component
ATSAMD21G18A-AF
Public Made by Adomby adom
Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
Ray
Publish 0.1.0
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{
"slug": "atsamd21g18a-af",
"version": "0.1.0",
"type": "component",
"description": "Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"single chip microcomputer-microcontroller",
"atsamd21g18a-af",
"factory-2.0.0",
"extractor-text"
],
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"atsamd21g18a-af.kicad_sym",
"atsamd21g18a-af.kicad_mod",
"atsamd21g18a-af.glb",
"atsamd21g18a-af.step",
"atsamd21g18a-af.lbr",
"docs/hero.png",
"docs/atsamd21g18a-af-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"atsamd21g18a-af-hero.glb",
"atsamd21g18a-af-hero.overlay.json"
],
"component": {
"mpn": "ATSAMD21G18A-AF",
"manufacturer": "Microchip Tech",
"package": "TQFP-48(7x7)",
"pin_count": 48,
"category": "Single Chip Microcomputer/Microcontroller",
"subcategory": "Microcontroller Units (MCUs/MPUs/SOCs)",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/d70e0a926271e38a2611b8b6dcc19c07.pdf",
"parts": {
"symbol": "atsamd21g18a-af.kicad_sym",
"footprint": "atsamd21g18a-af.kicad_mod",
"model_3d": "atsamd21g18a-af-hero.glb",
"model_3d_plain": "atsamd21g18a-af.glb",
"model_3d_step": "atsamd21g18a-af-etched.step",
"model_3d_step_plain": "atsamd21g18a-af.step",
"lbr": "atsamd21g18a-af.lbr"
},
"distributor_links": {
"lcsc": "C619067",
"digikey": "ATSAMD21G18A-AF-ND",
"mouser": "556-ATSAMD21G18A-AF"
},
"distributor_check": {
"checked_at": "2026-11-13T17:48:50Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATSAMD21G18A-AF-ND",
"status": "found"
},
"mouser": {
"pn": "556-ATSAMD21G18A-AF",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "PA00",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[0]; also XIN32 for the 32kHz crystal oscillator, SERCOM1 PAD[0], TCC2/WO[0]."
},
{
"number": "2",
"name": "PA01",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[1]; also XOUT32 for the 32kHz crystal oscillator, SERCOM1 PAD[1], TCC2/WO[1]."
},
{
"number": "3",
"name": "PA02",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[2], ADC AIN[0], PTC Y[0] and DAC VOUT."
},
{
"number": "4",
"name": "PA03",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[3], ADC/DAC VREFA, ADC AIN[1], PTC Y[1]."
},
{
"number": "5",
"name": "GNDANA",
"type": "power_in",
"description": "Analog ground for the VDDANA domain."
},
{
"number": "6",
"name": "VDDANA",
"type": "power_in",
"description": "Analog supply input powering the analog I/O pins (PA00-PA07, PB00-PB09)."
},
{
"number": "7",
"name": "PB08",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[8], ADC AIN[2], PTC Y[14], SERCOM4 PAD[0], TC4/WO[0]."
},
{
"number": "8",
"name": "PB09",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[9], ADC AIN[3], PTC Y[15], SERCOM4 PAD[1], TC4/WO[1]."
},
{
"number": "9",
"name": "PA04",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[4], ADC VREFB, ADC AIN[4], AC AIN[0], PTC Y[2], SERCOM0 PAD[0]."
},
{
"number": "10",
"name": "PA05",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0 PAD[1]."
},
{
"number": "11",
"name": "PA06",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0 PAD[2]."
},
{
"number": "12",
"name": "PA07",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0 PAD[3], I2S SD[0]."
},
{
"number": "13",
"name": "PA08",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with NMI, ADC AIN[16], PTC X[0], SERCOM0/2 PAD[0], I2S SD[1]; supports I2C."
},
{
"number": "14",
"name": "PA09",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/2 PAD[1], I2S MCK[0]; supports I2C."
},
{
"number": "15",
"name": "PA10",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/2 PAD[2], I2S SCK[0], GCLK_IO[4]."
},
{
"number": "16",
"name": "PA11",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/2 PAD[3], I2S FS[0], GCLK_IO[5]."
},
{
"number": "17",
"name": "VDDIO",
"type": "power_in",
"description": "Digital I/O supply input for the neighbouring I/O pins (paired with GND pin 18)."
},
{
"number": "18",
"name": "GND",
"type": "power_in",
"description": "Digital ground (paired with VDDIO pin 17)."
},
{
"number": "19",
"name": "PB10",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[10], SERCOM4 PAD[2], TC5/WO[0], TCC0/WO[4], I2S MCK[1], GCLK_IO[4]."
},
{
"number": "20",
"name": "PB11",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[11], SERCOM4 PAD[3], TC5/WO[1], TCC0/WO[5], I2S SCK[1], GCLK_IO[5]."
},
{
"number": "21",
"name": "PA12",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[12], SERCOM2/4 PAD[0], TCC2/WO[0], TCC0/WO[6], AC CMP[0]; supports I2C."
},
{
"number": "22",
"name": "PA13",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[13], SERCOM2/4 PAD[1], TCC2/WO[1], TCC0/WO[7], AC CMP[1]; supports I2C."
},
{
"number": "23",
"name": "PA14",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[14]; also XIN for the 0.4-32MHz crystal oscillator, SERCOM2/4 PAD[2], TC3/WO[0], GCLK_IO[0]."
},
{
"number": "24",
"name": "PA15",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[15]; also XOUT for the crystal oscillator, SERCOM2/4 PAD[3], TC3/WO[1], GCLK_IO[1]."
},
{
"number": "25",
"name": "PA16",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[0], PTC X[4], SERCOM1/3 PAD[0], TCC2/WO[0], TCC0/WO[6], GCLK_IO[2]; supports I2C."
},
{
"number": "26",
"name": "PA17",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[1], PTC X[5], SERCOM1/3 PAD[1], TCC2/WO[1], TCC0/WO[7], GCLK_IO[3]; supports I2C."
},
{
"number": "27",
"name": "PA18",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[2], PTC X[6], SERCOM1/3 PAD[2], TC3/WO[0], TCC0/WO[2], AC CMP[0]."
},
{
"number": "28",
"name": "PA19",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[3], PTC X[7], SERCOM1/3 PAD[3], TC3/WO[1], TCC0/WO[3], I2S SD[0], AC CMP[1]."
},
{
"number": "29",
"name": "PA20",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[4], PTC X[8], SERCOM5/3 PAD[2], TC7/WO[0], TCC0/WO[6], I2S SCK[0], GCLK_IO[4]."
},
{
"number": "30",
"name": "PA21",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[5], PTC X[9], SERCOM5/3 PAD[3], TC7/WO[1], TCC0/WO[7], I2S FS[0], GCLK_IO[5]."
},
{
"number": "31",
"name": "PA22",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[6], PTC X[10], SERCOM3/5 PAD[0], TC4/WO[0], TCC0/WO[4], GCLK_IO[6]; supports I2C."
},
{
"number": "32",
"name": "PA23",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[7], PTC X[11], SERCOM3/5 PAD[1], TC4/WO[1], TCC0/WO[5], USB SOF 1kHz, GCLK_IO[7]; supports I2C."
},
{
"number": "33",
"name": "PA24",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[12], SERCOM3/5 PAD[2], TC5/WO[0], TCC1/WO[2], USB DM; no drive strength option, pull-up recommended if unconnected."
},
{
"number": "34",
"name": "PA25",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[13], SERCOM3/5 PAD[3], TC5/WO[1], TCC1/WO[3], USB DP; no drive strength option, pull-up recommended if unconnected."
},
{
"number": "35",
"name": "GND",
"type": "power_in",
"description": "Digital ground (paired with VDDIO pin 36)."
},
{
"number": "36",
"name": "VDDIO",
"type": "power_in",
"description": "Digital I/O supply input (paired with GND pin 35)."
},
{
"number": "37",
"name": "PB22",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[6], SERCOM5 PAD[2], TC7/WO[0], TCC3/WO[0], GCLK_IO[0]."
},
{
"number": "38",
"name": "PB23",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[7], SERCOM5 PAD[3], TC7/WO[1], TCC3/WO[1], GCLK_IO[1]."
},
{
"number": "39",
"name": "PA27",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[15], TCC3/WO[6], GCLK_IO[0]."
},
{
"number": "40",
"name": "RESET",
"type": "input",
"description": "Active-low external reset input."
},
{
"number": "41",
"name": "PA28",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[8], TCC3/WO[7], GCLK_IO[0]."
},
{
"number": "42",
"name": "GND",
"type": "power_in",
"description": "Ground for the VDDIN/core domain."
},
{
"number": "43",
"name": "VDDCORE",
"type": "power_out",
"description": "Regulated output supply of the internal voltage regulator for the core."
},
{
"number": "44",
"name": "VDDIN",
"type": "power_in",
"description": "Input supply for the internal voltage regulator and the PA30/PA31 I/O cluster."
},
{
"number": "45",
"name": "PA30",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[10]; also SWCLK serial wire debug clock, SERCOM1 PAD[2], TCC1/WO[0], TCC3/WO[4]."
},
{
"number": "46",
"name": "PA31",
"type": "bidirectional",
"description": "GPIO on VDDIO supply with EXTINT[11]; also SWDIO serial wire debug data (active only with a debugger), SERCOM1 PAD[3], TCC1/WO[1], TCC3/WO[5]."
},
{
"number": "47",
"name": "PB02",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[2], ADC AIN[10], PTC Y[8], SERCOM5 PAD[0], TC6/WO[0], TCC3/WO[2]."
},
{
"number": "48",
"name": "PB03",
"type": "bidirectional",
"description": "GPIO on VDDANA supply with EXTINT[3], ADC AIN[11], PTC Y[9], SERCOM5 PAD[1], TC6/WO[1], TCC3/WO[3]."
}
],
"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: The pin 30 label is missing from the page 21 pinout text (the 'PA21' label appears at the top of the; The datasheet gives no electrical rating text for the supply pins in the pinout section. VDDCORE is "
],
"pages_sent": 118,
"cost_usd": 0.953,
"at": "2026-11-13T17:48:38"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/d70e0a926271e38a2611b8b6dcc19c07.pdf",
"pages": 1148,
"sha256": "18ca1ccab5aa330f",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 48,
"described": 48,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "atsamd21g18a-af.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
9.0,
9.0,
1.1
],
"zmin_mm": -0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "14ca7676e4932e92f0eca0c6d56ce3018cd28a2531204a70ab7bbacb3eeb3cf5",
"checked": "2026-11-13",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "atsamd21g18a-af-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
9.0,
9.0,
1.1
],
"zmin_mm": -0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "3b471c0edefdcaa25e4dada87bd19eacb821c78bffbfc550bd765ee8cd4f69d5",
"checked": "2026-11-13",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
],
"package_dims": {
"package_code": "Y8",
"source_page": 1069,
"D": {
"nom_mm": 7.0,
"range_mm": [
null,
null
]
},
"E1": {
"nom_mm": 7.0,
"range_mm": [
null,
null
]
},
"E": {
"nom_mm": 9.0,
"range_mm": [
null,
null
]
},
"e": {
"nom_mm": 0.5,
"range_mm": [
null,
null
]
},
"A": {
"nom_mm": 1.2,
"range_mm": [
null,
1.2
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "atsamd21g18a-af.step",
"verdict": "PASS",
"reasons": [
"height and body within the datasheet's package drawing"
],
"by": "factory/package_fit.py"
}
}
}
}