November 21, 2024 
Professional magazine and portal dedicated to electronics 
So-called PCB heatsinks are used very often when targeted heat dissipation of electronic components on the PCB is required.
Printed circuit board heatsinks from Fischer Elektronik offer excellent solutions for component heat dissipation from both, a thermal and assembly point of view. The existing extensive product portfolio of Fischer Elektronik is once again being expanded to include further functional geometries of PCB heatsinks for snap-in transistor retaining springs. The new PCB heatsinks from the SK 697, SK 701, SK 702, SK 703, SK 704 and SK 705 series offer efficient solutions for heat dissipation and are available in different sizes and lengths. The heatsinks are attached to the PCB via an integrated profile-pressed threaded channel in the heatsink base.
The individual heatsink can be screwed or fastened to the PCB using a metric M3 screw. It is also possible to press a captive solder pin (item no. ELS 3) into the threaded channel instead of a screw connection. The solder pin is made of brass and has a solderable surface coating, which means that the PCB heatsink is firmly connected directly to the PCB, e.g. during the reflow soldering process. The different transistor types, e.g. TO 220, TO 218, TO 247, various SIP-Multiwatt and hole-less MAX types, are attached using a profile-integrated groove geometry and specially developed snap-in transistor retaining springs (item no. THFU 1-7). The specially shaped stainless steel snap-in transistor retaining springs are clipped directly into the groove, do not fall out and fix the transistors with high contact pressure on the mounting surface of the respective heatsink. The resulting simple installation with a secure hold ensures optimum heat transfer between the device and the heatsink mounting surface.
The new PCB heatsinks are available with a black anodized surface as standard, although other surfaces and additional mechanical processing can be implemented and offered according to customer-specific requirements. The listed innovations from the product range of PCB heatsinks for snap-in transistor retaining springs can also be found at www.fischerelektronik.de/en.
