ATMEGA328P-PU

{
  "slug": "atmega328p-pu",
  "version": "0.1.1",
  "type": "component",
  "description": "Microchip Tech ATMEL & AVR, DIP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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  "component": {
    "mpn": "ATMEGA328P-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/ATmega48A-PA-88A-PA-168A-PA-328-P-DS-DS40002061B.pdf",
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      "lbr": "atmega328p-pu.lbr"
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    "distributor_links": {
      "lcsc": "C33901",
      "digikey": "ATMEGA328P-PU-ND",
      "mouser": "556-ATMEGA328P-PU"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T04:35:33Z",
      "source": "Component Ocean /api/assign-pns",
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        "pn": "ATMEGA328P-PU-ND",
        "status": "found"
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      "mouser": {
        "pn": "556-ATMEGA328P-PU",
        "status": "found",
        "lifecycle": "Not Recommended for New Designs"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PC6 (RESET/PCINT14)",
        "type": "bidirectional",
        "description": "Port C bit 6 is a reset input when the RSTDISBL fuse is unprogrammed, where a low level longer than the minimum pulse length generates a Reset and shorter pulses are not ensured to reset; with RSTDISBL programmed it is a normal I/O pin."
      },
      {
        "number": "2",
        "name": "PD0 (RXD/PCINT16)",
        "type": "bidirectional",
        "description": "Port D bit 0 is the USART receive data input (RXD) when the USART receiver is enabled, and can also serve as pin change interrupt 16."
      },
      {
        "number": "3",
        "name": "PD1 (TXD/PCINT17)",
        "type": "bidirectional",
        "description": "Port D bit 1 is the USART transmit data output (TXD), configured as an output regardless of DDD1 when the USART transmitter is enabled, and can also serve as pin change interrupt 17."
      },
      {
        "number": "4",
        "name": "PD2 (INT0/PCINT18)",
        "type": "bidirectional",
        "description": "Port D bit 2 can serve as external interrupt source 0 (INT0) and as pin change interrupt 18."
      },
      {
        "number": "5",
        "name": "PD3",
        "type": "bidirectional",
        "description": "Port D bit 3 can serve as external interrupt source 1 (INT1), and as the Timer/Counter2 compare match B output (OC2B) when configured as an output; it can also serve as pin change interrupt 19."
      },
      {
        "number": "6",
        "name": "PD4",
        "type": "bidirectional",
        "description": "Port D bit 4 is the USART external clock input/output (XCK) and the Timer/Counter0 external counter input (T0), and can also serve as pin change interrupt 20."
      },
      {
        "number": "7",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "9",
        "name": "PB6 (XTAL1/TOSC1/PCINT6)",
        "type": "input",
        "description": "Depending on clock selection fuse settings, PB6 is the input to the inverting oscillator amplifier (XTAL1) and to the internal clock circuit; when used as a clock pin it cannot be used as an I/O pin."
      },
      {
        "number": "10",
        "name": "PB7 (XTAL2/TOSC2/PCINT7)",
        "type": "output",
        "description": "Depending on clock selection fuse settings, PB7 is the output of the inverting oscillator amplifier (XTAL2); when used as a clock pin it cannot be used as an I/O pin."
      },
      {
        "number": "11",
        "name": "PD5",
        "type": "bidirectional",
        "description": "Port D bit 5 is the Timer/Counter1 external counter input (T1), and the Timer/Counter0 compare match B output (OC0B) when configured as an output; it can also serve as pin change interrupt 21."
      },
      {
        "number": "12",
        "name": "PD6",
        "type": "bidirectional",
        "description": "Port D bit 6 is the analog comparator positive input (AIN0) and the Timer/Counter0 compare match A output (OC0A) when configured as an output; for AIN0 use, the pin should be configured as input with the pull-up off."
      },
      {
        "number": "13",
        "name": "PD7",
        "type": "bidirectional",
        "description": "Port D bit 7 is the analog comparator negative input (AIN1); configure it as an input with the internal pull-up switched off to avoid interference with the comparator."
      },
      {
        "number": "14",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0 is the Timer/Counter1 input capture input (ICP1) and the divided system clock output (CLKO), and can also serve as pin change interrupt 0."
      },
      {
        "number": "15",
        "name": "PB1 (OC1A/PCINT1)",
        "type": "bidirectional",
        "description": "Port B bit 1 is the Timer/Counter1 compare match A output (OC1A), which requires the pin to be configured as an output (DDB1 set), and can also serve as pin change interrupt 1."
      },
      {
        "number": "16",
        "name": "PB2 (SS/OC1B/PCINT2)",
        "type": "bidirectional",
        "description": "Port B bit 2 is the SPI slave select input (SS) and the Timer/Counter1 compare match B output (OC1B, requires DDB2 set), and can also serve as pin change interrupt 2."
      },
      {
        "number": "17",
        "name": "PB3 (MOSI/OC2A/PCINT3)",
        "type": "bidirectional",
        "description": "Port B bit 3 is the SPI master data output / slave data input (MOSI) and the Timer/Counter2 compare match A output (OC2A, requires DDB3 set), and can also serve as pin change interrupt 3."
      },
      {
        "number": "18",
        "name": "PB4 (MISO/PCINT4)",
        "type": "bidirectional",
        "description": "Port B bit 4 is the SPI master data input / slave data output (MISO), and can also serve as pin change interrupt 4."
      },
      {
        "number": "19",
        "name": "PB5 (SCK/PCINT5)",
        "type": "bidirectional",
        "description": "Port B bit 5 is the SPI master clock output / slave clock input (SCK), and can also serve as pin change interrupt 5."
      },
      {
        "number": "20",
        "name": "AVCC",
        "type": "power_in",
        "description": "AVCC is the supply voltage pin for the A/D converter, PC3:0 and ADC7:6; it should be externally connected to VCC even if the ADC is not used, and connected through a low-pass filter if the ADC is used."
      },
      {
        "number": "21",
        "name": "AREF",
        "type": "input",
        "description": "AREF is the analog reference pin for the A/D converter."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "23",
        "name": "PC0 (ADC0/PCINT8)",
        "type": "bidirectional",
        "description": "Port C bit 0 can be used as ADC input channel 0 (uses analog power) and can also serve as pin change interrupt 8."
      },
      {
        "number": "24",
        "name": "PC1 (ADC1/PCINT9)",
        "type": "bidirectional",
        "description": "Port C bit 1 can be used as ADC input channel 1 (uses analog power) and can also serve as pin change interrupt 9."
      },
      {
        "number": "25",
        "name": "PC2 (ADC2/PCINT10)",
        "type": "bidirectional",
        "description": "Port C bit 2 can be used as ADC input channel 2 (uses analog power) and can also serve as pin change interrupt 10."
      },
      {
        "number": "26",
        "name": "PC3 (ADC3/PCINT11)",
        "type": "bidirectional",
        "description": "Port C bit 3 can be used as ADC input channel 3 (uses analog power) and can also serve as pin change interrupt 11."
      },
      {
        "number": "27",
        "name": "PC4 (ADC4/SDA/PCINT12)",
        "type": "bidirectional",
        "description": "Port C bit 4 is the 2-wire serial interface data I/O (SDA) when TWEN is set, can be used as ADC input channel 4 (uses digital power), and can also serve as pin change interrupt 12."
      },
      {
        "number": "28",
        "name": "PC5 (ADC5/SCL/PCINT13)",
        "type": "bidirectional",
        "description": "Port C bit 5 is the 2-wire serial interface clock (SCL) when TWEN is set, can be used as ADC input channel 5 (uses digital power), and can also serve as pin change interrupt 13."
      }
    ],
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          "extractor flagged: The 28-pin PDIP pinout figure (page 12) is garbled in the text extraction (labelled '28 6PDIP'). Pin; Pin 1 (PC6/RESET) is a dual-function pin: it is a reset input only when the RSTDISBL fuse is unprogr; The datasheet's package for ATMEGA328P-PU is 28P3 (28-lead, 0.300\" wide SPDIP), which matches the DI",
          "14/28 pins cited to the wrong page (name found elsewhere): ['9:PB6 (XTAL1/TOSC1/PCINT6)@p91', '10:PB7 (XTAL2/TOSC2/PCINT7)@p91', '12:PD6 (AIN0/OC0A/PCINT22)@p98', '13:PD7 (AIN1/PCINT23)@p98']"
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        "at": "2026-11-05T04:35:23"
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        "described": 28,
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  "title": "ATMEGA328P-PU",
  "brief": "Microchip Tech ATMEL & AVR, DIP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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