Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Solder Ball under BGA

Dreamsniper

#28260

Solder Ball under BGA | 27 April, 2004

Hi,

Can anyone help me as to what is acceptable and reject when it comes to solder balling under BGA's? I've got some BGA's with solder Ball but they seemed to be attached and they are about 10% of the size of the actual soldered BGA joint size. Our QC says they are reject but I'd like to know the standards.

Thanks and regards,

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#28271

Solder Ball under BGA | 27 April, 2004

Where blank are the balls on a BGA supposed be? UNDERNEITH, dammit!!! Fire that inspector.

It's good that you have your balls imbedded in something, so that they are not rolling around. Beyond that, consider the five ball system! - No more than 5 balls per square inch (100mm^2) allowed - Solder balls can not be greater than 5 thou (0.005in) (100um) - Solder balls cannot be less than 5 thou (0.005in) (100um) from the nearest land or trace

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#28301

Solder Ball under BGA | 28 April, 2004

Solder ball acceptability: IPC-A-610, 6.5.3.1 & 12.4.10

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