WS72042M-8 from WILLSEMI Will Semicon, 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	Op-amp A output. Rail-to-rail output; short-circuit current typ. 12-20 mA sink/source. Closed-loop output impedance ~0.7 Ω at G=1, 1 kHz.
2	-INA	input	Inverting input of op-amp A. Rail-to-rail input; input bias current <10 pA, input resistance >1 TΩ.
3	+INA	input	Non-inverting input of op-amp A. Rail-to-rail input, common-mode range (V-)-0.3 V to (V+)+0.3 V.
4	V-	power_in	Negative supply rail (or GND in single-supply operation). Total supply (V+ − V-) rated 1.6 V to 5.5 V (abs max 6 V).
5	+INB	input	Non-inverting input of op-amp B. Rail-to-rail input, common-mode range (V-)-0.3 V to (V+)+0.3 V.
6	-INB	input	Inverting input of op-amp B. Rail-to-rail input; input bias current <10 pA, input resistance >1 TΩ.
7	OUTB	output	Op-amp B output. Rail-to-rail output; short-circuit current typ. 12-20 mA sink/source. Closed-loop output impedance ~0.7 Ω at G=1, 1 kHz.
8	V+	power_in	Positive supply rail. Total supply (V+ − V-) 1.6 V to 5.5 V (abs max 6 V). Quiescent current 610 nA typ. per amplifier.

Key specifications

Parameter	Value
Manufacturer	WILLSEMI Will Semicon
Package	MSOP-8
Category	Op-amp/Cmp
Pins	8

Ordering variants

Same part, different packaging or reel option.

WS72042M-8
WS72042M-8/TR
WS72042M-8S-8
WS72042M-8S-8/TR

CAD (KiCad official)

Symbol: WS72042M-8
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: WILLSEMI Will Semicon datasheet (12 pp, sha256 a642491a6cab9d37, 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