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ATMEGA328-AUR

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

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ATMEGA328-AUR

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · TQFP-32(7x7)

ATMEGA328-AUR 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 bi-directional I/O with internal pull-up, alternate functions INT1, OC2B and PCINT19.
2 PD4 bidirectional Port D bit 4 bi-directional I/O with internal pull-up, alternate functions XCK, T0 and PCINT20.
3 GND power_in Ground.
4 VCC power_in Digital supply voltage.
5 GND power_in Ground.
6 VCC power_in Digital supply voltage.
7 PB6 bidirectional Port B bit 6 I/O that can serve as input to the inverting oscillator amplifier (XTAL1) or TOSC1 for Timer/Counter2, with PCINT6.
8 PB7 bidirectional Port B bit 7 I/O that can serve as output of the inverting oscillator amplifier (XTAL2) or TOSC2 for Timer/Counter2, with PCINT7.
9 PD5 bidirectional Port D bit 5 bi-directional I/O with internal pull-up, alternate functions T1, OC0B and PCINT21.
10 PD6 bidirectional Port D bit 6 bi-directional I/O with internal pull-up, alternate functions AIN0 (comparator positive input), OC0A and PCINT22.
11 PD7 bidirectional Port D bit 7 bi-directional I/O with internal pull-up, alternate functions AIN1 (comparator negative input) and PCINT23.
12 PB0 bidirectional Port B bit 0 bi-directional I/O with internal pull-up, alternate functions ICP1, CLKO and PCINT0.
13 PB1 bidirectional Port B bit 1 bi-directional I/O with internal pull-up, alternate functions OC1A and PCINT1.
14 PB2 bidirectional Port B bit 2 bi-directional I/O with internal pull-up, alternate functions SS, OC1B and PCINT2.
15 PB3 bidirectional Port B bit 3 bi-directional I/O with internal pull-up, alternate functions MOSI, OC2A and PCINT3.
16 PB4 bidirectional Port B bit 4 bi-directional I/O with internal pull-up, alternate functions MISO and PCINT4.
17 PB5 bidirectional Port B bit 5 bi-directional I/O with internal pull-up, alternate functions SCK and PCINT5.
18 AVCC power_in Supply voltage for the A/D converter, PC3:0 and ADC7:6; must be connected to VCC even if the ADC is not used, via 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 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 only), powered from the analog supply.
23 PC0 bidirectional Port C bit 0 bi-directional I/O with internal pull-up, alternate functions ADC0 and PCINT8 (uses analog power).
24 PC1 bidirectional Port C bit 1 bi-directional I/O with internal pull-up, alternate functions ADC1 and PCINT9 (uses analog power).
25 PC2 bidirectional Port C bit 2 bi-directional I/O with internal pull-up, alternate functions ADC2 and PCINT10 (uses analog power).
26 PC3 bidirectional Port C bit 3 bi-directional I/O with internal pull-up, alternate functions ADC3 and PCINT11 (uses analog power).
27 PC4 bidirectional Port C bit 4 bi-directional I/O with internal pull-up, alternate functions ADC4, SDA (2-wire data) and PCINT12 (uses digital power VCC).
28 PC5 bidirectional Port C bit 5 bi-directional I/O with internal pull-up, alternate functions ADC5, SCL (2-wire clock) and PCINT13 (uses digital power VCC).
29 PC6/RESET input Reset input (active low, longer than minimum pulse length generates a reset) when RSTDISBL fuse is unprogrammed, otherwise I/O PC6 with PCINT14; electrical characteristics differ from other Port C pins.
30 PD0 bidirectional Port D bit 0 bi-directional I/O with internal pull-up, alternate functions RXD (USART input) and PCINT16.
31 PD1 bidirectional Port D bit 1 bi-directional I/O with internal pull-up, alternate functions TXD (USART output) and PCINT17.
32 PD2 bidirectional Port D bit 2 bi-directional I/O with internal pull-up, alternate functions INT0 and PCINT18.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-32(7x7)
Category Single Chip Microcomputer/Microcontroller
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
Operating Temperature (absolute maximum) -55 125 °C 308
Storage Temperature -65 150 °C 308
Voltage on any pin except RESET with respect to Ground -0.5 0.5 V -0.5V to VCC+0.5V; max is VCC+0.5V, printed as an offset to VCC 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
Supply Voltage VCC 1.8 5.5 V TA = -40C to 85C 308
Operating Temperature (industrial) TA -40 85 °C Industrial 634
Speed 20 MHz 1.8 - 5.5V, see Figure 29-1 634

CAD (KiCad official)

  • Symbol: ATMEGA328-AUR
  • Footprint: Package_QFP:TQFP-32_7x7mm_P0.8mm
  • 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
  • 3D model files: atmega328-aur-etched.step / atmega328-aur-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega328-aur.step / atmega328-aur.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 2026-10-26, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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