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BL3085N

Public Made by Adom

by adom

BL Shanghai Belling RS-485 / RS-422 ICs, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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BL3085N

BL Shanghai Belling · RS-485 / RS-422 ICs · SOIC-8

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)
  • 3D model files: bl3085n-etched.step / bl3085n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl3085n.step / bl3085n.glb are the bare package body.

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