{HEAD ~ The IC chip} is mounted in {TAIL ~ a recessed area} of a housing, which serves as a heat sink and a hermetic seal for the IC chip 
is mounted in
{ HEAD ~ The IC chip } is mounted in { TAIL ~ a recessed area } of a housing , which serves as a heat sink and a hermetic seal for the IC chip
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH