Patent ID: 8415004

Claim:
A low thermal-impedance insulated metal substrate, comprising: an electrical-conductive metal layer; a first thermal-conductive polymeric composite layer formed on the electrical-conductive metal layer and having a thickness of 1˜25 μm, a thermal-impedance less than 0.13° C.-in 2 /W and a glass transition temperature (Tg) higher than 200° C.; a second thermal-conductive polymeric composite layer formed on the first thermal-conductive polymeric composite layer and having a thickness of 1˜65 μm and a thermal-impedance less than 0.10° C.-in 2 /W; and a thermal-conductive metal layer adhered to the second thermal-conductive polymeric composite layer by a pressing process; wherein a total thickness of the first and second thermal-conductive polymeric composite layers is larger than 15 μm.