Wafer level chip scale package system with a thermal dissipation structure
View Patent ↗A wafer level chip scale package system is provided forming a wafer having an interconnect provided on an active side, forming a thermal sheet having a first thermal interface material layer and a thermal conductive layer, and attaching the thermal sheet on a non-active side of the wafer.
1. A method of manufacturing a wafer level chip scale package system comprising:
forming a wafer having a non-active side and an active side;
forming an interconnect on the active side;
forming a thermal conductive layer;
forming a first thermal interface material layer pre-applied on the thermal conductive layer to form a thermal sheet;
attaching the thermal sheet on the non-active side of the wafer; and
curing the thermal sheet onto the non-active side of the wafer.
2. The method as claimed in claim 1 wherein attaching the thermal sheet on the non-active side of the wafer includes attaching the first thermal interface material layer on the non-active side.
3. The method as claimed in claim 1 further comprising attaching a heat sink on a second thermal interface material layer on the thermal sheet, wherein the second thermal interface material layer is attached on the thermal conductive layer.
4. The method as claimed in claim 1 wherein forming the wafer having the interconnect provided on the active side includes thinning the non-active side.
5. The method as claimed in claim 1 forming the thermal sheet includes attaching a release layer to the first thermal interface material layer.
6. A method of manufacturing a wafer level chip scale package system comprising:
forming a wafer having circuitry and an interconnect provided on an active side;
forming a thermal sheet having a thermal interface material layer pre-applied on a thermal conductive layer;
laminating the thermal sheet on the wafer with the thermal interface material layer on a non-active side of the wafer, and
curing the thermal sheet onto the non-active side of the wafer.
7. The method as claimed in claim 6 further comprising protecting the non-active side with the thermal sheet during singulation.
8. The method as claimed in claim 6 wherein further comprising marking the thermal sheet on the wafer.
9. The method as claimed in claim 6 further comprising forming the wafer level chip scale package system from singulation of the wafer having the thermal sheet thereon.
10. A wafer level chip scale package system comprising:
an integrated circuit die having a non-active side and an interconnect provided on an active side; and
a thermal sheet having a thermal interface material layer pre-applied to a thermal conductive layer, the thermal sheet cured on the non-active side of the integrated circuit die.
11. The system as claimed in claim 10 wherein the thermal sheet on the non-active side of the integrated circuit die has the first thermal interface material layer on the non-active side.
12. The system as claimed in claim 10 further comprising a heat sink on the thermal sheet on the thermal conductive layer.
13. The system as claimed in claim 10 wherein the integrated circuit die having the interconnect provided on the active side is thinned on the non-active side.
14. The system as claimed in claim 10 further comprising the thermal sheet marked on the integrated circuit die.
15. The system as claimed in claim 10 wherein:
the integrated circuit die having an interconnect provided on the active side has circuitry;
the thermal sheet has the first thermal interface material layer having a thickness of less than or equal to about 50 microns pre-applied on the thermal conductive layer having a thickness of less than or equal to about 100 microns; and
the thermal sheet on the non-active side of the integrated circuit die has the thermal interface material layer on the non-active side.
16. The system as claimed in claim 15 wherein the thermal sheet on the non-active side protects the non-active side.
17. The system as claimed in claim 15 wherein the first thermal interface material layer includes a thermally conductive material.
18. The system as claimed in claim 15 wherein the thermal conductive layer is a foil.
19. The system as claimed in claim 15 wherein the thermal conductive layer includes a material of copper, gold, silver, aluminum, nickel, or an alloy.