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Yet, actual inspections show that SnCuAg solder joints can yield nearly the same contrast as PbSn solder joints.
As a result, a lead-free solder-joint image appears slightly brighter than a PbSn solder joint.
The productivity was higher for PBSN averaging 3.11 tons of CPO and 0.46 ton of PKO per hectare.
To reduce the size of the passive component to the maximum, PbSn eutectic solder balls are used to attach them directly on the board.
The CCGA 1752 package is roughly 45 x 45mm with a 42 x 42mm array of 80/20% PbSn columns on a 1.00mm pitch.
Sohn, "NEMI Lead-Free Assembly Project: Comparison Between PbSn and SnAgCu Reliability and Microstructures," Proceedings of SMT International, 2003.
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