Extended Pad for Testing Package Parts
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Extending a controlled collapse chip connection pad to provide a landing area for a test probe makes testing possible without serious circuit degradation. Modifying interior pads by forming distinct solder wettable areas for chip connection and for probing minimizes solder stealing problems in the extended pads. Probing package parts for electrical testing requires a large number of contacts (N 1000) which must probe the part without damage to the thin film structures. This structure allows the use of an existing probe technology buckling beam contact (BBC), to address pads formed by modifying the pad shape. The figure shows an enlargement of a small area of a typical silicon thin film multi-chip, or tile part, showing five pads. Each chip may have 100 or more pads and there are additional pads at each part edge.