SIT3085EESA from SIT, 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: if (A - B) ≥ -50 mV, RO is high; if (A - B) ≤ -200 mV, RO is low. Drives up to
2	/RE	input	Receiver Output Enable (active-low). Drive /RE low to enable RO; RO is high-impedance when /RE is high. Drive /RE high and DE low to enter low-power shutdown mode (ISHDN ≈ 0.5 µA typ). Hot-swap tolerant. VIH ≥ 2.0 V, VIL ≤ 0.8 V.
3	DE	input	Driver Output Enable (active-high). Drive DE high to enable driver outputs on A/B; outputs are high-impedance when DE is low. Drive /RE high and DE low together to enter low-power shutdown mode. Hot-swap tolerant. VIH ≥ 2.0 V, VIL ≤ 0.8 V.
4	DI	input	Driver Input. With DE high, a low on DI forces the non-inverting output (A) low and inverting output (B) high; a high on DI forces A high and B low. VIH ≥ 2.0 V, VIL ≤ 0.8 V.
5	GND	power_in	Ground return / reference for all voltages on the device.
6	A	bidirectional	RS-485/RS-422 non-inverting Receiver Input and non-inverting Driver Output. Bus pin tolerant to -7 V to +12 V common-mode; HBM ±16 kV, IEC61000-4-2 contact discharge ±16 kV. Receiver input resistance ≥ 96 kΩ (1/8 unit load).
7	B	bidirectional	RS-485/RS-422 inverting Receiver Input and inverting Driver Output. Bus pin tolerant to -7 V to +12 V common-mode; HBM ±16 kV, IEC61000-4-2 contact discharge ±16 kV. Receiver input resistance ≥ 96 kΩ (1/8 unit load).
8	VCC	power_in	Positive Supply. Operating range 4.5 V to 5.5 V (absolute maximum +7 V). Supply current typ 180 µA (receiver enabled) / 150 µA (driver enabled); 0.5 µA typ in shutdown. Bypass to GND close to the pin.

Key specifications

Parameter	Value
Manufacturer	SIT
Package	SOP-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

SIT3085EESA

CAD (KiCad official)

Symbol: SIT3085EESA
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: SIT datasheet (18 pp, sha256 bd5a0c8a9c8a2f0e, 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