main
Ray Set visibility: public 38a0047 7d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "lt1946aems8e-pbf",
  "title": "LT1946AEMS8E#PBF",
  "brief": "Analog Devices DC-DC Converters, MSOP-8-EP. 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 ics",
    "lt1946aems8e#pbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LT1946AEMS8E#PBF",
    "manufacturer": "Analog Devices",
    "package": "MSOP-8-EP",
    "pin_count": 9,
    "category": "Power Management ICs",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/1946afs.pdf",
    "parts": {
      "symbol": "lt1946aems8e-pbf.kicad_sym",
      "footprint": "lt1946aems8e-pbf.kicad_mod",
      "model_3d": "lt1946aems8e-pbf-hero.glb",
      "model_3d_plain": "lt1946aems8e-pbf-etched.glb",
      "model_3d_step": "lt1946aems8e-pbf-etched.step",
      "model_3d_step_plain": "lt1946aems8e-pbf.step",
      "lbr": "lt1946aems8e-pbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C665602",
      "digikey": "LT1946AEMS8E#PBF-ND",
      "mouser": "584-LT1946AEMS8E#PBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-31T09:25:29Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LT1946AEMS8E#PBF-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT1946AEMS8E#PBF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VC",
        "type": "passive",
        "description": "Error amplifier output pin for external compensation (series resistor and capacitor to GND, typically 90pF to 270pF and 25k to 120k) or shorted to COMP for internal compensation."
      },
      {
        "number": "2",
        "name": "FB",
        "type": "input",
        "description": "Feedback pin with 1.25V reference voltage; connect the resistive divider tap here, with VOUT = 1.25 • (1+R1/R2)."
      },
      {
        "number": "3",
        "name": "SHDN",
        "type": "input",
        "description": "Shutdown pin; tie to 2.4V or more to enable the device, ground to shut down, and do not float this pin."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin; tie both Pin 4 and the exposed pad directly to the local ground plane for heat dissipation."
      },
      {
        "number": "5",
        "name": "SW",
        "type": "passive",
        "description": "Switch pin, the collector of the internal NPN power switch (1.5A, 36V); minimize the metal trace area to minimize EMI."
      },
      {
        "number": "6",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply pin (2.45V to 16V operating) that must be locally bypassed."
      },
      {
        "number": "7",
        "name": "COMP",
        "type": "passive",
        "description": "Internal compensation pin providing an internal network (120k and 90pF); tie directly to the VC pin for internal compensation or to GND if not used."
      },
      {
        "number": "8",
        "name": "SS",
        "type": "passive",
        "description": "Soft-start pin where an external capacitor is charged by 4µA to 1.5V; use a larger capacitor for slower start-up and leave floating if not in use."
      },
      {
        "number": "9",
        "name": "EP",
        "type": "power_in",
        "description": "Exposed pad is ground and must be soldered to the PCB and tied to the local ground plane."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The exposed pad is not numbered in the datasheet. It is listed here as pin 9 and is internally the s; Types for VC, COMP, SS and SW are chosen as passive. The datasheet gives no ERC class, so confirm th",
          "1/9 pins cited to the wrong page (name found elsewhere): ['9:EP@p4']"
        ],
        "pages_sent": 12,
        "cost_usd": 0.1226,
        "at": "2026-10-31T09:25:12"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/1946afs.pdf",
        "pages": 12,
        "sha256": "84a27bebe27b50dd",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lt1946aems8e-pbf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.9,
          3,
          0.96
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "43252be3beac8fd30ca9bfeb82a613fa01d5dffff9b22810c13a4655daafb5ee",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lt1946aems8e-pbf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          0.96
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "6d76e92941b2a1daecad6ea47b1472ad23a362c2869a6092ac06c3af41bf3ad8",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "MS8E",
      "source_page": 11,
      "D": {
        "nom_mm": 3,
        "range_mm": [
          null,
          null
        ]
      },
      "E1": {
        "nom_mm": 3,
        "range_mm": [
          null,
          null
        ]
      },
      "E": {
        "nom_mm": 4.88,
        "range_mm": [
          null,
          null
        ]
      },
      "e": {
        "nom_mm": 0.65,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 1.1,
        "range_mm": [
          null,
          1.1
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "lt1946aems8e-pbf.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Analog Devices",
      "Package": "MSOP-8-EP",
      "Category": "Power Management ICs",
      "Pins": "9"
    },
    "appearance": {
      "contacts": {
        "quote": "PIN 1(VC) AND PIN 2(FB). USE MULTIPLE VIAS TO TIE PIN 4 COPPER TO GROUND PLANE. USE",
        "page": 9,
        "doc": "ds.pdf",
        "material": "COPPER"
      },
      "version": 1,
      "datasheet_sha256": "84a27bebe27b50ddf7277e1423d9e47c3add9e795906672d5d631859f2931337"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "84a27bebe27b50ddf7277e1423d9e47c3add9e795906672d5d631859f2931337",
      "rows": [
        {
          "name": "Minimum Operating Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 2.45,
          "max": 2.6,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum Operating Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 16,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Feedback Voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.23,
          "typ": 1.25,
          "max": 1.27,
          "conditions": "TA = 25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Feedback Voltage (full temperature range)",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 1.22,
          "typ": null,
          "max": 1.27,
          "conditions": "Over full operating temperature range",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "FB Pin Bias Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 20,
          "max": 120,
          "conditions": "VFB = 1.25V (Note 3)",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3.6,
          "max": 5,
          "conditions": "VSHDN = 2.5V, Not Switching",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Current in Shutdown",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0,
          "max": 1,
          "conditions": "VSHDN = 0V, VIN = 3V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Reference Line Regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "%/V",
          "min": null,
          "typ": 0.01,
          "max": 0.05,
          "conditions": "2.6V ≤ VIN ≤ 16V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Switching Frequency",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": 2.4,
          "typ": 2.7,
          "max": 3,
          "conditions": "TA = 25°C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Switching Frequency (full temperature range)",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": 2.3,
          "typ": null,
          "max": 3.1,
          "conditions": "Over full operating temperature range",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum Duty Cycle",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": 73,
          "typ": 80,
          "max": null,
          "conditions": "Over full operating temperature range",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Switch Current Limit",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": 1.5,
          "typ": 2.1,
          "max": 3.1,
          "conditions": "Note 4; over full operating temperature range",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Switch VCESAT",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 240,
          "max": 340,
          "conditions": "ISW = 1A",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Switch Leakage Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.01,
          "max": 1,
          "conditions": "VSW = 5V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Soft-Start Charging Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": 2.5,
          "typ": 4,
          "max": 6,
          "conditions": "VSS = 0.5V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "SHDN Input Voltage High",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "SHDN Input Voltage Low",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "SHDN Pin Bias Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 16,
          "max": 32,
          "conditions": "VSHDN = 3V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "SHDN Pin Bias Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0,
          "max": 0.1,
          "conditions": "VSHDN = 0V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Transconductance",
          "symbol": "",
          "kind": "electrical",
          "unit": "µmhos",
          "min": null,
          "typ": 40,
          "max": null,
          "conditions": "∆I = 2µA",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Error Amp Voltage Gain",
          "symbol": "",
          "kind": "electrical",
          "unit": "V/V",
          "min": null,
          "typ": 300,
          "max": null,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Switching Frequency in Foldback",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": null,
          "typ": 0.85,
          "max": null,
          "conditions": "VFB = 0V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "VIN Voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 16,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "SW Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": 36,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "FB Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 2.5,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Current into FB Pin",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "SHDN Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 16,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature",
          "symbol": "TJMAX",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature Range",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "Note 2",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Lead Temperature (Soldering, 10 sec)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Ambient",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 40,
          "max": null,
          "conditions": "MS8E package",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal Resistance Junction-to-Case",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 10,
          "max": null,
          "conditions": "MS8E package",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
  },
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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