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