Patent ID: 6027791
Filing Date: 2000-02-22
Classification: H01L,H05K,Y02P,Y10T

Abstract:
A structure for mounting a wiring board in which the wiring board includes a ceramic insulating board, metallized wiring layers arranged on said insulating board, and a plurality of connection terminals mounted on said insulating board and electrically connected to said metallized wiring layer, the wiring board placed on a mother board having wiring conductors formed on the surface of an insulator which contains an organic resin, and the connection terminals of said wiring board are connected by brazing to the wiring conductors of said mother board, wherein parameters L, .DELTA..alpha. and H that define a thermal stress value F1 between the wiring board and the mother board are chosen so that F1 which is defined by the following formula (1):F1=L.times..DELTA..alpha./H.sup.2 ( 1)whereinL is a distance (mm) between the two connection terminals which are most separated away from each other among a plurality of connection terminals mounted on said insulating board,.DELTA..alpha. is a difference in the coefficient of thermal expansion (ppm/.degree.C.) between the insulating board of said wiring board and said mother board at 40 to 400.degree. C., andH is a height (mm) of brazing between said wiring board and said mother board, is not larger than 2000.