Edge Connector Module for Memory Devices
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
In an electronic package that has a chip mounted on a ceramic substrate by C-4 solder balls, a layer of polyimide screened over the entire substrate (except for the chip site) can provide two functions. First, the layer of polyimide can act as a solder dam for the C-4 interconnections. Second, the polyimide can act as an Alpha particle barrier, thereby eliminating the need for a separate barrier layer.