Resistance of BGA Contacts During Reliability Tests

This paper shows the latest results of lead-free BGA solder joints investigations performed in frame of GrenRoSE Project financed by EC. First part is devoted for resistance measurement of BGA256r (pitch 1.27) contacts. Resistance was measured during mechanical bending tests. Resistance of lead-free and lead-containing BGA contacts during reliability test and reliability of these contacts were compared. Second part is devoted for reliability assessment of solder joints of BGA packages, type CSP84 (pitch 0.5 mm), BGA100 (pitch 0.8 mm), BGA144 and BGA676 (pitch 1.0 mm), BGA272 (pitch 1.27 mm), lead-free and lead-containing. These packages were tested by thermal shocks according to IPC 9701A and EN 62137 and mechanical fatigue test by bending on mechanical stand.