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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

Ricardo
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OhmArchitect
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1 Answers1

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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

alexan_e
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  • 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. – OhmArchitect Jan 12 '14 at 15:53
  • @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). – alexan_e Jan 12 '14 at 16:09
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    @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](http://electronics.stackexchange.com/q/90692/29792)). – Ricardo Jan 12 '14 at 17:12
  • @Ricardo: I believe you have the date codes backwards. – Ignacio Vazquez-Abrams Jan 12 '14 at 17:29
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    @OhmArchitect [Date Code Management](http://www.atmel.com/about/quality/faq.aspx#body_12) `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 – alexan_e Jan 12 '14 at 17:31
  • @IgnacioVazquez-Abrams: Right! My mistake. The chips were manufactured almost 2 years apart. – Ricardo Jan 12 '14 at 17:42