A transistor protects {HEAD ~ the integrated circuit} against {TAIL ~ a surge voltage} from a battery terminal 
against
A transistor protects { HEAD ~ the integrated circuit } against { TAIL ~ a surge voltage } from a battery terminal
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH