U0349

{
  "schema_version": 1,
  "type": "component",
  "slug": "u0349",
  "title": "U0349",
  "brief": "UNI SEMIC DC-DC Converters, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power management (pmic)",
    "u0349",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "U0349",
    "manufacturer": "UNI SEMIC",
    "package": "ESOP-8",
    "pin_count": 9,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604430090566713344",
    "parts": {
      "symbol": "u0349.kicad_sym",
      "footprint": "u0349.kicad_mod",
      "model_3d": "u0349-hero.glb",
      "model_3d_plain": "u0349-etched.glb",
      "model_3d_step": "u0349-etched.step",
      "model_3d_step_plain": "u0349.step",
      "lbr": "u0349.lbr"
    },
    "distributor_links": {
      "lcsc": "C41374774"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T16:24:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "BS",
        "type": "power_out",
        "description": "Bootstrap pin: a capacitor connected between SW and BST forms the floating supply for the high-side switch driver, with BS voltage limited to -0.3 V to Vsw+5 V."
      },
      {
        "number": "2",
        "name": "IN",
        "type": "power_in",
        "description": "Power supply input; the recommended operating input voltage range is 4.5 V to 38 V, with an absolute maximum VIN of 42 V."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "output",
        "description": "Switching node connecting the internal power MOSFETs to the inductor; SW voltage is limited to -0.3 V to VIN+1 V (-5 V to VIN+2 V for 10 ns transients)."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin, to be connected to a large copper area for heat dissipation."
      },
      {
        "number": "5",
        "name": "FB",
        "type": "input",
        "description": "Adjustable-version feedback input, connected to the center point of the external resistor divider; the feedback voltage is 0.923 V typical (0.900 V to 0.946 V) and the absolute maximum is 6 V."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "7",
        "name": "EN",
        "type": "input",
        "description": "Enable input: drive to logic-high (above 1.1 V rising threshold) to enable the IC, and to logic-low (below 0.9 V falling threshold) to disable it into micro-power shutdown mode."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection."
      },
      {
        "number": "9",
        "name": "EPAD",
        "type": "power_in",
        "description": "Exposed thermal pad, listed with GND as \"4/9\" in the pin table, to be connected to a large copper area for thermal performance."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "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 datasheet pin table lists 'GND/EPAD' as '4/9'; pin 4 is GND and pin 9 is inferred to be the expo; Pins 6 and 8 are marked NC (no connection) in the datasheet and are listed as unconnected.; The datasheet's Pin Description table and the ESOP8 package drawing (page 12) do not give a pin-1 or"
        ],
        "pages_sent": 14,
        "cost_usd": 0.0535,
        "at": "2026-10-18T16:22:24"
      },
      "datasheet": {
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        "pages": 14,
        "sha256": "2c3df820105e0479",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f1718a42c5ea007e8e2dd672ac39a1bb358ee4849bd53c42e21ce83e0e5df7a9",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "sha256": "c901e2622666ce0298c985006a6fd02fbf42bc64c9bfa25dc13973aae13eac71",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "UNI SEMIC",
      "Package": "ESOP-8",
      "Category": "Power Management (PMIC)",
      "Pins": "9"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "2c3df820105e04795abca8a4f059785475a0b58848954383cea0fc272cc2afd0",
      "rows": [
        {
          "name": "Operating junction temperature",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
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        {
          "name": "Operating temperature range",
          "symbol": "",
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          "min": -40,
          "typ": null,
          "max": 85,
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          "source": "datasheet"
        },
        {
          "name": "Input voltage",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.5,
          "typ": null,
          "max": 38,
          "conditions": "",
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        {
          "name": "Output current",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "A",
          "min": 0,
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        },
        {
          "name": "VIN voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 42,
          "conditions": "",
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        },
        {
          "name": "EN voltage",
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        {
          "name": "SW voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Printed max VIN+1V",
          "source_page": 4,
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        },
        {
          "name": "SW voltage (10ns transient)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -5,
          "typ": null,
          "max": null,
          "conditions": "10ns transient; printed max VIN+2V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "BS voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Printed max Vsw+5V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "FB voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
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        {
          "name": "Storage temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Lead temperature (soldering)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "Soldering, 10 sec.",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ESD Human Body Model",
          "symbol": "V(ESD-HBM)",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -2000,
          "typ": null,
          "max": 2000,
          "conditions": "ANSI/ESDA/JEDEC JS-001-2014, Class 2",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ESD Charged Device Model",
          "symbol": "V(ESD-CDM)",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -200,
          "typ": null,
          "max": 200,
          "conditions": "ANSI/ESDA/JEDEC JS-002-2014, Class C0b",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Latch-up",
          "symbol": "ILATCH-UP",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -150,
          "typ": null,
          "max": 150,
          "conditions": "JEDEC STANDARD NO.78E, Class I",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Input Voltage Range",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 4.5,
          "typ": null,
          "max": 38,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Supply Current (Quiescent)",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.6,
          "max": 0.8,
          "conditions": "VEN =3.0V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Supply Current (Shutdown)",
          "symbol": "",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": null,
          "max": 4,
          "conditions": "VEN =0 or EN = GND",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Feedback Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": 0.923,
          "max": 0.946,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Valley Switch Current Limit",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "EN Rising Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.1,
          "typ": null,
          "max": null,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "EN Falling Threshold",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.9,
          "conditions": "",
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        },
        {
          "name": "Under-Voltage Lockout Threshold Wake up VIN Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 3.8,
          "max": 4.1,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Under-Voltage Lockout Threshold Shutdown VIN Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 3.2,
          "typ": 3.5,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-ambient thermal resistance",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 48.7,
          "max": null,
          "conditions": "JESD 51-7, 4-layer JEDEC board",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-case (top) thermal resistance",
          "symbol": "RθJC(top)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 52.4,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-board thermal resistance",
          "symbol": "RθJB",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 25.5,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-top characterization parameter",
          "symbol": "ψJT",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 8.4,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-board characterization parameter",
          "symbol": "ψJB",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 25.2,
          "max": null,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Junction-to-case (bottom) thermal resistance",
          "symbol": "θJCbot",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 6.5,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_pitch": "U0349 (UNI SEMIC) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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