component
ATMEGA8A-PU
Public Made by Adomby adom
Microchip Tech ATMEL & AVR, DIP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"type": "component",
"slug": "atmega8a-pu",
"title": "ATMEGA8A-PU",
"brief": "Microchip Tech ATMEL & AVR, DIP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
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"atmega8a-pu",
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"component": {
"mpn": "ATMEGA8A-PU",
"manufacturer": "Microchip Tech",
"package": "DIP-28-300mil",
"pin_count": 28,
"category": "Embedded Processors & Controllers",
"subcategory": "ATMEL & AVR",
"datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/ATmega8A-Data-Sheet-DS40001974B.pdf",
"parts": {
"symbol": "atmega8a-pu.kicad_sym",
"footprint": "atmega8a-pu.kicad_mod",
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"lbr": "atmega8a-pu.lbr"
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"distributor_links": {
"lcsc": "C34931",
"digikey": "ATMEGA8A-PU-ND",
"mouser": "556-ATMEGA8A-PU"
},
"distributor_check": {
"checked_at": "2026-10-28T21:58:57Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATMEGA8A-PU-ND",
"status": "found"
},
"mouser": {
"pn": "556-ATMEGA8A-PU",
"status": "found",
"lifecycle": "Not Recommended for New Designs"
}
},
"pins": [
{
"number": "1",
"name": "PC6/RESET",
"type": "input",
"description": "Reset input when the RSTDISBL fuse is unprogrammed: a low level longer than the minimum pulse length (Table 26-3) generates a reset, and shorter pulses are not guaranteed to reset; if RSTDISBL is programmed it is a normal I/O pin with electrical characteristics that differ from other Port C pins."
},
{
"number": "2",
"name": "PD0/RXD",
"type": "bidirectional",
"description": "Port D bit 0 and USART receive data input, which is forced to input when the USART receiver is enabled while its pull-up can still be controlled by PORTD0."
},
{
"number": "3",
"name": "PD1/TXD",
"type": "bidirectional",
"description": "Port D bit 1 and USART transmit data output, which is forced to output whenever the USART transmitter is enabled regardless of DDD1."
},
{
"number": "4",
"name": "PD2/INT0",
"type": "bidirectional",
"description": "Port D bit 2 and external interrupt source 0 input."
},
{
"number": "5",
"name": "PD3/INT1",
"type": "bidirectional",
"description": "Port D bit 3 and external interrupt source 1 input."
},
{
"number": "6",
"name": "PD4/XCK/T0",
"type": "bidirectional",
"description": "Port D bit 4, serving as USART external clock input/output (XCK) and Timer/Counter0 external counter input (T0)."
},
{
"number": "7",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage, operating range 2.7 to 5.5 V per the Features list."
},
{
"number": "8",
"name": "GND",
"type": "power_in",
"description": "Ground reference."
},
{
"number": "9",
"name": "PB6/XTAL1/TOSC1",
"type": "bidirectional",
"description": "Port B bit 6, used as input to the inverting oscillator amplifier (XTAL1) or external clock input depending on clock fuse settings, and as TOSC1 for Timer/Counter2 when asynchronous mode is enabled; when used as a clock pin it cannot be used as I/O."
},
{
"number": "10",
"name": "PB7/XTAL2/TOSC2",
"type": "bidirectional",
"description": "Port B bit 7, used as output of the inverting oscillator amplifier (XTAL2) or as TOSC2 for Timer/Counter2 when asynchronous mode is enabled; when used as a clock pin it cannot be used as I/O."
},
{
"number": "11",
"name": "PD5/T1",
"type": "bidirectional",
"description": "Port D bit 5, serving as external counter source input for Timer/Counter1 (T1)."
},
{
"number": "12",
"name": "PD6/AIN0",
"type": "bidirectional",
"description": "Port D bit 6, serving as Analog Comparator positive input (AIN0); configure as input with internal pull-up off to avoid interference with the comparator."
},
{
"number": "13",
"name": "PD7/AIN1",
"type": "bidirectional",
"description": "Port D bit 7, serving as Analog Comparator negative input (AIN1); configure as input with internal pull-up off to avoid interference with the comparator."
},
{
"number": "14",
"name": "PB0/ICP1",
"type": "bidirectional",
"description": "Port B bit 0, serving as Input Capture pin for Timer/Counter1."
},
{
"number": "15",
"name": "PB1/OC1A",
"type": "bidirectional",
"description": "Port B bit 1, serving as Timer/Counter1 Output Compare A output; the pin must be configured as an output (DDB1 set) to perform this function."
},
{
"number": "16",
"name": "PB2/SS/OC1B",
"type": "bidirectional",
"description": "Port B bit 2, serving as SPI Slave Select input (SS, active low when SPI is a slave) and Timer/Counter1 Output Compare B output (OC1B); as an output it must be configured with DDB2 set."
},
{
"number": "17",
"name": "PB3/MOSI/OC2",
"type": "bidirectional",
"description": "Port B bit 3, serving as SPI master data output or slave data input (MOSI) and Timer/Counter2 Output Compare Match output (OC2); as OC2 it must be configured as an output (DDB3 set)."
},
{
"number": "18",
"name": "PB4/MISO",
"type": "bidirectional",
"description": "Port B bit 4, serving as SPI master data input or slave data output (MISO)."
},
{
"number": "19",
"name": "PB5/SCK",
"type": "bidirectional",
"description": "Port B bit 5, serving as SPI master clock output or slave clock input (SCK)."
},
{
"number": "20",
"name": "AVCC",
"type": "power_in",
"description": "Supply voltage pin for the A/D converter, Port C (3:0) and ADC; it should be externally connected to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used."
},
{
"number": "21",
"name": "AREF",
"type": "input",
"description": "Analog reference pin for the A/D converter."
},
{
"number": "22",
"name": "GND",
"type": "power_in",
"description": "Ground reference."
},
{
"number": "23",
"name": "PC0/ADC0",
"type": "bidirectional",
"description": "Port C bit 0 (7-bit bidirectional I/O with internal pull-ups per bit), also ADC input channel 0 using analog power."
},
{
"number": "24",
"name": "PC1/ADC1",
"type": "bidirectional",
"description": "Port C bit 1, also ADC input channel 1 using analog power."
},
{
"number": "25",
"name": "PC2/ADC2",
"type": "bidirectional",
"description": "Port C bit 2, also ADC input channel 2 using analog power."
},
{
"number": "26",
"name": "PC3/ADC3",
"type": "bidirectional",
"description": "Port C bit 3, also ADC input channel 3 using analog power."
},
{
"number": "27",
"name": "PC4/SDA/ADC4",
"type": "bidirectional",
"description": "Port C bit 4, serving as Two-wire Serial Interface data I/O (SDA) when TWEN is set and as ADC input channel 4, which uses digital power."
},
{
"number": "28",
"name": "PC5/SCL/ADC5",
"type": "bidirectional",
"description": "Port C bit 5, serving as Two-wire Serial Interface clock I/O (SCL) when TWEN is set and as ADC input channel 5, which uses digital power."
}
],
"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: PDIP pin numbers 1-28 were assigned from the order of the PDIP listing on page 9; the text extractio; PC6/RESET is typed as input for the reset function; the datasheet states it is an I/O pin when the R; XTAL1/XTAL2 pins are typed bidirectional as port pins, though their oscillator functions are an inpu",
"15/28 pins cited to the wrong page (name found elsewhere): ['7:VCC@p2', '12:PD6/AIN0@p68', '14:PB0/ICP1@p64', '15:PB1/OC1A@p64']"
],
"pages_sent": 76,
"cost_usd": 0.284,
"at": "2026-10-28T21:58:41"
},
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"pages": 327,
"sha256": "e10f0e392857e034",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
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"described": 28,
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"refuses_to_fabricate": true
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"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "DIP-28-300mil",
"Category": "Embedded Processors & Controllers",
"Pins": "28"
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"characteristics": {
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"rows": [
{
"name": "Operating Temperature",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": -55,
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{
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"source_page": 313,
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{
"name": "Operating Temperature (Industrial)",
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"unit": "°C",
"min": -40,
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"max": 85,
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"source_page": 313,
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{
"name": "Minimum VCC for Power-down",
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{
"name": "Input Low Voltage, except XTAL1 and RESET pins",
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"conditions": "VCC = 2.7V - 5.5V",
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{
"name": "Input Low Voltage, XTAL1 pin",
"symbol": "VIL1",
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"conditions": "VCC = 2.7V - 5.5V",
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{
"name": "Input Low Voltage, RESET pin",
"symbol": "VIL2",
"kind": "electrical",
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"conditions": "VCC = 2.7V - 5.5V",
"source_page": 232,
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{
"name": "Input Low Voltage, RESET pin as I/O",
"symbol": "VIL3",
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"symbol": "VOL",
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"min": null,
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"conditions": "IOL = 10mA, VCC = 3V",
"source_page": 232,
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"name": "Output High Voltage (Ports B,C,D)",
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{
"name": "Reset Pull-up Resistor",
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"symbol": "VACIO",
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{
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