Difference between SSU and SSF parts

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John_A_Brown
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Posted by John_A_Brown: Thu. Feb 25, 2021 - 10:36 AM
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I need some more ATTiny44 devices. Farnell have ATTiny44A-SSF, but this product in the past used the SSU part. Am I right in thinking that this is merely a temperature grade difference?

 

Just want some reassurance before I program 200 chips..

Four legs good, two legs bad, three legs stable.

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AVR Microcontrollers, megaAVR and tinyAVR
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meslomp
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Posted by meslomp: Thu. Feb 25, 2021 - 10:50 AM
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I googled on "microchip Attiny44 Attiny44a" and ended up here:

https://www.microchip.com/wwwpro...

 

seems the only difference between the 44 and 44A is lower power consumption.

 

Datasheet shows indeed only difference between SSU and SSF is temperature.

 

 

 

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John_A_Brown
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Posted by John_A_Brown: Thu. Feb 25, 2021 - 11:34 AM (Reply to #2)
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Sorry, the A bit is a red herring, they're both A parts, it was the SSU/SSF suffix I was concerned about.

 

 

Four legs good, two legs bad, three legs stable.

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gchapman
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Posted by gchapman: Thu. Feb 25, 2021 - 04:59 PM (Reply to #3)
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Note the long lead time.

microchipDIRECT tiny44A SOIC

 

"Dare to be naïve." - Buckminster Fuller

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glewis
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Posted by glewis: Thu. Feb 25, 2021 - 05:18 PM
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gchapman wrote:

Note the long lead time.

microchipDIRECT tiny44A SOIC

 

note almost 3000 are in stock.

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meslomp
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Posted by meslomp: Fri. Feb 26, 2021 - 07:46 AM
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John,

 

the SS seems to be the package (SOIC14)

and the U and F are temperature specification differences with the U being -40- +85C  and the F being -40 - +125C.

Normally it means that the device will comply to the basic specifications in the given temperature range.

You might still want to have a quick look in the electrical specification section to see if there is a different column/table indicating different limiting values for the changed temperature.

But in general behavior should be the same for both devices.

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