The exposed top face of the IC chip has a plurality of {HEAD ~ contact areas} or pads around {TAIL ~ the periphery} of the chip for connecting the input/output leads of the various circuits within the IC chip to the multilayer circuit board 
The exposed top face of the IC chip has a plurality of { HEAD ~ contact areas } or pads around { TAIL ~ the periphery } of the chip for connecting the input / output leads of the various circuits within the IC chip to the multilayer circuit board
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