NE555

{
  "schema_version": 1,
  "type": "component",
  "slug": "ne555",
  "title": "NE555",
  "brief": "TI precision 555 timer, SOIC-8. Monostable / astable, 4.5-16 V, 200 mA output. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "timer",
    "555",
    "oscillator",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "NE555",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Timer",
    "subcategory": "Precision timer / oscillator",
    "datasheet": "https://www.ti.com/lit/ds/symlink/ne555.pdf",
    "parts": {
      "symbol": "ne555.kicad_sym",
      "footprint": "ne555.kicad_mod",
      "model_3d": "ne555-etched.glb",
      "model_3d_plain": "ne555.glb",
      "lbr": "ne555.lbr",
      "model_3d_step": "ne555-etched.step",
      "model_3d_step_plain": "ne555.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V). All voltages in the device are referenced to this pin."
      },
      {
        "number": "2",
        "name": "TRIG",
        "type": "input",
        "description": "Trigger input. Starts the timing cycle: when TRIG falls below approximately 1/3 VCC (< 1/2 CONT), the internal flip-flop is set, the output goes high, and the discharge switch opens."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "output",
        "description": "High-current timer output signal. Can sink or source up to 200 mA; TTL-compatible at VCC = 5 V. High level is approximately VCC - 1.7 V, low level is near GND."
      },
      {
        "number": "4",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input. When driven below approximately 0.7 V, the flip-flop is reset and the output is forced low regardless of TRIG/THRES. Tie to VCC when reset is not used."
      },
      {
        "number": "5",
        "name": "CONT",
        "type": "bidirectional",
        "description": "Control voltage pin. Directly sets the upper comparator threshold (nominally 2/3 VCC) and indirectly the lower threshold (1/2 CONT). Bypass to GND with a 0.01 uF capacitor when not driven externally."
      },
      {
        "number": "6",
        "name": "THRES",
        "type": "input",
        "description": "Threshold input. End of timing input: when THRES exceeds CONT (nominally 2/3 VCC), the flip-flop is reset, the output goes low and the discharge switch closes."
      },
      {
        "number": "7",
        "name": "DISCH",
        "type": "output",
        "description": "Discharge. Open-collector output used to discharge the external timing capacitor. Sinks current to GND whenever the internal flip-flop is reset (output low)."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage. Recommended operating range 4.5 V to 16 V (SE555: up to 18 V). Bypass with a low-ESR ceramic capacitor to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/ne555.pdf",
        "pages": 39,
        "sha256": "dae2be1a919b0cfe",
        "source_tier": "mfr"
      },
      "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": "ne555.step",
        "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": "ne555-etched.step",
        "role": "eda",
        "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": "94e18108ef62d6989dd56bf209fbeec84919aaed5216129ebbd71d86c587af64",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Precision timer (555)",
      "Modes": "Monostable, astable",
      "Supply voltage": "4.5-16 V",
      "Output current": "±200 mA (TTL-compatible)",
      "Timing": "External RC network",
      "Package": "SOIC-8",
      "Body (L×W×H)": "4.9 × 3.9 × 1.75 mm"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ne555",
    "555 timer",
    "astable oscillator",
    "monostable timer ic"
  ],
  "discovery_pitch": "NE555 precision timer (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ne555.kicad_sym",
    "ne555.kicad_mod",
    "ne555.glb",
    "ne555.lbr",
    "docs/hero.png",
    "docs/ne555-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ne555-etched.step"
  ],
  "variants": [
    {
      "mpn": "NE555D (SOIC-8, tube)",
      "kind": "packaging"
    },
    {
      "mpn": "NE555DR (SOIC-8, tape & reel)",
      "kind": "packaging"
    }
  ]
}