SP3490EN-L from MaxLinear, 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	VCC	power_in	Positive supply. Operating range +3.00V to +3.60V (typ 3.3V). Bypass to GND with a local decoupling capacitor.
2	R	output	Receiver output. CMOS-level digital output driven from the differential receiver comparing pins A and B. Fail-safe HIGH when the A/B inputs are open. VOH = VCC-0.4V at IO=-1.5mA; VOL = 0.4V at IO=+2.5mA.
3	D	input	Driver input. CMOS logic input that determines the polarity of the differential driver outputs Y and Z. VIH = 2.0V min, VIL = 0.8V max, input current ±10µA max.
4	GND	power_in	Ground connection. Common return for supply, logic, and differential drivers/receivers.
5	Y	output	Non-inverting driver output. Half of the RS-485/RS-422 differential driver pair (Y/Z). Differential output ≥1.5V into 27Ω (RS-485) and ≥2V into 50Ω (RS-422). Withstands -7V to +12V bus common-mode.
6	Z	output	Inverting driver output. Complement of Y for the differential driver pair. Short-circuit current limited to ±250mA over -7V ≤ VO ≤ +12V.
7	B	input	Inverting receiver input. Half of the RS-485/RS-422 differential receiver pair (A/B). Differential threshold ±200mV, input resistance ≥12kΩ, common-mode range -7V to +12V.
8	A	input	Non-inverting receiver input. Half of the RS-485/RS-422 differential receiver pair. Fail-safe circuitry forces R HIGH when A/B are left open.

Key specifications

Parameter	Value
Manufacturer	MaxLinear
Package	SOIC-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SP3490EN-LCN-L
SP3490EN-LCN-L/TR
SP3490EN-L
SP3490EN-L/TR
SP3491CN-L
SP3491CN-L/TR
SP3491EN-L
SP3491EN-L/TR

CAD (KiCad official)

Symbol: SP3490EN-L
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sp3490en-l.step`	122 KB	You want the bare part, or you mark your own boards.
`sp3490en-l-etched.step`	2.0 MB	You want the part with `SP3490EN-L` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 504 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: MaxLinear datasheet (12 pp, sha256 3d8c54220a22cdb1, retrieved 2026-08-17, tier: manufacturer)
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