Here's a breakdown of its key features based on the provided information:

Model: ATMEGA168PA-PU This is the specific model number of the microcontroller.

Architecture: 8-bit AVR The microcontroller is based on the 8-bit AVR (Advanced Virtual RISC) architecture developed by Atmel. AVR microcontrollers are known for their high performance, low power consumption, and rich peripheral features.

Clock Speed: The microcontroller operates at a clock frequency of 20 MHz. Clock speed determines how fast the microcontroller can execute instructions and process data.

Flash Memory: The ATMEGA168PA-PU features 16 kilobytes (16 kB) of on-chip Flash memory for program storage. This memory allows for storing the program code that controls the microcontroller's behavior.

Package Type: DIP-28 (Dual Inline Package) The microcontroller is packaged in a 28-pin Dual Inline Package (DIP), which is a common through-hole package type used for easy prototyping and development. This package format simplifies the process of soldering the microcontroller onto a printed circuit board (PCB).

Peripheral Features: The microcontroller includes a variety of built-in peripheral features such as timers/counters, serial communication interfaces (UART, SPI, I2C), analog-to-digital converters (ADC), PWM (Pulse Width Modulation) channels, and GPIO (General-Purpose Input/Output) pins. These peripherals enhance the microcontroller's capabilities and enable seamless integration into various embedded system designs.

Voltage Range: The operating voltage range of the ATMEGA168PA-PU microcontroller typically varies depending on specific variants and applications, but it's commonly used with both 3.3V and 5V systems.