Fischer elektronik heatsinks with combi punching fischer elektronik sk 01 75 sa cb the fischer elektronik 23 heat sink 75 x 115 x 26mm has been specially developed for semiconductor design to 3 sot 9 to 220 and sot 32 with combi punching the effective heat dissipation make it ideal for a wide range of applications fischer elektronik sk 01 75 sa cb heat sink 23cw to3 sot9 to99 to220 sot32