Semiconductor chip assemblies and methods of making same
First Claim
1. A method of assembling a semiconductor chip comprising the steps of:
- (a) assembling a flexible sheetlike dielectric interposer formed separately from the chip and having first and second surfaces to the chip so that a first surface of said interposer confronts a front surface of said chip, so that said first surface of said interposer bears on said front surface of said chip and so that a portion of said interposer overlies a contact pattern area encompassed by a pattern of contacts on the front surface of said chip; and
(b) connecting the contacts on said chip to terminals disposed on the second surface of said interposer within an area of said interposer overlying said contact pattern area by means of flexible leads so that such leads extend between the contacts and terminals through apertures in said interposer and so that each such terminal is moveable with respect to the associated contact.
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Accused Products
Abstract
A semiconductor chip assembly is mounted to contact pads in a compact area array. An interposer is disposed between the chip and the substrate. The contacts on the chip are connected to terminals on the interposer by flexible leads extending through apertures in the interposer. The terminals on the interposer in turn are bonded to the contact pads on the substrate. Flexibility of the leads permits relative movement of the contacts on the chip relative to the terminals and the contact pads of the substrate and hence relieves the stresses caused by differential thermal expansion. The arrangement provides a compact structure similar to that achieved through flip-chip bonding, but with markedly increased resistance to thermal cycling damage.
280 Citations
21 Claims
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1. A method of assembling a semiconductor chip comprising the steps of:
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(a) assembling a flexible sheetlike dielectric interposer formed separately from the chip and having first and second surfaces to the chip so that a first surface of said interposer confronts a front surface of said chip, so that said first surface of said interposer bears on said front surface of said chip and so that a portion of said interposer overlies a contact pattern area encompassed by a pattern of contacts on the front surface of said chip; and (b) connecting the contacts on said chip to terminals disposed on the second surface of said interposer within an area of said interposer overlying said contact pattern area by means of flexible leads so that such leads extend between the contacts and terminals through apertures in said interposer and so that each such terminal is moveable with respect to the associated contact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of making a semiconductor connection component comprising the steps of:
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(a) providing a sheetlike dielectric interposer having first and second surface and a plurality of apertures extending between said surfaces; (b) laminating a conductive sheet to said second surface of said interposer, so that a first surface of said sheet confronts said second surface of said interposer and so that said sheet overlies said apertures; (c) forming a resist pattern on a second surface of said sheet facing away from said interposer, said resist pattern including lead areas at least partially aligned with said apertures and terminal areas contiguous with said lead areas but not aligned with said apertures; (d) applying a resist to the first surface of said conductive sheet in said apertures; (e) contacting said conductive sheet with an etchant so that said etchant removes said conductive sheet except in said lead areas and said terminal ares; and (f) removing said resists. - View Dependent Claims (21)
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Specification