A cavity down ball grid array package having a heat spreader, a substrate, a die, a plurality of conductive wires, a capsulation and a plurality of solder balls. The substrate has a first surface and a second surface. The first surface of the substrate is attached to the heat spreader. The substrate has a through hole that passes through the substrate and exposes the heat spreader. The substrate and the heat spreader are electrically connected. The die has a plurality of bonding pads on the active surface. The back surface of the die is attached to the heat spreader inside the through hole. One end of each conductive wire is electrically connected to a bonding pad while the other end of the conductive wire is electrically connected to the substrate. The encapsulation fills the through hole and encloses the die and the conductive wires. The solder balls are attached to the second surface of the substrate.
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