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LF BGA Tests

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#36979

LF BGA Tests | 5 October, 2005

What kind of destructive testing is anyone doing for LF BGAs?

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Amol

#36980

LF BGA Tests | 5 October, 2005

depends on what you want evaluated!

you can thermal cycle the BGAs and the examine the x-sections to determine failure modes at different stages of thermal cycles.

you can do a stress test and corelate the # of thermal cycles with the microstructure and the ultimate decrease in shear strength values

you could have different combinations of LF alloys and surface finishes (amongst other processing conditions) and then corelate the shear strength with the materials and processes used.

Again, it all depends on what you need to avaluate

Amol

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#36981

LF BGA Tests | 5 October, 2005

Thanks Amol,

You brought up some good ideas that we'll use.

Has anyone ever heard of under filling the BGA (after reflow) with a material that cures, then thermal removing the BGA to check the acual size of the ball to pad?

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