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    • 51. 发明授权
    • Molded pin grid array package GPT
    • 模压针阵列封装GPT
    • US4688152A
    • 1987-08-18
    • US895395
    • 1986-08-11
    • Chok J. Chia
    • Chok J. Chia
    • H01L23/498H05K7/06
    • H01L23/49827H01L2224/48091Y10T29/49146
    • A pin-grid package is created by starting with printed wiring boards that have plated through holes that can accommodate wire pins. Pins are secured in position to extend outward from one face of the PW board in the form of a pin grid array of the desired configuration which is typically a plurality of concentric rings thereby creating a square grid pattern of predetermined spacing. The opposing PW board face includes a central pin-free area to which is secured a semiconductor die. This face of the PW board includes a plurality of wiring traces that connect each pin to an array that surrounds the semiconductor die. The traces are connected to the bonding pads of the semiconductor die by either wire bonds or a spider assembly using tape assembly bonding. The PW board is located in a mold that has a flat faced first platen that contains cut-out regions that will accommodate the package pins. The other flat-faced mold platen contains molding cavities that are in registry with and slightly larger than the PW boards. The mold cavities include a series of ribs that are distributed around the cavity periphery. These ribs bear against the PW board when the mold is assembled so that the PW board is centered and pressed against the flat face of first platen in the region outboard of the pin-grid pattern. When a liquified plastic encapsulant is forced into the mold the cavities will be filled and the liquid will be excluded from the pin side of the PW board.
    • 通过从具有电镀通孔的印刷电路板开始,可以容纳线引脚,从而创建一个针格栅封装。 引脚被固定就位,从PW板的一个面向外延伸,形式为通常是多个同心环的所需结构的销栅格阵列形式,从而产生预定间隔的正方形网格图案。 相对的PW板面包括固定半导体管芯的中心无引脚区域。 PW板的该面包括将每个引脚连接到围绕半导体管芯的阵列的多个布线迹线。 迹线通过线接合或者使用带组件接合的蜘蛛组件连接到半导体管芯的接合焊盘。 PW板位于模具中,该模具具有平坦的第一压板,其包含将容纳封装销的切口区域。 另一个平面模具压板包含与PW板对准并略大的模制腔。 模腔包括分布在腔周边周围的一系列肋。 当模具组装时,这些肋承载在PW板上,使得PW板在针脚格栅图案外侧的区域中心并压靠在第一压板的平面上。 当液态塑料密封剂被迫进入模具时,空腔将被填充,并且液体将从PW板的销侧排除。