SIT3491EESD

{
  "schema_version": 1,
  "type": "component",
  "slug": "sit3491eesd",
  "title": "SIT3491EESD",
  "brief": "SIT RS-485 / RS-422 ICs, SOP-14. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "sit3491eesd"
  ],
  "component": {
    "mpn": "SIT3491EESD",
    "manufacturer": "SIT",
    "package": "SOP-14",
    "pin_count": 14,
    "category": "Interface",
    "subcategory": "RS-485 / RS-422 ICs",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884854876749824",
    "parts": {
      "symbol": "sit3491eesd.kicad_sym",
      "footprint": "sit3491eesd.kicad_mod",
      "model_3d": "sit3491eesd-etched.glb",
      "model_3d_plain": "sit3491eesd.glb",
      "model_3d_step": "sit3491eesd-etched.step",
      "model_3d_step_plain": "sit3491eesd.step",
      "lbr": "sit3491eesd.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. Leave floating."
      },
      {
        "number": "2",
        "name": "RO",
        "type": "output",
        "description": "Receiver output. When /RE is low: RO = H if A-B >= -10mV, RO = L if A-B <= -200mV. CMOS logic-level output referenced to VCC/GND."
      },
      {
        "number": "3",
        "name": "/RE",
        "type": "input",
        "description": "Receiver output enable, active low. /RE = L enables the receiver (RO active); /RE = H puts RO in high-impedance. /RE = H together with DE = L puts the device into low-power shutdown."
      },
      {
        "number": "4",
        "name": "DE",
        "type": "input",
        "description": "Driver output enable, active high. DE = H enables the driver (Y/Z active); DE = L puts Y/Z in high-impedance. /RE = H together with DE = L puts the device into low-power shutdown."
      },
      {
        "number": "5",
        "name": "DI",
        "type": "input",
        "description": "Driver input. DI = L drives Y low and Z high; DI = H drives Y high and Z low. CMOS logic input; VIH >= 2.0V, VIL <= 0.8V."
      },
      {
        "number": "6",
        "name": "GND",
        "type": "power_in",
        "description": "Ground return. Tie to system ground; both GND pins (6 and 7) must be connected."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground return. Tie to system ground; both GND pins (6 and 7) must be connected."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection. Leave floating."
      },
      {
        "number": "9",
        "name": "Y",
        "type": "output",
        "description": "Driver non-inverting (in-phase) differential output to the RS-485/RS-422 bus. High-impedance when DE = L. ±15kV HBM ESD protected."
      },
      {
        "number": "10",
        "name": "Z",
        "type": "output",
        "description": "Driver inverting (anti-phase) differential output to the RS-485/RS-422 bus. High-impedance when DE = L. ±15kV HBM ESD protected."
      },
      {
        "number": "11",
        "name": "B",
        "type": "input",
        "description": "Receiver inverting differential input from the RS-485/RS-422 bus. Common-mode range -7V to +12V; RIN(min) = 96 kΩ (1/8 unit load). ±15kV HBM ESD protected."
      },
      {
        "number": "12",
        "name": "A",
        "type": "input",
        "description": "Receiver non-inverting differential input from the RS-485/RS-422 bus. Common-mode range -7V to +12V; RIN(min) = 96 kΩ (1/8 unit load). ±15kV HBM ESD protected."
      },
      {
        "number": "13",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage pin. May be tied to VCC (3V ≤ VCC ≤ 5.5V) together with pin 14, or left unconnected. Bypass with a 0.1 μF ceramic capacitor to GND when connected."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Primary supply pin, 3V ≤ VCC ≤ 5.5V. Bypass with a 0.1 μF ceramic capacitor to GND. Absolute max VCC = +7V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884854876749824",
        "pages": 12,
        "sha256": "c171fa9cb090a1ee",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "sit3491eesd.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          8.7,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sit3491eesd-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3186df2ee141d7ced824c32b82652814ef1b0fbe68aa02a840a8a17394ad1612",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "SIT",
      "Package": "SOP-14",
      "Category": "Interface",
      "Pins": "14"
    }
  },
  "variants": [
    {
      "mpn": "SIT3491EESD",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sit3491eesd"
  ],
  "discovery_pitch": "SIT3491EESD (SIT) 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",
    "sit3491eesd.kicad_sym",
    "sit3491eesd.kicad_mod",
    "sit3491eesd.glb",
    "sit3491eesd.step",
    "sit3491eesd.lbr",
    "docs/hero.png",
    "docs/sit3491eesd-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T06:04:35.324Z"
}