Eliminate Solder Bridging in BGA Devices

Solder bridging is a defect that commonly occurs during reflow of BGA devices. The BGA device can warp during reflow causing adjacent BGA spheres to come in contact and form a solder bridge. The BGA spheres located in the corners of the device are most susceptible to this phenomenon. In some cases solder bridging can be overcome by adjusting the reflow profile or repositioning the device on the PCB. However, in many cases neither of these solutions rectifies the problem forcing manufacturing to live with the DPMO yield.

With No Precision Spacer Block

solder bridging

Source: http://alpha.alent.com/Utility/Blog/2014/May/BGA-Solder-Bridging-Tech-Tip

During the liquidous phase, solder is squeezed and forms a bridge due to either substrate warpage or component weight.

Possible causes:

PCB/Component
During reflow CTE mismatches within the BGA component commonly trigger a warpage phenomenon known as
“frowning.” Frowning over-compresses or pancakes the solder spheres. Solder bridging occurs when these compressed spheres come in contact with one another during the reflow process. This is especially common in the corners of the BGA.

Recommendations:

  • Use a precision spacer block on the 4 corners of the BGA device to maintain a minimum standoff height and prevent solder bridging.
  • Contact the Alpha sales team to learn more about Precision Spacer Blocks.

With Precision Spacer Block

solder bridging 2

Source: http://alpha.alent.com/Utility/Blog/2014/May/BGA-Solder-Bridging-Tech-Tip

Maintain minimum stand-off height, allowing solder to form a more spherical ball and prevent bridging.

To learn more about ‘Elimating Solder Bridging in BGA Devices’ download the Alpha TrueHeight Spacer Block Product Guide.

 

 

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Murray Percival Company offers thousands of capital and consumable products for virtually every facet of printed circuit electronics assembly and repair. With more than 60 manufacturers to choose from, Murray Percival Co. is ready to take on your challenges with technical information, and over 50 years of experience in the circuit board manufacturing and repair industry. We have a multi-state technical sales force, as well as, on-demand shipping to anywhere in the continental United States. Our "We Know How" knowledge base provides in-depth support information for many of our products. We also offer competitive specialty pricing for customers that register on our Web Store.

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