RS522XK 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	Amplifier A output. Rail-to-rail push-pull CMOS output; swings within ~7mV of the rails at RL=10kOhm and delivers ~80mA short-circuit current.
2	-IN A	input	Inverting input of amplifier A. High-impedance CMOS input, IB ~1pA typical, common-mode range -0.1V to +5.6V at Vs=5.5V. Diode-clamped to the supply rails.
3	+IN A	input	Non-inverting input of amplifier A. High-impedance CMOS input, rail-to-rail common-mode range (-0.1V to Vs+0.1V). Input signals more than 0.5V beyond the rails must be current-limited to 10mA.
4	V-	power_in	Negative supply / ground. In single-supply operation tie to GND; in split-supply operation connect to the negative rail. Total supply span V+ to V- must not exceed 7.0V (absolute maximum).
5	+IN B	input	Non-inverting input of amplifier B. High-impedance CMOS input, rail-to-rail common-mode range (-0.1V to Vs+0.1V).
6	-IN B	input	Inverting input of amplifier B. High-impedance CMOS input, IB ~1pA typical.
7	OUT B	output	Amplifier B output. Rail-to-rail push-pull CMOS output; ~80mA short-circuit current, unity-gain stable driving CL=100pF.
8	V+	power_in	Positive supply. Operating range +2.5V to +5.5V referenced to V-. Bypass with a 0.1uF ceramic (and 10uF bulk) placed close to the pin per the datasheet layout guidance.

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.

RS522XK
RS522XKXM

CAD (KiCad official)

Symbol: RS522XK
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Jiangsu RUNIC Tech datasheet (14 pp, sha256 c8e86d17f4ba6f0a, 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