component

ST485BDR

Public Made by Adom

by adom

STMicroelectronics RS-485 / RS-422 ICs, SOIC-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 st485bdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json st485bdr: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md st485bdr: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray
st485bdr-etched.fit.json st485bdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
st485bdr-etched.glb st485bdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
st485bdr-etched.step st485bdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
st485bdr.glb Publish 0.1.0 · Ray
st485bdr.kicad_mod Publish 0.1.0 · Ray
st485bdr.kicad_sym Publish 0.1.0 · Ray
st485bdr.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
st485bdr.step Publish 0.1.0 · Ray

ST485BDR

STMicroelectronics · RS-485 / RS-422 ICs · SOIC-8

ST485BDR from STMicroelectronics, in a SOIC-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-level logic output that reflects the differential polarity of A vs B; high when (A-B) >= +0.2 V, low when (A-B) <= -0.2 V. High-impedance (tri-state) when RE is high. VOH >= 3.5 V at IO = -4 mA; VOL <= 0.4 V at IO = 4 mA.
2 RE input Receiver output enable (active-low). Drive low to enable the receiver output RO; drive high to place RO in high-impedance state. Input high >= 2.0 V, input low <= 0.8 V; input leakage ±2 µA.
3 DE input Driver output enable (active-high). Drive high to enable the differential driver outputs A/B; drive low to place A and B in high-impedance state (disables driver, allowing bus sharing). Input high >= 2.0 V, input low <= 0.8 V.
4 DI input Driver input. CMOS-level TTL-compatible logic input; when DE is high, DI high forces A high and B low, DI low forces A low and B high. Input high >= 2.0 V, input low <= 0.8 V; leakage ±2 µA.
5 GND power_in Ground / 0 V reference for the device.
6 A bidirectional Non-inverting differential bus pin: non-inverting receiver input and non-inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ.
7 B bidirectional Inverting differential bus pin: inverting receiver input and inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ.
8 VCC power_in Positive supply. Nominal 5 V ± 5 % (single supply). Absolute maximum 7 V. Quiescent supply current 300 µA typ. (unloaded, driver disabled).

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOIC-8
Category Interface
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • ST485BDR
  • ST485BDRCDR
  • ST485BDRBN
  • ST485BDRCN

CAD (KiCad official)

  • Symbol: ST485BDR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: st485bdr-etched.step / st485bdr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); st485bdr.step / st485bdr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
st485bdr.step 122 KB You want the bare part, or you mark your own boards.
st485bdr-etched.step 2.0 MB You want the part with ST485BDR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 494 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: STMicroelectronics datasheet (19 pp, sha256 16bf6365fefdf622, retrieved 2026-08-17, tier: manufacturer)
  • 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