VIPER318LDTR

{
  "slug": "viper318ldtr",
  "version": "0.1.0",
  "type": "component",
  "description": "STMicroelectronics AC-DC Controllers And Regulators, SO-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "viper318ldtr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "viper318ldtr.kicad_sym",
    "viper318ldtr.kicad_mod",
    "viper318ldtr.glb",
    "viper318ldtr.step",
    "viper318ldtr.lbr",
    "docs/hero.png",
    "docs/viper318ldtr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "viper318ldtr-hero.glb",
    "viper318ldtr-hero.overlay.json",
    "viper318ldtr-etched.glb"
  ],
  "component": {
    "mpn": "VIPER318LDTR",
    "manufacturer": "STMicroelectronics",
    "package": "SO-16",
    "pin_count": 16,
    "category": "Power Management (PMIC)",
    "subcategory": "AC-DC Controllers And Regulators",
    "datasheet": "https://www.st.com/resource/en/datasheet/viper318ldtr.pdf",
    "parts": {
      "symbol": "viper318ldtr.kicad_sym",
      "footprint": "viper318ldtr.kicad_mod",
      "model_3d": "viper318ldtr-hero.glb",
      "model_3d_plain": "viper318ldtr-etched.glb",
      "model_3d_step": "viper318ldtr-etched.step",
      "model_3d_step_plain": "viper318ldtr.step",
      "lbr": "viper318ldtr.lbr"
    },
    "distributor_links": {
      "lcsc": "C3093815",
      "digikey": "497-VIPER318LDTR-ND",
      "mouser": "511-VIPER318LDTR"
    },
    "distributor_check": {
      "checked_at": "2026-10-31T00:59:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-VIPER318LDTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "511-VIPER318LDTR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground and MOSFET source, carrying both the internal MOSFET source and the bias current return; all bias component grounds must tie to a trace to this pin, kept separate from the pulsed current return."
      },
      {
        "number": "2",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not connected; when designing the PCB this pin can be soldered to GND."
      },
      {
        "number": "3",
        "name": "VCC",
        "type": "power_in",
        "description": "Controller supply with an external storage capacitor across VCC and GND; the pin is internally tied to the high-voltage current source that charges VCC at startup, and a 0.1 µF bypass capacitor placed close to the IC is recommended."
      },
      {
        "number": "4",
        "name": "N.A.",
        "type": "passive",
        "description": "Not available for user; mechanically connected to the controller die pad, and it is highly recommended to connect it to GND to improve noise immunity."
      },
      {
        "number": "5",
        "name": "UVP",
        "type": "input",
        "description": "Undervoltage protection input: the IC is disabled when VUVP stays below VUVP_th (0.4 V typ.) for more than tUVP_DEB (30 ms typ.), and it resumes after tUVP_REST (30 ms typ.) once VUVP rises above the threshold; leave open if the function is not required."
      },
      {
        "number": "6",
        "name": "OVP",
        "type": "input",
        "description": "Overvoltage protection input: when VOVP exceeds VOVP_th (4 V typ.) for more than tOVP_DEB (250 µs typ.) the PWM is disabled in auto-restart for tOVP_REST (500 ms typ.); connect to GND if the function is not required."
      },
      {
        "number": "7",
        "name": "FB",
        "type": "input",
        "description": "Direct feedback, the inverting input of the internal transconductance E/A referenced to 1.2 V with respect to GND; the E/A is disabled if FB is connected to GND."
      },
      {
        "number": "8",
        "name": "COMP",
        "type": "output",
        "description": "Output of the internal E/A that requires a compensation network to GND for loop stability; in secondary feedback the COMP pin is driven directly by the optocoupler to set the DRAIN peak current setpoint."
      },
      {
        "number": "9",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not connected; must be left floating to maintain a safe clearance distance."
      },
      {
        "number": "10",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not connected; must be left floating to maintain a safe clearance distance."
      },
      {
        "number": "11",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not connected; must be left floating to maintain a safe clearance distance."
      },
      {
        "number": "12",
        "name": "N.C.",
        "type": "unconnected",
        "description": "Not connected; must be left floating to maintain a safe clearance distance."
      },
      {
        "number": "13",
        "name": "DRAIN",
        "type": "passive",
        "description": "MOSFET drain, from which the internal high-voltage current source charges the VCC capacitor at startup; these pins are tied to the internal metal pad for heat dissipation and PCB copper under them lowers junction-to-ambient thermal resistance."
      },
      {
        "number": "14",
        "name": "DRAIN",
        "type": "passive",
        "description": "MOSFET drain, from which the internal high-voltage current source charges the VCC capacitor at startup; these pins are tied to the internal metal pad for heat dissipation and PCB copper under them lowers junction-to-ambient thermal resistance."
      },
      {
        "number": "15",
        "name": "DRAIN",
        "type": "passive",
        "description": "MOSFET drain, from which the internal high-voltage current source charges the VCC capacitor at startup; these pins are tied to the internal metal pad for heat dissipation and PCB copper under them lowers junction-to-ambient thermal resistance."
      },
      {
        "number": "16",
        "name": "DRAIN",
        "type": "passive",
        "description": "MOSFET drain, from which the internal high-voltage current source charges the VCC capacitor at startup; these pins are tied to the internal metal pad for heat dissipation and PCB copper under them lowers junction-to-ambient thermal resistance."
      }
    ],
    "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 order code table (Table 11, page 34) is not in the supplied pages, so the text does not confirm ; Pin 4 (N.A.) is described as not available for user, and the datasheet recommends connecting it to G; ERC types for DRAIN, COMP and the N.A. pin are my interpretation of the functional descriptions; the",
          "2/16 pins cited to the wrong page (name found elsewhere): ['11:N.C.@p3', '14:DRAIN@p3']"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0406,
        "at": "2026-10-31T00:59:30"
      },
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/viper318ldtr.pdf",
        "pages": 40,
        "sha256": "200c56a12395fdf1",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "viper318ldtr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "viper318ldtr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d06b780c16599162f908e9d4dc25b057d1b2b5b4896b96b45b0fb43e1e1cb8df",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "SO16N",
      "source_page": 33,
      "D": {
        "nom_mm": 9.9,
        "range_mm": [
          9.8,
          10.0
        ]
      },
      "E1": {
        "nom_mm": 3.9,
        "range_mm": [
          3.8,
          4.0
        ]
      },
      "E": {
        "nom_mm": 6.0,
        "range_mm": [
          5.8,
          6.2
        ]
      },
      "e": {
        "nom_mm": 1.27,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 1.75,
        "range_mm": [
          null,
          1.75
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "viper318ldtr.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}