SIT3485EUA from SIT, in a MSOP-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 enabled (RE low), RO outputs the logic level received from the differential bus (A-B). High-impedance when RE is high.
2	RE	input	Receiver Output Enable (active low). Drive low to enable the receiver output RO; drive high to place RO in high-impedance state.
3	DE	input	Driver Output Enable (active high). Drive high to enable the driver outputs A and B; drive low to place them in high-impedance state.
4	DI	input	Driver Input. Logic level applied here is transmitted onto the differential bus (A-B) when the driver is enabled (DE high).
5	GND	power_in	Ground reference (0 V) for the device.
6	A	bidirectional	Non-inverting differential bus I/O (RS-485/RS-422). Driver output when DE is high; receiver input otherwise. Receiver output RO is high when V(A) - V(B) > +200 mV.
7	B	bidirectional	Inverting differential bus I/O (RS-485/RS-422). Driver output when DE is high; receiver input otherwise. Receiver output RO is low when V(A) - V(B) < -200 mV.
8	VCC	power_in	Positive supply voltage input, 3.0 V to 3.6 V (typ 3.3 V). Bypass with 0.1 uF to GND close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

SIT3485EUA

CAD (KiCad official)

Symbol: SIT3485EUA
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: SIT datasheet (13 pp, sha256 5b55f1879c7f2a4b, retrieved 2026-08-17, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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