| 摘要 |
PURPOSE:To eliminate cracks of a resin from a triangular conical part of lower four corners of a chip placing tab by forming a structure that the lower triangular conical part of the tap is treated to become obtuse angle to reduce the thermal stress of the resin applied to the conical part. CONSTITUTION:A tap lead is composed by punching a metal plate to be formed in the lead perpendicularly with respect to the surface of the plate, forming a predetermined chip placing part, mechanically polishing the triangular conical part of lower four corners of a chip plating tab 1 to form a bent part 8, then placing a chip 3 on the tab 1, electrically connecting a lead frame 2 with an electrode on the chip with fine metal wirings 4, and sealing it with resin 5. The thermal stress applied to the bent part 8 of lower four corners of the tap is reduced in solder dipping step to eliminate cracks of the resin from the bent part.
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