this post was submitted on 03 Nov 2023
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Electrical and Computer Engineering
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Have you tried just setting the search in Digikey to BGAs or CSP chips?
LPC11A04UK,118 claims 2.55x2.55
STM32G071EBY6TR claims 2.3 x 2.4mm
STM32G031Y8Y6TR claims 1.86x2.14mm.
Etc. etc.
All I did was select CSP from 36 pins and less. After that, you look through the "Supplier Device Package" section on the far right and that tends to have the dimensions.
No need to sort: there's only 42 of them. Look through all of them, pick out the ones that are small enough and focus on those.