SIT3490EESA

{
  "schema_version": 1,
  "type": "component",
  "slug": "sit3490eesa",
  "title": "SIT3490EESA",
  "brief": "SIT 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",
    "sit3490eesa"
  ],
  "component": {
    "mpn": "SIT3490EESA",
    "manufacturer": "SIT",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/3a5b42474f2c1948c8d3ae81b740c29e.pdf",
    "parts": {
      "symbol": "sit3490eesa.kicad_sym",
      "footprint": "sit3490eesa.kicad_mod",
      "model_3d": "sit3490eesa-etched.glb",
      "model_3d_plain": "sit3490eesa.glb",
      "model_3d_step": "sit3490eesa-etched.step",
      "model_3d_step_plain": "sit3490eesa.step",
      "lbr": "sit3490eesa.lbr"
    },
    "distributor_links": {
      "lcsc": "C496618"
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input. Operating range 3.0V to 5.5V (absolute max +7V). Typical supply current ICC = 240µA (max 400µA). Bypass locally to GND."
      },
      {
        "number": "2",
        "name": "RO",
        "type": "output",
        "description": "Receiver output (CMOS logic). RO is high when A−B ≥ +200mV and low when A−B ≤ −200mV. VOH ≥ VCC−1.5V at −4mA; VOL ≤ 0.4V at +4mA."
      },
      {
        "number": "3",
        "name": "DI",
        "type": "input",
        "description": "Driver input (CMOS logic). A low on DI forces Y low and Z high; a high on DI forces Y high and Z low. VIH ≥ 2.0V, VIL ≤ 0.8V, input leakage ±2µA."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground. Reference for all voltages on the part."
      },
      {
        "number": "5",
        "name": "Y",
        "type": "output",
        "description": "Non-inverting differential driver output to the RS-485/RS-422 bus. Differential swing VOD ≥ 1.5V into RL = 54Ω. ±15kV HBM ESD protected. Includes short-circuit and over-voltage protection."
      },
      {
        "number": "6",
        "name": "Z",
        "type": "output",
        "description": "Inverting differential driver output to the RS-485/RS-422 bus. Complementary to Y. ±15kV HBM ESD protected; short-circuit and over-voltage protected."
      },
      {
        "number": "7",
        "name": "B",
        "type": "input",
        "description": "Inverting differential receiver input from the RS-485/RS-422 bus. 1/8 unit-load, RIN ≈ 96kΩ. Common-mode range −7V to +12V. ±15kV HBM ESD."
      },
      {
        "number": "8",
        "name": "A",
        "type": "input",
        "description": "Non-inverting differential receiver input from the RS-485/RS-422 bus. 1/8 unit-load, RIN ≈ 96kΩ. Common-mode range −7V to +12V. ±15kV HBM ESD."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/3a5b42474f2c1948c8d3ae81b740c29e.pdf",
        "pages": 13,
        "sha256": "4e2651818bcb1ad0",
        "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": "sit3490eesa.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": "sit3490eesa-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": "a12cdbcaa1de9fc466ed31c7606801418c3ffc5a9583a75cb43c9531f3060f58",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "SIT",
      "Package": "SOP-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sit3490eesa"
  ],
  "discovery_pitch": "SIT3490EESA (SIT) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sit3490eesa.kicad_sym",
    "sit3490eesa.kicad_mod",
    "sit3490eesa.glb",
    "sit3490eesa.step",
    "sit3490eesa-etched.step",
    "sit3490eesa.lbr",
    "docs/hero.png",
    "docs/sit3490eesa-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "SIT3490EESA",
      "kind": "packaging"
    },
    {
      "mpn": "SIT3490EESAEEPA",
      "kind": "packaging"
    },
    {
      "mpn": "SIT3490EESAEEUA",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T06:04:19.156Z"
}