RS8552XK 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	OUT A	output	Output of amplifier A. Rail-to-rail CMOS output, short-circuit current typ. 50 mA, slew rate 2.7 V/µs, gain-bandwidth product 4.5 MHz.
2	-IN A	input	Inverting input of amplifier A. High-impedance CMOS input; input bias current typ. 50 pA; common-mode range extends 0.1 V beyond each supply rail.
3	+IN A	input	Non-inverting input of amplifier A. High-impedance CMOS input; input bias current typ. 50 pA; rail-to-rail common-mode range.
4	V-	power_in	Negative supply pin (or ground in single-supply operation). Total V+ to V- range: +2.7 V to +5.5 V (absolute max 7.0 V). Place a 0.1 µF decoupling capacitor close to the pin.
5	+IN B	input	Non-inverting input of amplifier B. High-impedance CMOS input; input bias current typ. 50 pA; rail-to-rail common-mode range.
6	-IN B	input	Inverting input of amplifier B. High-impedance CMOS input; input bias current typ. 50 pA; common-mode range extends 0.1 V beyond each supply rail.
7	OUT B	output	Output of amplifier B. Rail-to-rail CMOS output, short-circuit current typ. 50 mA, slew rate 2.7 V/µs, gain-bandwidth product 4.5 MHz.
8	V+	power_in	Positive supply pin. Total V+ to V- range: +2.7 V to +5.5 V (absolute max 7.0 V). Place a 0.1 µF decoupling capacitor 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.

RS8552XK
RS8552XM

CAD (KiCad official)

Symbol: RS8552XK
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
`rs8552xk.step`	122 KB	You want the bare part, or you mark your own boards.
`rs8552xk-etched.step`	2.1 MB	You want the part with `RS8552XK` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 502 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 (14 pp, sha256 03823b61f9fd241f, 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