IEC 60191-6-3:2000 stipulates a method for quad flat packs (QFP) measuring dimensions which are classified into Form E.
IEC 60191-6-3 Ed. 1.0 b:2000
$72.00
Mechanical standardization of semiconductor devices – Part 6-3: General rules for the preparation of outline drawings of surface mounted semiconductor device packages – Measuring methods for package dimensions of quad flat packs (QFP)