Printed wiring board thickness control for compression connectors used in electronic packaging

An electronic assembly, comprising:

• a printed wiring board having an upper and lower surface with said upper surface having an array of contact pads at least at one region thereof for mounting an electronic module at said region with said region exhibiting less printed wiring board thickness than surrounding regions;
• a layer of stiffening material positioned against said lower surface of said printed wiring board;
• a layer of filler material positioned between said layer of stiffening material and said lower surface of said printed wiring board within said region of said printed wiring board exhibiting said less thickness;
• an electronic module having an array of contact pads;
• an interposer having an array of conductors extending through one surface matching said array of contact pads on said printed wiring board and extending through the other surface matching said array of contact pads on said electronic module;
• and
• means to apply a compressional force between said electronic module and said layer of stiffening material to compress said array of conductors extending through the said other surface of said interposer against said array of contact pads of said electronic module and to compress said array of conductors extending through the said one surface of said interposer against said array of contact pads on said printed wiring board with said filler material acting to prevent said printed wiring board from deforming against said layer of stiffening material.