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ATMEGA328P-PU

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Microchip Tech ATMEL & AVR, DIP-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentembedded processors & controllersatmega328p-pufactory-2.0.0extractor-text

Verified ATMEGA328P-PU

by Ray · last 5 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

5 Nov 2026RayPublished by the parts factory: tier mfr, 28 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATMEGA328P-PU · DIP-28-300mil · 28 pins
  • ✓copper: 28 copper pads, none touching another net
  • ✓datasheet: all 28 pin names found in the 653-page datasheet
  • ✓distributor: lcsc C33901, digikey ATMEGA328P-PU-ND, mouser 556-ATMEGA328P-PU
  • ✓family: DIP-28_W7.62mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-02vii4oa/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 28 pins = 28 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 28 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atmega328p-pu.kicad_sym✓ atmega328p-pu.kicad_mod✓ atmega328p-pu.step
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ATMEGA328P-PU

Microchip Tech · ATMEL & AVR · DIP-28-300mil

ATMEGA328P-PU from Microchip Tech, in a DIP-28-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 PC6 (RESET/PCINT14) bidirectional 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.
2 PD0 (RXD/PCINT16) bidirectional 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.
3 PD1 (TXD/PCINT17) bidirectional 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.
4 PD2 (INT0/PCINT18) bidirectional Port D bit 2 can serve as external interrupt source 0 (INT0) and as pin change interrupt 18.
5 PD3 bidirectional 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.
6 PD4 bidirectional 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.
7 VCC power_in Digital supply voltage.
8 GND power_in Ground.
9 PB6 (XTAL1/TOSC1/PCINT6) input 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.
10 PB7 (XTAL2/TOSC2/PCINT7) output 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.
11 PD5 bidirectional 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.
12 PD6 bidirectional 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.
13 PD7 bidirectional 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.
14 PB0 bidirectional 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.
15 PB1 (OC1A/PCINT1) bidirectional 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.
16 PB2 (SS/OC1B/PCINT2) bidirectional 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.
17 PB3 (MOSI/OC2A/PCINT3) bidirectional 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.
18 PB4 (MISO/PCINT4) bidirectional Port B bit 4 is the SPI master data input / slave data output (MISO), and can also serve as pin change interrupt 4.
19 PB5 (SCK/PCINT5) bidirectional Port B bit 5 is the SPI master clock output / slave clock input (SCK), and can also serve as pin change interrupt 5.
20 AVCC power_in 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.
21 AREF input AREF is the analog reference pin for the A/D converter.
22 GND power_in Ground.
23 PC0 (ADC0/PCINT8) bidirectional Port C bit 0 can be used as ADC input channel 0 (uses analog power) and can also serve as pin change interrupt 8.
24 PC1 (ADC1/PCINT9) bidirectional Port C bit 1 can be used as ADC input channel 1 (uses analog power) and can also serve as pin change interrupt 9.
25 PC2 (ADC2/PCINT10) bidirectional Port C bit 2 can be used as ADC input channel 2 (uses analog power) and can also serve as pin change interrupt 10.
26 PC3 (ADC3/PCINT11) bidirectional Port C bit 3 can be used as ADC input channel 3 (uses analog power) and can also serve as pin change interrupt 11.
27 PC4 (ADC4/SDA/PCINT12) bidirectional 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.
28 PC5 (ADC5/SCL/PCINT13) bidirectional 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.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package DIP-28-300mil
Category Embedded Processors & Controllers
Pins 28

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Power Supply Current, Active mode ICC 0.3 0.5 mA Active 1MHz, VCC = 2V 312
Power Supply Current, Active mode ICC 1.7 2.5 mA Active 4MHz, VCC = 3V 312
Power Supply Current, Active mode ICC 5.2 9 mA Active 8MHz, VCC = 5V 312
Power Supply Current, Idle mode ICC 0.04 0.15 mA Idle 1MHz, VCC = 2V 312
Power Supply Current, Idle mode ICC 0.3 0.7 mA Idle 4MHz, VCC = 3V 312
Power Supply Current, Idle mode ICC 1.2 2.7 mA Idle 8MHz, VCC = 5V 312
Power Supply Current, Power-down mode ICC 4.2 8 µA WDT enabled, VCC = 3V 312
Power Supply Current, Power-down mode ICC 0.1 2 µA WDT disabled, VCC = 3V 312
Supply voltage range (VCC), Industrial operating range VCC 1.8 5.5 V ATmega328P-PU ordering table, Industrial (-40C to 85C) 635
Maximum speed grade frequency 20 MHz Speed grade for ATmega328P-PU, Power Supply 1.8 - 5.5 V; frequency vs VCC per Figure 29-1 635
Operating Temperature -55 125 °C 308
Storage Temperature -65 150 °C 308
Voltage on any pin except RESET with respect to Ground -0.5 V Maximum printed as VCC+0.5V 308
Voltage on RESET with respect to Ground -0.5 13 V 308
DC Current per I/O Pin 40 mA 308
DC Current VCC and GND Pins 200 mA 308
Power Supply Current, Power-save mode ICC 0.8 µA 32kHz TOSC enabled, VCC = 1.8V 312
Power Supply Current, Power-save mode ICC 0.9 µA 32kHz TOSC enabled, VCC = 3V 312

CAD (KiCad official)

  • Symbol: ATMEGA328P-PU
  • Footprint: Package_DIP:DIP-28_W7.62mm
  • 3D model: DIP-28-300mil (KiCad packages3D, STEP)
  • 3D model files: atmega328p-pu-etched.step / atmega328p-pu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega328p-pu.step / atmega328p-pu.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Microchip Tech datasheet (653 pp, sha256 b9b9d83cda56a95d, retrieved 2026-11-05, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF