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| PartNumber | ATMEGA164P20PU | ATMEGA164P20AU | ATMEGA164P20MU |
| Description | RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 20MHz, CMOS, PDIP40 | RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 20MHz, CMOS, PQFP44 | 8-BIT AVR MICROCONTROLLER WITH 16K BYTES IN SYSTEM PROGRAMMABLE FLASH 7 X 7 MM, 1.00 MM HEIGHT, 0.50 MM PITCH, GREEN, VQFN-44 |