What's the A?

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Was looking at chips, and noticed that the "ATTiny84A" is significantly cheaper than the "ATTiny84", but I can't find actual spec differences.

 

So for instance, on Microchip's page:

 

Product Pins Flash (KB) SRAM (B) Price 5K

ATtiny24 14 2 128 $1.15

ATtiny24A 14 2 128 $0.48

ATtiny44 14 4 256 $1.20

ATtiny44A 14 4 256 $0.51

ATtiny84 14 8 512 $1.39

ATtiny84A 14 8 512 $0.56

But I can't find an actual spec difference to explain why it costs half as much, and now I'm curious.

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Last Edited: Tue. Dec 8, 2020 - 04:46 AM
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The A version of chips are newer and possibly with a smaller die as far as I know.

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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Which package?

Reason : some are assembled at Microchip

How to search for Microchip PCNs

 

"Dare to be naïve." - Buckminster Fuller

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"A" stands for Around half price

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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As other says A usually means "die shrink" to a reduced geometry fabrication process. More chips per wafer means cheaper. Usually they are supposed to be functionally identical but the smaller geometry can reduce power consumption but can also increase noise susceptibility.

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Did you look for a migration app note to determine differences in practice?

AVR526: Migrating from ATtiny24/44/84 to ATtiny24A/44A/84A. 1 Introduction. In order to optimize the manufacturing process and to further reduce current consumption, an optimized version of ATtiny24/44/84 has been ...

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

Last Edited: Mon. Dec 7, 2020 - 12:44 PM
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I didn't, because I didn't know such a thing might exist. I just tried the product-comparison tool on Microchip's site, which didn't mention any differences.

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the_real_seebs wrote:
I didn't, because I didn't know such a thing might exist.
If I go here:

 

 

 

then part way down the page I see:

 

 

For using any devices it's probably worth visiting the product page and looking through available documents. For example - also in that list is:

 

 

I'm guessing that one is a "MUST READ" ! ;-)