LEAD FRAME HAVING CONDUCTIVE LAYER

摘要

PURPOSE: A lead frame having a conductive layer is provided to improve not only the mechanical characteristics but also the thermal characteristics of the lead frame. CONSTITUTION: The lead frame includes internal leads(110), outer leads(120), and a conductive layer(134). The outer leads are formed inside of the internal leads as a whole. The leads are formed of ironic alloys. The conductive layer is formed into a predetermined depth from the surface of the leads to improve the electrical characteristics of the leads. The predetermined depth is a surface depth(t) applied for a surface effect of high frequency transmission. The surface of the conductive layer is treated by a surface-treatment with de-oxidation chemicals.