09-27-2019 08:43 AM
I have an old PCB design that uses the XC7K355T-1FF901I and it seems to have gone obsolete. Is there a pin-for-pin compatible part that I can replace it with? It needs to have (mostly) all the same specs and needs to have the same footprint.
Thank you very much
09-27-2019 09:18 AM
why do you say obsolite
Pile of them here at the autherised distributer
09-27-2019 09:26 AM
Unfortunately, there is only 1 in stock in that entire list. I only say obsolete because it's out of stock everywhere and no one seems to be re-stocking it anytime soon.
Another thing I am curious about is, if you open the datasheet and look at the part number descriptions, it seems like this one is missing a character. It needs a V or a G after the FF package type. I've attached the picture from the datasheet.
Thanks for helping!
09-28-2019 01:28 AM
09-28-2019 01:53 AM
As @drjohnsmith has said, it looks like the part number you've specified is one of the rare parts that uses leaded solder. You might want to verify that; while leaded solder is certainly used in some places (I know that the military is rather fond of it) almost any commercial product these days would be lead-free.
If you do need a leaded part, then get in touch with Digikey (or any other distributor). They'll be happy to order some for you, it'll just take a few months. You need to plan your supply chain to take this into account.
09-28-2019 10:14 PM
Thanks again, John. I appreciate your time. Ultimately however, none of those suppliers are on my approved list where I can buy from. Also, 10-12 weeks is quite some time for a lead time. The fact that they are non-stocked leaves me to believe that they are an older part, on their way to obsolescence.
At the end of the day, this design is very old, and while I can possibly wait the 12 weeks, do you (or anyone) know of a newer part that has taken this one's place?
09-29-2019 06:07 AM
09-29-2019 09:24 AM
...do you (or anyone) know of a newer part that has taken this one's place?
UG475 and AR43204 describe pin-compatibility between 7-Series devices.
According to AR43204, “Kintex-7 devices are pin compatible with other Kintex-7 devices in the same package.”
So, according to Table 3-3 in UG475, the XC7K355T, XC7K420T, and XC7K480T are pin-compatible in the FF901 package.
However, “pin-compatible” can have some caveats and exceptions. So, you should carefully compare the package-files for the two pin-compatible devices.
09-29-2019 09:36 AM