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ATMEGA328-AU

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Microchip Tech MICROCHIP, TQFP-32(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentembedded processors & controllersatmega328-aufactory-2.0.0extractor-text

Verified ATMEGA328-AU

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, 32 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATMEGA328-AU · TQFP-32(7x7) · 32 pins
  • ✓copper: 32 copper pads, none touching another net
  • ✓datasheet: all 32 pin names found in the 653-page datasheet
  • ✓distributor: lcsc C618731, digikey ATMEGA328-AU-ND, mouser 556-ATMEGA328-AU
  • ✓family: TQFP-32_7x7mm_P0.8mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-aa12s3ju/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: 32 pins = 32 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 32 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atmega328-au.kicad_sym✓ atmega328-au.kicad_mod✓ atmega328-au.step
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ATMEGA328-AU

Microchip Tech · MICROCHIP · TQFP-32(7x7)

ATMEGA328-AU from Microchip Tech, in a TQFP-32(7x7). 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 PD3 bidirectional Port D bit 3 with internal pull-up, also external interrupt INT1, Timer/Counter2 output compare B OC2B, and pin change interrupt PCINT19.
2 PD4 bidirectional Port D bit 4 with internal pull-up, also USART external clock XCK, Timer/Counter0 external counter input T0, and pin change interrupt PCINT20.
3 GND power_in Ground.
4 VCC power_in Digital supply voltage; the device operates from 1.8 to 5.5 V.
5 GND power_in Ground.
6 VCC power_in Digital supply voltage; the device operates from 1.8 to 5.5 V.
7 PB6 bidirectional Port B bit 6 used as input to the inverting oscillator amplifier (XTAL1/TOSC1) or external clock input when a clock source is selected, and then cannot be used as an I/O pin; also pin change interrupt PCINT6.
8 PB7 bidirectional Port B bit 7 used as output of the inverting oscillator amplifier (XTAL2/TOSC2) when a crystal is used, and then cannot be used as an I/O pin; also pin change interrupt PCINT7.
9 PD5 bidirectional Port D bit 5 with internal pull-up, also Timer/Counter1 external counter input T1, Timer/Counter0 output compare B OC0B, and pin change interrupt PCINT21.
10 PD6 bidirectional Port D bit 6 with internal pull-up, also analog comparator positive input AIN0, Timer/Counter0 output compare A OC0A, and pin change interrupt PCINT22; use as input with pull-up off when used as AIN0.
11 PD7 bidirectional Port D bit 7 with internal pull-up, also analog comparator negative input AIN1 (configure as input with pull-up off to avoid interference) and pin change interrupt PCINT23.
12 PB0 bidirectional Port B bit 0 with internal pull-up, also Timer/Counter1 input capture ICP1, divided system clock output CLKO, and pin change interrupt PCINT0.
13 PB1 bidirectional Port B bit 1 with internal pull-up, also Timer/Counter1 output compare match A output OC1A and pin change interrupt PCINT1.
14 PB2 bidirectional Port B bit 2 with internal pull-up, also SPI slave select SS, Timer/Counter1 output compare match B output OC1B, and pin change interrupt PCINT2.
15 PB3 bidirectional Port B bit 3 with internal pull-up, also SPI MOSI, Timer/Counter2 output compare match A output OC2A, and pin change interrupt PCINT3.
16 PB4 bidirectional Port B bit 4 with internal pull-up, also SPI master input / slave output MISO and pin change interrupt PCINT4.
17 PB5 bidirectional Port B bit 5 with internal pull-up, also SPI clock SCK (master clock output / slave clock input) and pin change interrupt PCINT5.
18 AVCC power_in Supply voltage pin for the A/D converter, PC3:0 and ADC7:6; it should be connected to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used.
19 ADC6 input Analog input channel 6 of the 10-bit A/D converter (TQFP and VQFN package only), powered from the analog supply.
20 AREF input Analog reference pin for the A/D converter.
21 GND power_in Ground.
22 ADC7 input Analog input channel 7 of the 10-bit A/D converter (TQFP and VQFN package only), powered from the analog supply.
23 PC0 bidirectional Port C bit 0 (7-bit port with internal pull-ups), also ADC input channel 0 using analog power and pin change interrupt PCINT8.
24 PC1 bidirectional Port C bit 1 with internal pull-up, also ADC input channel 1 using analog power and pin change interrupt PCINT9.
25 PC2 bidirectional Port C bit 2 with internal pull-up, also ADC input channel 2 using analog power and pin change interrupt PCINT10.
26 PC3 bidirectional Port C bit 3 with internal pull-up, also ADC input channel 3 using analog power and pin change interrupt PCINT11.
27 PC4 bidirectional Port C bit 4 with internal pull-up, also 2-wire serial data SDA, ADC input channel 4 (uses digital power) and pin change interrupt PCINT12.
28 PC5 bidirectional Port C bit 5 with internal pull-up, also 2-wire serial clock SCL, ADC input channel 5 (uses digital power) and pin change interrupt PCINT13.
29 PC6 bidirectional Port C bit 6 used as reset input when the RSTDISBL fuse is unprogrammed, where a low level longer than the minimum pulse length generates a reset; otherwise it is a normal I/O pin, and also pin change interrupt PCINT14.
30 PD0 bidirectional Port D bit 0 with internal pull-up, used as USART receive data input RXD when the receiver is enabled, and also pin change interrupt PCINT16.
31 PD1 bidirectional Port D bit 1 with internal pull-up, used as USART transmit data output TXD when the transmitter is enabled, and also pin change interrupt PCINT17.
32 PD2 bidirectional Port D bit 2 with internal pull-up, also external interrupt source INT0 and pin change interrupt PCINT18.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-32(7x7)
Category Embedded Processors & Controllers
Pins 32

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 voltage (operational range, ATmega328-AU) VCC 1.8 5.5 V Ordering information: Power Supply 1.8 - 5.5 V, speed 20 MHz, Industrial operational range 634
Maximum frequency (ATmega328-AU speed grade) 20 MHz Ordering information: speed 20 MHz (footnote 3, see Figure 29-1 frequency vs. VCC) 634
Operating temperature (industrial range, ATmega328-AU) -40 85 °C Ordering information: Industrial (-40C to 85C) 634
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

CAD (KiCad official)

  • Symbol: ATMEGA328-AU
  • Footprint: Package_QFP:TQFP-32_7x7mm_P0.8mm
  • 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
  • 3D model files: atmega328-au-etched.step / atmega328-au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega328-au.step / atmega328-au.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