Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Tetsuyuki Hirashima0
Keiji Takai0
Date of Patent
August 23, 2011
0Patent Application Number
115013250
Date Filed
August 9, 2006
0Patent Primary Examiner
Patent abstract
A method of manufacturing a semiconductor device 28 in which a plating mask 38, 39 having a noble metal plating layer 35 as an uppermost layer is formed at a predetermined portion on an obverse surface side or a reverse surface side of a leadframe material 10, and the leadframe material 10 is consecutively subjected to etching by using the plating mask 38, 39 as a resist mask, so as to form external connection terminal portions 22 which electrically communicate with a semiconductor element 18 disposed in an interior of an encapsulating resin 21, and which project downwardly. Base metal plating or noble metal plating 33 exhibiting etching solution resistance is provided as a lowermost layer of the plating mask 38, 39.
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