2 added 85 characters in body
source | link

You have ATmega328P-AU. Classic Uno with DIP socket has ATmega328P-PU. Arduino Uno SMD has Atmega328P-MU.

The automotive versions ATmega328P-15AZ and ATmega328P-15MZ have separate datasheet starting in Revision History with

Creation of the automotive version starting from industrial version based on the ATmega48P/88P/168P/328P datasheet 8025F-AVR-08/08. Temperature and voltage ranges reflecting automotive requirements.

You have ATmega328P-AU. The automotive versions ATmega328P-15AZ and ATmega328P-15MZ have separate datasheet starting in Revision History with

Creation of the automotive version starting from industrial version based on the ATmega48P/88P/168P/328P datasheet 8025F-AVR-08/08. Temperature and voltage ranges reflecting automotive requirements.

You have ATmega328P-AU. Classic Uno with DIP socket has ATmega328P-PU. Arduino Uno SMD has Atmega328P-MU.

The automotive versions ATmega328P-15AZ and ATmega328P-15MZ have separate datasheet starting in Revision History with

Creation of the automotive version starting from industrial version based on the ATmega48P/88P/168P/328P datasheet 8025F-AVR-08/08. Temperature and voltage ranges reflecting automotive requirements.

1
source | link

You have ATmega328P-AU. The automotive versions ATmega328P-15AZ and ATmega328P-15MZ have separate datasheet starting in Revision History with

Creation of the automotive version starting from industrial version based on the ATmega48P/88P/168P/328P datasheet 8025F-AVR-08/08. Temperature and voltage ranges reflecting automotive requirements.