UM823RS

{
  "schema_version": 1,
  "type": "component",
  "slug": "um823rs",
  "title": "UM823RS",
  "brief": "Union Semiconductor Supervisor and Reset ICs, SOT-23-5. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "um823rs"
  ],
  "component": {
    "mpn": "UM823RS",
    "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/2308251149_Union-Semiconductor-UM823RS_C7542918.pdf",
    "parts": {
      "symbol": "um823rs.kicad_sym",
      "footprint": "um823rs.kicad_mod",
      "model_3d": "um823rs-etched.glb",
      "model_3d_plain": "um823rs.glb",
      "model_3d_step": "um823rs-etched.step",
      "model_3d_step_plain": "um823rs.step",
      "lbr": "um823rs.lbr"
    },
    "distributor_links": {
      "lcsc": "C7542918"
    },
    "pins": [
      {
        "number": "1",
        "name": "RESET",
        "type": "output",
        "description": "Active-low reset output. Pulses low for 200 ms (typ) when triggered and remains low whenever VCC is below the 2.63 V (typ) reset threshold or when MR is a logic low. Guaranteed valid down to VCC = 1 V. Push-pull output sinks/sources current (VOL ≤ 0.3 V @ 4 mA, VOH ≥ 0.8·VCC @ 1 mA)."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for all signals."
      },
      {
        "number": "3",
        "name": "MR",
        "type": "input",
        "description": "Active-low manual-reset input. Triggers a reset pulse when pulled below 0.3·VCC. Has an internal 52 kΩ (35-75 kΩ) pull-up to VCC; may be driven from TTL/CMOS logic, shorted to GND with a switch, or left open. Connect to VCC if unused."
      },
      {
        "number": "4",
        "name": "WDI",
        "type": "input",
        "description": "Watchdog input. If WDI remains high or low longer than the 1.6 s (typ) watchdog timeout period, the internal watchdog timer expires and a reset is triggered. The watchdog timer clears on any rising or falling edge (min 50 ns pulse) or whenever RESET is asserted. Leaving WDI unconnected or three-stated disables the watchdog function."
      },
      {
        "number": "5",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage input. Operating range 1.0 V to 7 V (absolute max 8 V). Typical supply current 3 µA (R/S/T/Y/Z threshold options) with MR and WDI unconnected."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2308251149_Union-Semiconductor-UM823RS_C7542918.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"
    },
    "models_3d": [
      {
        "file": "um823rs.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "um823rs-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "23a8e7c035decb561c74747a52c5212048e946f4f59cc9305ce1560be44ef32f",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Union Semiconductor",
      "Package": "SOT-23-5",
      "Category": "PMIC",
      "Pins": "5"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "um823rs"
  ],
  "discovery_pitch": "UM823RS (Union Semiconductor) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "um823rs.kicad_sym",
    "um823rs.kicad_mod",
    "um823rs.glb",
    "um823rs.step",
    "um823rs.lbr",
    "docs/hero.png",
    "docs/um823rs-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "um823rs-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "UM823RS",
      "kind": "packaging"
    },
    {
      "mpn": "UM823RP",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-25T13:48:11.116Z"
}