RS358AXk from Jiangsu RUNIC Tech, in a SOIC-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, capable of sourcing up to ~130mA. Swings within 8mV of rail with RL=10kΩ and 25mV with RL=2kΩ.
2	-INA	input	Inverting input of amplifier A. Rail-to-rail input, common-mode voltage range -0.1V to +5.6V with Vs=5.5V. Ultra-low input bias current (~10pA typical).
3	+INA	input	Non-inverting input of amplifier A. Rail-to-rail input, common-mode voltage range -0.1V to +5.6V with Vs=5.5V. Ultra-low input bias current (~10pA typical).
4	V-	power_in	Negative supply pin (or ground for single-supply operation). Total supply range V+ to V- is 2.5V to 5.5V. Absolute maximum V+ to V- is 7.0V.
5	+INB	input	Non-inverting input of amplifier B. Rail-to-rail input, common-mode voltage range -0.1V to +5.6V with Vs=5.5V. Ultra-low input bias current (~10pA typical).
6	-INB	input	Inverting input of amplifier B. Rail-to-rail input, common-mode voltage range -0.1V to +5.6V with Vs=5.5V. Ultra-low input bias current (~10pA typical).
7	OUTB	output	Output of amplifier B. Rail-to-rail output, capable of sourcing up to ~130mA. Swings within 8mV of rail with RL=10kΩ and 25mV with RL=2kΩ.
8	V+	power_in	Positive supply pin. Operating supply range 2.5V to 5.5V referenced to V-. Absolute maximum V+ to V- is 7.0V. Bypass with 0.1uF close to the pin.

Key specifications

Parameter	Value
Manufacturer	Jiangsu RUNIC Tech
Package	SOIC-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

RS358AXK
RS358AXM
RS358AXQ

CAD (KiCad official)

Symbol: RS358AXk
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rs358axk.step`	122 KB	You want the bare part, or you mark your own boards.
`rs358axk-etched.step`	2.0 MB	You want the part with `RS358AXk` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 497 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: Jiangsu RUNIC Tech datasheet (10 pp, sha256 4846f1da0efeb36a, 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