Abstract: A semiconductor package is provided. The semiconductor package includes a substrate, a semiconductor device, a plurality of element contacts, a molding compound and a plurality of substrate contacts. The substrate has opposite to the first surface the first surface and the second surface. The semiconductor device is disposed on the first surface. The element contacts electrically connect the substrate and the semiconductor device. The molding compound encapsulates the semiconductor device and a portion of the molding compound is located between the semiconductor device and the first surface, wherein the molding compound includes a plurality of fillers, the fillers amount to 85-89% of the molding compound and the sizes of the fillers range between 18 and 23 micrometers. The substrate contacts are formed on the second surface.

Abstract: A semiconductor package is provided. The semiconductor package includes a substrate, a semiconductor element, a plurality of element contacts and a molding compound. The substrate includes a passivation layer and a plurality of substrate pads. Each substrate pad includes a protrusion and an embedded portion. The embedded portion is embedded in the passivation layer, and the protrusion projects from the passivation layer. The semiconductor element includes a plurality of under bump metallurgies (UBM) with recesses. The ratio of the width of each recess to the first width of the protrusion is larger than 1. The element contacts connect the UBM and the substrate pads. The molding compound covers the semiconductor element.