MAX3485EIM 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 is low, RO is high if (A-B) >= +200 mV and low if (A-B) <= -200 mV. High-impedance when /RE is high or the device is in shutdown.
2	/RE	input	Receiver output enable, active low. Low enables RO; high tri-states RO. When /RE is high and DE is low, the device enters low-power shutdown mode.
3	DE	input	Driver output enable, active high. High enables the differential driver on A/B; low tri-states the driver. When /RE is high and DE is low the device enters low-power shutdown mode.
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. VIH >= 2.0 V, VIL <= 0.8 V (3.3 V logic).
5	GND	power_in	Ground reference for the device. Connect to the common system ground.
6	A	bidirectional	Non-inverting RS-485 bus pin: receiver non-inverting input and driver non-inverting output. Absolute input range -7 V to +13 V; ±15 kV HBM ESD.
7	B	bidirectional	Inverting RS-485 bus pin: receiver inverting input and driver inverting output. Absolute input range -7 V to +13 V; ±15 kV HBM ESD.
8	VCC	power_in	Supply pin. Operating range 3.0 V to 3.6 V (nominal 3.3 V). Bypass locally with a 0.1 µF ceramic capacitor to GND.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MAX3485EIM/TR
MAX3485ECM/TR
MAX3485EIN
MAX3485ECN
MAX3485EIMM/TR
MAX3485ECMM/TR
MAX3485EIDQ/TR
MAX3485EIDQ3/TR
MAX3485ECDQ/TR
MAX3485ECDQ3/TR
MAX3485EIM8/TR
MAX3485ECM8/TR

CAD (KiCad official)

Symbol: MAX3485EIM
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
`max3485eim.step`	122 KB	You want the bare part, or you mark your own boards.
`max3485eim-etched.step`	2.0 MB	You want the part with `MAX3485EIM` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 505 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 2c206ef20fa97d7e, 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