We use an assembly with 2225 1.2uF MLC SM caps mounted on Berquist (aluminium with an insulating coating carrying the copper layers and SM components). We are having problems with the caps cracking and then going s/c in the field. Does anyone have any relevant experience and comments? Is thermal mismatch likely to play a part in this case? Aluminium has a TCE that is about 40% up on copper. I have read the comments earlier this year but would appreciate any further input on eliminating thermal issues as the cause. Terry Davey --------------- [log in to unmask] ----------------------