component
ATTINY861A-SU
Public Made by Adomby adom
Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "ATTINY861A-SU",
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"manufacturer": "Microchip Tech",
"package": "SOIC-20-300mil",
"pin_count": 20,
"category": "Single Chip Microcomputer/Microcontroller",
"subcategory": "Microcontroller Units (MCUs/MPUs/SOCs)",
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"model_3d_plain": "attiny861a-su-etched.glb",
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"lbr": "attiny861a-su.lbr"
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"distributor_links": {
"lcsc": "C94346",
"digikey": "ATTINY861A-SU-ND",
"mouser": "556-ATTINY861A-SU"
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"pn": "556-ATTINY861A-SU",
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{
"number": "1",
"name": "PB0 (MOSI/DI/SDA/OC1A/PCINT8)",
"type": "bidirectional",
"description": "Port B bit 0 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are MOSI/DI/SDA/OC1A/PCINT8."
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{
"number": "2",
"name": "PB1 (MISO/DO/OC1A/PCINT9)",
"type": "bidirectional",
"description": "Port B bit 1 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are MISO/DO/OC1A/PCINT9."
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{
"number": "3",
"name": "PB2 (SCK/USCK/SCL/OC1B/PCINT10)",
"type": "bidirectional",
"description": "Port B bit 2 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are SCK/USCK/SCL/OC1B/PCINT10."
},
{
"number": "4",
"name": "PB3",
"type": "bidirectional",
"description": "Port B bit 3 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are OC1B/PCINT11."
},
{
"number": "5",
"name": "VCC",
"type": "power_in",
"description": "Supply voltage pin."
},
{
"number": "6",
"name": "GND",
"type": "power_in",
"description": "Ground pin."
},
{
"number": "7",
"name": "PB4",
"type": "bidirectional",
"description": "Port B bit 4 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are ADC7/OC1D/CLKI/XTAL1/PCINT12."
},
{
"number": "8",
"name": "PB5",
"type": "bidirectional",
"description": "Port B bit 5 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are ADC8/OC1D/CLKO/XTAL2/PCINT13."
},
{
"number": "9",
"name": "PB6",
"type": "bidirectional",
"description": "Port B bit 6 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are ADC9/INT0/T0/PCINT14."
},
{
"number": "10",
"name": "PB7 (ADC10/RESET/PCINT15)",
"type": "bidirectional",
"description": "Port B bit 7 doubles as the RESET input: a low level longer than the minimum pulse length (Table 19-4) generates a reset, and when reset is disabled the pin can be used as a (weak) I/O pin."
},
{
"number": "11",
"name": "PA7 (ADC6/AIN1/PCINT7)",
"type": "bidirectional",
"description": "Port A bit 7 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC6/AIN1/PCINT7."
},
{
"number": "12",
"name": "PA6 (ADC5/AIN0/PCINT6)",
"type": "bidirectional",
"description": "Port A bit 6 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC5/AIN0/PCINT6."
},
{
"number": "13",
"name": "PA5 (ADC4/AIN2/PCINT5)",
"type": "bidirectional",
"description": "Port A bit 5 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC4/AIN2/PCINT5."
},
{
"number": "14",
"name": "PA4 (ADC3/ICP0/PCINT4)",
"type": "bidirectional",
"description": "Port A bit 4 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC3/ICP0/PCINT4."
},
{
"number": "15",
"name": "AVCC",
"type": "power_in",
"description": "Analog supply for the ADC, analog comparator, BOD, internal voltage reference and Port A; it should be connected to VCC even if the ADC is unused, through a low-pass filter if the ADC is used."
},
{
"number": "16",
"name": "AGND",
"type": "power_in",
"description": "Analog ground pin."
},
{
"number": "17",
"name": "PA3 (AREF/PCINT3)",
"type": "bidirectional",
"description": "Port A bit 3 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are AREF/PCINT3."
},
{
"number": "18",
"name": "PA2 (ADC2/INT1/USCK/SCL/PCINT2)",
"type": "bidirectional",
"description": "Port A bit 2 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC2/INT1/USCK/SCL/PCINT2."
},
{
"number": "19",
"name": "PA1 (ADC1/DO/PCINT1)",
"type": "bidirectional",
"description": "Port A bit 1 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC1/DO/PCINT1."
},
{
"number": "20",
"name": "PA0 (ADC0/DI/SDA/PCINT0)",
"type": "bidirectional",
"description": "Port A bit 0 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC0/DI/SDA/PCINT0."
}
],
"provenance": {
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"primary_model": "claude-haiku-5-5",
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"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
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],
"pages_sent": 22,
"cost_usd": 0.1088,
"at": "2026-10-28T21:26:35"
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"pages": 22,
"sha256": "80d15581b2650413",
"source_tier": "lcsc"
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"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 20,
"cites_pages": true,
"refuses_to_fabricate": true
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"specs": {
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"Package": "SOIC-20-300mil",
"Category": "Single Chip Microcomputer/Microcontroller",
"Pins": "20"
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"name": "Operating temperature (Industrial operational range)",
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