Abstract:
A printed wiring board includes an insulating layer, a first conductor layer embedded into a first surface of the insulating layer and including connecting portions to connect an electronic component, a second conductor layer projecting from a second surface of the insulating layer, a solder resist layer covering the first conductor layer and having an opening structure exposing the connecting portions, a barrier metal layer formed on the connecting portions such that the barrier layer is projecting from the first surface of the insulating layer, and metal posts formed on the barrier layer such that the metal posts are positioned on the connecting portions, respectively. Each metal post has width which is greater than width of a respective connecting portion, and the barrier metal layer includes a metal material which is different from a metal material forming the metal posts and a metal material forming the first conductor layer.
Abstract:
A printed wiring board includes an insulation layer, a first conductive layer embedded into first surface of the insulation layer, a second conductive layer formed on second surface of the insulation layer, a via conductor penetrating through the insulation layer and electrically connecting the first and second layers, and a solder-resist layer covering the first layer and having an opening structure forming an exposed structure of the first layer. The exposed structure is formed to connect an electronic component to the first layer, and the first layer has a barrier-metal layer and a metal layer on the first layer such that the barrier-metal layer is on surface of the first layer and includes metal different from metal forming the metal layer and that the metal layer is on surface of the barrier-metal layer in the exposed structure and protruding from the first surface of the insulation layer.
Abstract:
A wiring board includes an electrode pad having a first surface and a second surface located on an opposite side from the first surface, a conductor pattern connected to the first surface of the electrode pad, and an insulator layer embedded with the electrode pad and the conductor pattern. The insulator layer covers an outer peripheral portion of the second surface of the electrode pad.
Abstract:
An interconnect structure that includes a substrate having an electrical component present therein, and a under-bump metallurgy (UBM) stack that is present in contact with a contact pad to the electrical component that is present in the substrate. The UBM stack includes a metallic adhesion layer that is direct contact with the contact pad to the electrical component, a copper (Cu) seed layer that is in direct contact with the metallic adhesion layer layer, a first nickel (Ni) barrier layer that is present in direct contact with copper (Cu) seed layer, and a layered structure of at least one copper (Cu) conductor layer and at least one second nickel (Ni) barrier layer present on the first nickel (Ni) barrier layer. A solder ball may be present on second nickel (Ni) barrier layer.
Abstract:
Disclosed herein is a printed circuit board, including: an insulating layer; a circuit layer formed on one surface of the insulating layer; and a via electrode penetrating through the insulating layer and being connected with the circuit layer, wherein the circuit layer is formed in a structure where different kinds of metal layers having different thermal conductivities are laminated.
Abstract:
A wiring board includes an electrode pad having a first surface and a second surface located on an opposite side from the first surface, a conductor pattern connected to the first surface of the electrode pad, and an insulator layer embedded with the electrode pad and the conductor pattern. The insulator layer covers an outer peripheral portion of the second surface of the electrode pad.
Abstract:
In one embodiment, a preliminary solder layer made of a Sn alloy is formed on a connecting pad of a wiring substrate. A solder bump made of a Sn alloy is formed on an electrode pad of a semiconductor chip. After contacting the preliminary solder layer and the solder bump, the preliminary solder layer and the solder bump are melted by heating to a temperature of their melting points or higher to form a solder connecting part made of a Sn alloy containing Ag and Cu. Only the preliminary solder layer of the preliminary solder layer and the solder bump is composed of a Sn alloy containing Ag.
Abstract:
A process for fabricating a circuit board is provided. In the process, first, a circuit substrate including an insulation layer and at least a pad contacting the insulation layer is provided. Next, a barrier material layer is formed on the circuit substrate. The barrier material layer completely covers the insulation layer and the pad. Then, at least one conductive bump is formed on the barrier material layer. The conductive bump is opposite to the pad, and the material of the barrier material layer is different from the material of the conductive bump. Next, a portion of the barrier material layer is removed by using the conductive bump as a mask, so as to expose the surface of the insulation layer and to form a barrier connected between the conductive bump and the pad.
Abstract:
A packaging substrate with conductive structure is provided, including a substrate body having at least one conductive pad on a surface thereof, a stress buffer metal layer disposed on the conductive pad, a solder resist layer disposed on the substrate body and having at least one opening therein for correspondingly exposing a portion of top surface of the stress buffer metal layer, a metal post disposed on a central portion of the surface of the stress buffer metal layer, and a solder bump covering the surfaces of the metal post. Therefore, a highly reliable conductive structure is provided, by using the stress buffer metal layer to release thermal stresses, and using the metal post and the solder bump to increase the height of the conductive structure.