TQFP44 package markings?

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#1
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Ok, I've got marking on an ATMEGA16L-8AC in the TQFP44 package that I haven't seen before (although I've only owned 4 of them). Three of the chips said ATMEL, then ATMEGA16L below that, then 8AC 0XXX below that. Replace the XXX's with any number, its the batch number I'm pretty sure. The fourth one looks just like that, except that below the 8AC part in the middle of the chip there is a capital "I". The datasheet says nothing about this, and I'm pretty sure it can't mean that it is the industrial rated part, since that should be marked as 8AI. All of my parts are the commercial grade. The chip seems to be DOA, so if it is a different version of the chip (though I've never heard of any), it may explain why it isn't working in my application (desoldering that package is going to be fun... I've already lost one board that way).

Thanks!
bluefire211

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I = Incapacitated, apparently. :)

Might be a revision indicator. Try
https://www.avrfreaks.net/phorum/... or https://www.avrfreaks.net/phorum/...

Lee

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Yeah, I apparently had an older version of the datasheet, and didn't have revisions listed out through "I". I got the new one, though I'm really not sure if that "I" is the revision on the chip. I'd be certain if all the others had it. In any case, I think I'm gonna have to go through my first experience of removing one of these (and hopefully not destroying my board). Thanks for the quick reply!

bluefire211

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I've read several ways to easily remove those chips but haven't done them all myself. Just to share the info I'll list the general idea here:

1. Dremel tool, cut all the pins off. If chip is dead, who cares?
2. Slip small wire under the pins of the chip, something maybe like wire wrap. Once the end is out the other side of the chip, solder it to something. Hold the opposite side of the wire and tug on it to put some pressure on the last pin. Heat the solder and pull the wire through to pull it up off the board.
3. Heat pin, lift it with razor
4. Get frustrated, pry off with screwdriver. If you're luckly like I was you won't pull off any of the board traces and you'll still be able to reuse the chip :)

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