SSP3485 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	output	Receiver output. Drives high when A-B ≥ -0.05 V, low when A-B ≤ -0.2 V, and high when A and B are open or shorted (fail-safe). High-Z when the receiver is disabled (RE high).
2	RE	input	Active-low receiver output enable. Receiver output RO is enabled when RE is low and is high-impedance when RE is high. TTL/CMOS input (VIH ≥ 2.0 V, VIL ≤ 0.8 V).
3	DE	input	Driver output enable. Driver outputs A and B are enabled when DE is high and are high-impedance when DE is low. TTL/CMOS input (VIH ≥ 2.0 V, VIL ≤ 0.8 V).
4	DI	input	Driver input. A low on DI forces A low and B high; a high on DI forces A high and B low (when DE is high). TTL/CMOS input with ~100 mV typical hysteresis.
5	GND	power_in	Ground reference (0 V) for the device.
6	A	bidirectional	Non-inverting RS-485/RS-422 bus pin. Receiver differential input and driver differential output. ±15 kV HBM ESD protected; withstands -7 V to +12 V common-mode; 96 kΩ minimum input resistance (1/8 unit load).
7	B	bidirectional	Inverting RS-485/RS-422 bus pin. Receiver differential input and driver differential output. ±15 kV HBM ESD protected; withstands -7 V to +12 V common-mode; 96 kΩ minimum input resistance (1/8 unit load).
8	VDD	power_in	Supply voltage input, +5 V nominal (absolute max -0.3 V to +7 V). Bypass to GND with a 0.1 µF ceramic capacitor close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SSP3485
SSP3485U

CAD (KiCad official)

Symbol: SSP3485
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
`ssp3485.step`	122 KB	You want the bare part, or you mark your own boards.
`ssp3485-etched.step`	2.1 MB	You want the part with `SSP3485` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 494 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 b727d1cfb78b48a8, 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