BL3085N from BL Shanghai Belling, in a SOIC-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 the recovered logic-level data from the A/B bus differential pair; enters High-Z when /RE is high.
2	/RE	input	Active-low receiver output enable. When /RE is low the receiver output RO is active; when /RE is high RO is High-Z. With /RE=high and DE=low the device enters shutdown mode.
3	DE	input	Driver output enable (active high). When DE is high the differential driver A/B outputs are enabled; when DE is low the driver outputs are High-Z.
4	DI	input	Driver input. TTL/CMOS logic input whose state drives the differential A/B bus outputs when DE is asserted. Input hysteresis is 100 mV typ.
5	GND	power_in	Device ground reference (0 V).
6	A	bidirectional	RS-485 differential bus pin A. Non-inverting receiver input and non-inverting driver output in the default polarity state; internal polarity-correction circuit may swap the A/B role after the 80 ms polarity-detection window. Absolute-max input range -7 V to +12 V; ±15 kV IEC 61000-4-2 contact-discharge ESD protected.
7	B	bidirectional	RS-485 differential bus pin B. Inverting receiver input and inverting driver output in the default polarity state; internal polarity-correction circuit may swap the A/B role after the 80 ms polarity-detection window. Absolute-max input range -7 V to +12 V; ±15 kV IEC 61000-4-2 contact-discharge ESD protected.
8	VCC	power_in	Positive supply, +5 V nominal (4.5 V to 5.5 V operating). Absolute maximum +7 V. Recommend a local 0.1 µF decoupling capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOIC-8
Category	Interface
Pins	8

Ordering variants

Same part, different packaging or reel option.

BL3085NI56

CAD (KiCad official)

Symbol: BL3085N
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: BL Shanghai Belling datasheet (9 pp, sha256 f13f3d0e939aad3d, 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