A multilayer printed circuit board is provided having a first dielectric layer and a first plating resist selectively positioned in the first dielectric layer. A second plating resist may be selectively positioned in the first dielectric layer or a second dielectric layer, the second plating resist separate from the first plating resist. A through hole extends through the first dielectric layer, the first plating resist, and the second plating resist. An interior surface of the through hole is plated with a conductive material except along a length between the first plating resist and the second plating resist. This forms a partitioned plated through hole having a first via segment electrically isolated from a second via segment.

A light source module comprising a semiconductor light source mounted directly to a conducting trace of a multilayer printed circuit board having a core comprising a plurality of core layers electrically and thermally coupled by a plurality of buried vias wherein at least one of the core layers comprises a heat sink plane.

A component (capacitor) of the high-frequency circuit provided on a first surface of the glass substrate, and the bottom of the through hole in the glass substrate on the first surface have an overlapping part on the first surface. As a result, the capacitor is formed directly above the via, that is, the through hole, thereby eliminating the need for conductive wiring from the via to the capacitor. In addition, by forming a capacitor on a very flat glass substrate before forming the through hole, and forming the through hole after that, it is possible to stably form the capacitor.

Fuse assemblies are disclosed. In one implementation, a fuse assembly may be disposed that includes a first portion of the second portion. The first portion may be formed of a first metal. The second portion may be formed of a second metal different from the first metal. The second metal may be copper, and the copper may be tin plated or silver plated.

In one example, a method includes drilling a cavity into each contact pad of one or more contact pads of a first printed circuit board to form one or more cavities. The first printed circuit board includes an embedded integrated circuit and one or more metal layers. The method further includes forming one or more first metal layers for a second printed circuit board below a bottom surface of the first printed circuit board. The method further includes forming an electrically conductive material in the one or more cavities. The electrically conductive material electrically couples the one or more contact pads of the first printed circuit board to the second printed circuit board. The method further includes forming one or more second metal layers for the second printed circuit board above a top surface of the first printed circuit board.

Presented herein is a WLCSP intermediate structure and method forming the same, the method comprising forming a first redistribution layer (RDL) on a carrier, the first RDL having mounting pads disposed on the first RDL, and mounting interposer dies on a second side of the first RDL. A second RDL is formed over a second side of the interposer dies, the second RDL having a first side adjacent to the interposer dies, one or more lands disposed on the second RDL, at least one of the one or more lands in electrical contact with at least one of the interposer dies or at least one of the mounting pads. A molding compound is formed around the interposer dies and over a portion of the first RDL prior to the forming the second RDL and the second RDL is formed over at least a portion of the molding compound.

A light source module comprising a semiconductor light source mounted directly to a conducting trace of a multilayer printed circuit board having a core comprising a plurality of core layers electrically and thermally coupled by a plurality of buried vias wherein at least one of the core layers comprises a heat sink plane.

Signal transmission characteristics in a case where a conductive pin is inserted into a through hole to perform connection with an external circuit are improved. A multilayer wiring substrate includes a front layer and a rear layer, and includes a plurality of layers in an inner layer. A conductive portion is provided in each of the layers, and a wiring is disposed on the rear layer. The conductive pin for connection with the external circuit is inserted into the through hole. A land is disposed around the through hole on the rear layer, and the land and the conductive pin are connected to each other through solder.

Presented herein is a WLCSP intermediate structure and method forming the same, the method comprising forming a first redistribution layer (RDL) on a carrier, the first RDL having mounting pads disposed on the first RDL, and mounting interposer dies on a second side of the first RDL. A second RDL is formed over a second side of the interposer dies, the second RDL having a first side adjacent to the interposer dies, one or more lands disposed on the second RDL, at least one of the one or more lands in electrical contact with at least one of the interposer dies or at least one of the mounting pads. A molding compound is formed around the interposer dies and over a portion of the first RDL prior to the forming the second RDL and the second RDL is formed over at least a portion of the molding compound.

A multilayer printed circuit board is provided having a first dielectric layer and a first plating resist selectively positioned in the first dielectric layer. A second plating resist may be selectively positioned in the first dielectric layer or a second dielectric layer, the second plating resist separate from the first plating resist. A through hole extends through the first dielectric layer, the first plating resist, and the second plating resist. An interior surface of the through hole is plated with a conductive material except along a length between the first plating resist and the second plating resist. This forms a partitioned plated through hole having a first via segment electrically isolated from a second via segment.