SEMICONDUCTOR DEVICE

A semiconductor device comprising a chip having a plurality of electrodes, a lead frame including a plurality of leads, a tape carrier having an insulative base film and a plurality of conductive patterns formed on the base film, one of the conductive patterns being used as a ground line. The electrodes of the chip are electrically connected to the respective leads of the lead frame via the respective conductive patterns of the tape carrier, a molded resin is used for hermetically and integrally sealing at least the chip and the tape carrier, and a conductive pad is arranged in the vicinity of the conductive patterns of the tape carrier and is electrically connected to the ground line to constitute a microstrip circuit.