SY8745FCC

{
  "schema_version": 1,
  "type": "component",
  "slug": "sy8745fcc",
  "title": "SY8745FCC",
  "brief": "Silergy Corp LED Drivers, SOIC-8-EP. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "led-drv",
    "sy8745fcc"
  ],
  "component": {
    "mpn": "SY8745FCC",
    "manufacturer": "Silergy Corp",
    "package": "SOIC-8-EP",
    "pin_count": 9,
    "category": "LED-drv",
    "subcategory": "LED Drivers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/8b7fe0a9861e469b8b2ebe3205a13289.pdf",
    "parts": {
      "symbol": "sy8745fcc.kicad_sym",
      "footprint": "sy8745fcc.kicad_mod",
      "model_3d": "sy8745fcc-etched.glb",
      "model_3d_plain": "sy8745fcc.glb",
      "model_3d_step": "sy8745fcc-etched.step",
      "model_3d_step_plain": "sy8745fcc.step",
      "lbr": "sy8745fcc.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection. Leave floating or tie to a copper pour per layout guidance."
      },
      {
        "number": "2",
        "name": "CF",
        "type": "input",
        "description": "Dimming filter / reference capacitor pin. In analog dimming mode, connect a ~10nF capacitor to filter the reference. Also used to select the dimming mode: when VCF>1.5V the IC operates in PWM dimming mode; when VCF<1.5V it operates in analog dimming mode. Also sets soft-start time via CCF."
      },
      {
        "number": "3",
        "name": "LX",
        "type": "output",
        "description": "Switching node / inductor connection. Internal low-side power MOSFET switches this node to GND. Connect the external output inductor from the power input side to LX. Absolute maximum 63V; keep LX copper area small to reduce EMI/noise."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin. Also tied to the exposed thermal pad on the SO8E package. Provide a large copper area / ground plane for thermal and noise performance (ΘJA=30°C/W, θJC=10°C/W)."
      },
      {
        "number": "5",
        "name": "IN",
        "type": "power_in",
        "description": "Input supply pin (10-60V operating, 63V absolute max). Decouple this pin to GND with a 1µF (or larger) X7R ceramic capacitor placed close to IN/GND. Also serves as the positive terminal of the internal current sense (VIN-VSEN)."
      },
      {
        "number": "6",
        "name": "SEN",
        "type": "input",
        "description": "Negative current sense input. Connects to the LED-side of the external current sense resistor RSEN (RSEN = 0.1V / ILED). Typical current sense limit 100mV (VIN-VSEN). Recommended operating range is VIN ± 0.4V (absolute max VIN ± 0.6V)."
      },
      {
        "number": "7",
        "name": "EN",
        "type": "input",
        "description": "Enable and PWM dimming input pin. EN rising threshold 1.0V, falling 0.5V. If VEN>8V the IC operates in 0~1V linear (analog) dimming mode with the dimming signal applied to CF. If VEN<8V the IC works in PWM/analog dimming on EN (add a ~10nF cap to CF). Absolute max 63V; IC shuts down ~10ms after EN goes low."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection. Leave floating or tie to a copper pour per layout guidance."
      },
      {
        "number": "EP",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal pad on the underside of the SO8E package, electrically tied to GND (pin 4). Solder to a large ground copper pour for thermal dissipation (PD=3.3W @ 25°C)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/8b7fe0a9861e469b8b2ebe3205a13289.pdf",
        "pages": 9,
        "sha256": "99a9efb6f89adc4a",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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    "models_3d": [
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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,
          1.55
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "2d6f7e774e8143e3320cbd59eb5be9f3b7864614644e3b072006e1eb05fb7fa6",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sy8745fcc-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "1ca5e9b54331ba2a36f57c46422472c8ecf8d2aa4f2452b1d6cd1765ac484cf6",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Silergy Corp",
      "Package": "SOIC-8-EP",
      "Category": "LED-drv",
      "Pins": "9"
    }
  },
  "variants": [
    {
      "mpn": "SY8745FCC",
      "kind": "packaging"
    }
  ],
  "sections": [
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    "info"
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  "discovery_triggers": [
    "sy8745fcc"
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  "discovery_pitch": "SY8745FCC (Silergy Corp) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
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    "path": "docs/hero.png"
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  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T09:16:34.599Z"
}