LEAD FRAME AND FABRICATION METHOD THEREOF

摘要

PURPOSE: A lead frame and fabrication method thereof are provided to improve the thermal and mechanical characteristics of the lead frame by using different alloy at the outer and inner part of the lead frame respectively. CONSTITUTION: A lead frame consists of two parts corresponding to a pad(21) and lead(22) respectively. The former part is made of nickel alloy and the latter is made of copper alloy as their different requirements such as thermal, mechanical and electrical characteristics. The nickel alloy has good characteristics about thermal expansion and oxidation so that exfoliation does not occur. A copper alloy has good characteristics in its electric conductivity and heat conduction so that high-speed signal can be transferred through it.