Heat slug BGA (HSBGA) is an upgraded type of PBGA. Within the molding area, a piece of copper heat slug is implanted. The heat slug is intended to lower the thermal resistance (θJA) of PBGA without change of material. The θJA of HSBGA is generally 20% lower than PBGA and achieves 5 to 6W of thermal dissipation under natural convection. This technology can be applied to any kind of die-up substrates (e.g. 2- or 4-layer BT, and metal core). HSBGA is an excellent solution for cost-effective high power package, high-speed ICs like graphics chips, communication and networking ICs.