HGX3485EIMM from HGSEMI, in a MSOP-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 and A-B >= +200 mV, RO drives high; when A-B <= -200 mV, RO drives low. High-impedance when /RE is high.
2	/RE	input	Receiver output enable, active-low. /RE low enables the receiver (RO active); /RE high puts RO into high-impedance. With /RE high AND DE low the device enters low-power shutdown mode.
3	DE	input	Driver output enable, active-high. DE high enables the differential driver on A/B; DE low places A and B in high-impedance. With /RE high AND DE low the device enters low-power shutdown mode.
4	DI	input	Driver data input. When DE is high, DI low drives A low and B high; DI high drives A high and B low. Ignored when the driver is disabled.
5	GND	power_in	Ground reference for all supply and signal pins.
6	A	bidirectional	RS-485/RS-422 non-inverting bus pin: driver non-inverting output and receiver non-inverting input. Tolerates -7 V to +13 V common-mode; input impedance >= 12 kOhm (1/8 unit load).
7	B	bidirectional	RS-485/RS-422 inverting bus pin: driver inverting output and receiver inverting input. Tolerates -7 V to +13 V common-mode; input impedance >= 12 kOhm (1/8 unit load).
8	VCC	power_in	Supply voltage input, 3.0 V to 3.6 V (nominal 3.3 V). Absolute maximum +7 V. Decouple locally to GND.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	MSOP-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

HGX3485EIMM/TR
HGX3485EIMMECMM/TR
HGX3485EIMMEIN
HGX3485EIMMECN
HGX3485EIMMEIM/TR
HGX3485EIMMECM/TR
HGX3485EIMMEIDQ/TR
HGX3485EIMMEIDQ3/TR
HGX3485EIMMECDQ/TR
HGX3485EIMMECDQ3/TR
HGX3485EIMMEIM8/TR
HGX3485EIMMECM8/TR

CAD (KiCad official)

Symbol: HGX3485EIMM
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: HGSEMI datasheet (17 pp, sha256 6236ed989891b63a, 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