ATSAMR21E18A-MFT

{
  "schema_version": 1,
  "type": "component",
  "slug": "atsamr21e18a-mft",
  "title": "ATSAMR21E18A-MFT",
  "brief": "Microchip Tech RF Transceiver ICs, QFN-32-EP(5x5). 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",
    "radio frequency chip-antenna",
    "atsamr21e18a-mft",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ATSAMR21E18A-MFT",
    "manufacturer": "Microchip Tech",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "Radio Frequency Chip/Antenna",
    "subcategory": "RF Transceiver ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/c7c0211c7523090bc8117f711dafd68f.pdf",
    "parts": {
      "symbol": "atsamr21e18a-mft.kicad_sym",
      "footprint": "atsamr21e18a-mft.kicad_mod",
      "model_3d": "atsamr21e18a-mft-hero.glb",
      "model_3d_plain": "atsamr21e18a-mft-etched.glb",
      "model_3d_step": "atsamr21e18a-mft-etched.step",
      "model_3d_step_plain": "atsamr21e18a-mft.step",
      "lbr": "atsamr21e18a-mft.lbr"
    },
    "distributor_links": {
      "lcsc": "C2151732",
      "digikey": "ATSAMR21E18A-MFTTR-ND",
      "mouser": "556-ATSAMR21E18A-MFT"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T23:03:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATSAMR21E18A-MFTTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-ATSAMR21E18A-MFT",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "XTAL2",
        "type": "output",
        "description": "Output of the integrated AT86RF233 16 MHz reference oscillator amplifier, with parasitic pin capacitance of 3 pF to be counted as crystal load and a DC level of 0.9 V."
      },
      {
        "number": "2",
        "name": "XTAL1",
        "type": "input",
        "description": "Input of the integrated 16 MHz reference oscillator amplifier (XOSCRF), also used as the input pin when an external reference clock is applied, with a DC level of 0.9 V."
      },
      {
        "number": "3",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Ground for the analog power domain, which should be separated from the digital ground on the PCB."
      },
      {
        "number": "4",
        "name": "VDDANA",
        "type": "power_in",
        "description": "Analog supply voltage of 1.8 V to 3.6 V, decoupled with 100 nF and 10 µF capacitors and optionally isolated from VDD by a ferrite bead."
      },
      {
        "number": "5",
        "name": "AVDD",
        "type": "power_out",
        "description": "Output of the internal analog 1.8 V voltage regulator that must be bypassed with 100 nF capacitors for stable operation."
      },
      {
        "number": "6",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Ground for the analog power domain, which should be separated from the digital ground on the PCB."
      },
      {
        "number": "7",
        "name": "PA06",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDANA supply domain with analog input AIN[6] (function B), EXTINT[6], SERCOM0/PAD[2] and TCC1/WO[0] alternate functions."
      },
      {
        "number": "8",
        "name": "PA07",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDANA supply domain with analog input AIN[7] (function B), EXTINT[7], SERCOM0/PAD[3] and TCC1/WO[1] alternate functions."
      },
      {
        "number": "9",
        "name": "PA08",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with I2C, NMI, SERCOM0/SERCOM2 PAD[0], TCC0/WO[0] and FECTRL[0] alternate functions."
      },
      {
        "number": "10",
        "name": "PA09",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with I2C, EXTINT[9], SERCOM0/SERCOM2 PAD[1], TCC0/WO[1] and FECTRL[1] alternate functions."
      },
      {
        "number": "11",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Ground for the analog power domain, which should be separated from the digital ground on the PCB."
      },
      {
        "number": "12",
        "name": "RFP",
        "type": "passive",
        "description": "Positive side of the differential RF port designed for a 100 Ω differential load, where a DC path to ground or supply is not allowed and the common-mode capacitance to ground must be below 30 pF."
      },
      {
        "number": "13",
        "name": "RFN",
        "type": "passive",
        "description": "Negative side of the differential RF port designed for a 100 Ω differential load, where a DC path to ground or supply is not allowed and the common-mode capacitance to ground must be below 30 pF."
      },
      {
        "number": "14",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Ground for the analog power domain, which should be separated from the digital ground on the PCB."
      },
      {
        "number": "15",
        "name": "PA14",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain that also serves as the XIN input of the main crystal oscillator (XOSC), with EXTINT[14], SERCOM2/PAD[2], TC3/WO[0], FECTRL[4] and GCLK_IO[0] alternate functions."
      },
      {
        "number": "16",
        "name": "PA15",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain that also serves as the XOUT output of the main crystal oscillator (XOSC), with EXTINT[15], SERCOM2/PAD[3], TC3/WO[1], FECTRL[5] and GCLK_IO[1] alternate functions."
      },
      {
        "number": "17",
        "name": "PA16",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with I2C, X[4], SERCOM1/SERCOM3 PAD[0], TCC2/WO[0], TCC0/WO[0] and GCLK_IO[2] alternate functions."
      },
      {
        "number": "18",
        "name": "PA17",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with I2C, EXTINT[1], X[5], SERCOM1/SERCOM3 PAD[1], TCC2/WO[1], TCC0/WO[1] and GCLK_IO[3] alternate functions."
      },
      {
        "number": "19",
        "name": "PA18",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with EXTINT[2], X[6], SERCOM1/SERCOM3 PAD[2], TC3/WO[0], TCC0/WO[2] and AC/CMP[0] alternate functions."
      },
      {
        "number": "20",
        "name": "PA19",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with EXTINT[3], X[7], SERCOM1/SERCOM3 PAD[3], TC3/WO[1], TCC0/WO[3] and AC/CMP[1] alternate functions."
      },
      {
        "number": "21",
        "name": "DVDD",
        "type": "power_out",
        "description": "Output of the internal digital 1.8 V voltage regulator that must be bypassed with 100 nF capacitors for stable operation."
      },
      {
        "number": "22",
        "name": "PA24",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with EXTINT[12], SERCOM3/SERCOM5 PAD[2], TC5/WO[0], TCC1/WO[2] and USB_DM alternate functions."
      },
      {
        "number": "23",
        "name": "PA25",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with EXTINT[13], SERCOM3/SERCOM5 PAD[3], TC5/WO[1], TCC1/WO[3] and USB_DP alternate functions."
      },
      {
        "number": "24",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply voltage of 1.8 V to 3.6 V, decoupled with 100 nF and 10 µF capacitors."
      },
      {
        "number": "25",
        "name": "PA27",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with EXTINT[15], SERCOM3/PAD[0] and GCLK_IO[0] alternate functions."
      },
      {
        "number": "26",
        "name": "RESET",
        "type": "input",
        "description": "Active-low external reset input with an internal pull-up, where the reset low level threshold is below 0.33 × VDDIO at 1.8 V to 2.0 V and below 0.36 × VDDIO at 2.7 V to 3.6 V."
      },
      {
        "number": "27",
        "name": "PA28",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain with EXTINT[8], SERCOM3/PAD[1] and GCLK_IO[0] alternate functions."
      },
      {
        "number": "28",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground connection for the device."
      },
      {
        "number": "29",
        "name": "VDDCORE",
        "type": "power_out",
        "description": "Core supply pin for the internal regulator output, which requires decoupling capacitors close to the device."
      },
      {
        "number": "30",
        "name": "VDDIN",
        "type": "power_in",
        "description": "Input supply voltage for the device, which is part of the single 1.8 V to 3.6 V supply and requires decoupling capacitors close to the pin."
      },
      {
        "number": "31",
        "name": "PA30",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain that carries the SWCLK serial wire debug clock, which needs a 1 kΩ pull-up resistor for reliable operation, with EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0] and GCLK_IO[0] alternate functions."
      },
      {
        "number": "32",
        "name": "PA31",
        "type": "bidirectional",
        "description": "General-purpose I/O on the VDDIO supply domain that carries the SWDIO serial wire debug data pin, with EXTINT[11], SERCOM1/PAD[3] and TCC1/WO[1] alternate functions."
      },
      {
        "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": {
        "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 exposed center pad under the QFN package is not a numbered pin in the datasheet; it is metal, in; Pin 29 VDDCORE is typed power_out because the datasheet table is headed 'VDDCORE From Internal Regul; Pin 8 PA07 is driven low by the chip while the internal startup is incomplete (errata 10, Revision A",
          "exposed pad 33 added from the footprint",
          "3/33 pins cited to the wrong page (name found elsewhere): ['26:RESET@p1115', '29:VDDCORE@p1113', '30:VDDIN@p1112']"
        ],
        "pages_sent": 136,
        "cost_usd": 0.5987,
        "at": "2026-10-28T23:02:52"
      },
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        "pages": 1200,
        "sha256": "1343e1031f25f537",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "QFN-32-EP(5x5)",
      "Category": "Radio Frequency Chip/Antenna",
      "Pins": "33"
    },
    "appearance": {
      "contacts": {
        "quote": "indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. In self-capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor.",
        "page": 871,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
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    "characteristics": {
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          "name": "VDDIO supply voltage",
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          "min": 1.8,
          "typ": null,
          "max": 3.6,
          "conditions": "Powers I/O lines, OSC8M and XOSC; same voltage as VDD",
          "source_page": 20,
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          "min": 1.8,
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          "max": 3.6,
          "conditions": "Powers I/O lines, internal regulator and stacked serial Flash; same voltage as VDD",
          "source_page": 20,
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        },
        {
          "name": "VDDANA supply voltage",
          "symbol": "VDDANA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": 3.6,
          "conditions": "Powers I/O lines, ADC, AC, PTC, OSCULP32K, OSC32K, XOSC32K; same voltage as VDD",
          "source_page": 20,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature range (MFT package grade)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "Package Grade F = -40 - 125°C Matte Sn Plating (suffix F in ATSAMR21E18A-MFT)",
          "source_page": 6,
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        {
          "name": "External crystal frequency range (XOSC)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "MHz",
          "min": 0.4,
          "typ": null,
          "max": 32,
          "conditions": "Crystal oscillator mode, crystal between XIN and XOUT",
          "source_page": 147,
          "source": "datasheet"
        }
      ]
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  "discovery_pitch": "ATSAMR21E18A-MFT (Microchip Tech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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