SN65HVD78DR

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn65hvd78dr",
  "title": "SN65HVD78DR",
  "brief": "Texas Instruments 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",
    "sn65hvd78dr"
  ],
  "component": {
    "mpn": "SN65HVD78DR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn65hvd78.pdf",
    "parts": {
      "symbol": "sn65hvd78dr.kicad_sym",
      "footprint": "sn65hvd78dr.kicad_mod",
      "model_3d": "sn65hvd78dr-etched.glb",
      "model_3d_plain": "sn65hvd78dr.glb",
      "model_3d_step": "sn65hvd78dr-etched.step",
      "model_3d_step_plain": "sn65hvd78dr.step",
      "lbr": "sn65hvd78dr.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "R",
        "type": "output",
        "description": "Receive data output. CMOS-level output driven from the differential receiver comparing bus pins A and B. Output current range +/-8 mA."
      },
      {
        "number": "2",
        "name": "RE",
        "type": "input",
        "description": "Active-low receiver enable. When low, the receiver output R is enabled; when high, R is high-impedance. Tie low with DE low for standby."
      },
      {
        "number": "3",
        "name": "DE",
        "type": "input",
        "description": "Active-high driver enable. When high, the differential driver on A/B is enabled; when low, driver outputs are high-impedance."
      },
      {
        "number": "4",
        "name": "D",
        "type": "input",
        "description": "Driver data input. CMOS-level logic input driving the differential bus outputs A and B when DE is asserted. 5-V tolerant."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Local device ground / reference potential."
      },
      {
        "number": "6",
        "name": "A",
        "type": "bidirectional",
        "description": "Non-inverting RS-485 differential bus I/O. Driver output or receiver input, complementary to B. Wide common-mode range (-7 V to 12 V) and robust bus ESD."
      },
      {
        "number": "7",
        "name": "B",
        "type": "bidirectional",
        "description": "Inverting RS-485 differential bus I/O. Driver output or receiver input, complementary to A. Wide common-mode range (-7 V to 12 V) and robust bus ESD."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, 3.0 V to 3.6 V (3.3 V nominal). Bypass to GND with a local 100 nF ceramic capacitor."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn65hvd78.pdf",
        "pages": 47,
        "sha256": "b46f5803fa8302f9",
        "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"
    },
    "models_3d": [
      {
        "file": "sn65hvd78dr.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": "sn65hvd78dr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "b82c8587194610b94214fe682f70ef11f36777e8144999a792b90346cf0a9c95",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn65hvd78dr"
  ],
  "discovery_pitch": "SN65HVD78DR (Texas Instruments) 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",
    "sn65hvd78dr.kicad_sym",
    "sn65hvd78dr.kicad_mod",
    "sn65hvd78dr.glb",
    "sn65hvd78dr.step",
    "sn65hvd78dr-etched.step",
    "sn65hvd78dr.lbr",
    "docs/hero.png",
    "docs/sn65hvd78dr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "SN65HVD78DR",
      "kind": "packaging"
    },
    {
      "mpn": "SN65HVD78DRD",
      "kind": "packaging"
    },
    {
      "mpn": "SN65HVD78DRDGK",
      "kind": "packaging"
    },
    {
      "mpn": "SN65HVD78DRDGKR",
      "kind": "packaging"
    },
    {
      "mpn": "SN65HVD78DRB",
      "kind": "packaging"
    },
    {
      "mpn": "SN65HVD78DRBR",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T06:29:44.283Z"
}