Patent attributes
A semiconductor package that has a superior high frequency characteristics and that can obtain a large area for an internal wiring pattern is provided. According to the present invention, a semiconductor package includes: a multilayer printed wiring board 12, and an IC chip, mounted on the obverse face of the multilayer wiring board 12, and multiple bump terminals 16, mounted on the reverse face. Each bump terminal 16 includes an insulating core 42 having a flat face 40 and a conductive coating deposited on all external surfaces except that of the flat face 40. The end faces of the conductive coatings 44 appear like rings around the insulating cores 42, and are soldered to annular connection pads 52 formed on the reverse face of the multilayer printed wiring board 12. Vias 36 are arranged immediately above the bump terminals 16, and clearance holes 34, the diameter of which is smaller than the diameter of the bump terminals 16, are formed in internal wiring patterns 28 and 30 to permit the passage of the vias 36.
