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I'm working on hacking the MCU in my MLP4DSM radio for an RC helicopter. The model number on the MCU is scratched out, but I can clearly read MEGA without an AT at the beginning. Google is letting me down. However, I can find AVRs marked either way scrolling through Google images. Whats the difference?

ATmega328P-AU Mega328P-AU

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Differences between chips of the same model exist only when the revision changes, the logo doesn't play a part.

This is probably just a marketing decision like AVR studio toolchain that has been renamed to Atmel studio or the logo change from

enter image description here

to

enter image description here

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  • \$\begingroup\$ Does that mean newer chips are marked 'mega' and older chips are marked 'atmega'? Getting an idea of the year this changed might help me narrow down the chips. \$\endgroup\$ – OhmArchitect Jan 12 '14 at 15:53
  • \$\begingroup\$ @OhmArchitect The logo change was in the middle of 2012 but I'm not sure how the logo affected the markings on chips (if it did). \$\endgroup\$ – alexan_e Jan 12 '14 at 16:09
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    \$\begingroup\$ @OhmArchitect - The markings on the images you posted indicate that the chips were manufactured only one week apart - weeks 9 and 10 of 2007. It's hard to believe in such a coincidence. Another possibility is that one of them is a counterfeit (see this question and answers). \$\endgroup\$ – Ricardo Jan 12 '14 at 17:12
  • \$\begingroup\$ @Ricardo: I believe you have the date codes backwards. \$\endgroup\$ – Ignacio Vazquez-Abrams Jan 12 '14 at 17:29
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    \$\begingroup\$ @OhmArchitect Date Code Management Atmel date codes are typically in the format "YYWW", whereby, "YY" corresponds to the last two digits of the year and "WW" indicates the workweek. So the chips are 7th week of 2009 and 47th week of 2010 \$\endgroup\$ – alexan_e Jan 12 '14 at 17:31

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