Browse Prior Art Database

Improved Joint Strength, Reliability and Cost

IP.com Disclosure Number: IPCOM000106234D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Brownlow, JM: AUTHOR

Abstract

The employment of a cluster of blind metal vias in conjunction with each live via is disclosed for providing joint strength in a multi-layered ceramic package. The blind vias serve a mechanical purpose only and relieve stresses on the ceramic during pin attachment. This is in contrast to the ceramic packages of the art which rely only on the live vias to provide both electrical and mechanical functions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Improved Joint Strength, Reliability and Cost

      The employment of a cluster of blind metal vias in conjunction
with each live via is disclosed for providing joint strength in a
multi-layered ceramic package.  The blind vias serve a mechanical
purpose only and relieve stresses on the ceramic during pin
attachment.  This is in contrast to the ceramic packages of the art
which rely only on the live vias to provide both electrical and
mechanical functions.

      As seen in the Figure, a multi-layered ceramic package 10
includes a live via 20 which extends through the layers and provides
an electrical connection as desired.  Additional vias 30a, 30b,
30c...which do not extend past a single layer are clustered around
the live via.  The additional vias 30a, 30b...are designated "blind
vias" as they serve no electrical function due to their failure to
extend past a single layer.  However, the blind vias 30a, 30b...do
serve a mechanical function.  Thus, after metallization in area 40,
the cluster of blind metal vias 30a, 30b...accepts pins along with
the live metal via 20 and relieves the ceramic surrounding the live
via 20 of most of the stresses associated with pin attachment and
thermal cycling.