BL3085N

{
  "schema_version": 1,
  "type": "component",
  "slug": "bl3085n",
  "title": "BL3085N",
  "brief": "BL Shanghai Belling RS-485 / RS-422 ICs, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "bl3085n"
  ],
  "component": {
    "mpn": "BL3085N",
    "manufacturer": "BL Shanghai Belling",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2108150430_BL-Shanghai-Belling-BL3085N-I56_C2885450.pdf",
    "parts": {
      "symbol": "bl3085n.kicad_sym",
      "footprint": "bl3085n.kicad_mod",
      "model_3d": "bl3085n-etched.glb",
      "model_3d_plain": "bl3085n.glb",
      "model_3d_step": "bl3085n-etched.step",
      "model_3d_step_plain": "bl3085n.step",
      "lbr": "bl3085n.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "RO",
        "type": "output",
        "description": "Receiver output. Drives the recovered logic-level data from the A/B bus differential pair; enters High-Z when /RE is high."
      },
      {
        "number": "2",
        "name": "/RE",
        "type": "input",
        "description": "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."
      },
      {
        "number": "3",
        "name": "DE",
        "type": "input",
        "description": "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."
      },
      {
        "number": "4",
        "name": "DI",
        "type": "input",
        "description": "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."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference (0 V)."
      },
      {
        "number": "6",
        "name": "A",
        "type": "bidirectional",
        "description": "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."
      },
      {
        "number": "7",
        "name": "B",
        "type": "bidirectional",
        "description": "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."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "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."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2108150430_BL-Shanghai-Belling-BL3085N-I56_C2885450.pdf",
        "pages": 9,
        "sha256": "f13f3d0e939aad3d",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "bl3085n.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bl3085n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "608debdf6bc2d9dddb7a2c1a1c6daebdf7853aa8e134135c34c73738c368b628",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "BL Shanghai Belling",
      "Package": "SOIC-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "variants": [
    {
      "mpn": "BL3085NI56",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bl3085n"
  ],
  "discovery_pitch": "BL3085N (BL Shanghai Belling) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bl3085n.kicad_sym",
    "bl3085n.kicad_mod",
    "bl3085n.glb",
    "bl3085n.step",
    "bl3085n.lbr",
    "docs/hero.png",
    "docs/bl3085n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T17:50:21.633Z"
}