GREETINGS:
        CAN  ANYONE OUT THERE TELL ME THE  DOWNSIDE OF BALL BONDING TO A
PB/SN SURFACE.  I HAVE PERFORMED PULL TESTS AFTER THERMAL CYCLING WITH
GOOD RESULTS
        REALIZING THIS IS NOT STANDARD PRACTICE, MY CONCERNS ARE
OXIDATION AND LONG TERM  PROBLEMS AS AN INTERMETALIC MISMATCH