Cavity-down ball grid array semiconductor package with heat spreader

A cavity-down ball grid array (CDBGA) semiconductor package with a heat spreader, comprising:

• a substrate having a first surface and a second surface, wherein at least a ground ring and a plurality of ground vias are formed on the second surface of the substrate, and a metal ground layer and an opening are formed in the substrate, with the metal ground layer being exposed to edges of the substrate;
• a heat spreader having an upper surface and a lower surface, wherein at least a cavity is formed on the upper surface, allowing the substrate to be mounted in the cavity with the first surface of the substrate being attached to the heat spreader;
• an electrically conductive adhesive for electrically connecting the exposed metal ground layer and the ground ring of the substrate to an inner wall of the cavity of the heat spreader;
• a semiconductor chip mounted on the lower surface of the heat spreader and received in the opening of the substrate;
• a plurality of bonding wires for electrically connecting the semiconductor chip to the substrate;
• an encapsulant for encapsulating the semiconductor chip and bonding wires;
• and
• a plurality of solder balls implanted on the second surface of the substrate, for electrically connecting the semiconductor chip to an external device.