CRITICAL DILEMA! Has anyone run into the problem described below and if so, what was the fix (besides not dealing with this Supplier)? Also, we do not have component manufacturing process experience.
We are purchasing a surge resistor that functions as desired, but we cannnot consistently get a solderable terminantion from the Manufacturer. The parts have copper terminations plated with 90/10 tin/ lead. The parts are showing visible copper/brass colored material on the inward formed L-shaped ribbon leads terminations. In addition, the parts that look `good' are not accepting solder to 610 STD. During solderability testing, the solder globs and spikes on the termination. These parts were stripped and batch plated as initially they failed solderability due to oxidization. The reworked parts are certified as having 8-12 microns of plating coverage.
The Supplier is adament the parts are good, knowing we are an IPC CLass 3 facility. Personally, I have never come across this type of a product before and to this point in time, we can not find another manufacturer whose product fits the engineering requirement.
Can anyone advise if re-stripping and re-plating will be detrimental to the copper termination? The molded body will be fine. We can't purchase new material in the required time line as it not a stocked item.
If someone who has knowledge of resistor type part manufacturing would like to contact me and share some information, it would be appreciated.
Thanks in advance for the help,
Carol
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