SIT1021T

{
  "schema_version": 1,
  "type": "component",
  "slug": "sit1021t",
  "title": "SIT1021T",
  "brief": "SIT LIN Transceivers, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "comm-uart",
    "sit1021t"
  ],
  "component": {
    "mpn": "SIT1021T",
    "manufacturer": "SIT",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Comm/UART",
    "subcategory": "LIN Transceivers",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2202151130_SIT-SIT1021T_C2962199.pdf",
    "parts": {
      "symbol": "sit1021t.kicad_sym",
      "footprint": "sit1021t.kicad_mod",
      "model_3d": "sit1021t-etched.glb",
      "model_3d_plain": "sit1021t.glb",
      "model_3d_step": "sit1021t-etched.step",
      "model_3d_step_plain": "sit1021t.step",
      "lbr": "sit1021t.lbr"
    },
    "distributor_links": {
      "lcsc": "C2962199"
    },
    "pins": [
      {
        "number": "1",
        "name": "RXD",
        "type": "output",
        "description": "Receive data output (open-drain). Presents the LIN bus data stream to the microcontroller; high = recessive, low = dominant. Drives active LOW after a wake-up event. Requires an external pull-up. Low-level output current typ. 1.5 mA (V_RXD=0.4 V)."
      },
      {
        "number": "2",
        "name": "SLP_N",
        "type": "input",
        "description": "Sleep control input (active LOW). Controls the INH output and resets the wake-up source flag on TXD and wake-up request on RXD. Internal pull-down (140-1200 kΩ, typ. 500 kΩ) forces sleep if left floating. V_IH ≥ 2 V, V_IL ≤ 0.8 V; abs max −0.3 to +7 V."
      },
      {
        "number": "3",
        "name": "WAKE_N",
        "type": "input",
        "description": "Local wake-up input (active LOW); negative edge triggered. Internal pull-up path to VBAT; tolerates −0.3 to +42 V. If unused, tie to VBAT to prevent EMI issues. V_IH ≥ VBAT−1 V, V_IL ≤ VBAT−3.3 V."
      },
      {
        "number": "4",
        "name": "TXD",
        "type": "input",
        "description": "Transmit data input from the microcontroller; LOW drives the LIN bus dominant, HIGH recessive. Becomes an active LOW output after a local wake-up event to indicate wake-up source. Internal pull-down (140-1200 kΩ, typ. 500 kΩ) applies a safe default when unused. V_IH ≥ 2 V, V_IL ≤ 0.8 V."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for all pins. On the DFN3x3-8 (SIT1021TK) variant the exposed thermal pad is internally connected to GND and should be soldered to board ground for improved thermal dissipation."
      },
      {
        "number": "6",
        "name": "LIN",
        "type": "bidirectional",
        "description": "LIN bus line I/O. Single-wire physical bus interface, compliant with LIN 2.x / ISO 17987-4:2016 (12V) and SAE J2602. Withstands ±42 V. Internally pulled high via slave termination resistor (30 kΩ typ.) and a series diode; master applications require an external ~1 kΩ pull-up plus series diode to VBAT."
      },
      {
        "number": "7",
        "name": "VBAT",
        "type": "power_in",
        "description": "Battery supply voltage input. Operating range in automotive 12 V systems; absolute max −0.3 to +42 V. Power-on-reset thresholds: V_th(VBATL)L 3.9-4.7 V, V_th(VBATL)H 4.2-5.1 V. Typical current draw 3 µA (Sleep) / 380 µA (Normal recessive) / 1.4 mA (Normal dominant, VBAT=12 V)."
      },
      {
        "number": "8",
        "name": "INH",
        "type": "output",
        "description": "Battery-related inhibit output for controlling an external voltage regulator. Active HIGH after a wake-up event; floats in Sleep mode and is high in all other modes. Output voltage range −0.3 V to VBAT+0.3 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2202151130_SIT-SIT1021T_C2962199.pdf",
        "pages": 19,
        "sha256": "a35d31ff292b26eb",
        "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": "sit1021t.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": "sit1021t-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": "e255f14d3e4ecc792d0330441a4eecbc6ccb79bae04d2989f7c6d10304e97aab",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "SIT",
      "Package": "SOP-8",
      "Category": "Comm/UART",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sit1021t"
  ],
  "discovery_pitch": "SIT1021T (SIT) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sit1021t.kicad_sym",
    "sit1021t.kicad_mod",
    "sit1021t.glb",
    "sit1021t.step",
    "sit1021t-etched.step",
    "sit1021t.lbr",
    "docs/hero.png",
    "docs/sit1021t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "SIT1021TT",
      "kind": "packaging"
    },
    {
      "mpn": "SIT1021TTK",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T06:00:53.960Z"
}