MAX3485ESA 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: RO = high if (A-B) >= 200mV, RO = low if (A-B) <= -200mV. High impedance when /RE is high.
2	/RE	input	Receiver output enable, active low. /RE low enables the receiver output RO; /RE high tri-states RO. When /RE is high and DE is low, the device enters low-power shutdown.
3	DE	input	Driver output enable, active high. DE high enables the driver outputs A/B; DE low places them in high-impedance. When /RE is high and DE is low, the device enters low-power shutdown.
4	DI	input	Driver input. When DE is high, DI low forces A low and B high; DI high forces A high and B low. TTL/CMOS logic levels (VIH >= 2V, VIL <= 0.8V).
5	GND	power_in	Ground reference for the device. Common return for VCC, logic and bus signals.
6	A	bidirectional	Non-inverting receiver input and non-inverting driver output (RS-485/RS-422 differential bus line A). Rated for -7V to +13V bus voltage; receiver input resistance >= 96k (1/8 unit load).
7	B	bidirectional	Inverting receiver input and inverting driver output (RS-485/RS-422 differential bus line B). Rated for -7V to +13V bus voltage; receiver input resistance >= 96k (1/8 unit load).
8	VCC	power_in	Positive supply, 3.0V to 3.6V nominal (3.3V typical). Absolute maximum 7V. Decouple to GND with a 0.1uF ceramic capacitor near the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

MAX3485ESA

CAD (KiCad official)

Symbol: MAX3485ESA
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
`max3485esa.step`	122 KB	You want the bare part, or you mark your own boards.
`max3485esa-etched.step`	2.1 MB	You want the part with `MAX3485ESA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 534 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 aa3ff7b2b9b7fe97, 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