component
ATMEGA32U4RC-AU
Public Made by Adomby adom
Microchip Tech MICROCHIP, TQFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "atmega32u4rc-au",
"title": "ATMEGA32U4RC-AU",
"brief": "Microchip Tech MICROCHIP, TQFP-44(10x10). 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",
"embedded processors & controllers",
"atmega32u4rc-au",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "ATMEGA32U4RC-AU",
"manufacturer": "Microchip Tech",
"package": "TQFP-44(10x10)",
"pin_count": 44,
"category": "Embedded Processors & Controllers",
"subcategory": "MICROCHIP",
"datasheet": "http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7766-8-bit-AVR-ATmega16U4-32U4_Summary.pdf",
"parts": {
"symbol": "atmega32u4rc-au.kicad_sym",
"footprint": "atmega32u4rc-au.kicad_mod",
"model_3d": "atmega32u4rc-au-hero.glb",
"model_3d_plain": "atmega32u4rc-au-etched.glb",
"model_3d_step": "atmega32u4rc-au-etched.step",
"model_3d_step_plain": "atmega32u4rc-au.step",
"lbr": "atmega32u4rc-au.lbr"
},
"distributor_links": {
"lcsc": "C1337120",
"digikey": "ATMEGA32U4RC-AU-ND",
"mouser": "556-ATMEGA32U4RC-AU"
},
"distributor_check": {
"checked_at": "2026-10-30T17:03:58Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATMEGA32U4RC-AU-ND",
"status": "found"
},
"mouser": {
"pn": "556-ATMEGA32U4RC-AU",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "PE6",
"type": "bidirectional",
"description": "Port E bit 6 bidirectional I/O with internal pull-up, alternate functions INT6 and AIN0."
},
{
"number": "2",
"name": "UVCC",
"type": "power_in",
"description": "USB pads internal regulator input supply voltage."
},
{
"number": "3",
"name": "D-",
"type": "bidirectional",
"description": "USB full/low speed negative data line, to be connected to the USB D- connector pin with a serial 22 ohm resistor."
},
{
"number": "4",
"name": "D+",
"type": "bidirectional",
"description": "USB full/low speed positive data line, to be connected to the USB D+ connector pin with a serial 22 ohm resistor."
},
{
"number": "5",
"name": "UGND",
"type": "power_in",
"description": "USB pads ground."
},
{
"number": "6",
"name": "UCAP",
"type": "passive",
"description": "USB pads internal regulator output, to be connected to an external 1uF capacitor."
},
{
"number": "7",
"name": "VBUS",
"type": "power_in",
"description": "USB VBUS monitor input."
},
{
"number": "8",
"name": "PB0",
"type": "bidirectional",
"description": "Port B bit 0 bidirectional I/O with internal pull-up, alternate functions SS and PCINT0."
},
{
"number": "9",
"name": "PB1",
"type": "bidirectional",
"description": "Port B bit 1 bidirectional I/O with internal pull-up, alternate functions PCINT1 and SCLK."
},
{
"number": "10",
"name": "PB2",
"type": "bidirectional",
"description": "Port B bit 2 bidirectional I/O with internal pull-up, alternate functions PDI, PCINT2 and MOSI."
},
{
"number": "11",
"name": "PB3",
"type": "bidirectional",
"description": "Port B bit 3 bidirectional I/O with internal pull-up, alternate functions PDO, PCINT3 and MISO."
},
{
"number": "12",
"name": "PB7",
"type": "bidirectional",
"description": "Port B bit 7 bidirectional I/O with internal pull-up, alternate functions PCINT7, OC0A, OC1C and RTS."
},
{
"number": "13",
"name": "RESET",
"type": "input",
"description": "Active-low reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running."
},
{
"number": "14",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage."
},
{
"number": "15",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "16",
"name": "XTAL2",
"type": "output",
"description": "Output from the inverting oscillator amplifier."
},
{
"number": "17",
"name": "XTAL1",
"type": "input",
"description": "Input to the inverting oscillator amplifier and to the internal clock operating circuit."
},
{
"number": "18",
"name": "PD0",
"type": "bidirectional",
"description": "Port D bit 0 bidirectional I/O with internal pull-up, alternate functions OC0B, SCL and INT0."
},
{
"number": "19",
"name": "PD1",
"type": "bidirectional",
"description": "Port D bit 1 bidirectional I/O with internal pull-up, alternate functions SDA and INT1."
},
{
"number": "20",
"name": "PD2",
"type": "bidirectional",
"description": "Port D bit 2 bidirectional I/O with internal pull-up, alternate functions RXD1 and INT2."
},
{
"number": "21",
"name": "PD3",
"type": "bidirectional",
"description": "Port D bit 3 bidirectional I/O with internal pull-up, alternate functions TXD1 and INT3."
},
{
"number": "22",
"name": "PD5",
"type": "bidirectional",
"description": "Port D bit 5 bidirectional I/O with internal pull-up, alternate functions XCK1 and CTS."
},
{
"number": "23",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "24",
"name": "AVCC",
"type": "power_in",
"description": "Supply voltage for the A/D converter channels; connect to VCC if the ADC is unused, otherwise to VCC through a low-pass filter."
},
{
"number": "25",
"name": "PD4",
"type": "bidirectional",
"description": "Port D bit 4 bidirectional I/O with internal pull-up, alternate functions ICP1 and ADC8."
},
{
"number": "26",
"name": "PD6",
"type": "bidirectional",
"description": "Port D bit 6 bidirectional I/O with internal pull-up, alternate functions T1, OC4D and ADC9."
},
{
"number": "27",
"name": "PD7",
"type": "bidirectional",
"description": "Port D bit 7 bidirectional I/O with internal pull-up, alternate functions T0, OC4D and ADC10."
},
{
"number": "28",
"name": "PB4",
"type": "bidirectional",
"description": "Port B bit 4 bidirectional I/O with internal pull-up, alternate functions PCINT4 and ADC11."
},
{
"number": "29",
"name": "PB5",
"type": "bidirectional",
"description": "Port B bit 5 bidirectional I/O with internal pull-up, alternate functions PCINT5, OC1A, OC4B and ADC12."
},
{
"number": "30",
"name": "PB6",
"type": "bidirectional",
"description": "Port B bit 6 bidirectional I/O with internal pull-up, alternate functions PCINT6, OC1B, OC4B and ADC13."
},
{
"number": "31",
"name": "PC6",
"type": "bidirectional",
"description": "Port C bit 6 bidirectional I/O with internal pull-up, alternate functions OC3A and OC4A."
},
{
"number": "32",
"name": "PC7",
"type": "bidirectional",
"description": "Port C bit 7 bidirectional I/O with internal pull-up, alternate functions ICP3, CLK0 and OC4A."
},
{
"number": "33",
"name": "PE2",
"type": "bidirectional",
"description": "Port E bit 2 bidirectional I/O with internal pull-up, alternate function HWB."
},
{
"number": "34",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage."
},
{
"number": "35",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "36",
"name": "PF7",
"type": "bidirectional",
"description": "Port F bit 7, ADC7 analog input or I/O, also JTAG TDI."
},
{
"number": "37",
"name": "PF6",
"type": "bidirectional",
"description": "Port F bit 6, ADC6 analog input or I/O, also JTAG TDO."
},
{
"number": "38",
"name": "PF5",
"type": "bidirectional",
"description": "Port F bit 5, ADC5 analog input or I/O, also JTAG TMS."
},
{
"number": "39",
"name": "PF4",
"type": "bidirectional",
"description": "Port F bit 4, ADC4 analog input or I/O, also JTAG TCK."
},
{
"number": "40",
"name": "PF1",
"type": "bidirectional",
"description": "Port F bit 1, ADC1 analog input or I/O."
},
{
"number": "41",
"name": "PF0",
"type": "bidirectional",
"description": "Port F bit 0, ADC0 analog input or I/O."
},
{
"number": "42",
"name": "AREF",
"type": "input",
"description": "Analog reference input for the A/D converter."
},
{
"number": "43",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "44",
"name": "AVCC",
"type": "power_in",
"description": "Supply voltage for the A/D converter channels; connect to VCC if the ADC is unused, otherwise to VCC through a low-pass filter."
}
],
"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+vision",
"consensus_model": "claude-opus-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Pin 29/30 ADC alternate function labels are truncated in the figure (ADC...); ADC12/ADC13 inferred f; The datasheet pinout is shared by the 44-pin QFN and TQFP; the TQFP variant (44ML, 'ATmega32U4RC-AU'",
"vision extraction: provenance cannot be text-verified; needs consensus"
],
"pages_sent": 27,
"cost_usd": 0.3839,
"at": "2026-10-30T17:03:47"
},
"datasheet": {
"url": "http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7766-8-bit-AVR-ATmega16U4-32U4_Summary.pdf",
"pages": 27,
"sha256": "65cd582b7eceee5f",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 44,
"described": 44,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
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"file": "atmega32u4rc-au.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
12,
12,
1.1
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "61ecec1147f835d2c9d165c450b1c8d53e65b038f6ca1dac3066a2dfb1bbbb85",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "atmega32u4rc-au-etched.step",
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"footprint_binding": "identity",
"sha256": "cfb1cc1a788f3eb62b82e86971941b849ef0be40e29a565659e4fe0a03648549",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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],
"package_dims": {
"package_code": "44ML",
"source_page": 17,
"e": {
"nom_mm": 0.8,
"range_mm": [
null,
null
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "atmega32u4rc-au.step",
"verdict": "SKIP",
"reasons": [
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],
"by": "factory/package_fit.py"
}
}
},
"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "TQFP-44(10x10)",
"Category": "Embedded Processors & Controllers",
"Pins": "44"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "65cd582b7eceee5fec11150611ed481644d304a8da1cf5c7731b6d021a7a3854",
"rows": [
{
"name": "Power supply voltage (Ordering Information, Power Supply column)",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 2.7,
"typ": null,
"max": 5.5,
"conditions": "ATmega32U4RC-AU, 44ML TQFP package, Ordering Information table",
"source_page": 17,
"source": "datasheet"
},
{
"name": "Operating temperature range (Operation Range, Industrial)",
"symbol": "",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 85,
"conditions": "ATmega32U4RC-AU, Industrial range, Ordering Information table",
"source_page": 17,
"source": "datasheet"
},
{
"name": "Speed grade (clock frequency)",
"symbol": "",
"kind": "recommended_operating",
"unit": "MHz",
"min": null,
"typ": null,
"max": 16,
"conditions": "ATmega32U4RC-AU, Speed column, Ordering Information table",
"source_page": 17,
"source": "datasheet"
},
{
"name": "USB operation from internal RC oscillator temperature range",
"symbol": "",
"kind": "recommended_operating",
"unit": "°C",
"min": 0,
"typ": null,
"max": 40,
"conditions": "USB operation from internal RC oscillator is only guaranteed for this range (Ordering Information note 2; applies to the RC-AU variant)",
"source_page": 17,
"source": "datasheet"
}
]
}
},
"variants": [],
"sections": [
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"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
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],
"discovery_pitch": "ATMEGA32U4RC-AU (Microchip Tech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
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"path": "docs/hero.png"
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"files": [
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"visibility": {
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}
}