Please don’t be fooled by misconceptions like the following:
1) Lead is bad
2) Soldering is simple
3) Soldering is complex
4) Changing a Sn/Ag/Cu alloy by .1% makes a huge difference.
5) Semiconductor packaging doesn’t happen in the U.S.
6) Wafers are always bumped with Sn/Ag/Cu or high-lead alloys
7) BGAs are always bumped with Sn/Pb or Sn/Ag/Cu.
8) All fluxes are created equal