RS8559XQ from Jiangsu RUNIC Tech, in a TSSOP-14. 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 output swing; short-circuit current ~48 mA typ.
2	-IN A	input	Amplifier A inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V; input bias current 50 pA typ.
3	+IN A	input	Amplifier A non-inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V.
4	V+	power_in	Positive supply rail. Operating range +2.7 V to +5.5 V (absolute maximum V+ to V- = 7.0 V). Bypass with 0.1 µF close to the pin.
5	+IN B	input	Amplifier B non-inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V.
6	-IN B	input	Amplifier B inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V.
7	OUT B	output	Amplifier B output. Rail-to-rail output swing.
8	OUT C	output	Amplifier C output. Rail-to-rail output swing.
9	-IN C	input	Amplifier C inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V.
10	+IN C	input	Amplifier C non-inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V.
11	V-	power_in	Negative supply rail. Ground in single-supply operation, or negative rail in dual-supply operation (down to -2.75 V).
12	+IN D	input	Amplifier D non-inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V.
13	-IN D	input	Amplifier D inverting input. Rail-to-rail input range from (V-) - 0.2 V to (V+) + 0.2 V.
14	OUT D	output	Amplifier D output. Rail-to-rail output swing.

Key specifications

Parameter	Value
Manufacturer	Jiangsu RUNIC Tech
Package	TSSOP-14
Category	Op-amp/Cmp
Pins	14

Ordering variants

Same part, different packaging or reel option.

RS8559XQ
RS8559XQXP
RS8559XP

CAD (KiCad official)

Symbol: RS8559XQ
Footprint: Package_SO:TSSOP-14_4.4x5mm_P0.65mm
3D model: TSSOP-14 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Jiangsu RUNIC Tech datasheet (13 pp, sha256 c9d7ae209903208c, 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