Is this chip 0.5mm pin pitch?
I've googled for "altera 144-EQFP" and turned up this PDF. Searched within that document for EQFP and found on page 69 the heading "144-Pin Plastic Enhanced Quad Flat Pack (EQFP)—Wire Bond" with a table of parametric data and an accompanying picture on page 70. The pin pitch is parameter "e", which is "0.50 BSC" (0.5mm pin center to pin center).

The key is to search for the "Supplier Device Package", purported by Digikey.