GS8042-MR from Gainsil, in a MSOP-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 output swing to within ~50mV of supply rails at light loads (>50kΩ). Output source/sink current ~20mA into 10Ω to Vs/2.
2	INA-	input	Amplifier A inverting input. Rail-to-rail input; common-mode range Vss-0.1V to Vdd+0.1V. Input bias current ~1pA typical.
3	INA+	input	Amplifier A non-inverting input. Rail-to-rail input; common-mode range Vss-0.1V to Vdd+0.1V. Input bias current ~1pA typical.
4	VSS	power_in	Negative supply / ground pin. In single-supply operation, connect to GND. Total supply Vdd-Vss range 1.4V to 5.5V (absolute max 7.5V).
5	INB+	input	Amplifier B non-inverting input. Rail-to-rail input; common-mode range Vss-0.1V to Vdd+0.1V. Input bias current ~1pA typical.
6	INB-	input	Amplifier B inverting input. Rail-to-rail input; common-mode range Vss-0.1V to Vdd+0.1V. Input bias current ~1pA typical.
7	OUTB	output	Amplifier B output. Rail-to-rail output swing to within ~50mV of supply rails at light loads (>50kΩ). Output source/sink current ~20mA into 10Ω to Vs/2.
8	VDD	power_in	Positive supply pin. Operating range 1.4V to 5.5V (absolute max 7.5V vs Vss). Bypass with 0.1µF ceramic capacitor to Vss close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

GS8042-MR
GS8042-MRSR

CAD (KiCad official)

Symbol: GS8042-MR
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`gs8042-mr.step`	123 KB	You want the bare part, or you mark your own boards.
`gs8042-mr-etched.step`	2.2 MB	You want the part with `GS8042-MR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 528 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 (15 pp, sha256 2cfbf0f89a315340, 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