MAX13085 from Shanghai Siproin Microelectronics, 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 ≥ -0.05V, RO is high; if A-B ≤ -0.2V, RO is low; if A and B are open or shorted, RO is high (fail-safe). High-impedance when /RE is high.
2	/RE	input	Receiver output enable (active low). RO is enabled when /RE is low and high-impedance when /RE is high. Driving /RE high while DE is low places the device into low-current shutdown.
3	DE	input	Driver output enable (active high). Driver outputs A and B are enabled when DE is high and are high-impedance when DE is low.
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. VIH ≥ 2.0V, VIL ≤ 0.8V.
5	GND	power_in	Ground reference for the device.
6	A	bidirectional	Non-inverting receiver input and non-inverting driver output (RS-485/RS-422 bus line A). Protected to ±15kV HBM ESD; common-mode range -7V to +12V.
7	B	bidirectional	Inverting receiver input and inverting driver output (RS-485/RS-422 bus line B). Protected to ±15kV HBM ESD; common-mode range -7V to +12V.
8	VDD	power_in	Positive supply voltage. Nominal +5V (±5%); +3.3V operation supported with maximum recommended data rate of 500kbps. Absolute maximum -0.3V to +7V.

Key specifications

Parameter	Value
Manufacturer	Shanghai Siproin Microelectronics
Package	SOP-8
Category	Comm/UART
Pins	8

Ordering variants

Same part, different packaging or reel option.

MAX13085

CAD (KiCad official)

Symbol: MAX13085
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
`max13085.step`	122 KB	You want the bare part, or you mark your own boards.
`max13085-etched.step`	1.9 MB	You want the part with `MAX13085` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 470 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: Shanghai Siproin Microelectronics datasheet (12 pp, sha256 8cef423a3a319af6, 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