Difference between SESDU and ESDU, S Prefix

Power Circuit Protection
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1

I have some Reels that have SESDU3121MXT5G written on the onsemi label,
Im wondering if its the same as the ESDU3121MXT5G which DigiKey has in stock.

2

The onsemi website lists the S prefix part as custom. See their link

https://www.onsemi.com/search-results#q=SESDU3121MXT5G&sort=relevancy&f:@languagebysource=[English].

I could not tell you what the differences are.