component
ATMEGA32U4-AU
Public Made by Adomby adom
Microchip Tech Microcontrollers (MCU/MPU/SOC), QFP-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": "atmega32u4-au",
"title": "ATMEGA32U4-AU",
"brief": "Microchip Tech Microcontrollers (MCU/MPU/SOC), QFP-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",
"atmega32u4-au",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "ATMEGA32U4-AU",
"manufacturer": "Microchip Tech",
"package": "QFP-44(10x10)",
"pin_count": 44,
"category": "Embedded Processors & Controllers",
"subcategory": "Microcontrollers (MCU/MPU/SOC)",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586181634466570240",
"parts": {
"symbol": "atmega32u4-au.kicad_sym",
"footprint": "atmega32u4-au.kicad_mod",
"model_3d": "atmega32u4-au-hero.glb",
"model_3d_plain": "atmega32u4-au-etched.glb",
"model_3d_step": "atmega32u4-au-etched.step",
"model_3d_step_plain": "atmega32u4-au.step",
"lbr": "atmega32u4-au.lbr"
},
"distributor_links": {
"lcsc": "C44854",
"digikey": "ATMEGA32U4-AU-ND"
},
"distributor_check": {
"checked_at": "2026-10-18T18:54:19Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATMEGA32U4-AU-ND",
"status": "found"
},
"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "PE6",
"type": "bidirectional",
"description": "Port E bit 6 I/O with internal pull-up; alternate functions INT.6 and AIN0 (analog comparator positive input)."
},
{
"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, connect to USB D- connector pin through a serial 22 Ohm resistor."
},
{
"number": "4",
"name": "D+",
"type": "bidirectional",
"description": "USB full/low speed positive data line, connect to USB D+ connector pin through 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 supply voltage, connect to an external 1 uF capacitor."
},
{
"number": "7",
"name": "VBUS",
"type": "power_in",
"description": "USB VBUS monitor input."
},
{
"number": "8",
"name": "PB0",
"type": "bidirectional",
"description": "Port B bit 0 I/O with internal pull-up; alternate functions SS (SPI slave select) and PCINT0."
},
{
"number": "9",
"name": "PB1",
"type": "bidirectional",
"description": "Port B bit 1 I/O with internal pull-up; alternate functions SCK (SPI clock) and PCINT1."
},
{
"number": "10",
"name": "PB2",
"type": "bidirectional",
"description": "Port B bit 2 I/O with internal pull-up; alternate functions PDI, MOSI and PCINT2."
},
{
"number": "11",
"name": "PB3",
"type": "bidirectional",
"description": "Port B bit 3 I/O with internal pull-up; alternate functions PDO, MISO and PCINT3."
},
{
"number": "12",
"name": "PB7",
"type": "bidirectional",
"description": "Port B bit 7 I/O with internal pull-up; alternate functions PCINT7, OC0A, OC1C and RTS."
},
{
"number": "13",
"name": "RESET",
"type": "input",
"description": "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 I/O with internal pull-up; alternate functions OC0B, SCL (TWI clock) and INT0."
},
{
"number": "19",
"name": "PD1",
"type": "bidirectional",
"description": "Port D bit 1 I/O with internal pull-up; alternate functions SDA (TWI data) and INT1."
},
{
"number": "20",
"name": "PD2",
"type": "bidirectional",
"description": "Port D bit 2 I/O with internal pull-up; alternate functions RXD1 (USART1 receive) and INT2."
},
{
"number": "21",
"name": "PD3",
"type": "bidirectional",
"description": "Port D bit 3 I/O with internal pull-up; alternate functions TXD1 (USART1 transmit) and INT3."
},
{
"number": "22",
"name": "PD5",
"type": "bidirectional",
"description": "Port D bit 5 I/O with internal pull-up; alternate functions XCK1 (USART1 external clock) 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 not used, otherwise to VCC through a low-pass filter."
},
{
"number": "25",
"name": "PD4",
"type": "bidirectional",
"description": "Port D bit 4 I/O with internal pull-up; alternate functions ICP1 and ADC8."
},
{
"number": "26",
"name": "PD6",
"type": "bidirectional",
"description": "Port D bit 6 I/O with internal pull-up; alternate functions T1, OC4D (complementary) and ADC9."
},
{
"number": "27",
"name": "PD7",
"type": "bidirectional",
"description": "Port D bit 7 I/O with internal pull-up; alternate functions T0, OC4D and ADC10."
},
{
"number": "28",
"name": "PB4",
"type": "bidirectional",
"description": "Port B bit 4 I/O with internal pull-up; alternate functions PCINT4 and ADC11."
},
{
"number": "29",
"name": "PB5",
"type": "bidirectional",
"description": "Port B bit 5 I/O with internal pull-up; alternate functions PCINT5, OC1A, OC4B (complementary) and ADC12."
},
{
"number": "30",
"name": "PB6",
"type": "bidirectional",
"description": "Port B bit 6 I/O with internal pull-up; alternate functions PCINT6, OC1B, OC4B and ADC13."
},
{
"number": "31",
"name": "PC6",
"type": "bidirectional",
"description": "Port C bit 6 I/O with internal pull-up; alternate functions OC3A and OC4A (complementary)."
},
{
"number": "32",
"name": "PC7",
"type": "bidirectional",
"description": "Port C bit 7 I/O with internal pull-up; alternate functions ICP3, CLKO and OC4A."
},
{
"number": "33",
"name": "PE2",
"type": "bidirectional",
"description": "Port E bit 2 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 I/O or ADC7 analog input; JTAG TDI, with pull-up active even during reset when JTAG is enabled."
},
{
"number": "37",
"name": "PF6",
"type": "bidirectional",
"description": "Port F bit 6 I/O or ADC6 analog input; JTAG TDO."
},
{
"number": "38",
"name": "PF5",
"type": "bidirectional",
"description": "Port F bit 5 I/O or ADC5 analog input; JTAG TMS, with pull-up active even during reset when JTAG is enabled."
},
{
"number": "39",
"name": "PF4",
"type": "bidirectional",
"description": "Port F bit 4 I/O or ADC4 analog input; JTAG TCK, with pull-up active even during reset when JTAG is enabled."
},
{
"number": "40",
"name": "PF1",
"type": "bidirectional",
"description": "Port F bit 1 I/O or ADC1 analog input."
},
{
"number": "41",
"name": "PF0",
"type": "bidirectional",
"description": "Port F bit 0 I/O or ADC0 analog input."
},
{
"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 not used, 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-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 pin figure text was extracted without explicit number-to-name pairs. The numbering was inferred ; The provided text does not describe the HWB (hardware boot entrance) function of PE2, so the descrip; Port B and Port D pin descriptions are abbreviated from the alternate-function tables. Electrical li",
"25/44 pins cited to the wrong page (name found elsewhere): ['9:PB1@p72', '16:XTAL2@p7', '17:XTAL1@p7', '18:PD0@p77']"
],
"pages_sent": 77,
"cost_usd": 0.9041,
"at": "2026-10-18T18:51:44"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586181634466570240",
"pages": 433,
"sha256": "f597eb86aaa7df12",
"source_tier": "lcsc"
},
"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": [
{
"file": "atmega32u4-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": "2026-10-18",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "atmega32u4-au-etched.step",
"role": "eda",
"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": "4b793615193401b133e9481e054e7c097c767c0c276a183f89a1f7cbc9a3e4dd",
"checked": "2026-10-18",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "QFP-44(10x10)",
"Category": "Embedded Processors & Controllers",
"Pins": "44"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "f597eb86aaa7df122bbbbc325b966acc27d550c43249d5e6a46d3f4e4422fbb5",
"rows": [
{
"name": "Input Low Voltage, except XTAL1 and RESET pins (LVTTL)",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "VCC = 2.7V - 5.5V",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Input Low Voltage, XTAL1 pin",
"symbol": "VIL1",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "VCC = 2.7V - 5.5V",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Input Low Voltage, RESET pin",
"symbol": "VIL2",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "VCC = 2.7V - 5.5V",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Output Low Voltage",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.7,
"conditions": "IOL = 10mA, VCC = 5V",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Output Low Voltage",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.5,
"conditions": "IOL = 5mA, VCC = 3V",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Output High Voltage",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 4.2,
"typ": null,
"max": null,
"conditions": "IOH = -10mA, VCC = 5V",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Output High Voltage",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 2.3,
"typ": null,
"max": null,
"conditions": "IOH = -5mA, VCC = 3V",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Input Leakage Current I/O Pin (absolute value)",
"symbol": "IIL",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 1,
"conditions": "VCC = 5.5V, pin low",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Reset Pull-up Resistor",
"symbol": "RRST",
"kind": "electrical",
"unit": "kΩ",
"min": 30,
"typ": null,
"max": 60,
"conditions": "",
"source_page": 378,
"source": "datasheet"
},
{
"name": "I/O Pin Pull-up Resistor",
"symbol": "RPU",
"kind": "electrical",
"unit": "kΩ",
"min": 20,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 378,
"source": "datasheet"
},
{
"name": "Power Supply Current, Active 4MHz",
"symbol": "ICC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 5,
"conditions": "VCC = 3V (ATmega16U4/ATmega32U4)",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Power Supply Current, Active 8MHz",
"symbol": "ICC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 10,
"max": 15,
"conditions": "VCC = 5V (ATmega16U4/ATmega32U4)",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Power Supply Current, Idle 4MHz",
"symbol": "ICC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 2,
"conditions": "VCC = 3V (ATmega16U4/ATmega32U4)",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Power Supply Current, Idle 8MHz",
"symbol": "ICC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 6,
"conditions": "VCC = 5V (ATmega16U4/ATmega32U4)",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Power Supply Current, Power-down mode, WDT enabled",
"symbol": "ICC",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 12,
"conditions": "VCC = 3V, Regulator Disabled",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Power Supply Current, Power-down mode, WDT disabled",
"symbol": "ICC",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 1,
"max": 5,
"conditions": "VCC = 3V, Regulator Disabled",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Analog Comparator Input Offset Voltage",
"symbol": "VACIO",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": null,
"max": 40,
"conditions": "VCC = 5V, Vin = VCC/2",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Analog Comparator Input Leakage Current",
"symbol": "IACLK",
"kind": "electrical",
"unit": "nA",
"min": -50,
"typ": null,
"max": 50,
"conditions": "VCC = 5V, Vin = VCC/2",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Analog Comparator Propagation Delay",
"symbol": "tACID",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 750,
"conditions": "VCC = 2.7V",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Analog Comparator Propagation Delay",
"symbol": "tACID",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 500,
"conditions": "VCC = 4.0V",
"source_page": 379,
"source": "datasheet"
},
{
"name": "Oscillator Frequency",
"symbol": "1/tCLCL",
"kind": "electrical",
"unit": "MHz",
"min": 0,
"typ": null,
"max": 8,
"conditions": "VCC = 2.7-5.5V (External Clock Drive)",
"source_page": 380,
"source": "datasheet"
},
{
"name": "Oscillator Frequency",
"symbol": "1/tCLCL",
"kind": "electrical",
"unit": "MHz",
"min": 0,
"typ": null,
"max": 16,
"conditions": "VCC = 4.5-5.5V (External Clock Drive)",
"source_page": 380,
"source": "datasheet"
},
{
"name": "USB Series resistor (external) tolerance",
"symbol": "Rusb",
"kind": "tolerance",
"unit": "%",
"min": -5,
"typ": null,
"max": 5,
"conditions": "22Ω ±5%",
"source_page": 380,
"source": "datasheet"
},
{
"name": "UCAP external capacitor",
"symbol": "CUCAP",
"kind": "electrical",
"unit": "µF",
"min": null,
"typ": 1,
"max": null,
"conditions": "USB pads internal regulator output capacitor",
"source_page": 380,
"source": "datasheet"
},
{
"name": "UCAP external capacitor tolerance",
"symbol": "CUCAP",
"kind": "tolerance",
"unit": "%",
"min": -20,
"typ": null,
"max": 20,
"conditions": "1µF ±20%",
"source_page": 380,
"source": "datasheet"
},
{
"name": "Brown-out Reset threshold VBOT (BODLEVEL 110)",
"symbol": "VBOT",
"kind": "electrical",
"unit": "V",
"min": 1.8,
"typ": 2,
"max": 2.2,
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