NE556M

{
  "schema_version": 1,
  "type": "component",
  "slug": "ne556m",
  "title": "NE556M",
  "brief": "HGSEMI Timers / Clock Oscillators, SOP-14. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "ne556m"
  ],
  "component": {
    "mpn": "NE556M",
    "manufacturer": "HGSEMI",
    "package": "SOP-14",
    "pin_count": 14,
    "category": "RTC",
    "subcategory": "Timers / Clock Oscillators",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/f84dbffdc54ccf6bdeaea3812f7692b8.pdf",
    "parts": {
      "symbol": "ne556m.kicad_sym",
      "footprint": "ne556m.kicad_mod",
      "model_3d": "ne556m-etched.glb",
      "model_3d_plain": "ne556m.glb",
      "model_3d_step": "ne556m-etched.step",
      "model_3d_step_plain": "ne556m.step",
      "lbr": "ne556m.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "DIS1",
        "type": "output",
        "description": "Discharge pin for timer 1. Open-collector output that discharges the external timing capacitor when the internal flip-flop is in the reset state."
      },
      {
        "number": "2",
        "name": "THR1",
        "type": "input",
        "description": "Threshold input for timer 1. When the voltage on this pin exceeds 2/3 VCC, the internal flip-flop is reset, ending the timing interval."
      },
      {
        "number": "3",
        "name": "OUT1",
        "type": "output",
        "description": "Output of timer 1. Push-pull output capable of sourcing or sinking up to 200 mA; swings between near-ground and near-VCC."
      },
      {
        "number": "4",
        "name": "RST1",
        "type": "input",
        "description": "Reset input for timer 1 (active low). Pulling this pin below ~0.7V forces the output low and discharges the timing capacitor regardless of other inputs. Tie to VCC when unused."
      },
      {
        "number": "5",
        "name": "CON1",
        "type": "input",
        "description": "Control voltage input for timer 1. Allows direct access to the 2/3 VCC internal reference divider to modify timing thresholds or perform pulse-width modulation. Bypass to GND with 0.01 uF if unused."
      },
      {
        "number": "6",
        "name": "TRG1",
        "type": "input",
        "description": "Trigger input for timer 1 (active low). A negative-going pulse below 1/3 VCC starts the timing interval and drives the output high."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Common return for both timers and all internal circuitry."
      },
      {
        "number": "8",
        "name": "TRG2",
        "type": "input",
        "description": "Trigger input for timer 2 (active low). A negative-going pulse below 1/3 VCC starts the timing interval and drives the output high."
      },
      {
        "number": "9",
        "name": "CON2",
        "type": "input",
        "description": "Control voltage input for timer 2. Allows direct access to the 2/3 VCC internal reference divider to modify timing thresholds or perform pulse-width modulation. Bypass to GND with 0.01 uF if unused."
      },
      {
        "number": "10",
        "name": "RST2",
        "type": "input",
        "description": "Reset input for timer 2 (active low). Pulling this pin below ~0.7V forces the output low and discharges the timing capacitor regardless of other inputs. Tie to VCC when unused."
      },
      {
        "number": "11",
        "name": "OUT2",
        "type": "output",
        "description": "Output of timer 2. Push-pull output capable of sourcing or sinking up to 200 mA; swings between near-ground and near-VCC."
      },
      {
        "number": "12",
        "name": "THR2",
        "type": "input",
        "description": "Threshold input for timer 2. When the voltage on this pin exceeds 2/3 VCC, the internal flip-flop is reset, ending the timing interval."
      },
      {
        "number": "13",
        "name": "DIS2",
        "type": "output",
        "description": "Discharge pin for timer 2. Open-collector output that discharges the external timing capacitor when the internal flip-flop is in the reset state."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, 4.5V to 16V. Powers both internal timer sections; bypass locally with a 0.1 uF ceramic to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/f84dbffdc54ccf6bdeaea3812f7692b8.pdf",
        "pages": 9,
        "sha256": "fdee0501f2001d17",
        "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": "ne556m.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": "ne556m-etched.step",
        "role": "eda",
        "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": "4616571094534ad49a4c76b8aae9a70be03151a954819c32e77f819efc2e448e",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "SOP-14",
      "Category": "RTC",
      "Pins": "14"
    }
  },
  "variants": [
    {
      "mpn": "NE556MM",
      "kind": "packaging"
    },
    {
      "mpn": "NE556MN",
      "kind": "packaging"
    },
    {
      "mpn": "NE556MP",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ne556m"
  ],
  "discovery_pitch": "NE556M (HGSEMI) 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",
    "ne556m.kicad_sym",
    "ne556m.kicad_mod",
    "ne556m.glb",
    "ne556m.step",
    "ne556m.lbr",
    "docs/hero.png",
    "docs/ne556m-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T03:11:11.680Z"
}