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 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