Plasma etching of solder resist openings

Abstract

A method of forming an electronic assembly. The method includes covering a patterned conductive layer that is on a dielectric layer with a solder resist; depositing a metal layer on to the solder resist; depositing a photo resist onto the metal layer; patterning the photo resist; etching the metal layer that is exposed from the photo resist to form a metal mask; removing the photo resist; and plasma etching the solder resist that is exposed from the metal mask. An electronic assembly for securing for an electronic card. The electronic assembly includes a patterned conductive layer that is on a dielectric layer; and a solder resist covering the patterned conductive layer and the dielectric layer, wherein the solder resist includes openings that expose the patterned conductive layer, wherein the openings in the solder resist only have organic material on side walls of the respective openings.

Dependencies are inferred from the claim text.