Ray Prasad Consultancy Group
Ray Prasad is the founder of Ray Prasad Consultancy Group which provides teaching, consulting and technical expert services in tin-lead and lead free technologies using SMT, BGA, BTC, fine pitch and through hole components. Mr. Prasad is a long time member of IPC, and is currently the chairman of BGA committee IPC-7095 "Design and Assembly Process Implementation for BGA" and Co-Chairman of recently created IPC-7093 "Design and Assembly Process Implementation for Bottom Terminations" surface mount Components (BTCs) such as QFN, DFN and MLF.
Ray Prasad has submitted responses to the following questions.
Exposed Copper Defect
No. Exposed copper is not considered a defect in J-Std-001 or IPC-A-610. It used to be defects ways back when ...
BGA Solder Ball Collapse
Yes they do assuming the their weights per ball are the same and they both use appropriate peak temp and ...