WS742128M-10 from WILLSEMI(Will Semicon), in a MSOP-10. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	-INR	input	Right-channel negative input; with RIN and RFB the voltage gain is RFB/RIN, with gain range ±1 V/V to ±10 V/V set by external resistors.
2	OUTR	output	Right-channel output; it can drive up to 220 pF directly, and higher capacitive loads require a series resistor of 47 Ω or larger.
3	EN	input	Active-high enable input with VIH of 1.1 V minimum and VIL of 0.4 V maximum; keep it low during supply ramp-up and ramp-down for pop-free power-up.
4	PVSS	power_in	Negative supply pin generated by the charge pump; its storage capacitor should be at least equal to the charge-pump capacitor, with a typical value of 1 µF.
5	CN	passive	Charge-pump flying capacitor negative terminal; a low-ESR X5R or X7R capacitor with a typical value of 0.33 µF is recommended.
6	CP	passive	Charge-pump flying capacitor positive terminal; a low-ESR X5R or X7R capacitor with a typical value of 0.33 µF is recommended.
7	PVDD	power_in	Positive supply pin; the single supply voltage range is 3.0 V to 5.5 V, with decoupling of 0.1 µF and 10 µF placed close to the pin.
8	UVP	input	External under-voltage protection input; the internal threshold VUVP is 1.14 V to 1.31 V (1.21 V typical), with a 4.7 µA hysteresis current, and the output is muted when the supply falls below the set level.
9	OUTL	output	Left-channel output; it can drive up to 220 pF directly, and higher capacitive loads require a series resistor of 47 Ω or larger.
10	-INL	input	Left-channel negative input; with RIN and RFB the voltage gain is RFB/RIN, with gain range ±1 V/V to ±10 V/V set by external resistors.

Key specifications

Parameter	Value
Manufacturer	WILLSEMI(Will Semicon)
Package	MSOP-10
Category	Amplifiers
Pins	10

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply Voltage	VDD	3	5	5.5	V	* full operating temperature range	3
Operating Temperature Range	TA	-40		85	°C	* full operating temperature range	3
Output Offset Voltage	Vos	-3.5	0.6	3.5	mV	VDD=3V to 5V, input grounded, unity gain; * full operating temperature range	3
External under-voltage detection	VUVP	1.14	1.21	1.31	V	VDD=3.3V	3
External under-voltage detection	VUVP	1.14	1.21	1.31	V	VDD=5V	4
Maximum output current	IO			30	mA	VDD=3.3V	3
Maximum output current	IO			60	mA	VDD=5V	4
Supply Voltage	VDD			6	V		2
Input Differential Voltage	VIDR			6	V		2
Operating Free-Air Temperature Range	TA	-40		85	°C		2
Storage Temperature Range	TSTG	-65		150	°C		2
Junction Temperature Range	TJ			150	°C		2
Lead Temperature Range	TL			260	°C		2
Thermal resistance, junction to ambient	ΘJA		190		°C/W	MSOP-10 package	2

CAD (KiCad official)

Symbol: WS742128M-10
Footprint: Package_SO:MSOP-10_3x3mm_P0.5mm
3D model: MSOP-10 (KiCad packages3D, STEP)
3D model files: ws742128m-10-etched.step / ws742128m-10-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ws742128m-10.step / ws742128m-10.glb are the bare package body.

Provenance

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

Datasheet: WILLSEMI(Will Semicon) datasheet (13 pp, sha256 426e3c066f094f53, retrieved 2026-10-30, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

WS742128M-10

Verified WS742128M-10

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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