component
ATSAMR21G18A-MU
Public Made by Adomby adom
Microchip Tech MICROCHIP, QFN-48-EP(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"slug": "atsamr21g18a-mu",
"version": "0.1.0",
"type": "component",
"description": "Microchip Tech MICROCHIP, QFN-48-EP(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"embedded processors & controllers",
"atsamr21g18a-mu",
"factory-2.0.0",
"extractor-text"
],
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"atsamr21g18a-mu.kicad_sym",
"atsamr21g18a-mu.kicad_mod",
"atsamr21g18a-mu.glb",
"atsamr21g18a-mu.step",
"atsamr21g18a-mu.lbr",
"docs/hero.png",
"docs/atsamr21g18a-mu-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"atsamr21g18a-mu-hero.glb",
"atsamr21g18a-mu-hero.overlay.json",
"atsamr21g18a-mu-etched.glb"
],
"component": {
"mpn": "ATSAMR21G18A-MU",
"manufacturer": "Microchip Tech",
"package": "QFN-48-EP(7x7)",
"pin_count": 49,
"category": "Embedded Processors & Controllers",
"subcategory": "MICROCHIP",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/c7c0211c7523090bc8117f711dafd68f.pdf",
"parts": {
"symbol": "atsamr21g18a-mu.kicad_sym",
"footprint": "atsamr21g18a-mu.kicad_mod",
"model_3d": "atsamr21g18a-mu-hero.glb",
"model_3d_plain": "atsamr21g18a-mu-etched.glb",
"model_3d_step": "atsamr21g18a-mu-etched.step",
"model_3d_step_plain": "atsamr21g18a-mu.step",
"lbr": "atsamr21g18a-mu.lbr"
},
"distributor_links": {
"lcsc": "C177175",
"digikey": "ATSAMR21G18A-MU-ND",
"mouser": "556-ATSAMR21G18A-MU"
},
"distributor_check": {
"checked_at": "2026-10-23T12:21:41Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATSAMR21G18A-MU-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "556-ATSAMR21G18A-MU",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "PA00",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA supply; XIN32 32kHz crystal input, EXTINT none, SERCOM1/PAD[0], TCC2/WO[0]."
},
{
"number": "2",
"name": "PA01",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA supply; XOUT32 32kHz crystal output, EXTINT[1], SERCOM1/PAD[1], TCC2/WO[1]."
},
{
"number": "3",
"name": "XTAL2",
"type": "output",
"description": "Output of the AT86RF233 16MHz reference crystal oscillator amplifier (XOSCRF); DC level 0.9V."
},
{
"number": "4",
"name": "XTAL1",
"type": "input",
"description": "Input of the 16MHz reference crystal oscillator amplifier (XOSCRF), also the input for an external clock reference; DC level 0.9V."
},
{
"number": "5",
"name": "GNDANA",
"type": "power_in",
"description": "Ground for the analog power domain."
},
{
"number": "6",
"name": "VDDANA",
"type": "power_in",
"description": "Analog supply, 1.8V to 3.6V, with 100nF and 10µF decoupling (optionally via ferrite bead)."
},
{
"number": "7",
"name": "AVDD",
"type": "power_out",
"description": "Output of the internal analog 1.8V voltage regulator for the radio; requires 100nF bypass capacitor."
},
{
"number": "8",
"name": "GNDANA",
"type": "power_in",
"description": "Ground for the analog power domain."
},
{
"number": "9",
"name": "PA04",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA; EXTINT[4], ADC VREFB/AIN[4], AC AIN[0], PTC Y[2], SERCOM0/PAD[0], TCC0/WO[0]."
},
{
"number": "10",
"name": "PA05",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA; EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0/PAD[1], TCC0/WO[1]."
},
{
"number": "11",
"name": "PA06",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA; EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0/PAD[2], TCC1/WO[0]."
},
{
"number": "12",
"name": "PA07",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA; EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0/PAD[3], TCC1/WO[1]; driven low during internal startup."
},
{
"number": "13",
"name": "VDDIO",
"type": "power_in",
"description": "Digital I/O supply, 1.8V to 3.6V, with 100nF and 10µF decoupling."
},
{
"number": "14",
"name": "GND",
"type": "power_in",
"description": "Digital ground."
},
{
"number": "15",
"name": "PA08",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); NMI, ADC AIN[16], PTC X[0], SERCOM0/PAD[0], SERCOM2/PAD[0], TCC0/WO[0], FECTRL[0]."
},
{
"number": "16",
"name": "PA09",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/PAD[1], SERCOM2/PAD[1], TCC0/WO[1], FECTRL[1]."
},
{
"number": "17",
"name": "GNDANA",
"type": "power_in",
"description": "Ground for the analog power domain."
},
{
"number": "18",
"name": "RFP",
"type": "bidirectional",
"description": "Positive pin of the differential antenna port (TX and RX), designed for 100Ω differential load; no DC path to ground or supply allowed."
},
{
"number": "19",
"name": "RFN",
"type": "bidirectional",
"description": "Negative pin of the differential antenna port (TX and RX), designed for 100Ω differential load; no DC path to ground or supply allowed."
},
{
"number": "20",
"name": "GNDANA",
"type": "power_in",
"description": "Ground for the analog power domain."
},
{
"number": "21",
"name": "PA12",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); EXTINT[12], SERCOM2/PAD[0], TCC2/WO[0], FECTRL[2], AC/CMP[0]."
},
{
"number": "22",
"name": "PA13",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); EXTINT[13], SERCOM2/PAD[1], TCC2/WO[1], FECTRL[3], AC/CMP[1]."
},
{
"number": "23",
"name": "PA14",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; XIN crystal oscillator input, EXTINT[14], SERCOM2/PAD[2], TC3/WO[0], FECTRL[4], GCLK_IO[0]."
},
{
"number": "24",
"name": "PA15",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; XOUT crystal oscillator output, EXTINT[15], SERCOM2/PAD[3], TC3/WO[1], FECTRL[5], GCLK_IO[1]."
},
{
"number": "25",
"name": "PA16",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); PTC X[4], SERCOM1/PAD[0], SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[0], GCLK_IO[2]."
},
{
"number": "26",
"name": "PA17",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); EXTINT[1], PTC X[5], SERCOM1/PAD[1], SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[1], GCLK_IO[3]."
},
{
"number": "27",
"name": "PA18",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[2], PTC X[6], SERCOM1/PAD[2], SERCOM3/PAD[2], TC3/WO[0], TCC0/WO[2], AC/CMP[0]."
},
{
"number": "28",
"name": "PA19",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[3], PTC X[7], SERCOM1/PAD[3], SERCOM3/PAD[3], TC3/WO[1], TCC0/WO[3], AC/CMP[1]."
},
{
"number": "29",
"name": "GND",
"type": "power_in",
"description": "Digital ground."
},
{
"number": "30",
"name": "DVDD",
"type": "power_out",
"description": "Output of the internal digital 1.8V radio voltage regulator; requires 100nF bypass capacitor."
},
{
"number": "31",
"name": "PA22",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); EXTINT[6], PTC X[10], SERCOM3/PAD[0], SERCOM5/PAD[0], TC4/WO[0], TCC0/WO[4], GCLK_IO[6]."
},
{
"number": "32",
"name": "PA23",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO (I2C capable); EXTINT[7], PTC X[11], SERCOM3/PAD[1], SERCOM5/PAD[1], TC4/WO[1], TCC0/WO[5], USB SOF 1kHz, GCLK_IO[7]."
},
{
"number": "33",
"name": "PA24",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC5/WO[0], TCC1/WO[2], USB_DM."
},
{
"number": "34",
"name": "PA25",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC5/WO[1], TCC1/WO[3], USB_DP."
},
{
"number": "35",
"name": "GND",
"type": "power_in",
"description": "Digital ground."
},
{
"number": "36",
"name": "VDDIO",
"type": "power_in",
"description": "Digital I/O supply, 1.8V to 3.6V, with 100nF and 10µF decoupling."
},
{
"number": "37",
"name": "PB22",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[6], SERCOM5/PAD[2], GCLK_IO[0]."
},
{
"number": "38",
"name": "PB23",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[7], SERCOM5/PAD[3], GCLK_IO[1]."
},
{
"number": "39",
"name": "PA27",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[15], SERCOM3/PAD[0], GCLK_IO[0]."
},
{
"number": "40",
"name": "RESET",
"type": "input",
"description": "External reset, active low, with internal pull-up; low level threshold below 0.33*VDDIO (VDDIO 1.8-2.0V) or 0.36*VDDIO (2.7-3.6V)."
},
{
"number": "41",
"name": "PA28",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; EXTINT[8], SERCOM3/PAD[1], GCLK_IO[0]."
},
{
"number": "42",
"name": "GND",
"type": "power_in",
"description": "Digital ground (name not printed in pinout figure; inferred)."
},
{
"number": "43",
"name": "VDDCORE",
"type": "power_out",
"description": "Internal regulator output for the core supply; requires decoupling capacitor."
},
{
"number": "44",
"name": "VDDIN",
"type": "power_in",
"description": "Digital supply input, 1.8V to 3.6V, to the internal voltage regulator."
},
{
"number": "45",
"name": "PA30",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; SWCLK serial wire clock (pull-up 1kΩ recommended), EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], GCLK_IO[0]."
},
{
"number": "46",
"name": "PA31",
"type": "bidirectional",
"description": "General-purpose I/O on VDDIO; SWDIO serial wire bidirectional data (active when debugger present), EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1]."
},
{
"number": "47",
"name": "PB02",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA; EXTINT[2], ADC AIN[10], PTC Y[8], SERCOM5/PAD[0]."
},
{
"number": "48",
"name": "PB03",
"type": "bidirectional",
"description": "General-purpose I/O on VDDANA; EXTINT[3], ADC AIN[11], PTC Y[9], SERCOM5/PAD[1]."
},
{
"number": "49",
"name": "EP",
"type": "power_in",
"description": "Exposed paddle, internally connected to GND; solder to digital ground for mechanical stability, not a replacement for the regular GND pins."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-sonnet-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Pinout figure text is scrambled; pin 42 has no printed name. GND inferred (QFN32 has GND adjacent to; Pins 13 and 14 labels (VDDIO / GND) were read from jumbled figure text; verify order.; Exposed pad has no pin number in the datasheet; '49' assigned by convention.",
"6/49 pins cited to the wrong page (name found elsewhere): ['3:XTAL2@p18', '4:XTAL1@p18', '13:VDDIO@p1113', '30:DVDD@p18']"
],
"pages_sent": 136,
"cost_usd": 0.962,
"at": "2026-10-23T12:21:23"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/c7c0211c7523090bc8117f711dafd68f.pdf",
"pages": 1200,
"sha256": "1343e1031f25f537",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 49,
"described": 49,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "atsamr21g18a-mu.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7.0,
7.0,
0.77
],
"zmin_mm": 0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "f2b38b0b4bf967c77e683e8d4599608b9f0503055ec535b93c4ebb5d0163e916",
"checked": "2026-10-23",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "atsamr21g18a-mu-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7.0,
7.0,
0.77
],
"zmin_mm": 0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "39445e735a5290e572930abc2ff4a8e7b5e4bfdf9628dd6d1af342f1d3edf6df",
"checked": "2026-10-23",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
}
}