公开(公告)号：US20130286621A1

公开(公告)日：2013-10-31

申请号：US13924210

申请日：2013-06-21

Applicant: Renesas Electronics Corporation

Inventor： Hanae SHIMOKAWA ,  Tasao SOGA ,  Hiroaki OKUDAIRA ,  Toshiharu ISHIDA ,  Tetsuya NAKATSUKA ,  Yoshiharu INABA ,  Asao NISHIMURA

IPC: H05K1/18

CPC classification number: H05K1/181 ,  B23K1/0016 ,  B23K35/004 ,  B23K35/007 ,  B23K35/262 ,  B23K2101/40 ,  H01L23/488 ,  H01L23/49811 ,  H01L23/532 ,  H01L24/29 ,  H01L2224/83101 ,  H01L2924/01322 ,  H01L2924/15747 ,  H05K3/3426 ,  H05K3/3463 ,  H05K2201/10909 ,  Y02P70/613 ,  Y10T29/49144 ,  Y10T29/49149 ,  Y10T29/49169 ,  Y10T428/12708 ,  Y10T428/12715 ,  H01L2924/00

Abstract: Provided are a bonded structure by a lead-free solder and an electronic article comprising the bonded structure. The bonded structure has a stable bonding interface with respect to a change in process of time, an enough strength and resistance to occurrence of whiskers while keeping good wettability of the solder. In the bonded structure, a lead-free Sn—Ag—Bi alloy solder is applied to an electrode through an Sn—Bi alloy layer. The Sn—Bi alloy, preferably, comprises 1 to 20 wt % Bi in order to obtain good wettability of the solder. In order to obtain desirable bonding characteristics having higher reliability in the invention, a copper layer is provided under the Sn—Bi alloy layer thereby obtaining an enough bonding strength.

Abstract translation: 提供通过无铅焊料的接合结构和包含接合结构的电子制品。 粘合结构相对于时间的变化具有稳定的结合界面，足够的强度和耐发生晶须同时保持焊料的良好润湿性。 在接合结构中，通过Sn-Bi合金层将无铅Sn-Ag-Bi合金焊料施加到电极。 Sn-Bi合金优选含有1〜20重量％的Bi，以获得良好的焊料润湿性。 为了获得本发明中具有较高可靠性的理想的接合特性，在Sn-Bi合金层下方设置有铜层，从而获得足够的接合强度。