MAX485EIM 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. With /RE low, RO is high when (A−B) ≥ +50mV and low when (A−B) ≤ −200mV. High-impedance when /RE is high.
2	/RE	input	Receiver output enable (active low). RO is enabled when /RE is low and high-impedance when /RE is high. Hot-swap capable input. With /RE=high and DE=low the device enters low-power shutdown.
3	DE	input	Driver output enable (active high). Driver outputs A/B are enabled when DE is high and high-impedance when DE is low. Hot-swap capable input. With /RE=high and DE=low the device enters low-power shutdown.
4	DI	input	Driver input. With DE high, a low on DI forces A low and B high; a high on DI forces A high and B low.
5	GND	power_in	Ground reference (0V).
6	A	bidirectional	Non-inverting receiver input and non-inverting driver output on the RS-485/RS-422 bus. Absolute range −7V to +12V; ±16kV IEC 61000-4-2 ESD protected.
7	B	bidirectional	Inverting receiver input and inverting driver output on the RS-485/RS-422 bus. Absolute range −7V to +12V; ±16kV IEC 61000-4-2 ESD protected.
8	VCC	power_in	Positive supply, 4.5V ≤ VCC ≤ 5.5V. Bypass to GND with 0.1µF.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MAX485ECM/TR
MAX485EIM/TR
MAX485ECN
MAX485EIN
MAX485ECMM/TR
MAX485EIMM/TR
MAX485ECDQ/TR
MAX485ECDQ3/TR
MAX485EIDQ/TR
MAX485EIDQ3/TR

CAD (KiCad official)

Symbol: MAX485EIM
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
`max485eim.step`	122 KB	You want the bare part, or you mark your own boards.
`max485eim-etched.step`	1.7 MB	You want the part with `MAX485EIM` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 444 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 (18 pp, sha256 0deaafe2ee86f8ed, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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