SK2485 from Suntek, 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. When /RE is low, RO is high if (A-B) >= -50 mV and low if (A-B) <= -200 mV. High-Z when /RE is high. VOH >= VCC-1V at IO=-8mA; VOL <= 0.4V at IO=8mA.
2	/RE	input	Receiver Output Enable (active low). Drive low to enable RO; RO is high impedance when /RE is high. Driving /RE high with DE low enters low-power shutdown mode (ISHDN typ 3 uA).
3	DE	input	Driver Output Enable (active high). Drive DE high to enable driver outputs A and B; outputs are high-Z when DE is low. Drive /RE high and DE low to enter low-power shutdown mode.
4	DI	input	Driver Input. With DE high, a low on DI forces the noninverting output (A) low and the inverting output (B) high. VIH >= 2.0V (5V VCC) or 1.5V (3V VCC); VIL <= 0.8V (5V) or 0.6V (3V). Typical 100 mV input hysteresis.
5	GND	power_in	Ground reference for the device.
6	A	bidirectional	Noninverting Receiver Input and Noninverting Driver Output (RS-485 bus line A). Tolerates -7 V to +12 V common-mode. Receiver input resistance >= 96 kOhm (1/8 unit load). Driver output withstands ±13 V.
7	B	bidirectional	Inverting Receiver Input and Inverting Driver Output (RS-485 bus line B). Tolerates -7 V to +12 V common-mode. Receiver input resistance >= 96 kOhm (1/8 unit load). Driver output withstands ±13 V.
8	VCC	power_in	Positive supply input. Operating range +3.0 V to +5.5 V (recommended 5 V; 3 V compatible). Absolute maximum +7 V. Supply current typ 700 uA (5V); shutdown current typ 3 uA.

Key specifications

Parameter	Value
Manufacturer	Suntek
Package	SOP-8
Category	Comm/UART
Pins	8

CAD (KiCad official)

Symbol: SK2485
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
`sk2485.step`	122 KB	You want the bare part, or you mark your own boards.
`sk2485-etched.step`	1.7 MB	You want the part with `SK2485` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 410 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: Suntek datasheet (8 pp, sha256 e452e2aa043750ad, 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