main
Ray Set visibility: public 3086c17 4d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "sd4938tr",
  "title": "SD4938TR",
  "brief": "SILAN(士兰微) , SOP-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": [
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    "sd4938tr",
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  "component": {
    "mpn": "SD4938TR",
    "manufacturer": "SILAN(士兰微)",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "IC",
    "subcategory": "IC",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589835405353639936",
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      "footprint": "sd4938tr.kicad_mod",
      "model_3d": "sd4938tr-hero.glb",
      "model_3d_plain": "sd4938tr-etched.glb",
      "model_3d_step": "sd4938tr-etched.step",
      "model_3d_step_plain": "sd4938tr.step",
      "lbr": "sd4938tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C5198081"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T13:33:56Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Supplies the control circuitry; the datasheet gives a startup threshold of 12.1-13.9V (13V typ), an undervoltage point of 7.9-9.5V (8.7V typ), an overvoltage point of 21.5-24.5V (23V typ), a clamp of 28-35V (31V typ), and an operating range of 10-21V after startup."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; the datasheet lists this pin as not connected."
      },
      {
        "number": "3",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; the datasheet lists this pin as not connected."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; the datasheet lists this pin as not connected."
      },
      {
        "number": "5",
        "name": "DRAIN",
        "type": "output",
        "description": "Drain of the internal power MOSFET; the DRAIN-to-SOURCE high-voltage rating is 155V maximum, and the device is specified for a 20V to 150V input."
      },
      {
        "number": "6",
        "name": "DRAIN",
        "type": "output",
        "description": "Drain of the internal power MOSFET; the DRAIN-to-SOURCE high-voltage rating is 155V maximum, and the device is specified for a 20V to 150V input."
      },
      {
        "number": "7",
        "name": "VSET",
        "type": "input",
        "description": "Sets the output voltage: left floating gives 12V, tied to GND gives 15V, and a 51kΩ resistor to GND gives 18V."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Source of the power MOSFET and reference ground for the control circuit."
      }
    ],
    "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 classifies VDD as I/O; it is mapped here to power_in because it is the control circuit; DRAIN is printed as O in the datasheet and mapped to output; the two pins share the same net and are; Three pins are marked NC with no further detail. Each is listed separately as unconnected."
        ],
        "pages_sent": 8,
        "cost_usd": 0.0393,
        "at": "2026-10-19T13:31:20"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589835405353639936",
        "pages": 8,
        "sha256": "4906b119d773c253",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
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        "sha256": "b8c6ea5bca0d30b937afda6f6789ab19326ebb2ddb3c48b60b4f3ed2b4896245",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "SILAN(士兰微)",
      "Package": "SOP-8",
      "Category": "",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "4906b119d773c253849eef8ce670f2a69242cc97ee2c5bfa813c9804b794bad5",
      "rows": [
        {
          "name": "VDD operating voltage range (after startup)",
          "symbol": "VDD",
          "kind": "electrical",
          "unit": "V",
          "min": 10,
          "typ": null,
          "max": 21,
          "conditions": "启动后",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VDD start-up voltage",
          "symbol": "VDDON",
          "kind": "electrical",
          "unit": "V",
          "min": 12.1,
          "typ": 13,
          "max": 13.9,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VDD under-voltage protection point",
          "symbol": "VDDOFF",
          "kind": "electrical",
          "unit": "V",
          "min": 7.9,
          "typ": 8.7,
          "max": 9.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VDD restart threshold",
          "symbol": "VDDRESTART",
          "kind": "electrical",
          "unit": "V",
          "min": 6,
          "typ": 6.5,
          "max": 7,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VDD over-voltage protection voltage",
          "symbol": "VDDOVP",
          "kind": "electrical",
          "unit": "V",
          "min": 21.5,
          "typ": 23,
          "max": 24.5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "VDD clamp voltage",
          "symbol": "VDDCLAMP",
          "kind": "electrical",
          "unit": "V",
          "min": 28,
          "typ": 31,
          "max": 35,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Normal operating switching frequency",
          "symbol": "fSW1",
          "kind": "electrical",
          "unit": "KHz",
          "min": 54,
          "typ": 60,
          "max": 66,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Frequency jitter range",
          "symbol": "FD",
          "kind": "electrical",
          "unit": "%",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum duty cycle",
          "symbol": "DMAX",
          "kind": "electrical",
          "unit": "%",
          "min": 74,
          "typ": 80,
          "max": 86,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Peak current limit point",
          "symbol": "IPKLIM",
          "kind": "electrical",
          "unit": "A",
          "min": 1.4,
          "typ": 1.6,
          "max": 1.8,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "High-voltage input (DRAIN to SOURCE)",
          "symbol": "VHV,MAX",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 155,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage (VDD to SOURCE)",
          "symbol": "VDD,MAX",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 0.8,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "TJ",
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          "unit": "C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating ambient temperature range",
          "symbol": "Tamb",
          "kind": "recommended_operating",
          "unit": "C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction-to-ambient",
          "symbol": "θja",
          "kind": "thermal",
          "unit": "C/W",
          "min": null,
          "typ": null,
          "max": 140,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction-to-case (surface)",
          "symbol": "θjc",
          "kind": "thermal",
          "unit": "C/W",
          "min": null,
          "typ": null,
          "max": 28,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_triggers": [
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  "discovery_pitch": "SD4938TR (SILAN(士兰微)) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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}