Fischer elektronik heat sinks for to 3to 55sot 9sot 32to 220 fischer elektronik fk 223 sa cb the fischer elektronik 17mm 68 heat sink is a finger shaped heatsink with combi punching designed to a high standard and ideal for power semiconductors fischer elektronik fk 223 sa cb 68cw heat sink for to3 to55 sot9 sot32 to220