ATmega644PA 8-bit AVR® Microcontrollers

Microchip ATmega644PA 8-bit AVR® CMOS Microcontrollers are low-power and based on the AVR® enhanced RISC architecture. The Atmel ATmega644PA is a powerful 8-bit microcontroller, that offers excellent flexibility and a cost-effective solution to a wide range of embedded control applications.

Types of Microcontrollers - MCU
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Data Bus Width
Maximum Clock Frequency
Program Memory Size
Data RAM Size
ADC Resolution
Number of I/Os
Supply Voltage - Min
Supply Voltage - Max
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Packaging
Microchip Technology 8-bit Microcontrollers - MCU 64kB Flash 4kB EEPROM 86 I/O Pins
Datasheet
1.071In Stock
Min.: 1
Mult.: 1

SMD/SMT TQFP-100 AVR 8 bit 16 MHz 64 kB 8 kB 10 bit 86 I/O 2.7 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU 20 MHz Ind Temp
Datasheet
696In Stock
Min.: 1
Mult.: 1

SMD/SMT TQFP-44 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V
Datasheet
845In Stock
Min.: 1
Mult.: 1

SMD/SMT TQFP-44 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 2.7 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V
Datasheet
1.116In Stock
Min.: 1
Mult.: 1

SMD/SMT VQFN-44 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 2.7 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU 16 MHz, 105C, Green, TQFP
Datasheet
780In Stock
Min.: 1
Mult.: 1

SMD/SMT TQFP-44 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64KB FLSH 2KB EE 4KB RAM-20MHz IND
Datasheet
1.337In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 2.000

SMD/SMT TQFP-44 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Reel, Cut Tape, MouseReel
Microchip Technology 8-bit Microcontrollers - MCU 64K Flash 2K EEPROM 4K SRAM 32 IO Pins
Datasheet
684In Stock
Min.: 1
Mult.: 1

SMD/SMT QFN-44 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU 64K Flash 2K EEPROM 4K SRAM 32 IO Pins
Datasheet
925In Stock
Min.: 1
Mult.: 1

Through Hole PDIP-40 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tube
Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLASH 2K EE 4K SRAM ADC-10MHZ
Datasheet
458In Stock
Min.: 1
Mult.: 1

SMD/SMT TQFP-44 AVR 8 bit 10 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64KB FLSH 2KB EE 4KB SRAM-20MHz, IND
Datasheet
1.925In Stock
Min.: 1
Mult.: 1
Reel: 1.000

SMD/SMT TQFP-64 AVR 8 bit 16 MHz 1.8 V 5.5 V Reel, Cut Tape
Microchip Technology 8-bit Microcontrollers - MCU AVR 64KB FLSH 2KB EE 4KB SRAM-16MHz IND
Datasheet
299In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

SMD/SMT TQFP-64 AVR 8 bit 16 MHz 64 kB 4 kB 10 bit 53 I/O 2.7 V 5.5 V + 85 C Reel, Cut Tape, MouseReel

Microchip Technology 8-bit Microcontrollers - MCU 16 MHz, 85DEG
Datasheet
841In Stock
Min.: 1
Mult.: 1

SMD/SMT QFN-32 AVR 8 bit 16 MHz 64 kB 4 kB 10 bit 27 I/O 2.7 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLSH 4K SRAM 2KB EE 20MHZ 5V
Datasheet
516In Stock
Min.: 1
Mult.: 1

Through Hole PDIP-40 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 2.7 V 5.5 V + 85 C Tube
Microchip Technology 8-bit Microcontrollers - MCU AVR 64KB FLSH 2KB EE 4KB SRAM-16MHZ 5V
Datasheet
148In Stock
1.000Expected 4/20/2026
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

SMD/SMT TQFP-64 AVR 8 bit 16 MHz 64 kB 4 kB 10 bit 53 I/O 4.2 V 5.5 V + 85 C Reel, Cut Tape, MouseReel

Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLASH 2K EE 4K SRAM ADC
Datasheet
25In Stock
Min.: 1
Mult.: 1

SMD/SMT QFN-64 AVR 8 bit 16 MHz 64 kB 4 kB 10 bit 53 I/O 4.5 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLSH 8K SRAM 4KB EE-8MHZ 1.8V IND
Datasheet
1.174In Stock
Min.: 1
Mult.: 1
Reel: 1.500

SMD/SMT TQFP-100 AVR 8 bit 8 MHz 1.8 V 5.5 V Reel, Cut Tape
Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLSH 4K SRAM 2KB EE-20MHZ 5V IND
Datasheet
13In Stock
4.000Expected 2/19/2026
Min.: 1
Mult.: 1
Reel: 2.000

SMD/SMT TQFP-44 AVR 8 bit 20 MHz 2.7 V 5.5 V Reel, Cut Tape
Microchip Technology 8-bit Microcontrollers - MCU 64kB Flash 2kB EEPROM 32 I/O Pins
Datasheet
57In Stock
Min.: 1
Mult.: 1

Through Hole PDIP-40 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 2.7 V 5.5 V + 85 C Tube
Microchip Technology 8-bit Microcontrollers - MCU 20 MHz Ind Temp
Datasheet
93In Stock
Min.: 1
Mult.: 1

SMD/SMT VQFN-44 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU 20 MHz Ind Temp
Datasheet
235In Stock
280Expected 3/19/2026
Min.: 1
Mult.: 1

Through Hole PDIP-40 AVR 8 bit 20 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tube
Microchip Technology 8-bit Microcontrollers - MCU AVR 64K FLASH 2K EE 4K SRAM
Datasheet
200In Stock
Min.: 1
Mult.: 1

SMD/SMT VQFN-44 AVR 8 bit 10 MHz 64 kB 4 kB 10 bit 32 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64KB FLSH 2KB EE 4KB SRAM-20MHz, IND
Datasheet
94In Stock
Min.: 1
Mult.: 1

SMD/SMT TQFP-64 AVR 8 bit 16 MHz 64 kB 4 kB 10 bit 54 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64KB FLSH 2KB EE 4KB SRAM-20MHz, IND
Datasheet
26In Stock
Min.: 1
Mult.: 1

SMD/SMT TQFP-64 AVR 8 bit 16 MHz 64 kB 4 kB 10 bit 54 I/O 1.8 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU 64kB Flash 2kB EEPROM 54 I/O Pins
Datasheet
22In Stock
360Expected 4/16/2026
Min.: 1
Mult.: 1

SMD/SMT TQFP-64 AVR 8 bit 8 MHz 64 kB 4 kB 10 bit 53 I/O 2.7 V 5.5 V + 85 C Tray
Microchip Technology 8-bit Microcontrollers - MCU AVR 64KB FLSH 2KB EE 4KB SRAM-8MHz, IND
Datasheet
11In Stock
MouseReel Available
Min.: 1
Mult.: 1
Reel: 1.000

SMD/SMT TQFP-64 AVR 8 bit 8 MHz 64 kB 4 kB 10 bit 53 I/O 2.7 V 5.5 V + 85 C Reel, Cut Tape, MouseReel