Patent ID: 8581357
Filing Date: 2013-11-12
Classification: B81B,B81C,G01J,H01L

Abstract:
1. A method of producing a plurality of packages each comprising an electrical circuit, the method comprising: providing a wafer comprising a plurality of electrical circuits; testing the plurality of electrical circuits for their functionality so as to obtain an identification of functional electrical circuits and dysfunctional electrical circuits among the plurality of electrical circuits; selecting a subset of the plurality of electrical circuits, the subset including at least one of the functional electrical circuits, according to the identification of functional electrical circuits and dysfunctional electrical circuits; respectively producing, for the subset of the plurality of electrical circuits, a first frame, which encloses the at least one functional electrical circuit, on a surface of the wafer; individually connecting, by use of a flip-chip bonder, and for the subset of the plurality of electrical circuits, a lid comprising a second frame, which is adapted to the first frame, on a surface of the lid, to the wafer so that the first frame and the second frame lie on top of each other so as to package the at least one functional electrical circuit, wherein the step of individually connecting is not performed on, and leaves unpackaged, any electrical circuit of the plurality of electrical circuits not included in the subset of the plurality of electrical circuits; and singulating the plurality of electrical circuits by separating the wafer along singulation lines which do not intersect any of circumferences of the lids so as to yield a plurality of packages comprising the functional electrical circuits; wherein the step of respectively producing the first frame includes: producing a first frame portion from a first metal; and producing a second frame portion from a second metal on the first frame portion, the first and second metals selected such that a first melting temperature of an alloy formed from the first and second metals is higher than a second melting temperature of the second metal.