Patent ID: 7042730

Claim:
A power module comprising: a first lead frame having a first conductive pad; a first power device disposed on and electrically connected to said first conductive pad; a first heatsink in thermal contact with said first conductive pad; wherein there is no intermediate body disposed between said first conductive pad and said heatsink that retards heat transference from said first power device to said first heatsink; and a second lead frame having a second conductive pad, a second power device disposed on and electrically connected to said second conductive pad, and a second heatsink in thermal contact with said second conductive pad, wherein there is no intermediate body between said second conductive pad and said second heatsink that retards heat transference from said second power device to said second heatsink, and wherein said second heatsink is larger than said first heatsink whereby a thermal gradient between said heatsinks may be reduced to reduce thermal stresses on said module.