component
ATTINY44A-MU
Public Made by Adomby adom
Microchip Tech MICROCHIP, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"slug": "attiny44a-mu",
"version": "0.1.0",
"type": "component",
"description": "Microchip Tech MICROCHIP, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"embedded processors & controllers",
"attiny44a-mu",
"factory-2.0.0",
"extractor-text"
],
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"attiny44a-mu.kicad_sym",
"attiny44a-mu.kicad_mod",
"attiny44a-mu.glb",
"attiny44a-mu.step",
"attiny44a-mu.lbr",
"docs/hero.png",
"docs/attiny44a-mu-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"attiny44a-mu-hero.glb",
"attiny44a-mu-hero.overlay.json",
"attiny44a-mu-etched.glb"
],
"component": {
"mpn": "ATTINY44A-MU",
"manufacturer": "Microchip Tech",
"package": "QFN-20-EP(4x4)",
"pin_count": 21,
"category": "Embedded Processors & Controllers",
"subcategory": "MICROCHIP",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/632b92321ba4773732b4c364a31a8465.pdf",
"parts": {
"symbol": "attiny44a-mu.kicad_sym",
"footprint": "attiny44a-mu.kicad_mod",
"model_3d": "attiny44a-mu-hero.glb",
"model_3d_plain": "attiny44a-mu-etched.glb",
"model_3d_step": "attiny44a-mu-etched.step",
"model_3d_step_plain": "attiny44a-mu.step",
"lbr": "attiny44a-mu.lbr"
},
"distributor_links": {
"lcsc": "C123718",
"digikey": "ATTINY44A-MU-ND",
"mouser": "556-ATTINY44A-MU"
},
"distributor_check": {
"checked_at": "2026-10-30T12:01:22Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATTINY44A-MU-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "556-ATTINY44A-MU",
"status": "found",
"lifecycle": "Not Recommended for New Designs"
}
},
"pins": [
{
"number": "1",
"name": "PA4",
"type": "bidirectional",
"description": "Port A bit 4 with internal pull-up; alternate functions ADC4, USCK/SCL, T1, PCINT4."
},
{
"number": "2",
"name": "PA3",
"type": "bidirectional",
"description": "Port A bit 3 with internal pull-up; alternate functions ADC3, T0, PCINT3."
},
{
"number": "3",
"name": "PA2",
"type": "bidirectional",
"description": "Port A bit 2 with internal pull-up; alternate functions ADC2, AIN1, PCINT2."
},
{
"number": "4",
"name": "PA1",
"type": "bidirectional",
"description": "Port A bit 1 with internal pull-up; alternate functions ADC1, AIN0, PCINT1."
},
{
"number": "5",
"name": "PA0",
"type": "bidirectional",
"description": "Port A bit 0 with internal pull-up; alternate functions ADC0, AREF, PCINT0."
},
{
"number": "6",
"name": "DNC",
"type": "unconnected",
"description": "Do Not Connect."
},
{
"number": "7",
"name": "DNC",
"type": "unconnected",
"description": "Do Not Connect."
},
{
"number": "8",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "9",
"name": "VCC",
"type": "power_in",
"description": "Supply voltage (1.8 - 5.5V operating range)."
},
{
"number": "10",
"name": "DNC",
"type": "unconnected",
"description": "Do Not Connect."
},
{
"number": "11",
"name": "PB0",
"type": "bidirectional",
"description": "Port B bit 0 with internal pull-up; alternate functions XTAL1/CLKI, PCINT8."
},
{
"number": "12",
"name": "PB1",
"type": "bidirectional",
"description": "Port B bit 1 with internal pull-up; alternate functions XTAL2, PCINT9."
},
{
"number": "13",
"name": "PB3",
"type": "input",
"description": "Port B bit 3 / active-low RESET input (low longer than minimum pulse length resets the device) and debugWIRE; usable as weak I/O if RSTDISBL fuse is programmed."
},
{
"number": "14",
"name": "PB2",
"type": "bidirectional",
"description": "Port B bit 2 with internal pull-up; alternate functions INT0, OC0A, CKOUT, PCINT10."
},
{
"number": "15",
"name": "PA7",
"type": "bidirectional",
"description": "Port A bit 7 with internal pull-up; alternate functions ICP, OC0B, ADC7, PCINT7."
},
{
"number": "16",
"name": "PA6",
"type": "bidirectional",
"description": "Port A bit 6 with internal pull-up; alternate functions OC1A, SDA/MOSI/DI, ADC6, PCINT6."
},
{
"number": "17",
"name": "DNC",
"type": "unconnected",
"description": "Do Not Connect."
},
{
"number": "18",
"name": "DNC",
"type": "unconnected",
"description": "Do Not Connect."
},
{
"number": "19",
"name": "DNC",
"type": "unconnected",
"description": "Do Not Connect."
},
{
"number": "20",
"name": "PA5",
"type": "bidirectional",
"description": "Port A bit 5 with internal pull-up; alternate functions ADC5, DO/MISO, OC1B, PCINT5."
},
{
"number": "21",
"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-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 pinout figure text is flattened, so pin-to-number mapping was inferred from the counter-clockwis; The exposed pad has no pin number in the datasheet; 'EP' was used as a label. Its note says only 'sh"
],
"pages_sent": 46,
"cost_usd": 0.389,
"at": "2026-10-30T12:01:08"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/632b92321ba4773732b4c364a31a8465.pdf",
"pages": 286,
"sha256": "8a18a6b9f81ccee8",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 21,
"described": 21,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "attiny44a-mu.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
4.0,
4.0,
0.77
],
"zmin_mm": 0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "attiny44a-mu-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
4.0,
4.0,
0.77
],
"zmin_mm": 0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "cdb59a490ef1844093a9d500c5989932bba94895762fa8097d73865b637bb41a",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
],
"package_dims": {
"package_code": "20M1",
"source_page": 276,
"D": {
"nom_mm": 4.0,
"range_mm": [
null,
null
]
},
"E1": {
"nom_mm": 4.0,
"range_mm": [
null,
null
]
},
"e": {
"nom_mm": 0.5,
"range_mm": [
null,
null
]
},
"A": {
"nom_mm": 0.75,
"range_mm": [
0.7,
0.8
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "attiny44a-mu.step",
"verdict": "PASS",
"reasons": [
"height within the datasheet's package drawing"
],
"by": "factory/package_fit.py"
}
}
}
}