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