IMPROVED TYPE POLYTETRAFLUOROETHYLENE THIN FILM CHIP CARRIER

摘要

PROBLEM TO BE SOLVED: To obtain organic carrier with fast signal rate, low dielectric constant and a fine line circuit by arranging a circuit layer including a line with a specific line width and a specific line distance on a conformal coating with specified flatness and dielectric constant. SOLUTION: A first dielectric layer 22 is arranged on one side surface of a first grounding surface 18 and a second dielectric layer 24 is arranged on one side surface of a second grounding surface 20. A circuit layer 25 is arranged on the first dielectric layer 22. A conformal coating 34 is further arranged on the first dielectric layer 22. The conformal coating 34 has flatness which is larger than about 30% and dielectric constant between about 1.5 and 3.5. A via 38 is formed inside the conformal coating 34. The via 38 is connected to pads 30, 32 and a circuit layer 25. Furthermore, a fine line circuit 40 is further arranged on the conformal coating 34. The fine line circuit 40 includes a line with a line width of 0.025mm (1 mil) or less and a line distance of 0.038mm (1.5 mil) or less.