Semiconductor package with improved ball land structure
AssigneeSamsung Electronics Co., Ltd.
InventorsMyung-Kee Chung, Min-Keun Kwak, Kil-Soo Kim
Life of this patent
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Abstract
A semiconductor package has ball lands each configured to have a composite structure of SMD type and NSMD type. One peripheral portion of the ball land is covered with a mask layer, thus forming the SMD type, whereas the other peripheral portion is exposed through an opening area of the mask layer, thus forming the NSMD type. In one embodiment, the first peripheral portion is disposed to face a central point of a ball-mounting surface of a substrate, and the second peripheral portion is disposed to face the opposite direction to the central point. The composite structure of the ball lands provides more stable and enhanced connections between connection balls, such as solder balls, and the ball-mounting surface.
Claims18
A semiconductor package, comprising:
- a substrate having a planar surface;
- a plurality of ball lands formed on the planar surface of the substrate, each ball land having a ball land radius;
- a mask layer covering the planar surface of the substrate and defining a plurality of mask opening areas through which the ball lands are substantially exposed, each mask opening area having a mask opening area radius smaller than the ball land radius, each ball land including:
- a curved opening, and
- a plurality of straight openings radially arranged along an outer periphery of the curved opening, extending to a position between a land edge of the ball land and a mask opening edge of the mask opening area, and communicating with the curved opening;
- and
- a plurality of connection balls formed on the plurality of ball lands;
- wherein a centerline of the curved opening has a curved opening radius smaller than the mask opening area radius.
A semiconductor device, comprising:
- a substrate including a planar surface having a central point;
- at least one terminal land formed on the planar surface of the substrate, the terminal land having a first peripheral portion and a second peripheral portion;
- at least one connection terminal formed on the terminal land;
- and
- a mask layer covering the planar surface of the substrate and defining at least one opening area through which the terminal land is substantially exposed, one of the at least one opening area having:
- a first opening edge substantially following a first arc having a first radius;
- and
- a second opening edge substantially following a second arc having a second radius;
- wherein the mask layer overlies the first peripheral portion of the terminal land, and the second peripheral portion is exposed through the opening area of the mask layer, the second peripheral portion having a third edge substantially following a third arc having a third radius, the third radius being less than the first radius and greater than the second radius.
A semiconductor package comprising:
- a substrate having a planar surface;
- a plurality of ball lands formed on the planar surface of the substrate;
- a mask layer covering the planar surface of the substrate and defining a plurality of opening areas through which the ball lands are substantially exposed;
- a plurality of connection balls formed on the ball lands, respectively;
- a first straight line defined to pass through a land center of the ball land to a central point of the planar surface, said first straight line intersecting a land edge of the ball land at a first point and an opening edge of the opening area at a second point;
- and
- a second straight line defined to start from the land center and extend in the opposite direction to the first straight line, said second straight line intersecting the land edge at a third point and the opening edge of the opening area at a fourth point;
- and
- wherein a distance between the first point and the land center defines a first distance, a distance between the second point and the land center defines a second distance, and the first distance is greater than the second distance, and
- wherein a distance between the third point and the land center defines a third distance, a distance between the fourth point and the land center defines a fourth distances, and the third distance is less than the fourth distance.
A semiconductor package, comprising:
- a substrate having a surface;
- a mask layer covering the surface having at least one opening area;
- and
- at least one ball land formed on the surface, each ball land including:
- a first edge substantially following a first arc having a first radius;
- a second edge substantially following a second arc having a second radius;
- and one of the at least one opening area substantially exposing the ball land, the one of the at least one opening area having a third edge substantially following a third arc having a third radius, the third radius being less than the first radius and greater than the second radius.
Dependencies are inferred from the claim text.