High Quality Content by WIKIPEDIA articles! A QFP or Quad Flat Package is a surface mount integrated circuit package with leads extending from each of the four sides. Socketing such packages is rare and hole mounting is not possible. Versions ranging from 32 to 304 pins with a pitch ranging from 0.4 to 1.0 mm are common. Other special variants include LQFP (Low profile QFP) and TQFP (Thin QFP).