component

UM3483EESA

Public Made by Adom

by adom

Union Semiconductor 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 um3483eesa: 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 um3483eesa: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md um3483eesa: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray
um3483eesa-etched.fit.json um3483eesa: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
um3483eesa-etched.glb um3483eesa: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
um3483eesa-etched.step um3483eesa: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
um3483eesa.glb Publish 0.1.0 · Ray
um3483eesa.kicad_mod Publish 0.1.0 · Ray
um3483eesa.kicad_sym Publish 0.1.0 · Ray
um3483eesa.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
um3483eesa.step Publish 0.1.0 · Ray

UM3483EESA

Union Semiconductor · RS-485 / RS-422 ICs · SOP-8

UM3483EESA from Union Semiconductor, 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 of the RS-485 receiver. VOH ≥ VCC-1.5V at IOUT=-1.5mA; VOL ≤ 0.4V at IOUT=2.5mA. High-impedance when /RE is high; fail-safe high when inputs are open, shorted, or idle.
2 /RE input Receiver Output Enable (active low). Drive low to enable the receiver output RO; drive high to place RO in high-impedance. Combined with DE=low, forces the device into low-power shutdown (ISHDN = 1µA).
3 DE input Driver Output Enable (active high). Drive high to enable the differential driver outputs A and B; drive low to place them in high-impedance. Combined with /RE=high, forces the device into low-power shutdown.
4 DI input Driver Input. CMOS logic-level input to the RS-485 driver. VIH ≥ 2.0V, VIL ≤ 0.8V. Logic level on DI is transmitted differentially onto A/B when DE is high.
5 GND power_in Ground reference (0V) for the device.
6 A bidirectional Non-inverting differential RS-485 bus line. Driver output when DE=high, receiver input when /RE=low. Common-mode operating range -7V to +12V; ±15kV HBM / ±15kV IEC61000-4-2 air-gap / ±8kV IEC61000-4-2 contact ESD protected.
7 B bidirectional Inverting differential RS-485 bus line. Driver output when DE=high, receiver input when /RE=low. Common-mode operating range -7V to +12V; ±15kV HBM / ±15kV IEC61000-4-2 air-gap / ±8kV IEC61000-4-2 contact ESD protected.
8 VCC power_in Positive supply, +3V to +5.5V operating range (+7V absolute max). Typical operating supply current 300µA (no load). Bypass with a local decoupling capacitor to GND.

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SOP-8
Category Interface
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • UM3483EESA
  • UM3486EESA
  • UM3483EEPA
  • UM3486EEPA

CAD (KiCad official)

  • Symbol: UM3483EESA
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: um3483eesa-etched.step / um3483eesa-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um3483eesa.step / um3483eesa.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
um3483eesa.step 122 KB You want the bare part, or you mark your own boards.
um3483eesa-etched.step 2.3 MB You want the part with UM3483EESA already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 569 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: Union Semiconductor datasheet (18 pp, sha256 b365bb8b2878eac1, 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