Patent ID: 6111204
Filing Date: 2000-08-29
Classification: H05K,Y02P

Abstract:
A circuit board assembly for accommodating fine-pitch applications, comprising:(a) an electrically insulative substrate surface;(b) a plurality of tri-metal-layer bond pads arranged in a generally straight row on said substrate surface wherein said row defines a width direction therealong, each bond pad comprising:(i) a bottom layer attached to said substrate surface, said bottom layer being made of a first metal and having an overall width W1 as measured along said width direction;(ii) a top layer disposed above and generally concentric with said bottom layer, said top layer being made of said first metal and having an overall width W2 as measured along said width direction; and(iii) a middle layer made of a second metal connecting said bottom layer and said top layer; and(c) a circuit trace arranged on said substrate surface and being made of said first metal, wherein said circuit trace runs between two adjacent ones of said plurality of tri-metal-layer bond pads;(d) wherein W2>W1 for at least said two adjacent bond pads.