# What do PA and PU mean in AVR lingo?

My Google-fu is letting me down today.

What do PA and PU mean in ATmega88PA and ATmega8-16PU?

If P for PDIP what is A and U, then?

• Details are at the end of each data sheet. There will be a table with the ordering codes for each package type and another table with descriptions of the package type. There will also be detailed drawings of each package, with dimensions. Reading the data sheet is the only way to be sure you get what you want when ordering parts. Oct 20, 2010 at 21:47

I believe that the AVR codes mean:

• AU - TQFP
• MU - QFN
• PU - DIP
• +1 - An excellent, and to the point, answer: PU => DIP. Thanks. May I offer also MMH(4) => QFN Feb 21, 2015 at 8:24

I think the confusion here is that ATmega88PA is an actual chip. As you can see from the way it's written, "PA" is not a tag-on package code after a dash but a part of the model number. And yes, the information for the package types and codes is in the datasheet under "ordering information".

So, the ATmega8-16PU is an ATmega8, and the ATmega88PA-* are ATmega88PA. I might guess A's are somehow improved (from non-A) devices and P means picopower line.

• yes, that was also the conclusion I came to after researching some more for several hours. Oct 21, 2010 at 17:34
• I found this very useful list of AVR chips with 40 features/parameters: Parametric Product Table for Atmel AVR microcontrollers. It makes it very easy to see how a particular chip is different from similar chips with the same amount of SRAM/flash/EEPROM, for instance, if one chip is specified for a board and the other is the one that can be purchased from a supplier of ICs. Can you incorporate that link (and perhaps a description) into your answer? Oct 21, 2010 at 21:02
• That link seems to be effectively broken now (redirecting to some generic page). Oct 4, 2012 at 22:14
• Seems Atmel has broken their site all around. Nothing new from a company like that. New links are more readable, though, which of course is nice. I updated the ones in my answer.
– XTL
Oct 5, 2012 at 5:36
• The new link for the Parametric Product Table (or rather replacement) is Microcontrollers (MCUs) Selector Feb 27, 2016 at 8:42

This link might help, but it's a little outdated and doesn't seem to mention A and U.