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UM3085EESA

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 um3085eesa: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
viewers um3085eesa: viewers · Ray 1mo ago
package.json Publish 0.2.0 · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 10d ago
README.md um3085eesa: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 16d ago
um3085eesa-etched.fit.json um3085eesa: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
um3085eesa-etched.glb um3085eesa: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
um3085eesa-etched.step um3085eesa: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
um3085eesa.glb Publish 0.1.0 · Ray 1mo ago
um3085eesa.kicad_mod Publish 0.1.0 · Ray 1mo ago
um3085eesa.kicad_sym Publish 0.1.0 · Ray 1mo ago
um3085eesa.lbr Publish 0.1.0 · Ray 1mo ago
um3085eesa.step Publish 0.1.0 · Ray 1mo ago

UM3085EESA

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

UM3085EESA 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. If A-B > -50 mV, RO is high; if A-B < -200 mV, RO is low. High-Z in shutdown mode.
2 ~{RE} input Receiver Output Enable (active low). Drive RE low to enable the receiver (RO active); RO is high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode.
3 DE input Driver Enable (active high). Drive DE high to enable the driver outputs (A, B); outputs are high impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode.
4 DI input Driver Input. A low on DI forces output A low and output B high; a high on DI forces output A high and output B low. Has 100 mV input hysteresis on UM3085E.
5 GND power_in Ground reference (0 V).
6 A bidirectional Non-inverting Receiver Input and Non-inverting Driver Output (RS-485 differential line A). Input range -7 V to +12 V common-mode; ±15 kV HBM / IEC61000-4-2 air-gap ESD protected.
7 B bidirectional Inverting Receiver Input and Inverting Driver Output (RS-485 differential line B). Input range -7 V to +12 V common-mode; ±15 kV HBM / IEC61000-4-2 air-gap ESD protected.
8 VCC power_in Power Supply for RS-485 transceiver. Nominal +5 V ±5% (absolute max +7 V). Typical supply current 300 µA unloaded, 2 nA in shutdown.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • UM3085EESA
  • UM3088EESA
  • UM3085EEPA
  • UM3088EEPA

CAD (KiCad official)

  • Symbol: UM3085EESA
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: um3085eesa-etched.step / um3085eesa-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um3085eesa.step / um3085eesa.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
um3085eesa.step 122 KB You want the bare part, or you mark your own boards.
um3085eesa-etched.step 2.4 MB You want the part with UM3085EESA already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 578 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 (14 pp, sha256 5d1b6bed27594621, 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