SN65HVD1781DR

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn65hvd1781dr",
  "title": "SN65HVD1781DR",
  "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",
    "sn65hvd1781dr"
  ],
  "component": {
    "mpn": "SN65HVD1781DR",
    "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/sn65hvd1781.pdf",
    "parts": {
      "symbol": "sn65hvd1781dr.kicad_sym",
      "footprint": "sn65hvd1781dr.kicad_mod",
      "model_3d": "sn65hvd1781dr-etched.glb",
      "model_3d_plain": "sn65hvd1781dr.glb",
      "model_3d_step": "sn65hvd1781dr-etched.step",
      "model_3d_step_plain": "sn65hvd1781dr.step",
      "lbr": "sn65hvd1781dr.lbr"
    },
    "distributor_links": {
      "digikey": "296-23118-2-ND",
      "lcsc": "C42737"
    },
    "pins": [
      {
        "number": "1",
        "name": "R",
        "type": "output",
        "description": "Receiver data output. CMOS-level output presenting the demodulated state of the differential bus (A vs B). Drives up to ±8 mA (VOH ≥ 2.4 V, VOL ≤ 0.4 V)."
      },
      {
        "number": "2",
        "name": "RE",
        "type": "input",
        "description": "Receiver enable, active low. Drive low (or tie to GND) to enable the receiver output R; drive high (or tie to VCC) to place R in high-impedance. Combine with DE=low for standby/low-power mode."
      },
      {
        "number": "3",
        "name": "DE",
        "type": "input",
        "description": "Driver enable, active high. Drive high to enable the differential driver (A/B); drive low to place the driver outputs in high-impedance. Combine with RE=high for standby/low-power mode (ICC ≤ 1 µA)."
      },
      {
        "number": "4",
        "name": "D",
        "type": "input",
        "description": "Driver data input. CMOS logic input whose state (with DE=high) sets the differential polarity between bus pins A and B. VIH ≥ 2 V, VIL ≤ 0.8 V."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device. Connect to the system ground plane."
      },
      {
        "number": "6",
        "name": "A",
        "type": "bidirectional",
        "description": "Non-inverting RS-485 bus I/O. Driver output or receiver input, complementary to B. Fault-protected to ±70 V and ±16 kV HBM ESD; withstands -7 V to +12 V common-mode in normal operation."
      },
      {
        "number": "7",
        "name": "B",
        "type": "bidirectional",
        "description": "Inverting RS-485 bus I/O. Driver output or receiver input, complementary to A. Fault-protected to ±70 V and ±16 kV HBM ESD; withstands -7 V to +12 V common-mode in normal operation."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. 3.15 V to 5.5 V recommended operating range (4.5 V to 5.5 V per Pin Functions table for full RS-485 compliance). Bypass locally with a 0.1 µF ceramic capacitor to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn65hvd1781.pdf",
        "pages": 34,
        "sha256": "f8736dab94b48730",
        "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": "sn65hvd1781dr.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": "sn65hvd1781dr-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": "1c24674a328fbf72aabb9d13c264879aaf37c9e25abd5756609d0c1f669a44ed",
        "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": [
    "sn65hvd1781dr"
  ],
  "discovery_pitch": "SN65HVD1781DR (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",
    "sn65hvd1781dr.kicad_sym",
    "sn65hvd1781dr.kicad_mod",
    "sn65hvd1781dr.glb",
    "sn65hvd1781dr.step",
    "sn65hvd1781dr-etched.step",
    "sn65hvd1781dr.lbr",
    "docs/hero.png",
    "docs/sn65hvd1781dr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "SN65HVD1781DR",
      "kind": "packaging"
    },
    {
      "mpn": "SN65HVD1781DRD",
      "kind": "packaging"
    },
    {
      "mpn": "SN65HVD1781DRP",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T06:24:57.129Z"
}