In the microelectronics assembly and repair industries, wettability can be a major issue. As the size of components decrease, parts become more and more susceptible to the surface tension of solder paste. 01005-sized components are the most problematic pieces to work with, but this affects parts that are 0201, 0402 and 0603 as well. Kimco Distributing carries a full line of Kester solder paste, which helps solve the problem of wettability, but changing the solder paste is not the only solution.
In an ideal world, parts and pad sizes always match up perfectly. Anyone who has repaired laptops or other electronics, though, knows this is not always true. Wettability can be an issue with any microelectronic work, but it especially comes into play when the component and pad size are not perfect matches. This scenario often results in excess solder paste on the pads, which in turn leads to uneven thermal mass distribution. Ultimately, this causes tombstoning.
Selecting a different solder paste from Kimco Distributors can overcome wettability issues. In addition to changing solder paste, using a different type of wire is another way to alter the wettability. Kimco Distirbutors has a Kester wire solder for virtually every type of application. Finally, since reflow also contributes to tombstoning, using a different flux is another possible solution. Changing to a Kester flux does not directly solve the wettability issue, but it may be enough to prevent tombstoning, which is often the real issue at hand.
As you might guess, the solution for tombstoning and wetability requires a unique approach for your specific application. Selecting the right product to meet your specific need might require a quick converstation with one of our customer service representatives. Please feel free to contact us via email [email protected] or call (800) 521-9197. With over 30 years experience working in the electronic repair and assembly industry, repair and assembly industry, there's no application issue we can't fix.