BL3085 from BL Shanghai Belling BL3085 I47, 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. Drives logic level derived from the A-B differential input; high-Z when /RE is high. Fail-safe forces RO high when A/B are open or shorted.
2	/RE	input	Receiver output enable, active low. RO is enabled when /RE is low; RO is high-Z when /RE is high. With DE=0 and /RE=1 the device enters shutdown.
3	DE	input	Driver output enable, active high. Driver outputs A/B are enabled when DE is high; outputs are high-Z when DE is low. With DE=0 and /RE=1 the device enters shutdown.
4	DI	input	Driver input. Logic level to be transmitted onto the differential A/B bus when the driver is enabled. VIH=2.0 V min, VIL=0.8 V max, 100 mV typ hysteresis.
5	GND	power_in	Ground reference for logic and bus signals.
6	A	bidirectional	Non-inverting receiver input and non-inverting driver output (RS-485 bus line A). Withstands ±13 V bus voltage; ±15 kV IEC 61000-4-2 contact-discharge ESD protected.
7	B	bidirectional	Inverting receiver input and inverting driver output (RS-485 bus line B). Withstands ±13 V bus voltage; ±15 kV IEC 61000-4-2 contact-discharge ESD protected.
8	VCC	power_in	Supply voltage. Operates from +3.0-3.6 V or +4.5-5.5 V. Absolute maximum +7 V. Typical ICC 270-350 µA; shutdown ISHDN 10 µA max.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling BL3085 I47
Package	SOP-8
Category	Comm/UART
Pins	8

Ordering variants

BL3085I47

CAD (KiCad official)

Symbol: BL3085
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
`bl3085.step`	122 KB	You want the bare part, or you mark your own boards.
`bl3085-etched.step`	1.8 MB	You want the part with `BL3085` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 433 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: BL Shanghai Belling BL3085 I47 datasheet (10 pp, sha256 52853b49ab796e41, 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