SN3948

{
  "slug": "sn3948",
  "version": "0.1.0",
  "type": "component",
  "description": "ISSI Integrated Silicon Solution DC-DC Converters, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management (pmic)",
    "sn3948",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn3948.kicad_sym",
    "sn3948.kicad_mod",
    "sn3948.glb",
    "sn3948.step",
    "sn3948.lbr",
    "docs/hero.png",
    "docs/sn3948-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn3948-hero.glb",
    "sn3948-hero.overlay.json",
    "sn3948-etched.glb"
  ],
  "component": {
    "mpn": "SN3948",
    "manufacturer": "ISSI Integrated Silicon Solution",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589838754354794496",
    "parts": {
      "symbol": "sn3948.kicad_sym",
      "footprint": "sn3948.kicad_mod",
      "model_3d": "sn3948-hero.glb",
      "model_3d_plain": "sn3948-etched.glb",
      "model_3d_step": "sn3948-etched.step",
      "model_3d_step_plain": "sn3948.step",
      "lbr": "sn3948.lbr"
    },
    "distributor_links": {
      "lcsc": "C3041112"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T02:25:50Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC",
        "type": "power_in",
        "description": "Chip supply pin, internally regulated to 5 V typical (clamp 4.4 V to 5.6 V at Rin = 10 kΩ), with a maximum VCC input current of 10 mA before the clamp may fail."
      },
      {
        "number": "2",
        "name": "TOFF",
        "type": "input",
        "description": "Resistor to GND sets the minimum constant off-time of the NMOS; the datasheet gives 10 µs at Rext = 250 kΩ and recommends about 1 µs typical."
      },
      {
        "number": "3",
        "name": "ADJ",
        "type": "input",
        "description": "Chip enable and input peak-current threshold control: below 0.5 V the NMOS is held off, 0.5 V to 2.4 V sets VCSTH = VADJ/10, above 2.4 V VCSTH is fixed at 0.24 V, and when floating it is pulled up internally to 4.5 V (VCSTH = 0.24 V)."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin for the controller; the Rfb ground return should run short and wide to this pin for output-current accuracy."
      },
      {
        "number": "5",
        "name": "GATE",
        "type": "output",
        "description": "Gate drive output for the external NMOS switch, with gate drive current set by switching frequency and the NMOS gate charge."
      },
      {
        "number": "6",
        "name": "CS",
        "type": "input",
        "description": "Input peak-current sense pin fed from the resistor Rcs between the NMOS source and GND; the sense threshold VCSTH is 215 mV to 265 mV (240 mV typical) at ADJ = 5 V."
      },
      {
        "number": "7",
        "name": "FB",
        "type": "input",
        "description": "Output-current sense pin fed from the external sense resistor Rfb in series with the LED string; the feedback threshold is 0.29 V to 0.31 V (0.3 V typical), so Iout = 0.3 V / Rfb."
      },
      {
        "number": "8",
        "name": "OVP",
        "type": "input",
        "description": "Overvoltage-protection sense pin: when the voltage on this pin exceeds 1 V (VOVP-TH 0.9 V to 1.1 V) the NMOS is turned off."
      }
    ],
    "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 datasheet is by SI-EN Technology (矽恩微电子), not ISSI Integrated Silicon Solution as stated in the ; The datasheet's ordering table lists the SOP-8 variant as SN3948ID08E (2500 pcs/reel, RoHS, -40 °C t"
        ],
        "pages_sent": 13,
        "cost_usd": 0.0635,
        "at": "2026-10-18T02:23:41"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589838754354794496",
        "pages": 13,
        "sha256": "01443d38f21bc0fb",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "sn3948.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn3948-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "b1a98950a94bd677f101664761942a7885a66dc99542602c86232ab3122853e7",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}