Fischer elektronik aluminium heat sink mount bolt on to 220to3p fischer elektronik sk 409 25 4 sts the fischer elektronik aluminium heat sink mount bolt on 82cw to 220to3p is a semiconductor heat sink also available in either bolt on or clip on mounting types in a selection of thermal resistances and suitable for use with to 220 and to 3 p packaged devices the all alloy heatsinks have a 3mm thick mounting plate and have a black anodised finish that maximises radiative thermal lo