XL551

{
  "schema_version": 1,
  "type": "component",
  "slug": "xl551",
  "title": "XL551",
  "brief": "XINLUDA Timers / Clock Oscillators, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "xl551"
  ],
  "component": {
    "mpn": "XL551",
    "manufacturer": "XINLUDA",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Timers / Clock Oscillators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b87c2e33af7f36597b61ad7a4c42308a.pdf",
    "parts": {
      "symbol": "xl551.kicad_sym",
      "footprint": "xl551.kicad_mod",
      "model_3d": "xl551-etched.glb",
      "model_3d_plain": "xl551.glb",
      "model_3d_step": "xl551-etched.step",
      "model_3d_step_plain": "xl551.step",
      "lbr": "xl551.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference. All voltage values are with respect to network GND."
      },
      {
        "number": "2",
        "name": "TRIG",
        "type": "input",
        "description": "Trigger input. Start of timing input. When TRIG < 1/2 CONT (approximately 1/3 VDD by default), the internal flip-flop is set, driving OUT high and turning off the discharge switch."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "output",
        "description": "High-current timer output signal. VOH typ 4.8V at IOH=1mA (VDD=5V); VOL typ 0.21V at IOL=8mA. Sinks up to 100mA and sources up to 10mA typical."
      },
      {
        "number": "4",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input. When held low, forces OUT low and turns the discharge switch on, overriding all other inputs. Tie high (to VDD) when unused to prevent false triggering."
      },
      {
        "number": "5",
        "name": "CONT",
        "type": "input",
        "description": "Control voltage input. Sets comparator thresholds; nominally at 2/3 VDD (open-circuit typ 66.7% of VDD). Allows bypass capacitor connection (typically 10nF to GND) or external threshold override."
      },
      {
        "number": "6",
        "name": "THRES",
        "type": "input",
        "description": "Threshold input. End of timing input. When THRES > CONT (approximately 2/3 VDD by default), the internal flip-flop is reset, driving OUT low and turning the discharge switch on."
      },
      {
        "number": "7",
        "name": "DISCH",
        "type": "output",
        "description": "Discharge. Open-collector output used to discharge the external timing capacitor to GND when OUT is low. Provides a low-impedance path to GND during the reset/low-output state."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Power-supply voltage. Recommended operating range 2V to 15V; absolute maximum 17.5V. Typical IDD = 170uA at VDD=5V (max 350uA at 25 degC)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/b87c2e33af7f36597b61ad7a4c42308a.pdf",
        "pages": 12,
        "sha256": "8c2a047422caeea7",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
    },
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        "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": "xl551-etched.step",
        "role": "eda",
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "sha256": "9d60311f53c61823127c12b88ce55cf3947719c7b22248eb11270424f6cf0f44",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "XINLUDA",
      "Package": "SOP-8",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "variants": [
    {
      "mpn": "XL551",
      "kind": "packaging"
    },
    {
      "mpn": "XL551XD551",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "xl551"
  ],
  "discovery_pitch": "XL551 (XINLUDA) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
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    "xl551.kicad_mod",
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    "xl551.step",
    "xl551.lbr",
    "docs/hero.png",
    "docs/xl551-datasheet.pdf",
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  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T14:34:30.251Z"
}