BGA -
(Ball Grid Array) A popular surface mount chip package that uses a grid of solder balls as its connectors. Available in plastic and ceramic varieties, BGA is noted for its compact size, high lead count and low inductance, which allows lower voltages to be used. BGA chips are easier to align to the printed circuit board, because the leads, which are called "solder balls" or "solder bumps," are farther apart than leaded packages. Since the leads are underneath the chip, BGA has led the Way to Chip Scale Packaging (CSP) Where the package of the semiconductor die itself. See Chip Package, Microbga and flip chip.
BGA Solder Balls
These are the undersides of BGA packages showing the solder balls. The small one on the ruler is a μBGA (MicroBGA) chip from Tessera. Using the entire square of the chip package for leads is an advantage of the BGA method.
(Image Samples Courtesy of Amkor Technology, Inc.)
BGA Package Types
Thase Cross Sections Show BGA Packages In Standard and CSP Varieties.
(Illustration Courtesy of Joseph Fjelstad.)
Different Contact Types
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(Illustration Courtesy of Joseph Fjelstad.)
