PART NO.	PRICE		STOCK	MANUFACTURE	DESCRIPTION	Mounting Style	Package / Case	Maximum Operating Temperature	Packaging	Operating Supply Voltage	Core	Data Bus Width	Maximum Clock Frequency	Processor Series	Program Memory Size	Data RAM Size	ADC Resolution
ATMEGA644A-PU	1+ $4.370 25+ $4.010 100+ $3.630 1000+ $3.480	PDF RFQ	223 In-stock	Atmel / Microchip Technology	8-bit Microcontrollers - MCU 20 MHz Ind Temp	Through Hole	PDIP-40	+ 85 C	Tube	1.8 V to 5.5 V	AVR	8 bit	20 MHz	megaAVR	64 kB	4 kB
ATMEGA644P-20PQ	1+ $5.670 25+ $5.200 100+ $4.710 1000+ $4.510	PDF RFQ	255 In-stock	Atmel / Microchip Technology	8-bit Microcontrollers - MCU AVR 64K FLSH 4K SRAM 2KB EE 20...	Through Hole	PDIP-40	+ 85 C	Tube	2.7 V to 5.5 V	AVR	8 bit	20 MHz	megaAVR	64 kB	4 kB
ATMEGA644P-20PU	1+ $5.560 25+ $5.090 100+ $4.610 1000+ $4.420	PDF RFQ	77 In-stock	Atmel / Microchip Technology	8-bit Microcontrollers - MCU AVR 64K FLSH 4K SRAM 2KB EE 20...	Through Hole	PDIP-40	+ 85 C	Tube	2.7 V to 5.5 V	AVR	8 bit	20 MHz	megaAVR	64 kB	4 kB
ATmega644-20PU	1+ $5.410 25+ $4.960 100+ $4.490 1000+ $4.310	PDF RFQ	130 In-stock	Atmel / Microchip Technology	8-bit Microcontrollers - MCU 64kB Flash 2kB EEPROM 32 I/O Pins	Through Hole	PDIP-40	+ 85 C	Tube	2.7 V to 5.5 V	AVR	8 bit	20 MHz	megaAVR	64 kB	4 kB	10 bit
ATmega644PA-PU	1+ $5.090 25+ $4.660 100+ $4.230 1000+ $4.050	PDF RFQ	3 In-stock	Atmel / Microchip Technology	8-bit Microcontrollers - MCU 64K Flash 2K EEPROM 4K SRAM 32 I...	Through Hole	PDIP-40	+ 85 C	Tube	1.8 V to 5.5 V	AVR	8 bit	20 MHz	megaAVR	64 kB	4 kB