BL3085A

{
  "schema_version": 1,
  "type": "component",
  "slug": "bl3085a",
  "title": "BL3085A",
  "brief": "BL Shanghai Belling RS-485 / RS-422 ICs, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "bl3085a"
  ],
  "component": {
    "mpn": "BL3085A",
    "manufacturer": "BL Shanghai Belling",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/992ac6d51295381c321ebd0b3382a5bf.pdf",
    "parts": {
      "symbol": "bl3085a.kicad_sym",
      "footprint": "bl3085a.kicad_mod",
      "model_3d": "bl3085a-etched.glb",
      "model_3d_plain": "bl3085a.glb",
      "model_3d_step": "bl3085a-etched.step",
      "model_3d_step_plain": "bl3085a.step",
      "lbr": "bl3085a.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "RO",
        "type": "output",
        "description": "Receiver Output. CMOS output driven from the differential A/B receiver comparator. High-Z when the receiver is disabled (/RE=1). VOH >= 4.0V at IO=8mA (5V), VOL <= 0.4V at IO=8mA."
      },
      {
        "number": "2",
        "name": "/RE",
        "type": "input",
        "description": "Receiver Output Enable (active low). /RE=0 enables the receiver; /RE=1 disables (RO High-Z). With /RE=1 and DE=0 the device enters shutdown mode (ICC <= 10 uA)."
      },
      {
        "number": "3",
        "name": "DE",
        "type": "input",
        "description": "Driver Output Enable (active high). DE=1 enables the differential driver on A/B; DE=0 places A/B in High-Z. With /RE=1 and DE=0 the device enters shutdown mode."
      },
      {
        "number": "4",
        "name": "DI",
        "type": "input",
        "description": "Driver Input. CMOS logic input driving the differential A/B outputs when DE=1 (DI=1 -> A=high, B=low). Input hysteresis typ. 100 mV; VIH >= 2.0V, VIL <= 0.8V."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device. All voltages are referred to this pin."
      },
      {
        "number": "6",
        "name": "A",
        "type": "bidirectional",
        "description": "Non-inverting receiver input and non-inverting driver output (RS-485 bus line A). Withstands +/-13V bus voltage; receiver input resistance >= 96 kOhm (1/8 unit load). Differential threshold VTH between -200 mV and -50 mV."
      },
      {
        "number": "7",
        "name": "B",
        "type": "bidirectional",
        "description": "Inverting receiver input and inverting driver output (RS-485 bus line B). Withstands +/-13V bus voltage; +/-15 kV IEC 61000-4-2 contact ESD protection."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply input. Operating range +3.0V to +3.6V (3.3V option) or +4.5V to +5.5V (5V option); absolute max +7V. Typical ICC ~350 uA (5V) / ~270 uA (3.3V), shutdown ICC <= 10 uA. Bypass with 0.1 uF to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/992ac6d51295381c321ebd0b3382a5bf.pdf",
        "pages": 11,
        "sha256": "c911764fb5bb997a",
        "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "bl3085a.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": "bl3085a-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": "7442eaeddb017cf937db80c193830b208edb4a00fec8d0e0faee36af70860403",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "BL Shanghai Belling",
      "Package": "SOP-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bl3085a"
  ],
  "discovery_pitch": "BL3085A (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",
    "bl3085a.kicad_sym",
    "bl3085a.kicad_mod",
    "bl3085a.glb",
    "bl3085a.step",
    "bl3085a-etched.step",
    "bl3085a.lbr",
    "docs/hero.png",
    "docs/bl3085a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "BL3085A(H)",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T17:50:05.476Z"
}