Microelectronic package with thermal access
View Patent ↗A method of forming a microelectronic package including the steps of providing a three-layer metal plate, having a first layer, a second layer and a third layer. A plurality of conductive elements is formed from the first layer of the metal plate. A dielectric sheet is attached to the first layer of the metal plate, such that the dielectric sheet is remote from the third layer. A plurality of conductive features is then formed from the third layer of the metal plate which are also remote from the dielectric sheet. A microelectronic element is next electrically conducted to the conductive elements and a heat spreader is thermally connected the microelectronic element.
1. A method of forming a microelectronic package comprising the steps of:
a) forming a subassembly having a first metal layer and a second metal layer, said first layer including a plurality of conductive elements, said second layer including a plurality of conductive posts;
b) attaching a dielectric sheet to said first metal layer of said subassembly, said dielectric sheet being remote from said second metal layer;
c) electrically connecting a microelectronic element to said plurality of conductive elements; and
d) thermally connecting a heat spreader to said microelectronic element.
2. The method of claim 1 , wherein said second layer is attached to said first layer after said conductive posts are formed.
3. The method of claim 1 , wherein said heat spreader and said conductive posts are formed simultaneously.
4. The method of claim 1 , wherein said plurality of conductive features include traces and a ground plate.