ST3485EBDR from UMW, 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: if (A-B) >= 200 mV, RO = high; if (A-B) <= -200 mV, RO = low. High-impedance when /RE is high.
2	/RE	input	Active-low receiver output enable. /RE low enables receiver output on RO; /RE high tristates RO. With /RE high and DE low, the device enters low-power shutdown.
3	DE	input	Driver output enable. DE high enables the differential driver on A/B; DE low tristates the driver outputs. With /RE high and DE low, the device enters low-power shutdown.
4	DI	input	Driver input. With DE high, DI low forces non-inverting output A low and inverting output B high; DI high forces A high and B low.
5	GND	power_in	Ground reference for the device.
6	A	bidirectional	Non-inverting RS-485/RS-422 bus pin. Non-inverting receiver input and non-inverting driver output. Absolute maximum bus voltage -7 V to +13 V.
7	B	bidirectional	Inverting RS-485/RS-422 bus pin. Inverting receiver input and inverting driver output. Absolute maximum bus voltage -7 V to +13 V.
8	VCC	power_in	Power supply input. Operating range 3.0 V to 3.6 V (typ 3.3 V). Absolute maximum 7 V.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOP-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

ST3485EBDR

CAD (KiCad official)

Symbol: ST3485EBDR
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
`st3485ebdr.step`	122 KB	You want the bare part, or you mark your own boards.
`st3485ebdr-etched.step`	2.4 MB	You want the part with `ST3485EBDR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 582 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: UMW datasheet (17 pp, sha256 a8e8c3814e8156fa, 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