a76e980b3f01f21e, 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