SP3485EIM from HGSEMI, 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. When RE (active-low) is low and A-B >= +200 mV, RO is driven high; when A-B <= -200 mV, RO is driven low. High-impedance when receiver is disabled.
2	/RE	input	Receiver output enable (active-low). Low enables the receiver output RO; high tri-states RO. When /RE=high AND DE=low, the device enters low-power shutdown mode.
3	DE	input	Driver output enable (active-high). High enables the differential driver outputs on A and B; low tri-states them. When /RE=high AND DE=low, the device enters low-power shutdown mode.
4	DI	input	Driver input. When DE is high, a logic low on DI forces A low and B high; a logic high on DI forces A high and B low. TTL-compatible (VIH >= 2.0 V, VIL <= 0.8 V).
5	GND	power_in	Ground reference for all signals and supply.
6	A	bidirectional	Non-inverting differential bus pin. Serves as receiver non-inverting input and driver non-inverting output. Tolerates -7 V to +13 V common-mode range; ESD-protected to +/-15 kV HBM.
7	B	bidirectional	Inverting differential bus pin. Serves as receiver inverting input and driver inverting output. Tolerates -7 V to +13 V common-mode range; ESD-protected to +/-15 kV HBM.
8	VCC	power_in	Positive supply, 3.0 V to 3.6 V nominal (3.3 V typical). Absolute max +7 V. Decouple with a 100 nF ceramic capacitor to GND close to the pin.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SP3485EIM/TR
SP3485ECM/TR
SP3485EIN
SP3485ECN
SP3485EIMM/TR
SP3485ECMM/TR
SP3485EIDQ3/TR
SP3485ECDQ3/TR
SP3485EIM8/TR
SP3485ECM8/TR

CAD (KiCad official)

Symbol: SP3485EIM
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
`sp3485eim.step`	122 KB	You want the bare part, or you mark your own boards.
`sp3485eim-etched.step`	2.1 MB	You want the part with `SP3485EIM` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 518 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: HGSEMI datasheet (17 pp, sha256 c05da1a89ebea3bb, 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