Patent ID: 9558964
Date: 2017-01-31
CPC Classifications: H01L,H05K

Claim:
1. A method of fabricating a microelectronic assembly, comprising: forming an encapsulant filling spaces between adjacent ones of electrically conductive elements projecting upwardly above a second surface of a dielectric region, the second surface opposite from a first surface of the dielectric region which faces and is supported on a supporting structure, wherein a plurality of traces electrically connected with the conductive elements and extend in at least one direction parallel to the second surface, the encapsulant having a surface overlying and facing away from the second surface, wherein ends of the conductive elements are at the surface of the encapsulant; and then removing at least a portion of the thickness of the supporting structure in a direction towards the first surface of the dielectric region, wherein a plurality of contacts are at the first surface of the dielectric region, the contacts electrically coupled with the conductive elements; and then assembling a microelectronic element having a face and a plurality of element contacts at the face, the assembling performed such that the element contacts face and are joined to the plurality of contacts at the first surface of the dielectric region, thereby electrically interconnecting the element contacts with the contacts at the first surface of the dielectric region, wherein the encapsulant has a coefficient of thermal expansion (CTE) no greater than twice a CTE associated with at least one of the dielectric region or the microelectronic element.