By Karl Seelig, Vice President Technology and Tim O’Neill, Technical Marketing Manager
Sn/Cu/Ni soldering performance at low temperatures.
Nickel-modified tin-copper solder, known commercially as Sn100C®, is a leading lead-free alloy for PTH soldering, rework and hot air leveled PCB final finishes. Because it contains no silver, it is much more economical than SAC alloys containing 1, 3 or even 4 percent of the precious metal, and it produces smooth, shiny, easy-to-inspect solder joints. Why has it not gained major acceptance as an SMT alloy? In large part, fear. Fear of full compatibility with SAC reflow processes.
SnCuNi melts at 227°C. SAC305 begins to melt at 217°C, reaching its fully liquid state at...