| 摘要 |
PURPOSE:To improve bonding characteristic with Au lead, hardness and bending characteristic by specifying the size and distribution of deposited material containing Cr and Zr. CONSTITUTION:A lead frame is formed by Cu alloy which contains Cr of 0.1- 1wt% and Zr of 0.05-0.5wt% with deposition size of 0.5-50mum and distribution of 1,000-10,000pcs/mm.<2>. The Cu alloy also contains one or more kinds selected from Mg, Si, Sn, Ni, Fe, Zn, P in addition to Cr and Zr in total amount of 1wt% or less. Thereby, the bonding characteristic to Au lead, hardness and bending characteristic can be improved. |
