SSP3085 from Shanghai Siproin Microelectronics, 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	RO	tri_state	Receiver output. Drives high when A-B >= -0.05V, low when A-B <= -0.2V, and high (fail-safe) when A and B are open or shorted. High-impedance when RE is high.
2	/RE	input	Active-low receiver output enable. RO is enabled when /RE is low; RO is high-impedance when /RE is high.
3	DE	input	Driver output enable. Driver outputs A and B are enabled when DE is high; they are high-impedance when DE is low.
4	DI	input	Driver input. A low on DI forces output A low and output B high; a high on DI forces output A high and output B low.
5	GND	power_in	Ground reference (0V).
6	A	bidirectional	Non-inverting RS-485/RS-422 bus pin: receiver input and driver output. ±15kV HBM ESD protected. Absolute input voltage range -7V to +12V.
7	B	bidirectional	Inverting RS-485/RS-422 bus pin: receiver input and driver output. ±15kV HBM ESD protected. Absolute input voltage range -7V to +12V.
8	VDD	power_in	Supply voltage input, nominally +5V (±5%). Absolute maximum 6V. Bypass to GND with 0.1µF ceramic capacitor.

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	SOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SSP3085

CAD (KiCad official)

Symbol: SSP3085
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
`ssp3085.step`	122 KB	You want the bare part, or you mark your own boards.
`ssp3085-etched.step`	2.2 MB	You want the part with `SSP3085` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 517 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: Shanghai Siproin Microelectronics datasheet (11 pp, sha256 206e7ab738ff2155, 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