EZReball™ preform technique used for reballing area array devices is one of the methods used at BEST for the attachment of solder balls. This patented process was developed primarily with the speed of attachment and simplicity in mind. The key to this method is the engineered polyamide and other polymer-based carrier ("preform") which holds the solder balls in place. After applying flux to the bottom of the part, the balls and part land patterns are aligned and “squared up” the device by aligning the land patterns of the device on top of the perform ball locations. The assembly is then reflowed. After being cooled the perform is simply peeled away. Finally the part is cleaned and inspected.The solder
The major advantage of this technique is in its convenience as the solder balls are packaged inside a preform. Each unique solder alloy, ball size and grid pattern requires a new preform.
After being cooled the EZReball™ preform can be pulled off of the package.
Using Isopropyl alcohol and soft brush the flux and adhesive residue can be clean off the package and reflowed solder balls.
The package can be either air dried using a static neutralizing gun or with nitrogen.