UM1540S-33

{
  "slug": "um1540s-33",
  "version": "0.1.0",
  "type": "component",
  "description": "Union Semiconductor Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "um1540s-33",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "um1540s-33.kicad_sym",
    "um1540s-33.kicad_mod",
    "um1540s-33.glb",
    "um1540s-33.step",
    "um1540s-33.lbr",
    "docs/hero.png",
    "docs/um1540s-33-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "um1540s-33-hero.glb",
    "um1540s-33-hero.overlay.json",
    "um1540s-33-etched.glb"
  ],
  "component": {
    "mpn": "UM1540S-33",
    "manufacturer": "Union Semiconductor",
    "package": "SOT23-5",
    "pin_count": 5,
    "category": "Power Management (PMIC)",
    "subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603085519282982912",
    "parts": {
      "symbol": "um1540s-33.kicad_sym",
      "footprint": "um1540s-33.kicad_mod",
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      "model_3d_plain": "um1540s-33-etched.glb",
      "model_3d_step": "um1540s-33-etched.step",
      "model_3d_step_plain": "um1540s-33.step",
      "lbr": "um1540s-33.lbr"
    },
    "distributor_links": {
      "lcsc": "C7542870"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T15:29:15Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply input for the LDO, with an input voltage range of 1.8V to 6V and an absolute maximum of -0.3V to +6.5V."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin for the regulator, which the datasheet says should be connected to ground."
      },
      {
        "number": "3",
        "name": "SHDN",
        "type": "input",
        "description": "Shutdown control input: high (VIH min 1.2V) activates the LDO and low (VIL max 0.4V) shuts it down."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected."
      },
      {
        "number": "5",
        "name": "VOUT",
        "type": "power_out",
        "description": "Regulated output of the LDO; the UM1540S-33 gives a fixed 3.3V output, with up to 300mA output current guaranteed."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin-description table on page 4 is garbled in the text extraction. The SOT23-5 column (UM1540S) ; The datasheet lists the SHDN pin only for UM1540 (the shutdown-enabled variant), and the SOT23-5 pin"
        ],
        "pages_sent": 17,
        "cost_usd": 0.0517,
        "at": "2026-10-17T15:27:14"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603085519282982912",
        "pages": 17,
        "sha256": "a2304bd57b300151",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
    },
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        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",
        "checked": "2026-10-17",
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      {
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        "checked": "2026-10-17",
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  }
}