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    • 35. 发明授权
    • Method of controlling solder ball size of BGA IC components
    • 控制BGA IC元件焊球尺寸的方法
    • US5519580A
    • 1996-05-21
    • US303440
    • 1994-09-09
    • Siva NatarajanDebendra Mallik
    • Siva NatarajanDebendra Mallik
    • H01L23/498H05K1/02H05K1/11H05K3/34H05K7/02
    • H05K3/3436H01L23/49816H05K1/111H05K1/114H01L2924/0002H05K1/0201H05K2201/062H05K2201/09381H05K2201/0989H05K2201/10734H05K2201/10969H05K3/3452Y02P70/611Y02P70/613
    • A ball grid array (BGA) package which has a plurality of solder balls attached to solder landings that each have a number of tabs which extend from a center area of the landing. The tabs assist in a symmetric formation of solder balls that are formed on the landings. When constructing the package, a solder mask is applied to a bottom package surface before the application of the solder balls. The solder mask has a plurality of openings which expose the solder landings and are larger than the center area of the landings. Solder balls are then placed onto the solder landings and reflowed so that the balls become attached to the landings. The fully exposed center areas of the solder landings allow the solder to flow vertically along the outer walls of the landings, thereby providing a more robust solder joint. The exposed solder landings also allow a solder flux to be thoroughly cleaned after the solder balls are attached to the landings. Additionally, the land tabs insure an even solder flow about the solder landings to produce a symmetric uniform solder balls.
    • 一种球栅阵列(BGA)封装,其具有附接到焊接着陆点的多个焊球,每个焊球均具有从层站的中心区域延伸的多个突片。 凸片有助于形成在平台上的焊球对称地形成。 当构造封装时,在施加焊球之前,将焊接掩模施加到底部封装表面。 焊接掩模具有多个露出焊接着陆的开口,并且大于平台的中心区域。 然后将焊球放置在焊接层上并回流,使得球附着到平台上。 焊接着陆的完全暴露的中心区域允许焊料沿着平台的外壁垂直流动,从而提供更坚固的焊点。 暴露的焊接着陆还允许在焊球附接到着陆点之后彻底清洁焊剂。 另外,焊盘可以确保焊料平齐地焊接在焊盘上,以产生对称均匀的焊球。