component

HT3485ARZ

Public Made by Adom

by adom

HTCSEMI RS-485 / RS-422 ICs, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs ht3485arz: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
ht3485arz-etched.fit.json ht3485arz: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
ht3485arz-etched.glb ht3485arz: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
ht3485arz-etched.step ht3485arz: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
ht3485arz.glb Publish 0.1.0 · Ray 1mo ago
ht3485arz.kicad_mod Publish 0.1.0 · Ray 1mo ago
ht3485arz.kicad_sym Publish 0.1.0 · Ray 1mo ago
ht3485arz.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect and oval pad as a SQUARE EAGLE smd; this carries the real pad shape across (0 -> 8 rounded pads) and stops dropping geometry drawn on KiCad User.N layers. Attributes, connects, pads and the pin-1 marker are gated against decreasing and are unchanged. · Ray 1mo ago
ht3485arz.step Publish 0.1.0 · Ray 1mo ago
package.json Publish 0.2.0 · Ray 1mo ago
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 11d ago
README.md ht3485arz: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 17d ago

HT3485ARZ

HTCSEMI · RS-485 / RS-422 ICs · SOP-8

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 files: ht3485arz-etched.step / ht3485arz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ht3485arz.step / ht3485arz.glb are the bare package body.

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