Nickel and nickel alloys

Most of semiconductor solderability improvement is done using tin The tin plating can be done in lead frame or barrel Barrel tin electroplating process for Surface Mount X (SMX) semiconductor packages has a distinct advantage: the ability to finish a greater volume of work for a specified time period However, as the SMX packages are applied in critical automotive and medical fields, barrel tin plating also faces yield and quality challenges This work discusses the common rejects and some solutions to improve the quality and yield of barrel tin plating process for SubMinitature version B (SMB) semiconductor packages Among the common rejects are missing plating, burn mark, unit coupling, lead discoloration and crack package The  improvement efforts are the introduction of metal ballast to improve conductivity and reduce missing plating, improvement of solution filtration to avoid discoloration, addition of ‘Zig-zag balls’ to reduce  unit coupling, auto tracking of ampere spike that causes crack package and vision system to further screen out rejects As a result, SMX barrel plating yield can be increased to more than 998% and there are continuous effort to further improve yield and quality

Quality and Yield Improvement of Barrel Tin Plating Process for SMX Semiconductor Packages

Nickel is a metal electroplated on a wide variety of articles both ferrous and nonferrous. Small articles which are difficult to jig are frequently plated by barrel plating technique. In conventional barrel plating the parts to be plated are contacted by either a rod, dangler or metallic wall as they rotate inside the barrel. A modified barrel design has been effected by changing the dangler contact with uniformly distributed contact tips at varying points on the periphery of the barrel. A modification in anode positioning is also made. Improvement in thickness uniformity brought about by use of this modified design are reported in this paper.

Electroplating of Nickel Using a Modified Barrel Design

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Electroplating of Nickel Using a Modified Barrel Design