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