IS31FL3729-QFLS4-TR

{
  "schema_version": 1,
  "type": "component",
  "slug": "is31fl3729-qfls4-tr",
  "title": "IS31FL3729-QFLS4-TR",
  "brief": "ISSI Integrated Silicon Solution LED Drivers, QFN-32-EP(4x4). 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",
    "led drivers",
    "is31fl3729-qfls4-tr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "IS31FL3729-QFLS4-TR",
    "manufacturer": "ISSI Integrated Silicon Solution",
    "package": "QFN-32-EP(4x4)",
    "pin_count": 33,
    "category": "LED Drivers",
    "subcategory": "LED Drivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589836133233156096",
    "parts": {
      "symbol": "is31fl3729-qfls4-tr.kicad_sym",
      "footprint": "is31fl3729-qfls4-tr.kicad_mod",
      "model_3d": "is31fl3729-qfls4-tr-hero.glb",
      "model_3d_plain": "is31fl3729-qfls4-tr-etched.glb",
      "model_3d_step": "is31fl3729-qfls4-tr-etched.step",
      "model_3d_step_plain": "is31fl3729-qfls4-tr.step",
      "lbr": "is31fl3729-qfls4-tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C2940549",
      "digikey": "2521-IS31FL3729-QFLS4-TR-ND",
      "mouser": "870-IS31FL3729QFLS4T"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T08:41:35Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2521-IS31FL3729-QFLS4-TR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "870-IS31FL3729QFLS4T",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CS4",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "2",
        "name": "CS5",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "3",
        "name": "CS6",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "4",
        "name": "CS7",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "5",
        "name": "CS8",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "6",
        "name": "CS9",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "7",
        "name": "CS10",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "8",
        "name": "CS11",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "9",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; must be connected to the thermal pad and system ground."
      },
      {
        "number": "10",
        "name": "CS12",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "11",
        "name": "CS13",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "12",
        "name": "CS14",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "13",
        "name": "CS15",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "14",
        "name": "SW9/CS16",
        "type": "power_out",
        "description": "Switch power source SW9 for the matrix row, also functioning as current sink CS16; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "15",
        "name": "SW8",
        "type": "power_out",
        "description": "Switch power source for matrix row 8; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "16",
        "name": "SW7",
        "type": "power_out",
        "description": "Switch power source for matrix row 7; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "17",
        "name": "SW6",
        "type": "power_out",
        "description": "Switch power source for matrix row 6; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "18",
        "name": "SW5",
        "type": "power_out",
        "description": "Switch power source for matrix row 5; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "19",
        "name": "SW4",
        "type": "power_out",
        "description": "Switch power source for matrix row 4; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "20",
        "name": "SW3",
        "type": "power_out",
        "description": "Switch power source for matrix row 3; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "21",
        "name": "SW2",
        "type": "power_out",
        "description": "Switch power source for matrix row 2; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "22",
        "name": "SW1",
        "type": "power_out",
        "description": "Switch power source for matrix row 1; SWx carries the combined current of the CSy pins, so its trace must be much wider than a CSy trace."
      },
      {
        "number": "23",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply, 2.7 V to 5.5 V; place VCC capacitors close to this pin."
      },
      {
        "number": "24",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; must be connected to the thermal pad and system ground."
      },
      {
        "number": "25",
        "name": "ISET",
        "type": "passive",
        "description": "Current setting pin; an external resistor RISET to GND sets the output current (example RISET=10kΩ), and it should be placed close to the chip."
      },
      {
        "number": "26",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data, open-collector with pull-up resistor (about 4.7kΩ at 400kHz, 2kΩ at 1MHz); logic 0 max 0.4 V or 0.6 V depending on LGC."
      },
      {
        "number": "27",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input, supporting up to 1MHz; logic-high threshold is 1.4 V or 2.4 V depending on LGC."
      },
      {
        "number": "28",
        "name": "AD",
        "type": "input",
        "description": "I2C address setting; tie to GND, SCL, SDA or VCC to select A2:A1 of the 7-bit slave address."
      },
      {
        "number": "29",
        "name": "SDB",
        "type": "input",
        "description": "Shutdown pin; pulling low places the chip in hardware shutdown, and a rising edge after VCC is above 2.4 V resets the I2C interface."
      },
      {
        "number": "30",
        "name": "CS1",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "31",
        "name": "CS2",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "32",
        "name": "CS3",
        "type": "output",
        "description": "Current sink output for the LED matrix; maximum constant current is 35 mA per CSy at RISET=10kΩ."
      },
      {
        "number": "33",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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 QFN-32 top-view figure text on page 3 is not positionally extractable, so the pin-to-name mappin; The QFN-32 exposed thermal pad is not given a pin number in the datasheet ('Thermal Pad Need to conn; Pin 14 is dual-function (SW9/CS16); it is typed power_out as a switch source. Pin types for CS, SW, ",
          "exposed pad 33 added from the footprint"
        ],
        "pages_sent": 24,
        "cost_usd": 0.1131,
        "at": "2026-10-17T08:41:17"
      },
      "datasheet": {
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        "pages": 24,
        "sha256": "afd9a2c45d575a8c",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
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        "up": "Z",
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        "origin": "footprint origin = pad-pattern centre",
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        "centre_offset_mm": 0,
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        "sha256": "7b482a511cdf2cf875c31931f9fea7f745b8dac2ea6203531cd6604f40a290cb",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
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    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ISSI Integrated Silicon Solution",
      "Package": "QFN-32-EP(4x4)",
      "Category": "LED Drivers",
      "Pins": "33"
    },
    "characteristics": {
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        },
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          "name": "Maximum constant current of CSx",
          "symbol": "IOUT",
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        },
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          "name": "Quiescent power supply current",
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          "max": 3,
          "conditions": "VSDB=VCC, all LEDs off",
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          "name": "Shutdown current",
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        },
        {
          "name": "Current switch headroom voltage SWx",
          "symbol": "VHR",
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        {
          "name": "Logic 0 input voltage (LGC=0)",
          "symbol": "VIL",
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          "max": 0.4,
          "conditions": "VCC=2.7V~5.5V, LGC=0",
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        {
          "name": "Logic 1 input voltage (LGC=0)",
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        {
          "name": "Logic 1 input voltage (LGC=1)",
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        {
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          "symbol": "IIL",
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          "unit": "nA",
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          "name": "Serial-clock frequency (Fast Mode Plus)",
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          "name": "Bus free time between STOP and START (Fast Mode)",
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          "name": "Hold time (repeated) START condition (Fast Mode)",
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          "name": "Hold time (repeated) START condition (Fast Mode Plus)",
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        {
          "name": "Repeated START condition setup time (Fast Mode)",
          "symbol": "tSU, STA",
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        {
          "name": "Repeated START condition setup time (Fast Mode Plus)",
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          "name": "STOP condition setup time (Fast Mode)",
          "symbol": "tSU, STO",
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        {
          "name": "STOP condition setup time (Fast Mode Plus)",
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        {
          "name": "Data setup time (Fast Mode)",
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          "kind": "timing",
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          "min": 100,
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        {
          "name": "Data setup time (Fast Mode Plus)",
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          "kind": "timing",
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          "min": 50,
          "typ": null,
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          "name": "SCL clock low period (Fast Mode)",
          "symbol": "tLOW",
          "kind": "timing",
          "unit": "µs",
          "min": 1.3,
          "typ": null,
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        {
          "name": "SCL clock low period (Fast Mode Plus)",
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        {
          "name": "SCL clock high period (Fast Mode)",
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          "min": 0.7,
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        {
          "name": "SCL clock high period (Fast Mode Plus)",
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        {
          "name": "Rise time of SDA and SCL, receiving (Fast Mode)",
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          "name": "Fall time of SDA and SCL, receiving (Fast Mode)",
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          "name": "Fall time of SDA and SCL, receiving (Fast Mode Plus)",
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        {
          "name": "Supply voltage (absolute maximum)",
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          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
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        },
        {
          "name": "Voltage at any input pin (absolute maximum)",
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