Conclusions – A P Products Meritec SMT Products Using Lead-Free Solder User Manual
Page 9
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9
Conclusions
Best results were seen in the range of 240°C to 247°C spike temperature with a
minimum time above the liquidus point of the solder. Clearly, profiles such as these are
much more stressful to the plastic components of the SOP sockets. Though the new
lead-free solder alloys do not flow and wet as well as lead-bearing alloys, the solder joints
were quite acceptable based on the new proposed standards. Spike temperatures
below 239°C resulted in unacceptable wetting of the solder to the contacts.
The recommended profile for all Meritec SMT products is the one labeled as “Target” on
page 8. This, when combined with a good SAC solder alloy and flux chemistry should
result in a good starting point.