Patent ID: 8198546

Claim:
A printed wiring board comprising: a core substrate; a conductive circuit formed on the core substrate; a built-up layer formed over the core substrate and the conductive circuit, the built-up layer comprising a plurality of insulating layers and a plurality of conductive circuits formed on the insulating layers, respectively; and a solder-resist layer formed over the built-up layer and having a plurality of openings exposing a plurality of portions of an outermost conductive circuit in the built-up layer, respectively, the plurality of portions of the outermost conductive circuit forming a plurality of conductive pads configured to mount an electronic component, wherein the solder-resist layer has a surface including an electronic component mounting region, and the electronic component mounting region has the conductive pads and a leveled surface which has a maximum roughness in a range of 0.3 to 7.5 μm.