NSI8221N1-DSPR from NOVOSENSE, in a SOP-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	VDD1	power_in	Power supply for isolator side 1. Operating range 2.5 V to 5.5 V referenced to GND1. Bypass to GND1 with a low-ESR ceramic capacitor placed close to the pin.
2	OUTA	output	Logic output of channel A on isolator side 1. Receives the digital signal transmitted across the isolation barrier from INA on side 2. CMOS output referenced to VDD1/GND1.
3	INB	input	Logic input of channel B on isolator side 1. Drives the digital signal transmitted across the isolation barrier to OUTB on side 2. CMOS input referenced to VDD1/GND1.
4	GND1	power_in	Ground reference for isolator side 1. Return for VDD1, OUTA, and INB.
5	GND2	power_in	Ground reference for isolator side 2. Return for VDD2, INA, and OUTB. Isolated from GND1 by the internal capacitive barrier.
6	OUTB	output	Logic output of channel B on isolator side 2. Receives the digital signal transmitted across the isolation barrier from INB on side 1. CMOS output referenced to VDD2/GND2.
7	INA	input	Logic input of channel A on isolator side 2. Drives the digital signal transmitted across the isolation barrier to OUTA on side 1. CMOS input referenced to VDD2/GND2.
8	VDD2	power_in	Power supply for isolator side 2. Operating range 2.5 V to 5.5 V referenced to GND2. Bypass to GND2 with a low-ESR ceramic capacitor placed close to the pin.

Key specifications

Parameter	Value
Manufacturer	NOVOSENSE
Package	SOP-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

NSi8221N1-DSPR
NSi8221W1-DSWVR
NSi8221W1-DSWR
NSi8221W1-DSWWR

CAD (KiCad official)

Symbol: NSI8221N1-DSPR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`nsi8221n1-dspr.step`	122 KB	You want the bare part, or you mark your own boards.
`nsi8221n1-dspr-etched.step`	2.7 MB	You want the part with `NSI8221N1-DSPR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 660 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: NOVOSENSE datasheet (41 pp, sha256 6c904c0e109fd57e, 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