Kruschkiste » If you love devices

Since the late 1990s ball grid array (BGA) packages have been gaining as a preferred package style for several reasons. Their IO density compared with the previous high-density ultra fine pith quad flat packs (QFPs) is such that they have shrunk the necessary footprint on the PCB by a factor of 50%. If we lump the BGA style of package Cheap Jared Dudley Jersey , a high-density IO with solder balls for the interconnection in with its stacked version counterpart the POP then this increase in density approaches nearly 100%. The ability to get more done in less space along with shorter trace spacing and length requirements for board layouts using this package style have allowed boards to be clocked at much higher rates thereby increasing processing speed. In addition, the reliability of the placement of BGAs has been high as initially the tin-lead solder balls 鈥渟elf-centered鈥?on the pads during reflow. Lastly, the reliability of BGA packages has been increased with the use of underfills, the use of specialty flex solder balls and even solder columns with integrated springs.

The increased use of BGAs and the underlying trend of ever-smaller package sizes Cheap Eric Bledsoe Jersey , finer pitches, and their placement onto ever denser printed circuit boards has led to greater and greater challenges in BGA rework. In addition to these challenges, there are many others that have made the job of BGA rework technicians more and more difficult. One of the trends in making ">BGA Rework more difficult is their ever-increasing usage on a handheld device. Due to the drop test requirements of these products in many cases, the BGAs and other higher density devices need to be underfilled. Underfilled BGAs have the challenge of the tacky material 鈥渟quirt out鈥?causing solder shorts underneath the BGA. In addition Cheap Devin Booker Jersey , the tacky nature of this material tends to lift pads as well as destroying the underlying solder mask underneath the BGA. This makes the BGA rework even more challenging. The ever-thinning device packages of BGAs causes the packages to warp. This too makes BGA rework difficult.


While large packages with large-sized pitches placed on sparsely populated printed circuit boards made BGAs simple to remove and replace, BGA rework today requires a greater level of machine sophistication. With pitches down into the 0.3mm areas and package sizes routinely under 10 x 10mm placement with a vision system using a highly precise and repeatable XY motion system is required. Placement accuracies for today鈥檚 BGA rework need to be in the less than a 1mil tolerance range. In addition to the lead-free packages, the rework system now requires sophisticated temperature control with programmable multi-zone bottom heaters, nitrogen capability and low flow rates at the air nozzle. In addition to the rework equipment set Cheap Marquese Chriss Jersey , the inspection equipment needs to be of a higher capability. X-ray inspection equipment with very small spot sizes is a requirement for BGA inspection post-BGA rework. The ability to measure the sphericity of the solder balls, the solder ball diameter, the ability to shoot through RF shields as well as higher density ground planes is now a necessity for the x-ray equipment requirements for BGA rework. Also, the endoscope is a necessity for checking the ball collapse Cheap Charles Barkley Jersey , the surface of the BGA ball post reflow, the wetting action as well as other attributes is important in BGA rework.



In addition to the equipment requirements for modern day BGA rework, the skill level, dexterity and process knowledge of the rework technicians working on BGA rework is even more demanding today. The BGA rework technician needs to understand reflow profiles in order to deal with printed circuit boards with a high density of ground planes. The BGA rework technician must also understand flux chemistries and how this impacts the kind of cleaning which can be done underneath the device. The BGA rework technician must also be able to understand how a variety of conformal coatings can be removed from the PCB as well as underneath the BGA. BGA rework technicians must also understand how a device which neighbor the BGA to be reworked can or could be impacted by the BGA rework process profile.


As BGA packages have become more widely-accepted the BGA rework process has become more difficult. This has meant that both the equipment used in BGA rework as well as the technicians doing the rework have had to become more sophisticated.

More About the Author

I am the principal of BEST Inc and I have the passion for teaching in a variety of life skills as well as in soldering and PCB repair as well in Social Media Marketing.

Total Views: 503Word Count: 721See All articles From Author


The Samsung RF510-S02 Laptop Review Computers Articles | March 3 Cheap Grant Hill Jersey , 2011
You may want a laptop that is fast, reliable, and built to last, one that won?t break down with use. The Samsung-RF510-S02-15-6-inch Graphite Radiant laptop may be the one that will guarantee a fine service for you.




A good laptop is one that has all the features that are necessary for a good computer. You want a machine that is fast Cheap Jason Kidd Jersey , reliable, and built to last, one that won?t break down with use, one you can use daily with good battery life that lets you take it on the go. One that doesn?t balk at the fact of long rigorous hours of web browsing Cheap Shaquille O’Neal Jersey , chatting with friends, uploading, downloading, and a number of other things you need a laptop to do. Thus Cheap Steve Nash Jersey , the Samsung-RF510-S02-15-6-inch Graphite Radiant laptop might be the one that will guarantee a fine service for you.

If you love devices that offer excellent power as well as sleek performance, then this is the laptop for you. With its 15.6 HD LED backlit display, you will have a laptop that gives you some of the most sharp, crisp Cheap Dan Majerle Jersey , and clear images, as well as fantastic colors and hues that will transform your experienc. Cheap NHL Jerseys Cheap Jerseys Wholesale Cheap Baseball Jerseys Cheap NCAA Basketball Jerseys Cheap Wholesale Hockey Jerseys Cheap Replica Soccer Jerseys For Sale Cheap Replica NHL Jerseys Free Shipping Fake Replica College Jerseys Cheap Replica NBA Jerseys Online Cheap Replica MLB Jerseys For Sale