BGA substrate via structure

Details BGA substrate via structure BGA substrate via structure

2006-01-24

2006-01-24

Potter, Roy (Department: 2822)

Active solid-state devices (e.g., transistors, solid-state diode

Combined with electrical contact or lead

Flip chip

C257S737000

Reexamination Certificate

active

06989606

ABSTRACT:
Typically, primary electrical connection between a semiconductor chip and an external solder ball contact on a Ball Grid or Chip Scale Package is by way of a via extending through a dielectric substrate. The aspect ratio between via diameter and depth is critical for reliable and high yield solder ball attachment during printed circuit board assembly. Excellent ball adherence and reliability of BGA solder ball contacts is achieved through controlling the aspect ratio of the substrate vias by partially plating a solid solderable conductor core in each via. An improved via structure is disclosed wherein the depth of the viva is reduced without the negative effects of alternate methods, such as thinner substrates, or wider vias.

REFERENCES:
patent: 6097089 (2000-08-01), Gaku et al.
patent: 6180504 (2001-01-01), Farnworth et al.
patent: 6833615 (2004-12-01), Geng et al.

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