SI4463-B1B-FMR

{
  "schema_version": 1,
  "type": "component",
  "slug": "si4463-b1b-fmr",
  "title": "SI4463-B1B-FMR",
  "brief": "SKYWORKS SILICON LABS RF Transceiver ICs, QFN-20-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",
    "rf and wireless",
    "si4463-b1b-fmr",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "SI4463-B1B-FMR",
    "manufacturer": "SKYWORKS SILICON LABS",
    "package": "QFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "RF And Wireless",
    "subcategory": "RF Transceiver ICs",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588858327040741376",
    "parts": {
      "symbol": "si4463-b1b-fmr.kicad_sym",
      "footprint": "si4463-b1b-fmr.kicad_mod",
      "model_3d": "si4463-b1b-fmr-hero.glb",
      "model_3d_plain": "si4463-b1b-fmr-etched.glb",
      "model_3d_step": "si4463-b1b-fmr-etched.step",
      "model_3d_step_plain": "si4463-b1b-fmr.step",
      "lbr": "si4463-b1b-fmr.lbr"
    },
    "distributor_links": {
      "lcsc": "C22477"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T10:06:17Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "SDN",
        "type": "input",
        "description": "Shutdown input (0 to VDD V digital); SDN must be 0 in all modes except Shutdown, and when SDN = 1 the chip is completely shut down and register contents are lost."
      },
      {
        "number": "2",
        "name": "RXp",
        "type": "input",
        "description": "Differential RF input pin of the LNA; see the application schematic for the example matching network."
      },
      {
        "number": "3",
        "name": "RXn",
        "type": "input",
        "description": "Differential RF input pin of the LNA; see the application schematic for the example matching network."
      },
      {
        "number": "4",
        "name": "TX",
        "type": "output",
        "description": "Transmit output pin; the PA output is an open-drain connection, so the L-C match must supply VDD (+3.3 VDC nominal) to this pin."
      },
      {
        "number": "5",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; not connected internally to any circuitry."
      },
      {
        "number": "6",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply voltage input to internal regulators, +1.8 to +3.6 V; recommended supply voltage is +3.3 V."
      },
      {
        "number": "7",
        "name": "TXRAMP",
        "type": "output",
        "description": "Programmable bias output with ramp capability for an external FET PA; see section 5.4 Transmitter (TX)."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply voltage input to internal regulators, +1.8 to +3.6 V; recommended supply voltage is +3.3 V."
      },
      {
        "number": "9",
        "name": "GPIO0",
        "type": "bidirectional",
        "description": "General purpose digital I/O configurable for functions such as microcontroller clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control; GPIO pins can source up to 5 mA."
      },
      {
        "number": "10",
        "name": "GPIO1",
        "type": "bidirectional",
        "description": "General purpose digital I/O configurable for functions such as microcontroller clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control; GPIO pins can source up to 5 mA."
      },
      {
        "number": "11",
        "name": "nIRQ",
        "type": "output",
        "description": "General microcontroller interrupt status output, set low when an interrupt event occurs; no external pull-up is required but one may be desirable if multiple interrupt lines are connected."
      },
      {
        "number": "12",
        "name": "SCLK",
        "type": "input",
        "description": "Serial clock input for the 4-line serial bus, 0 to VDD V digital input; data is clocked in on positive edge transitions."
      },
      {
        "number": "13",
        "name": "SDO",
        "type": "output",
        "description": "Serial data readback output of the internal control registers, 0 to VDD V digital output."
      },
      {
        "number": "14",
        "name": "SDI",
        "type": "input",
        "description": "Serial data input for the 4-line serial bus, 0 to VDD V digital input."
      },
      {
        "number": "15",
        "name": "nSEL",
        "type": "input",
        "description": "Serial interface select (enable) input for the 4-line serial bus, 0 to VDD V digital input."
      },
      {
        "number": "16",
        "name": "XOUT",
        "type": "output",
        "description": "Crystal oscillator output; connect to an external 25 to 32 MHz crystal, or leave floating when driving XIN from an external source."
      },
      {
        "number": "17",
        "name": "XIN",
        "type": "input",
        "description": "Crystal oscillator input; connect to an external 25 to 32 MHz crystal or to an external source."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Connect to PCB ground."
      },
      {
        "number": "19",
        "name": "GPIO2",
        "type": "bidirectional",
        "description": "General purpose digital I/O configurable for functions such as microcontroller clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control; GPIO pins can source up to 5 mA."
      },
      {
        "number": "20",
        "name": "GPIO3",
        "type": "bidirectional",
        "description": "General purpose digital I/O configurable for functions such as microcontroller clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control; GPIO pins can source up to 5 mA."
      },
      {
        "number": "21",
        "name": "PADDLE_GND",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
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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 is the combined Si4464/63/61/60 family (Rev 1.2). The pin table and 20-pin QFN pinout ; Package size 4x4 mm is not stated directly in the extracted pages (package outline page 49 is not in; Pin 11 (nIRQ) and pin 1 text refer to 'Si4463/61' and the pin numbering diagram text is garbled in e",
          "exposed pad 21 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint",
          "1/21 pins cited to the wrong page (name found elsewhere): ['17:XIN@p47']"
        ],
        "pages_sent": 12,
        "cost_usd": 0.078,
        "at": "2026-10-18T10:04:18"
      },
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        "pages": 56,
        "sha256": "bd05260fa3d56abf",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
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        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
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  "metadata": {
    "specs": {
      "Manufacturer": "SKYWORKS SILICON LABS",
      "Package": "QFN-20-EP(4x4)",
      "Category": "RF And Wireless",
      "Pins": "21"
    },
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          "name": "Output Power Range (Si4464/63)",
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