Alutronic offers lightweight aluminium profiled heatsinks with multipoint solder fixing feet for assembly in a dip soldering bath.
The pre-tinned solderable punched/bent parts with twin soldering pins for the PCB mounting are pressed into a slide-in groove in the profile. The heat sources (semiconductors) can also be fixed to the mounting surface with spring clips, hence no need for any screws or rivets. The insulated installation of these semiconductors is also considerably simplified compared to conventional screw fixing. The heatsink can be pre-assembled with the heat sources and then mounted as one unit for soldering together. The relatively high thermal surface resistance of the soldering pins, cutting heat transfer to the heatsink, together with the low heat capacity ensures that the soldering point is not excessively cooled during soldering. The low mass of the heatsink means that the soldering point is only moderately loaded even when subjected to vibration.
Advantages are pre-assembly option and elimination of additional cost-intensive assembly work (eg screwing, riveting).
The Alutronic catalogue includes a standard version for space-saving mounting on PCBs with Eurocard format. The PR142 profile can also be supplied in lengths to suit customers' specifications, with or without solder feet. Solder feet fixings are also available for new profile installations to suit customers' requirements, also in conjunction with a clip-in groove when assembly times and costs must be kept to a minimum.
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