ST485BDR

{
  "schema_version": 1,
  "type": "component",
  "slug": "st485bdr",
  "title": "ST485BDR",
  "brief": "STMicroelectronics RS-485 / RS-422 ICs, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "st485bdr"
  ],
  "component": {
    "mpn": "ST485BDR",
    "manufacturer": "STMicroelectronics",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://www.st.com/resource/en/datasheet/st485bdr.pdf",
    "parts": {
      "symbol": "st485bdr.kicad_sym",
      "footprint": "st485bdr.kicad_mod",
      "model_3d": "st485bdr-etched.glb",
      "model_3d_plain": "st485bdr.glb",
      "model_3d_step": "st485bdr-etched.step",
      "model_3d_step_plain": "st485bdr.step",
      "lbr": "st485bdr.lbr"
    },
    "distributor_links": {
      "lcsc": "C91197"
    },
    "pins": [
      {
        "number": "1",
        "name": "RO",
        "type": "output",
        "description": "Receiver output. CMOS-level logic output that reflects the differential polarity of A vs B; high when (A-B) >= +0.2 V, low when (A-B) <= -0.2 V. High-impedance (tri-state) when RE is high. VOH >= 3.5 V at IO = -4 mA; VOL <= 0.4 V at IO = 4 mA."
      },
      {
        "number": "2",
        "name": "RE",
        "type": "input",
        "description": "Receiver output enable (active-low). Drive low to enable the receiver output RO; drive high to place RO in high-impedance state. Input high >= 2.0 V, input low <= 0.8 V; input leakage ±2 µA."
      },
      {
        "number": "3",
        "name": "DE",
        "type": "input",
        "description": "Driver output enable (active-high). Drive high to enable the differential driver outputs A/B; drive low to place A and B in high-impedance state (disables driver, allowing bus sharing). Input high >= 2.0 V, input low <= 0.8 V."
      },
      {
        "number": "4",
        "name": "DI",
        "type": "input",
        "description": "Driver input. CMOS-level TTL-compatible logic input; when DE is high, DI high forces A high and B low, DI low forces A low and B high. Input high >= 2.0 V, input low <= 0.8 V; leakage ±2 µA."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground / 0 V reference for the device."
      },
      {
        "number": "6",
        "name": "A",
        "type": "bidirectional",
        "description": "Non-inverting differential bus pin: non-inverting receiver input and non-inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ."
      },
      {
        "number": "7",
        "name": "B",
        "type": "bidirectional",
        "description": "Inverting differential bus pin: inverting receiver input and inverting driver output. Tolerates -7 V to +12 V common-mode; ±14 V absolute maximum. Receiver input impedance >= 24 kΩ."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. Nominal 5 V ± 5 % (single supply). Absolute maximum 7 V. Quiescent supply current 300 µA typ. (unloaded, driver disabled)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/st485bdr.pdf",
        "pages": 19,
        "sha256": "16bf6365fefdf622",
        "source_tier": "mfr"
      },
      "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": "st485bdr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "st485bdr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "26233b28bfec25b0fa4eee406975ca47061dbf497ce2d4a83fa41d379f9f05cf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "SOIC-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "st485bdr"
  ],
  "discovery_pitch": "ST485BDR (STMicroelectronics) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "st485bdr.kicad_sym",
    "st485bdr.kicad_mod",
    "st485bdr.glb",
    "st485bdr.step",
    "st485bdr-etched.step",
    "st485bdr.lbr",
    "docs/hero.png",
    "docs/st485bdr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "ST485BDR",
      "kind": "packaging"
    },
    {
      "mpn": "ST485BDRCDR",
      "kind": "packaging"
    },
    {
      "mpn": "ST485BDRBN",
      "kind": "packaging"
    },
    {
      "mpn": "ST485BDRCN",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T08:25:56.212Z"
}