LM1881N

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm1881n",
  "title": "LM1881N",
  "brief": "HGSEMI Interface - Specialized, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "communication interface chip-uart-485-232",
    "lm1881n",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LM1881N",
    "manufacturer": "HGSEMI",
    "package": "DIP-8",
    "pin_count": 8,
    "category": "Communication Interface Chip/UART/485/232",
    "subcategory": "Interface - Specialized",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/1505440e471a1312f4bd67af4eb1a435.pdf",
    "parts": {
      "symbol": "lm1881n.kicad_sym",
      "footprint": "lm1881n.kicad_mod",
      "model_3d": "lm1881n-hero.glb",
      "model_3d_plain": "lm1881n-etched.glb",
      "model_3d_step": "lm1881n-etched.step",
      "model_3d_step_plain": "lm1881n.step",
      "lbr": "lm1881n.lbr"
    },
    "distributor_links": {
      "lcsc": "C518923",
      "digikey": "2156-LM1881N-TI-ND",
      "mouser": "926-LM1881N"
    },
    "distributor_check": {
      "checked_at": "2026-10-29T01:41:33Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2156-LM1881N-TI-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "926-LM1881N",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "COMPOSITE SYNC OUTPUT",
        "type": "output",
        "description": "Composite sync output, a reproduction of the sync waveform with video removed; max output sink current 5 mA."
      },
      {
        "number": "2",
        "name": "COMPOSITE VIDEO INPUT",
        "type": "input",
        "description": "AC-coupled composite video input via a 0.1 µF capacitor, clamped to 1.5 V DC at sync tip, accepting 0.5 V to 2 V p-p."
      },
      {
        "number": "3",
        "name": "VERTICAL SYNC OUTPUT",
        "type": "output",
        "description": "Vertical sync output pulse; max output sink current 5 mA."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground connection."
      },
      {
        "number": "5",
        "name": "BURST/BACK PORCH OUTPUT",
        "type": "output",
        "description": "Burst gate/back porch pulse output, about 4 µs wide; max output sink current 5 mA."
      },
      {
        "number": "6",
        "name": "RSET",
        "type": "passive",
        "description": "Connect the RSET resistor (680 kΩ typical) to ground, with a 0.1 µF decoupling capacitor, to set internal current levels; reference voltage 1.10 V to 1.35 V."
      },
      {
        "number": "7",
        "name": "ODD/EVEN OUTPUT",
        "type": "output",
        "description": "Odd/even field index output, low during even field and high during odd field; max output sink current 2 mA."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage 5 V to 12 V DC, with a decoupling capacitor; absolute maximum 13.2 V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 17,
        "cost_usd": 0.212,
        "at": "2026-10-29T01:41:20"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/1505440e471a1312f4bd67af4eb1a435.pdf",
        "pages": 17,
        "sha256": "18a032033306f1df",
        "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"
    },
    "models_3d": [
      {
        "file": "lm1881n.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
        "checked": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm1881n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "a031735f15041c2176adb0b2ebdfcae30a8b93aab5f97e4f24b3623974905087",
        "checked": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "DIP-8",
      "Category": "Communication Interface Chip/UART/485/232",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "18a032033306f1df3059c215b012e1ccd441402fc51d572f69a727f1ad84ca92",
      "rows": [
        {
          "name": "Supply Current (outputs at logic 1)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 5.2,
          "max": 10,
          "conditions": "VCC = 5V; outputs at logic 1",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Supply Current (outputs at logic 1)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 5.5,
          "max": 12,
          "conditions": "VCC = 12V; outputs at logic 1",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "DC Input Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.3,
          "typ": 1.5,
          "max": 1.8,
          "conditions": "Pin 2",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Threshold Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": 55,
          "typ": 70,
          "max": 85,
          "conditions": "Note 6",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Discharge Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": 6,
          "typ": 11,
          "max": 16,
          "conditions": "Pin 2; VIN = 2V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Input Clamp Charge Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.2,
          "max": 0.8,
          "conditions": "Pin 2; VIN = 1V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "RSET Pin Reference Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.1,
          "typ": 1.22,
          "max": 1.35,
          "conditions": "Pin 6; Note 7",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Composite Sync & Vertical Outputs Logic 1 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 4,
          "typ": 4.5,
          "max": null,
          "conditions": "IOUT = 40 µA; VCC = 5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Composite Sync & Vertical Outputs Logic 1 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 11,
          "typ": null,
          "max": null,
          "conditions": "IOUT = 40 µA; VCC = 12V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Composite Sync & Vertical Outputs Logic 1 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": 3.6,
          "max": null,
          "conditions": "IOUT = 1.6 mA; VCC = 5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Composite Sync & Vertical Outputs Logic 1 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 10,
          "typ": null,
          "max": null,
          "conditions": "IOUT = 1.6 mA; VCC = 12V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Burst Gate & Odd/Even Outputs Logic 1 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 4,
          "typ": 4.5,
          "max": null,
          "conditions": "IOUT = 40 µA; VCC = 5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Burst Gate & Odd/Even Outputs Logic 1 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 11,
          "typ": null,
          "max": null,
          "conditions": "IOUT = 40 µA; VCC = 12V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Composite Sync Output Logic 0 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.2,
          "max": 0.8,
          "conditions": "IOUT = −1.6 mA; Pin 1",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Vertical Sync Output Logic 0 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.2,
          "max": 0.8,
          "conditions": "IOUT = −1.6 mA; Pin 3",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Burst Gate Output Logic 0 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.2,
          "max": 0.8,
          "conditions": "IOUT = −1.6 mA; Pin 5",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Odd/Even Output Logic 0 voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.2,
          "max": 0.8,
          "conditions": "IOUT = −1.6 mA; Pin 7",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Vertical Sync Width",
          "symbol": "",
          "kind": "electrical",
          "unit": "µs",
          "min": 190,
          "typ": 230,
          "max": 300,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Burst Gate Width",
          "symbol": "",
          "kind": "electrical",
          "unit": "µs",
          "min": 2.5,
          "typ": 4,
          "max": 4.7,
          "conditions": "2.7 kΩ from Pin 5 to VCC",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Vertical Default Time",
          "symbol": "",
          "kind": "electrical",
          "unit": "µs",
          "min": 32,
          "typ": 65,
          "max": 90,
          "conditions": "Note 8",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 13.2,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "Vp-p",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "VCC = 5V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "Vp-p",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "VCC = 8V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Output Sink Current",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "Pins 1, 3, 5",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Output Sink Current",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "Pin 7",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Package Dissipation",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 1100,
          "conditions": "Note 2",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "ESD Susceptibility (Human Body Model)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "kV",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "Note 3; 100 pF through 1.5 kΩ",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "ESD Susceptibility (Machine Model)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "Note 4; 220–240 pF through all pins",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Soldering Temperature, Dual-In-Line Package",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "10 s",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Lead Temperature (Soldering)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "10 s",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "Note 2 (derating basis)",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance, Junction to Ambient",
          "symbol": "",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 110,
          "conditions": "Note 2; derate above 25°C ambient",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage (operating)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 5,
          "typ": null,
          "max": 12,
          "conditions": "Single supply; Application Notes text",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Composite Video Input Amplitude (operating)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "Vp-p",
          "min": 0.5,
          "typ": null,
          "max": 2,
          "conditions": "Positive-polarity composite video; Application Notes text",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "lm1881n"
  ],
  "discovery_pitch": "LM1881N (HGSEMI) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm1881n.kicad_sym",
    "lm1881n.kicad_mod",
    "lm1881n.glb",
    "lm1881n.step",
    "lm1881n.lbr",
    "docs/hero.png",
    "docs/lm1881n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm1881n-hero.glb",
    "lm1881n-hero.overlay.json",
    "lm1881n-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}