MICROCHIP ATMEGA328-PU 8-bit AVR Microcontroller, 20MHz, 32KB, DIP-28
MICROCHIP ATMEGA328-PU 8-bit AVR microcontroller. 20MHz, 32KB flash, 23 I/O. Features I2C, SPI, UART & touch support. DIP-28 package.
The MICROCHIP ATMEGA328-PU is a low-power, high-performance CMOS 8-bit microcontroller built on the enhanced AVR RISC architecture. By executing powerful instructions in a single clock cycle, it achieves throughputs approaching 1 MIPS per MHz, allowing system designers to finely balance power consumption against processing speed to suit a wide range of applications.
This versatile microcontroller boasts a comprehensive feature set, including 131 powerful instructions, 32 x 8 general-purpose working registers, and fully static operation. It delivers up to 20 MIPS throughput at its maximum clock frequency of 20MHz. Memory features include 32KB of in-system programmable flash with 10,000 write/erase cycles, 1KB of EEPROM, and 2KB of SRAM, supported by an optional boot code section with independent lock bits for enhanced security.
A key strength is its rich set of integrated peripherals. It includes two 8-bit timer/counters, one 16-bit timer/counter with capture mode, a real-time counter with a separate oscillator, and six PWM channels for precise control. Communication is facilitated by a programmable serial USART, a Serial Peripheral Interface (SPI), and a byte-oriented 2-wire serial interface (I2C). For analogue sensing, it features a 10-bit ADC with up to 6 channels and an on-chip analogue comparator.
The microcontroller also supports advanced features such as a programmable watchdog timer, interrupt and wake-up on pin change, and power-on reset with programmable brown-out detection. Notably, it includes support for the Atmel QTouch library, enabling the implementation of capacitive touch buttons, sliders, and wheels with QTouch and QMatrix acquisition across up to 64 sense channels.
Housed in a robust 28-pin DIP (Dual In-line Package), it is designed for through-hole mounting, making it an ideal choice for prototyping, educational projects, and embedded systems where reliability and ease of integration are paramount.
- Embedded system design and prototyping
- DIY electronics and maker projects
- Educational boards and learning kits
- Consumer electronics control systems
- Device Core: AVR
- Operating Frequency Max: 20MHz
- Program Memory Size: 32KB
- RAM Memory Size: 2KB
- EEPROM Memory Size: 1KB
- No. of Pins: 28 Pins
- IC Case / Package: DIP (Dual In-line Package)
- No. of I/O's: 23 I/O's
- Interfaces: I2C, SPI, UART
- ADC Channels: 6 Channels
- ADC Resolution: 10-Bit
- Supply Voltage Range: 1.8V to 5.5V
- Operating Temperature Range: -40°C to 85°C
- IC Mounting: Through Hole
- MCU Family: AVR ATmega
- MCU Series: ATmega328
- On-chip 2-cycle multiplier
- Write/Erase Cycles: 10,000 flash / 100,000 EEPROM
- In-system programming by on-chip boot program
- Programming lock for software security
- Six PWM channels
- On-chip analogue comparator
- Power-on reset and programmable brown-out detection
- Dimensions: 33mm (Width) x 43mm (Height) x 15mm (Depth)
- Weight: 4.173 grams
- of Pins: 28Pins
- of I/O's: 23I/O's
- Supply Voltage Min: 1.8V
- Supply Voltage Max: 5.5V
- Operating Temperature Min: -40°C
- Operating Temperature Max: 85°C
- SVHC: No SVHC (04-Feb-2026)
Always follow local regulations and product guidance.
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