PCB Heatsinks Absorbing and Dissipating Heat DEFINITION A Heatsink absorbs and dissipates heat from an electronic component through contact with metal base (aluminum PCB), or thermal interface material, which increases thermal mass and heat dissipation (conduction/convection). HEATSINK TO PCB Existing multilayer registration system enables heatsink registration to printed circuit board within 5 mils prior to bonding process. PCB with copper heatsink HEATSINK CALCULATOR Click here for Temperature Calculator