Abstract: An electronic package is provided that includes a flexible polyimide film carrier having electronic circuitry on both of its major surfaces and a plurality of solder interconnection pads on a first major surface; solder mask layers located on both major surfaces, provided that areas between subsequently to be applied individual circuit chips on the first major surface exist that are free from the solder mask; and a plurality of modules attached to the film carrier by the solder balls or bumps. Also provided is a method for fabricating the electronic package that includes reflow of the solder balls or bumps to achieve attachment of the modules.

Abstract: A method for fabricating a chip carrier and attaching the chip carrier to a printed circuit board is disclosed. A plated through hole (PTH) is formed through a chip carrier substrate. The PTH has surface lands on opposite surfaces of the substrate. Next, at least one of the surfaces of the substrate is covered with a dielectric material. The dielectric material at least partially fills the PTH. A solder ball is attached to the surface land on the opposite side as the dielectric material. Then, a printed circuit board is positioned relative to the chip carrier such that the solder ball contacts a surface land of the printed circuit board. Then, the solder is reflowed. Because the solder is reflowed while the dielectric material at least partially fills the PTH, the dielectric material within the PTH prevents the solder from flowing entirely through the PTH. This prevents contamination of the opposite surface of the chip carrier.

Abstract: An electronic package is provided that includes a flexible polyimide film carrier having electronic circuitry on both of its major surfaces and a plurality of solder interconnection pads on a first major surface; solder mask layers located on both major surfaces, provided that areas between subsequently to be applied individual circuit chips on the first major surface exist that are free from the solder mask; and a plurality of modules attached to the film carrier by the solder balls or bumps. Also provided is a method for fabricating the electronic package that includes reflow of the solder balls or bumps to achieve attachment of the modules.