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Mel Parrish
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FSO/Director Training Resources
STI Electronics Inc.
Mel Parrish is the FSO and Director of Training Materials Operations, Soldering Technology International (STI), in Madison Alabama. Before coming to the STI, Mel was the Training Manager for the Electronic Manufacturing Productivity Facility (EMPF) and President of Manufacturing Technology Training Center Inc. (MTTC) in Ridgecrest, CA. He remains active in industry trade associations and organizations such as IPC, SMTA, and SME.

Mel Parrish has submitted responses to the following questions.
Acceptable Number of Repairs
Historically speaking the only standard I recall that specified limits for the number of rework, repair, and or modification was ...
BGA re-balling process
There are several reballing techniques that are quite effective at reballing or even initially placing spheres for prototype components. STI ...
BGA component re-balled with lead free spheres
We have been placing SnPb spheres on ENIG for as long as there have been BGA packages .. with good ...
Several questions including specifications for hole ratio and humidity control
I'll take the first one. Reference DOD-STD-2000, Volume 2A, 5.1.1.2.1 - 5.1.1.2.4 Round leads Maximum clearance, 0.028"/0.7mm Minimum clearance, 0.010"/0.25mm ...