UM823SS

{
  "schema_version": 1,
  "type": "component",
  "slug": "um823ss",
  "title": "UM823SS",
  "brief": "Union Semiconductor Supervisor and Reset ICs, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "um823ss"
  ],
  "component": {
    "mpn": "UM823SS",
    "manufacturer": "Union Semiconductor",
    "package": "SOT-23-5",
    "pin_count": 5,
    "category": "PMIC",
    "subcategory": "Supervisor and Reset ICs",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2401311705_Union-Semiconductor-UM823SS_C7542919.pdf",
    "parts": {
      "symbol": "um823ss.kicad_sym",
      "footprint": "um823ss.kicad_mod",
      "model_3d": "um823ss-etched.glb",
      "model_3d_plain": "um823ss.glb",
      "model_3d_step": "um823ss-etched.step",
      "model_3d_step_plain": "um823ss.step",
      "lbr": "um823ss.lbr"
    },
    "distributor_links": {
      "lcsc": "C7542919"
    },
    "pins": [
      {
        "number": "1",
        "name": "RESET",
        "type": "output",
        "description": "Active-low reset output. Pulses low for 200ms (tRP) when triggered and remains low whenever VCC is below the 2.93V reset threshold or when MR is a logic low. Guaranteed valid down to VCC=1V. VOL<=0.3V @ 4mA sink; VOH>=0.8*VCC @ 1mA source."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for all signals."
      },
      {
        "number": "3",
        "name": "MR",
        "type": "input",
        "description": "Manual-Reset Input (active low). Triggers a reset pulse when pulled below 0.3*VCC. Has an internal ~52kΩ pull-up resistor; can be driven from TTL/CMOS logic or shorted to GND with a switch. Leave open or tie to VCC if unused."
      },
      {
        "number": "4",
        "name": "WDI",
        "type": "input",
        "description": "Watchdog Input. If WDI stays high or low for longer than the watchdog timeout period (1.6s typical), the internal watchdog timer expires and a reset is triggered. The timer clears whenever RESET is asserted or WDI sees a rising or falling edge (min pulse width 50ns). Leaving WDI unconnected or three-stated disables the watchdog."
      },
      {
        "number": "5",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage input. Operating range 1V to 7V; L-version electrical characteristics apply at VCC=4.75V to 5.5V for the family, but this S-variant is monitored at a 2.93V reset threshold."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2401311705_Union-Semiconductor-UM823SS_C7542919.pdf",
        "pages": 11,
        "sha256": "9413e8dcc1f62525",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -1.1375,
        -0.95
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-23-5@sha256:455a3f7c3e5eb5b8",
      "mark": "drawn"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Union Semiconductor",
      "Package": "SOT-23-5",
      "Category": "PMIC",
      "Pins": "5"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "um823ss"
  ],
  "discovery_pitch": "UM823SS (Union Semiconductor) 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",
    "um823ss.kicad_sym",
    "um823ss.kicad_mod",
    "um823ss.glb",
    "um823ss.step",
    "um823ss-etched.step",
    "um823ss.lbr",
    "docs/hero.png",
    "docs/um823ss-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "UM823SS",
      "kind": "packaging"
    },
    {
      "mpn": "UM823SSSP",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-25T13:48:19.540Z"
}