Aavid thermalloy to220 high power dissipation heatsinks aavid thermalloy bw38 4 a high power dissipation vertical mounting extruded heatsink with solderable fixing pins designed to accommodate a single to 220 to 218 or to 247 package either via a separate clip or by a mounting holefixing lugs are on a standard 254mm pitch aavid thermalloy bw38 4 to220 hole type 73cw heatsink