HT3485ARZ from HTCSEMI, 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-level output driven from the differential receiver comparing A vs B (threshold ±0.2 V). High-Z (OFF state) when RE is deasserted (high).
2	RE	input	Receiver output enable pin (active-low, /RE). Drive low to enable the receiver output RO; drive high to place RO in the high-impedance state. With RE high and DE low the part enters shutdown mode.
3	DE	input	Driver (transmitter) output enable pin (active-high). Drive high to enable the differential driver outputs A/B; drive low to tri-state (OFF state) the driver outputs.
4	DI	input	Transmitter (driver) input. CMOS logic-level input that sets the differential state of the A/B bus lines when DE is high. VIL ≤ 0.8 V, VIH ≥ 2.0 V.
5	GND	power_in	Ground / common reference pin (0 V). Return for supply current and reference for all logic-level inputs and outputs.
6	A	bidirectional	Non-inverting (uncomplemented) RS-485/RS-422 differential I/O line. Serves as driver output when DE=H and as receiver input when RE=L. Withstands -7 V to +12 V bus voltage.
7	B	bidirectional	Inverting (complemented, /B) RS-485/RS-422 differential I/O line. Serves as driver output when DE=H and as receiver input when RE=L. Withstands -7 V to +12 V bus voltage.
8	VCC	power_in	Positive supply pin. Recommended operating range 3.0-3.6 V (absolute max 7.0 V). Decouple to GND with a local bypass capacitor.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

HT3485ARZ

CAD (KiCad official)

Symbol: HT3485ARZ
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
`ht3485arz.step`	122 KB	You want the bare part, or you mark your own boards.
`ht3485arz-etched.step`	1.9 MB	You want the part with `HT3485ARZ` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 485 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: HTCSEMI datasheet (11 pp, sha256 7ee4385f61d7225d, 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