QFPs are high-density, surface-mount packages with leads protruding
on all four sides of the package. The QFP has the most variations
of any package type and must be carefully specified for adapters.
Ceramic Quad Flat Pack (CQFP): General characteristics are
similar to PQFP, but the body size can differ substantially.
Metal Quad Flat Pack ( MQFP): Package material is metal
and the body size varies from PQFP and CQFP.
Thin Quad Flat Pack (TQFP): A variant of the QFP package type
with a body thickness of 2mm or less.
Very (small) Quad Flat Pack (VQFP): Same as TQFP.