ADM485ARZ 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. CMOS logic output driven from the A/B differential inputs. Outputs logic HIGH when (A-B) >= +0.2V, LOW when (A-B) <= -0.2V, and HIGH when the differential inputs are open (fail-safe). Goes to high-impedance when RE is HIGH. VOH >= 3.5V @ -4mA, VOL <= 0.4V @ 4mA.
2	RE	input	Receiver Output Enable, active LOW. When LOW the receiver output RO is enabled; when HIGH RO is placed in high-impedance (three-state). CMOS-compatible input, VIH >= 2V, VIL <= 0.8V, IIN <= +/-2 uA.
3	DE	input	Driver Output Enable, active HIGH. When HIGH the differential driver outputs A and B are enabled; when LOW they are placed in high-impedance (three-state). CMOS-compatible input, VIH >= 2V, VIL <= 0.8V, IIN <= +/-2 uA.
4	DI	input	Driver Input. CMOS logic input; a HIGH on DI drives A HIGH and B LOW, a LOW on DI drives A LOW and B HIGH (when DE is HIGH). VIH >= 2V, VIL <= 0.8V, IIN <= +/-2 uA.
5	GND	power_in	Ground reference (0V) for all signals and the supply.
6	A	bidirectional	Non-inverting differential bus I/O. Driver non-inverting output when DE is HIGH; receiver non-inverting input when DE is LOW. Common-mode range -7V to +12V, input resistance >= 12 kOhm, driver differential output >= 1.5V into 27 Ohm (RS-485).
7	B	bidirectional	Inverting differential bus I/O. Driver inverting output when DE is HIGH; receiver inverting input when DE is LOW. Common-mode range -7V to +12V, input resistance >= 12 kOhm.
8	VCC	power_in	Positive supply input, +5V nominal (4.75V to 5.25V). Supply current typ. 1 mA (outputs enabled), 0.6 mA (outputs disabled), 2.2 mA max.

Key specifications

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

Ordering variants

ADM485ARZ

CAD (KiCad official)

Symbol: ADM485ARZ
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
`adm485arz.step`	122 KB	You want the bare part, or you mark your own boards.
`adm485arz-etched.step`	1.8 MB	You want the part with `ADM485ARZ` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 465 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 (9 pp, sha256 9d70c6bbd515fd15, 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