SA555DR

{
  "schema_version": 1,
  "type": "component",
  "slug": "sa555dr",
  "title": "SA555DR",
  "brief": "Texas Instruments Timers / Clock Oscillators, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "sa555dr"
  ],
  "component": {
    "mpn": "SA555DR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Timers / Clock Oscillators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sa555.pdf",
    "parts": {
      "symbol": "sa555dr.kicad_sym",
      "footprint": "sa555dr.kicad_mod",
      "model_3d": "sa555dr-etched.glb",
      "model_3d_plain": "sa555dr.glb",
      "model_3d_step": "sa555dr-etched.step",
      "model_3d_step_plain": "sa555dr.step",
      "lbr": "sa555dr.lbr"
    },
    "distributor_links": {
      "lcsc": "C6899"
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device."
      },
      {
        "number": "2",
        "name": "TRIG",
        "type": "input",
        "description": "Trigger input. The output pulse begins when a negative-going pulse on TRIG crosses below 1/3 VCC, setting the internal flip-flop and driving OUT high."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "output",
        "description": "Timer output. Drives high (near VCC) during the timing interval and low (near GND) otherwise. Capable of sourcing/sinking up to ~200 mA."
      },
      {
        "number": "4",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset. When held below ~0.7 V, the timing cycle is interrupted and OUT is forced low. Tie to VCC when unused."
      },
      {
        "number": "5",
        "name": "CONT",
        "type": "input",
        "description": "Control voltage. Provides access to the internal 2/3 VCC threshold reference. Typically bypassed to GND with a 10 nF capacitor for noise immunity; can be driven to modulate the timing thresholds."
      },
      {
        "number": "6",
        "name": "THRES",
        "type": "input",
        "description": "Threshold input. Resets the internal flip-flop (ending the output pulse) when the voltage on THRES rises above 2/3 VCC."
      },
      {
        "number": "7",
        "name": "DISCH",
        "type": "output",
        "description": "Discharge. Open-collector output tied to the timing capacitor; provides a low-impedance path to GND to discharge the external timing capacitor between cycles."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage. Operating range 4.5 V to 16 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sa555.pdf",
        "pages": 39,
        "sha256": "c6f5275b8c31eb1d",
        "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sa555dr"
  ],
  "discovery_pitch": "SA555DR (Texas Instruments) 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",
    "sa555dr.kicad_sym",
    "sa555dr.kicad_mod",
    "sa555dr.glb",
    "sa555dr.step",
    "sa555dr-etched.step",
    "sa555dr.lbr",
    "docs/hero.png",
    "docs/sa555dr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "SA555DR",
      "kind": "packaging"
    },
    {
      "mpn": "SA555DRD",
      "kind": "packaging"
    },
    {
      "mpn": "SA555DRP",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T05:29:53.363Z"
}